NC0043532_Application (ATC) Package_20190905

616 Colonnade Drive 
Charlotte, NC 28205 
Tel. [phone] 
www.wkdickson.com Aviation    Water Resources    Urban Development    Geomatics 

September 5, 2019 

Ms. Julie Grzyb 
Supervisor 
NC NPDES Permitting   
NC Department of Environmental Quality 
1617 Mail Service Center 
Raleigh, NC 27669‐1617 

RE: West Stanly Wastewater Treatment Plant Sanitary Sewer Improvements SRF#CS370834‐04 
 Application for Authorization to Construct Permit 
 WK Dickson Project No. 20170316.00.CL 

Dear Ms. Grzyb: 

I am pleased to submit the Final Design Package for the West Stanly WWTP Sanitary Sewer 
Improvements SRF # CS370834‐04, for the Division’s review and comment.  Currently the West Stanly 
WWTP operates under NPDES permit number NC0043532.  This project includes improvements of 
the McCoy Creek Pump Station, new headworks facility, the replacement of aerating and mixing 
equipment in aeration basin, the removal of two 25’ diameter secondary clarifiers and replacement 
with one 75’ diameter secondary clarifier, the removal and replacement of RAS pump station, 
modifications to the chlorine contact chamber, modifications to existing yard hydrant pump house, 
modifications to plant drain pump station, and modifications to effluent pump station.  The 
construction phase of the project is expected to take 12 months to complete.   

This package is being submitted in accordance with the Bid and Design Document Submittal 
Checklist and the Application for Authorization to Construct.  Included in this submittal package is: 

 one (1) complete set (as hard copies) of the sealed plans, specifications, and engineering 
calculations 
 one (1) complete set (as a digital copy) of the sealed plans, specifications, and engineering 
calculations 
 Signed Authorization to Construct Permit Application 
 Existing NPDES Permit 
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 1  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

 SECTION 1: INSTRUCTIONS AND INFORMATION 
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the 
application is complete. Failure to submit all of the required items will result in the application package being returned as incomplete 
per 15A NCAC 02T .0105(b). 
B. Plans and specifications must be prepared in accordance with 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 
133‐3, North  Carolina  General  Statute  143‐215.1,  and Division  of  Water  Resources  Minimum  Design  Criteria  for  NPDES 
Wastewater Treatment Facilities.   
C. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.  
D. Any content changes made to this Form ATC‐12‐14 shall result in the application package being returned.   
E. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation and 
attachments. All information must be submitted bound or in a 3‐ring binder, with a Section tab for each Section, except the 
Engineering Plans. 
F. Check the boxes below to indicate that the information is provided and the requirements are met. 
G.  If attachments are necessary for clarity or due to space limitations, such attachments are considered part of the application 
package and must be numbered to correspond to the item referenced. 
H. For any project that requires review under the State Environmental Policy Act (SEPA), an Authorization to Construct cannot be 
issued prior to the completion of a State Clearinghouse advertisement period for a FONSI, EIS, etc. unless the project qualifies for 
a Determination of Minor Construction Activity. 
I. For more information, visit the Division of Water Resources web site at: https://deq.nc.gov/about/divisions/water‐resources/water‐
resources‐permits/wastewater‐branch/npdes‐wastewater/authorization‐to‐construct.  
J. In addition to this Authorization to Construct, the Applicant should be aware that other permits may be required from other Sections 
of the Division of Water Resources (for example: reclaimed water facilities permits; Class A or B biosolids residuals permit).  

SECTION 2: APPLICANT INFORMATION AND PROJECT DESCRIPTION 

A. APPLICANT  
Applicant’s name  Stanly County 
Signature authority’s name per 15A NCAC 02T .0106(b)  Andy Lucas 
Signature authority’s title  County Manager 
Complete mailing address  1000 N. First Street, Suite 12, Albemarle, North Carolina 28001 
Telephone number  (704) 986‐3686 
Email address  [e-mail] 

B. PROFESSIONAL ENGINEER  
Professional Engineer’s name  James W Holland 
Professional Engineer’s title  Project Manager 
North Carolina Professional Engineer’s License No.   33716 
Firm name  WK Dickson & Co., Inc. 
Firm License number  F‐0374 
Complete mailing address  616 Colonnade Dr., Charlotte, NC 28205 
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 2  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

Telephone number  (704) 334‐5348 
Email address  [e-mail] 
C. NPDES PERMIT  
NPDES Permit number  NC0043532 
Current Permitted flow (MGD) – include permit 
flow phases if applicable 0.9 MGD, 1.2 MGD upon completion of construction 

D. PROJECT DESCRIPTION 
Provide a brief description of the project: This project will move to expand plant process to handle higher surge flows, as well as 
improve the processes for ease of operation. New aeration units will be placed in the aeration basins to replace the current 
mechanical mixers. The proposed floating aeration units will include separate submersible mixing and blower assemblies to 
provide greater operator control of the aeration process. The headworks assembly will be relocated from the McCoy Creek 
Pump Station to the Plant site, this will allow the operators to have more daily oversight of the primary treatment. Two 
currently abandoned 25‐foot secondary clarifiers will be demolished and replaced with a single 75‐foot clarifier, which will run 
simultaneously with the current 50’ clarifier. This will provide redundancy as well as increase capacity. The chlorine contact 
chamber will be expanded for capacity and split into two separate trains to allow easier access for cleaning. The disinfection and 
dichlorination system will be replaced and relocated to separate building from the lab office, closer to the chlorine contact 
chamber. The effluent will be upgraded to increase capacity. With the increase in sludge, the RAS pump station will be replaced, 
and new force main will be installed to be able to pull from each clarifier independently. Finally, the increase in water demand 
from the headworks unit and additional yard hydrants will be met installing a new non‐potable plant water system, originating 
from the effluent wet well. Perform Work of Contract under stipulated sum contract with Owner in accordance with Conditions 
of Contract. 

SECTION 3: APPLICATION ITEMS REQUIRED FOR SUBMITTAL FOR ALL PROJECTS 
A. Cover Letter  
  The letter must include a request for the Authorization to Construct; the facility NPDES Number; a brief project description 
that indicates whether the project is a new facility, facility modification, treatment process modification, or facility expansion; 
the construction timeline; and a list of all items and attachments included in the application package. 
  If any of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 133‐3, North Carolina 
General Statute 143‐215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment 
Facilities are not met by the proposed design, the letter must include an itemized list of the requirements that are not met.  
B. NPDES Permit  
  Submit Part I of the Final NPDES permit for this facility that includes Part A (Effluent Limitations and Monitoring Requirements) 
for the monthly average flow limit that corresponds to the work that is requested for this project. 
C. Special Order by Consent  
  If the facility is subject to any Special Orders by Consent (SOC), submit the applicable SOC. 
  Not Applicable. 
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 3  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

D. Finding of No Significant Impact or Record of Decision 
  Submit a copy of the Finding of No Significant Impact or Record of Decision for this project. 
 Provide a brief description of any of the mitigating factors or activities included in the approved Environmental Document 
that impact any aspect of design of this project, if not specified in the Finding of No Significant Impact or Record of Decision. 
  ___________________________________________________________________________________________   
             ___ 
  Not Applicable. 
E. Engineering Plans 
 Per 15A NCAC 02T .0504(c)(1), submit one set of detailed plans that have been signed, sealed and dated by a North Carolina 
Licensed Professional Engineer. 
 Per 21 NCAC 56 .1103(a)(6), the name, address and License number of the Licensee’s firm shall be included on each sheet of 
the engineering drawings. 
    Plans must be labeled as follows: FINAL DRAWING – FOR REVIEW PURPOSES ONLY – NOT RELEASED FOR CONSTRUCTION.  
 15A NCAC 02H .0124 requires multiple (dual at a minimum) components such as pumps, chemical feed systems, aeration 
equipment  and disinfection equipment.  Is  this  requirement  met by  the  design?  Yes or  No.    If no,  provide  an 
explanation:     _____________________________              ___       ____                                                                                      ____ 
Plans shall include: 
  Plans for all applicable disciplines needed for bidding and construction of the proposed project (check as appropriate): 
   Civil       Not Applicable 
  Process Mechanical     Not Applicable 
  Structural      Not Applicable 
  Electrical      Not Applicable 
  Instrumentation/Controls  Not Applicable 
  Architectural     Not Applicable 
   Building Mechanical    Not Applicable 
   Building Plumbing    Not Applicable 
  Plan and profile views and associated details of all modified treatment units including piping, valves, and equipment (pumps, 
blowers, mixers, diffusers, etc.) 
  Are any modifications proposed that impact the hydraulic profile of the treatment facility?  Yes or  No.  If yes, provide 
a hydraulic profile drawing on one sheet that includes all impacted upstream and downstream units.  The profile shall include 
the top of wall elevations of each impacted treatment unit and the water surface elevations within each impacted treatment 
unit for two flow conditions: (1) the NPDES permitted flow with all trains in service and (2) the peak hourly flow with one 
treatment train removed from service.   
  Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility? 
 Yes or  No.  If yes, provide the process flow diagram or process flow schematic showing all modified flow paths including 
aeration, recycle/return, wasting, and chemical feed, with the location of all monitoring and control instruments noted. 
F.  Engineering Specifications  
 Per 15A NCAC 02T .0504(c)(2), submit one set of specifications that have been signed, sealed and dated by a North Carolina 
Licensed Professional Engineer.   
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 4  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

  Specifications must be labeled as follows: FINAL SPECIFICATIONS – FOR REVIEW PURPOSES ONLY – NOT RELEASED FOR 
CONSTRUCTION.   
Specifications shall include: 
  Specifications  for  all  applicable  disciplines  needed  for  bidding  and  construction  of  the  proposed  project  (check  as 
appropriate): 
   Civil       Not Applicable 
  Process Mechanical     Not Applicable 
  Structural      Not Applicable 
  Electrical      Not Applicable 
  Instrumentation/Controls  Not Applicable 
  Architectural     Not Applicable 
   Building Mechanical    Not Applicable 
   Building Plumbing    Not Applicable 
  Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers, 
diffusers, etc.), and instrumentation. 
  Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and 
pipelines, and performance testing requirements for equipment. 
  Bid Form for publicly bid projects.  
G. Construction Sequence Plan 
  Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.  
The Plan must not imply that the Contractor is responsible for operation of treatment facilities. List the location of the 
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both: Page C.1 of drawings 
H. Engineering Calculations  
 Per 15A NCAC 02T .0504(c)(3), submit one set of engineering calculations that have been signed, sealed and dated by a North 
Carolina Licensed Professional Engineer; the seal, signature and date shall be placed on the cover sheet of the calculations.  
For new or expanding facilities and for treatment process modifications that are included in Section 4.C, the calculations shall 
include at a minimum: 
  Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.  
  Influent  pollutant  loading  demonstrating  how  the  design  influent  characteristics  in  Section  4.B.2  of  this  form  were 
determined. 
  Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.B.2 of this form 
were determined. 
  Hydraulic loading for each treatment unit. 
  Sizing criteria for each treatment unit and associated equipment (blowers, mixers, pumps, etc.) 
  Total dynamic head (TDH) calculations and system curve analysis for each pump specified that is included in Section 4.C.6.  
  Buoyancy calculations for all below grade structures. 
  Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units. 
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 5  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

I. Permits 
  Provide the following information for each permit and/or certification required for this project: 
Permit/Certification 
Not 
Applicable 
Date 
Submitted 
Date 
Approved 
Permit/ 
Certification 
Number 
If Not Issued Provide 
Status and Expected 
Issuance Date 
Dam Safety X                             
Soil Erosion and Sediment Control X                             
USCOE  / Section 404 Permit X                             
Water Quality Certification (401) X                             
USCOE / Section 10 X                             
Stormwater Management Plan X                             
CAMA X                             
NCDOT Encroachment Agreement  X                             
Railroad Encroachment Agreement  X                             
Other:        X                             
J. Residuals Management Plan  
  For all new facilities, expanding facilities, or modifications that result in a change to sludge production and/or sludge 
processes, provide a Residuals Management Plan meeting the requirements of 15A NCAC 02T .0504(j) and 15A NCAC 02T 
.0508; the Plan must include: 
  A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected, handled, 
processed, stored, treated, and disposed. 
  An evaluation of the treatment facility’s residuals storage requirements based upon the maximum anticipated residuals 
production rate and ability to remove residuals.   
  A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved 
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a 
residuals/utilization program application.      
  If oil, grease, grit or screenings removal and collection is a designated unit process, a detailed explanation as to how the 
oil/grease will be collected, handled, processed, stored and disposed.  
 Not Applicable.  

                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 6  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

SECTION 4: PROJECT INFORMATION  
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION – COMPLETE FOR NEW OR EXPANDING FACILITIES 
1. Provide the following flow information:  
Plant Flows 
Existing Plant Design  0.9 MGD 
Current NPDES Permit Limit 0.9 MGD 
Current Annual Average 
(past 12 months) 0.445 MGD 

For Past 12 Months: 
Start Date: 01/18 
End Date: 12/18 
For Past 24 Months: 
Start Date: 01/17 
End Date: 12/18 
Maximum Month   0.666 MGD  0.666 MGD 
Maximum Day  2.037 MGD  2.409 MGD 
Peak Hour   4.94 MGD  5.82 MGD 

                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 7  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

B. WASTEWATER TREATMENT FACILITY DESIGN INFORMATION – COMPLETE FOR NEW OR EXPANDING FACILITIES AND 
FOR TREATMENT PROCESS MODIFICATIONS 
1. Have all of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 133‐3, North Carolina 
General Statute 143‐215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment 
Facilities been met by the proposed design and specifications?  Yes or  No.  If no, provide justification as to why the 
requirements are not met, consistent with 15A NCAC 02T .0105(n):   _                                                            _______________              
___       _                                                                                                                                                                                                    ___ 
2. Provide the design influent and effluent characteristics that are used as the basis for the project design, and the NPDES 
permit limits for the following parameters:  
Parameter 
Influent 
Concentration ‐ 
Current Annual 
Average (past 
12 months) if 
Available 
Project Basis of Design 
NPDES Permit Limits 
(monthly average) 
Design Influent 
Concentration 
(Must be 
supported by 
Engineering 
Calculations 
[Section 3.H]) 
Design Influent 
Load  
(Must be 
supported by 
Engineering 
Calculations 
[Section 3.H]) 
Design Effluent 
Concentration and/or 
Load 
Ammonia Nitrogen 
(NH3‐N) 35.3 mg/L  40 mg/L  400 lb/day  4.0 mg/L  4.0 mg/L 
Biochemical 
Oxygen Demand 
(BOD5) 
168 mg/L  250 mg/L  2500 lb/day  10.0 mg/L  10.0 mg/L 
Fecal Coliform     200 per 100 mL 200 per 100 mL 
Nitrate + Nitrite 
Nitrogen (NO3‐N + 
NO2‐N) 
   ‐ mg/L ‐ mg/L 
Total Kjeldahl 
Nitrogen N/A mg/L     
Total Nitrogen    
‐ mg/L ‐ mg/L
‐ lb/year ‐ lb/year
Total Phosphorus  N/A mg/L  12 mg/L  120 lb/day 
‐ mg/L ‐ mg/L
‐ lb/year ‐ lb/year
Total Suspended 
Solids (TSS) 181 mg/L  250 mg/L  2500 lb/day  30.0 mg/L 30.0 mg/L 
3. Based on the “Project Basis of Design” parameters listed above, will the proposed design allow the treatment facility to 
meet the NPDES Permit Limits listed above?  Yes or  No.    If no, describe how and why the Permit Limits will not be 
met:                                                                                                                                                                                                                  
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 8  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

4. Per 15A NCAC 02T .0505(j), by‐pass and overflow lines are prohibited.  Is this condition met by the design?  Yes or  No    
If no, describe the treatment units bypassed, why this is necessary, and where the bypass discharges:                                       
5. Per 15A NCAC 02T .0505(k), multiple pumps shall be provided wherever pumps are used. Is this condition met by the 
design?  Yes or  No.  If no, provide an explanation:                                                                                                                       
6. Per 15A NCAC 02T .0505(l), power reliability shall be provided consisting of automatically activated standby power supply 
onsite capable of powering all essential treatment units under design conditions, or dual power supply shall be provided 
per 15A NCAC 02H. 0124(2)(a). Is this condition met by the design?         Yes or  No.  If no, provide (as an attachment 
to this Application) written approval from the Director that the facility: 
 Has a private water supply that automatically shuts off during power failures and does not contain elevated water 
storage tanks, and  
 Has sufficient storage capacity that no potential for overflow exists, and 
 Can tolerate septic wastewater due to prolonged detention. 
7. Per 15A NCAC 02T .0505(o), a minimum of 30 days of residual storage shall be provided.  Is this condition met by the 
design?   Yes or  No.  If no, explain the alternative design  criteria proposed for this project in accordance 15A NCAC 
02T .105(n): The technology used to process wasted activated sludge is not changing and the existing residual storage will 
be maintained throughout and after this project.   
8. Per 15A NCAC 02T .0505(q), the public shall be prohibited from access to the wastewater treatment facilities. Explain how 
the design complies with this requirement: Facility enclosed within a security fence. 
9. Is the treatment facility located within the 100‐year flood plain?   Yes or  No.  If yes, describe how the facility is 
protected from the 100‐year flood:   _                                                __________________                                                            
C. WASTEWATER TREATMENT UNIT AND MECHANICAL EQUIPMENT INFORMATION – COMPLETE FOR NEW OR 
EXPANDING FACILITIES AND FOR MODIFIED TREATMENT UNITS 
1. PRELIMINARY AND PRIMARY TREATMENT (i.e., physical removal operations and flow equalization): 
Treatment Unit No. of 
Units Type  Size per Unit 
Plan Sheet 
Reference 
Specification 
Reference 
Calculations 
Provided? 
(Yes or No) 
Manual Bar Screen  N/A   MGD at peak hourly flow      
Mechanical Bar 
Screen 1 Cylindrical 
Rotating Rake 9.0 MGD at peak hourly flow  C.6/C.7  46 21 33 

Grit Removal   1  Shafted Screw  9.0 MGD at peak hourly flow   C.6/C.7  46 21 33 

Flow Equalization  N/A 
‐‐  gallons      
Primary Clarifier  N/A  Circular  ft diameter;   ft side 
water depth      
Primary Clarifier  N/A  Rectangular 
 square feet;   ft side 
water depth      
Other  N/A   

                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 9  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

2. SECONDARY TREATMENT (BIOLOGICAL REACTORS AND CLARIFIERS) (i.e., biological and chemical processes to remove 
organics and nutrients) 
Treatment Unit No. of 
Units Type  Size per Unit 
Plan Sheet 
Reference 
Specification 
Reference 
Calculations 
Provided? 
(Yes or No) 
Aerobic Zones/ 
Tanks N/A     gallons      
Anoxic Zones/ 
Tanks N/A     gallons     
Anaerobic 
Zones/Tanks N/A     gallons     
Sequencing Batch 
Reactor (SBR) N/A  ‐‐  gallons     
Membrane 
Bioreactor (MBR) N/A  ‐‐  gallons     
Secondary Clarifier  1  Circular 
75 ft diameter; 14 ft side 
water depth C.13/C.14  46 43 21  Yes 
Secondary Clarifier  N/A  Rectangular 
 square feet;   ft 
side water depth      
Other  N/A        

3. TERTIARY TREATMENT  
Treatment Unit No. of 
Units Type  Size per Unit 
Plan Sheet 
Reference 
Specification 
Reference 
Calculations 
Provided? 
(Yes or No) 
Tertiary Clarifier  N/A  Circular  ft diameter;   ft 
side water depth      
Tertiary Clarifier  N/A  Rectangular 
 square feet;   ft 
side water depth      
Tertiary Filter  N/A   square feet      
Tertiary Membrane 
Filtration N/A     square feet      
Post‐Treatment 
Flow Equalization N/A  ‐‐   gallons      
Post‐Aeration  N/A     gallons      
Other  N/A        
4. DISINFECTION 
Treatment Unit No. of 
Units Type  Size per Unit 
Plan Sheet 
Reference 
Specification 
Reference 
Calculations 
Provided? 
(Yes or No) 
Ultraviolet Light  N/A 

(Parallel; in 
series) 
 gal/day per bank at 
peak hourly flow;   
number of banks;   
number of lamps/bank 

Chlorination  2 
Gas (Gas; 
tablet; liquid) 
22,721 gallons of contact 
tank/unit C.19‐C.21  46 31 11 
Yes 
                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 10  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

Dechlorination  1 
Gas (Gas; 
tablet; liquid) 
803 gallons of contact 
tank/unit C.19‐C.21  46 31 11 
Yes 

5. RESIDUALS TREATMENT 
Treatment Unit No. of 
Units Type  Size per Unit 
Plan Sheet 
Reference 
Specification 
Reference 
Calculations 
Provided? 
(Yes or No) 
Gravity Thickening 
Tank N/A     square feet;   ft side 
water depth      
Mechanical 
Thickening/ 
Dewatering 
N/A     dry lb/hour     

Aerobic Digestion  N/A     gallons      
Anaerobic 
Digestion N/A     gallons      
Composting  N/A     dry lb/hour      
Drying  N/A     dry lb/hour      
Other  N/A          
6. PUMP SYSTEMS (include influent, intermediate, effluent, major recycles, waste sludge, thickened waste sludge and plant 
drain pumps) 
Location No. of 
Pumps Purpose  Type 
Capacity of 
each pump Plan Sheet 
Reference 
Specification 
Reference GPM  TDH 
RAS Pump Station  3  RAS  Suction Lift  625  37  C.17  46 07 83 
Effluent Pump 
Station 3  Effluent FM  Vertical Turbine  1500  295  C.22  43 21 49 
Effluent Pump 
Station 1  Plant Water Service  Vertical Turbine  96  440  C.22  43 21 49 

7. MIXERS 
Location No. of 
Mixers Purpose  Type 
Power of 
each Mixer 
(HP) 
Plan Sheet 
Reference 
Specification 
Reference 
Aeration Basin  8  Mixing/Aeration 
Floating 
Aerator/Mixer 10  C.10/C.11  46 41 26 

                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 11  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

8. BLOWERS 
Location No. of 
Blowers Purpose  Type 
Capacity of 
each Blower 
(CFM) 
Plan Sheet 
Reference 
Specification 
Reference 
Aeration Basin  8  Mixing/Aeration  Floating  7  C.10/C.11  46 41 26 

9. ODOR CONTROL 
Location No. of 
Units Purpose  Type 
Plan Sheet 
Reference 
Specification 
Reference 
N/A           

D. SETBACKS – COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES 
1. The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T .0506(b) 
are as follows: 
Setback Parameter 
Minimum Distance 
Required from Nearest 
Treatment/Storage 
Unit 
Is Minimum Distance 
Requirement met by the 
Design? If “No”, identify 
Setback Waivers in Item D.2 
Below 
Any habitable residence or place of assembly under separate 
ownership or not to be maintained as part of the project site 100 ft  Yes  No 
Any private or public water supply source  100 ft  Yes  No
Surface waters (streams – intermittent and perennial, perennial 
waterbodies, and wetlands) 50 ft  Yes  No
Any well with exception of monitoring wells  100 ft  Yes  No
Any property line  50 ft  Yes  No
2. Have any setback waivers been obtained per 15A NCAC 02T .0506(d)?  Yes or  No.  If yes, have these waivers been 
written, notarized and signed by all parties involved and recorded with the County Register of Deeds?  Yes or  No.  If 
no, provide an explanation:  

                       APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC‐12‐14)  

Application for Authorization to Construct Permit (FORM ATC‐12‐14)     Page 12  

State of North Carolina 
Department of Environmental Quality 
Division of Water Resources 

SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER 
Professional Engineer's Certification per 15A NCAC 02T .0105: 
I, James W. Holland, P.E., attest that this application package for an Authorization to Construct 
     (Typed Name of Professional Engineer) 
for the West Stanly Wastewater Treatment Plant Sanitary Sewer Improvements SRF # CS370834‐04 
                (Facility and Project Name) 
was prepared under my direct supervisory control and to the best of my knowledge is accurate, complete and consistent 
with the information supplied in the engineering plans, specifications, calculations, and all other supporting 
documentation for this project.  I further attest that to the best of my knowledge the proposed design has been 
prepared in accordance with all applicable regulations and statutes, 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina 
General Statute 133‐3, North Carolina General Statute 143‐215.1, and Division of Water Resources Minimum Design 
Criteria for NPDES Wastewater Treatment Facilities, and this Authorization to Construct Permit Application, except as 
provided for and explained in Section 4.B.1 of this Application. I understand that the Division of Water Resources’ 
issuance of the Authorization to Construct Permit may be based solely upon this Certification and that the Division may 
waive the technical review of the plans, specifications, calculations and other supporting documentation provided in this 
application package. I further understand that the application package may be subject to a future audit by the Division. 
Although certain portions of this submittal package may have been prepared, signed and sealed by other professionals 
licensed in North Carolina, inclusion of these materials under my signature and seal signifies that I have reviewed the 
materials and have determined that the materials are consistent with the project design.  
I understand that in accordance with General Statutes 143‐215.6A and 143‐215.6B, any person who knowingly makes 
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, 
which may include a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation. 
North Carolina Professional Engineer's seal with written signature placed over or adjacent to the seal and dated: 

Form PS‐SUBMITTAL‐05/18        Page 1  

North Carolina Department of Environmental Quality 
Division of Water Infrastructure 
BID AND DESIGN DOCUMENT SUBMITTAL CHECKLIST 
(Form PS‐SUBMITTAL‐05/18) 

SECTION 1: INSTRUCTIONS AND INFORMATION 
A. The Division of Water Infrastructure will accept a submittal package for review only if all of the items are provided and the 
submittal is complete. Failure to submit all of the required items may result in an inability to meet funding deadlines and 
subsequent loss of funding assurance. 
B. The submittal shall include a completed copy of this submittal checklist, one copy of plans and specifications, and all supporting 
documentation and attachments. All supporting information should be submitted bound or placed in a 3‐ring binder. 
C. Check the boxes below to indicate the information is provided and the requirements are met. 
D. Plans and specifications must be prepared in accordance with North Carolina General Statute 133‐3 and North Carolina General 
Statute 143‐215.1.   
E. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.  

SECTION 2: CONTACT INFORMATION  

A. Owner Information  
Owner  Stanly County 
Name of Owner’s Authorized Representative   Andy Lucas 
Title   County Manager 
Complete mailing address  1000 N. First Street, Suite 12, Albemarle, North Carolina 28001 
Telephone number  (704) 986‐3686 
Email address  [e-mail] 

B. Professional Engineer Information  
Professional Engineer’s name  James W Holland 
North Carolina Professional Engineer’s License No.   33716 
Firm name  WK Dickson & Co., Inc. 
Firm License number  F‐0374 
Complete mailing address  616 Colonnade Dr., Charlotte, NC 28205 
Telephone number  (704) 334‐5348 
Email address  [e-mail] 

Form PS‐SUBMITTAL‐05/18        Page 2  

SECTION 3: PROJECT INFORMATION 
A. Project Title 
West Stanly WWTP Improvements 

B. Project Description  
Please provide a full description of the project. This description should be similar or identical to what is imbedded in the 
Summary of Work section of the specifications. Include all changes to the existing system (demolition, rehabilitation, additions, 
etc.): 
This project will move to expand plant process to handle higher surge flows, as well as improve the processes for ease of 
operation. New aeration units will be placed in the aeration basins to replace the current mechanical mixers. The proposed 
floating aeration units will include separate submersible mixing and blower assemblies to provide greater operator control of 
the aeration process. The headworks assembly will be relocated from the McCoy Creek Pump Station to the Plant site, this will 
allow the operators to have more daily oversight of the primary treatment. Two currently abandoned 25‐foot secondary 
clarifiers will be demolished and replaced with a single 75‐foot clarifier, which will run simultaneously with the current 50’ 
clarifier. This will provide redundancy as well as increase capacity. The chlorine contact chamber will be expanded for capacity 
and split into two separate trains to allow easier access for cleaning. The disinfection and dichlorination system will be replaced 
and relocated to separate building from the lab office, closer to the chlorine contact chamber. The effluent will be upgraded to 
increase capacity. With the increase in sludge, the RAS pump station will be replaced, and new force main will be installed to be 
able to pull from each clarifier independently. Finally, the increase in water demand from the headworks unit and additional 
yard hydrants will be met installing a new non‐potable plant water system, originating from the effluent wet well. Perform Work 
of Contract under stipulated sum contract with Owner in accordance with Conditions of Contract. 

 Does the Project design match the Engineering Report/Environmental Information Document (ER/EID) Approval Letter, 
Categorical Exclusion (CE), Finding of No Significant Impact (FONSI), or issued Record of Decision (ROD)?   Yes  No. 
If no, clearly describe any portions of the design that vary from the approved documents and the reasons for the 
differences.  Several modifications were made to the design specified in the ER/EID.  THE ER/EID specified that the grit 
removal system at the McCoy Creek Pump Station would be removed and replace with a hydraulic scour to prevent solids 
from settling.  The design presented with this application calls for leaving the grit removal in place.  The ER/EID also 
recommends the implementation of an MLE process in the aeration basin.  The MLE Process requires anoxic and aerobic 
zones within the aeration basin.  The new aerating and mixing equipment that is being installed will allow for the 
independent aeration and mixing which could be used to establish anoxic and aerobic zones.  This flexibility will allow the 
operator to implement which conditions will be best for the biological treatment of the wastewater.   
The ER/EID state that in‐house modification would be made to the chlorine contact basin, however the needed 
modifications will require skilled labor outside the skill set of the operators.  These modifications include concrete work to 
change the internal configuration of the basin creating two parallel trains, moving chlorine and dechlorination feed points 
thus increasing chlorine contant time while still maintaining the required dechlorination contact time.   
Note: based upon the scope of differences, an Amendment to the ER/EID or CE, FONSI, or ROD may be required. 

Form PS‐SUBMITTAL‐05/18        Page 3  

SECTION 4: INFORMATION REQUIRED FOR ALL PROJECT TYPES 

A. For Wastewater Treatment Plant projects: 
  Complete Attachment A, filling out specific information regarding this project 
B. For Sewer Infrastructure projects: 
  Complete Attachment B, filling out specific information regarding this project 
C. For Drinking Water  projects: 
  Complete Attachment C, filling out specific information regarding this project 
D. Permits 
  Provide copies of all permits and/or certifications that are required for this project as identified below.   
Permit/Certification Not Applicable Date Submitted Date Approved If Not Issued Provide 
Status and Expected 
Issuance Date 
Does this Permit match the 
Design Documents for this 
Project as Submitted for 
Review? 
Authorization to Construct*   
September 6, 
2019              
 Yes  No
CAMA X                      
 Yes  No
Dam Safety X                      
 Yes  No
NCDOT Encroachment 
Agreement X                      
 Yes  No
NPDES  X                      
 Yes  No
Railroad Encroachment 
Agreement X                      
 Yes  No
Sewer Extension*  X                       Yes  No
Soil Erosion and Sediment 
Control X                       Yes  No
Stormwater Management 
Plan X                       Yes  No
USCOE/Section 10 X                       Yes   No
USCOE/Section 404 Permit X                       Yes  No
Water Quality Certification 
(401) X                       Yes  No
Other:        X                       Yes  No
     *Provide application if not issued as of date of submittal of this package. 

  If no, clearly describe any portions of the design that vary from the Permit and the reasons for the differences.  
_______________________________________________   __             _      

          _    

                  _ 
Note: Based upon the scope of differences, a permit revisions may be required. 
Form PS‐SUBMITTAL‐05/18        Page 4  

E. Easements 
  Provide status of all easements required for completion of this project.          Not Applicable.  
F. Cost Estimate  
  For all project components provide a project line‐item cost estimate that has been prepared or updated not more than 60 
days prior to submittal of this package. This estimate should be at least as detailed as the bid form in the specifications.   
  Does the project design include any bid alternates?  Yes  No.   
  If yes, provide a separate project line‐item cost estimate for each bid alternate. 
G. Engineering Plans 
  Submit one set of detailed plans that have been signed, sealed and dated by a North Carolina Licensed Professional Engineer 
on each sheet of the engineering drawings. 
 Per 21 NCAC 56 .1103(a)(6), the name, address and License number of the Licensee’s firm shall be included on each sheet of 
the engineering drawings. 
    Plans must be labeled as follows: FINAL DRAWING – FOR REVIEW PURPOSES ONLY – NOT RELEASED FOR CONSTRUCTION.  
    The cover sheet of the plans must contain the CDBG, SRF, SRL, SEL, and/or State Grant Project Number. 
  Plans shall include all applicable disciplines needed for bidding and construction of the proposed project.   
H.  Engineering Specifications  
  Submit one set of specifications that have been signed, sealed and dated by a North Carolina Licensed Professional Engineer.   
  Specifications must be labeled as follows: FINAL SPECIFICATIONS – FOR REVIEW PURPOSES ONLY – NOT RELEASED FOR 
CONSTRUCTION.   
    The cover sheet of the specifications must contain the SRF, SRL, SEL, and/or State Grant Project Number.  
  A reasonable subsurface investigation must be made available to the contractor. If it is not included in the specifications, 
the specifications must advise where a copy of the report can be observed.  
  Specifications shall include all applicable disciplines needed for bidding and construction of the proposed project.   
  Contract duration 
  Applicable encroachment agreements (NCDOT, railroad, utilities, etc.)  
  Advertisement for Bids  
  Information for Bidders  
 Bid Form 
 Are portions of the project ineligible for CDBG, SRF, SRL, SEL, and/or State Grant funds?  Yes or  No. If yes, the bid 
form must clearly identify and break out separately the eligible and ineligible items. 
    Bid Bond  
    Agreement  
    Payment Bond  
    Performance Bond 
    Notice of Award with lines for signatures of the Owner and the Contractor (cannot substitute signature by Engineer) 
    Notice to Proceed with lines for signature of the Owner and the Contractor (cannot substitute signature by Engineer) 
    Change Order Form  
    General Conditions  
    Special Conditions  
For SRF and State funded projects only: 
 MBE/WBE (DBE) Compliance Supplement 
Additional for SRF funded projects only: 
 Davis‐Bacon Specifications 
 Wage Determination Schedule  
 American Iron and Steel Provisions 
Form PS‐SUBMITTAL‐05/18        Page 5  

For CDBG funded projects only: 
 MBE/WBE Compliance Instruction and Forms 
 Contractor Table CDBG‐I MBE/WBE 
 Advertisement for Bids 
 Statement encouraging Historically Underutilized Businesses (HUB) to submit bids/proposals 
 Statement encouraging Minority/Women Owner Businesses to submit bids/proposals 
 Section 3 Clause 
 Contractor’s Section 3 Plan Template 
 Labor Standard provisions 
 Davis‐Bacon Wage Determination 
 Contract Provisions 
 Certificate of Eligibility 
 Employment and Contracting Opportunities Commitment 
    Copy of all applicable State and Federal permits included in the specifications 

Form PS‐SUBMITTAL‐05/18        Page 7  

ATTACHMENT A 
INFORMATION REQUIRED FOR WASTEWATER TREATMENT PLANT INFRASTRUCTURE PROJECTS 
(New, Expanding, Replacement, and Rehabilitation) 

Submit a copy of the Authorization‐to‐Construct or application, if required for the project. 
A. Engineering Plans 
  Plan and profile views and associated details of all modified treatment units including piping, valves, and equipment 
(pumps, blowers, mixers, diffusers, electrical, etc.) 
  Are any modifications proposed that impact the hydraulic profile of the treatment facility?  Yes  No.  If yes, provide a 
hydraulic profile drawing on one sheet that includes all impacted upstream and downstream units.  The profile shall include 
the top of wall elevations of each impacted treatment unit and the water surface elevations within each impacted 
treatment unit for two flow conditions: (1) the NPDES permitted flow with all trains in service and (2) the peak hourly flow 
with one treatment train removed from service.   
  Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility? 
 Yes  No.  If yes, provide the process flow diagram or process flow schematic showing all modified flow paths including 
aeration, recycle/return, wasting, and chemical feed, with the location of all monitoring and control instruments noted. 
B. Engineering Specifications  
  Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers, 
diffusers, electrical, etc.), and instrumentation. 
  Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and 
pipelines, and performance testing requirements for equipment. 
C. Construction Sequence Plan 
  Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.  
The Plan must not imply that the Contractor is responsible for operation of treatment facilities. List the location of the 
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both: Construction 
sequence plan as in the Engineering Plans. 
D. Engineering Calculations  
  Submit one set of engineering calculations that have been signed, sealed and dated by a North Carolina Licensed 
Professional Engineer. 
The calculations shall include at a minimum: 
  Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.  
  Influent pollutant loading demonstrating how the design influent characteristics were determined. 
  Pollutant loading for each treatment unit demonstrating how the design effluent concentrations were determined. 
  Hydraulic loading for each treatment unit. 
  Sizing criteria for each treatment unit and associated equipment (blowers, mixers, pumps, etc.) 
  Total dynamic head (TDH) calculations and system curve analysis for each pump specified.  
  Buoyancy calculations for all below grade structures. 
  Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units. 

ROY COOPER
Governor IA *-11‘T
MICHAEL S.REGAN
Secretary aw+
VO4,%
LINDA CULPEPPER
Interim Director NORTH CAROLINA
Environmental Quality
October 19, 2018
Donna L. Davis
Stanly County Utilities Director
Stanly County
1000 North First Street, Suite 10
Albemarle,North Carolina 29001
Subject:Final NPDES Permit Renewal
Permit NC0043532
West Stanly WWTP
Stanly County
Grade III Biological WPCS
SIC Code 4952
Dear Ms. Davis:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly,we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007
or as subsequently amended).
Please note that the receiving streams are listed as impaired for copper and zinc on the North
Carolina 2016 303(d) Impaired Waters List. Addressing impaired waters is a high priority with
the Division, and instream data will continue to be evaluated. If there is noncompliance with
permitted effluent limits and stream impairment can be attributed to your facility, then mitigative
measures may be required.
The following changes were made to the draft permit sent to you on May 2,2018:
The facility classification has been added to the titles in Special Conditions A. (1), (2), &
3).
The fmal permit maintains the following significant changes identified in the letter sent on
May 2,2018:
The NC 2007-2014 Water Quality Standards(WQS)Triennial Review was approved by the NC
Environmental Management Committee(EMC) on November 13,2014. The US EPA
LDEQ
lemma of Eerhmas.bl0.\
nr,
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000
subsequently approved the WQS revisions on April 6,2016 with some exceptions.The NC
Division of Water Resources NPDES Permitting Unit is required to implement the new dissolved
metal standards in all permits public noticed after April 6,2016.The new standards for most
metals include acute standards.Further,the freshwater standards for several metals are expressed
as the dissolved form of the metals, and seven metals have hardness-dependent equations.
As a result,the NPDES Permitting Unit will need site-specific effluent hardness data and
instream hardness data,upstream of the discharge, for each facility monitoring these metals in
order to calculate permit limitations. Effluent hardness and instream hardness sampling,
upstream of the discharge,has been added to this permit at a monitoring frequency of quarterly.
See Section A. (1)Effluent Limitations and Monitoring Requirements.
Total copper and zinc monitoring have been changed to quarterly monitoring.A reasonable
potential analysis did not indicate potential to violate the WQS,however,both receiving streams
are impaired for copper and one for zinc,therefore monitoring will be maintained until the
streams can be re-evaluated under the new WQS or a TMDL is in place to address the
impairments.Additionally,in accordance with 15A NCAC 2B .0500 all test procedures must
produce detection and reporting levels that are below the permit discharge requirements and all
data generated must be reported to the approved detection level or lower reporting level of the
procedure. Currently,DWR's laboratory identifies the Practical Quantitation Limit(PQL)for
total copper at<2 µg/L and total zinc at<10 µg/L.Using these values as benchmarks, future
sampling for total copper and zinc should sample to these lower reporting levels.
In a limited dataset,bis(2-ethylhexyl)phthalate and cyanide showed reasonable potential to
violate WQS in Long Creek via emergency Outfall 001 and quarterly monitoring for these
parameters has been added to that outfall. See Section A. (2).
Emergency Outfall 001 has been removed upon expansion to 1.2 MGD.Upon expansion to 1.2
MGD,BOD, ammonia, and dissolved oxygen limits change and total nitrogen and phosphorous
sampling are increased to monthly. See Section A. (3).After expansion,the facility will have to
perform three seasonal effluent pollutant scans during the permit cycle and four second species
toxicity tests prior to permit renewal in accordance with 40 CFR 122.21(j)(5). See Section A. (5).
Instream monitoring for conductivity has been removed due to lack of industrial dischargers and a
pretreatment program.
Some of the wording in A. (4)CHRONIC TOXICITY PERMIT LIMIT has been updated,please
review carefully.The changes include a 6.0%effluent concentration at 1.2 MGD.
Special condition A. (6)EFFLUENT MERCURY ANALYSIS has been added to the permit
requiring at least one low level mercury analysis using EPA Method 1631E within 12 months
prior to the permit renewal application date until expansion to 1.2 MGD.
Federal program reports.The requirement to continue reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)internet
application has been added to your NPDES permit. [See Special Condition A. (7)] regulations
require electronic submittal of all discharge monitoring reports(DMRs)and
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
D E Qi
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental permits that may be required.
If you have any questions concerning this permit, please contact David Hill at [phone] or
via email at [e-mail].
Sincerely,
i
Le-
a
4\ ' .da Culpep o er t- 'm Director
ivision of Water Resources,NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality Regional Operations
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Susan Meadows
LD_EQ.#)raEartrcavneatal m
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000
Permit NC0043532
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
Stanly County
is hereby authorized to discharge wastewater from a facility located at the
West Stanly WWTP
Off of NCSR 1953
East of Oakboro
Stanly County
to receiving waters designated as the Rocky River(Outfall 002) and Long Creek(Outfall 001) in
the Yadkin—Pee Dee River Basin in accordance with effluent limitations,monitoring
requirements, and other conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective December 1, 2018
This permit and authorization to discharge shall expire at midnight January 31, 2023
Signed this day October 19, 2018
A-La
i. Culpeppe ir
m Director, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1of15
Permit NC0043532
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are
hereby revoked. As of this permit issuance, any previously issued permit bearing this number is
no longer effective. Therefore, the exclusive authority to operate and discharge from this facility
arises under the permit conditions, requirements, terms, and provisions included herein.
Stanly County
is hereby authorized to:
1.Continue to operate and maintain a 0.90 MGD wastewater treatment plant consisting
of the following components:
Influent pump station with bar screen, grit removal, flow measurement
Influent flow splitter box
Influent composite sampler
Two (2) 0.6 MG aeration basin with mechanical aerators
Clarifier splitter box
Two (2) 0.055 MG secondary clarifiers
WAS pump station
RAS pump station
One(1) 0.2 MG secondary clarifier
Return sludge pump station
0.035 MG Chlorine contact basin with dechlorination unit
Effluent composite sampler
Effluent pump station with three(3)pumps and force main to Outfall 002
Two (2) 225 ft2 sludge holding tanks
One(1) 0.4 MG aerobic digester/sludge holding basin with floating aerators,
floating mixer, a floating decant mechanism, and auxiliary pumps
Two (2) 1,250 ft2 sludge drying beds, surplus
Standby electric generator
The facility is located at the West Stanly WWTP, off of NCSR 1953, east of
Oakboro, Stanly County.
2. -After receiving an Authorization to Construct, construct a new wastewater treatment
facility with an average design flow of up to 1.2 MGD.
Continued next page)
Page 2 of 15
Permit NC0043532
Continued Supplement to Permit Cover Sheet)
3. Upon submittal of an Engineer's Certification form, operate said treatment works at
1.2 MGD.
4. Discharge from said treatment works at the locations specified on the attached map into
Rocky River (Outfall 002) and Long Creek (emergency Outfall 001 until expansion
above 0.9 MGD). Both locations are classified C waters in the Yadkin-Pee Dee River
Basin.
Page 3 of 15
Permit NC0043532
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution
Control System [15A NCAC 08G.0302]
a. During the period beginning on the effective date of the permit and lasting until expansion
above 0.9 MGD or expiration,whichever is sooner,the Permittee is authorized to discharge
treated domestic wastewater from Outfall 002 (Rocky River). Such discharges shall be
limited and monitored 1 by the Permittee as specified below:
EFFLUENT
LIMITATIONS' MONITORING REQUIREMENTS
CHARACTERISTICS Monthly . Weekly Daily ' Measurement Sample Sample
Average Average Maximum Frequency Type Location 2,
Flow 0.9 MGD Continuous Recording I or E
BOD, 5 day,20°C 3
9.0 mg/L 13.5 mg/L 3/Week Composite I and EApril1 —October 31)
BOD, 5 day, 20°C 3
18.0 mg/L 27.0 mg/L 3/Week Composite I and ENovember1 —March 31)
Total Suspended Solids 3 30.0 mg/L 45.0 mg/L 3/Week Composite I and E
NH3 as N
3.0 mg/L 9.0 mg/L 3/Week Composite EApril1 —October 31)
NH3 as N
6.0 mg/L 18.0 mg/L 3/Week Composite ENovember1 —March 31)
Dissolved Oxygen Not less than 5.0 mg/L, daily average 3/Week Grab E
Dissolved Oxygen,mg/L Variable 2 Grab U,D
pH Between 6.0 and 9.0 Standard Units 3/Week Grab E
Fecal Coliform
200/100 mL 400/100 mL 3/Week Grab E
geometric mean)
Fecal Coliform,#/100 mL Variable 2 Grab U, D
Total Residual Chlorine 4 28 µg/L 3/Week Grab E
Total Copper, µg/L Quarterly Composite E
Total Zinc, µg/L Quarterly Composite E
Temperature, °C Daily Grab E
Temperature, °C Variable 2 Grab U, D
Total Hardness as
s Quarterly Composite E
CaCO3] ,mg/L
Total Hardness as
Quarterly Grab U
CaCO3] 6, mg/L
Total Nitrogen 7,
mg/L Quarterly Composite E
Total Phosphorus,mg/L Quarterly Composite E
Chronic Toxicity 8
Quarterly Composite E
Page 4 of 15
Permit NC0043532
Continued A. (1)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC
DWR's eDMR application system. See Special Condition A. (7).
2. Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the
discharge point, D - Downstream 1.7 miles below the discharge point (near the end of
NCSR 1659). Instream monitoring requirements are waived as long as the facility
retains membership in the Yadkin-Pee Dee River Basin Association. If membership is
cancelled, facility will monitor 3/week during the months of June through September
and once per week during the remaining months of the year.
3. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of
the respective influent value(85%removal).
4. The Division shall consider all effluent total residual chlorine values reported below 50
g/L to be in compliance with the permit. However, the Permittee shall continue to
record and submit all values reported by a North Carolina certified laboratory(including
filed certified) even if these values fall below 50 µg/L.
5. Effluent hardness sampling shall be performed in conjunction with testing for hardness
dependent metals (cadmium, chromium, copper, lead,nickel, silver, and zinc).
6. The Permittee shall sample instream hardness, approximately 100 yards upstream from
the facility's discharge and shall be representative of the hardness in the receiving
stream. If the Permittee is a member of a Monitoring Coalition Program, sampling for
instream hardness may be waived as long as the Monitoring Coalition agrees to sample
hardness at the same upstream location, at a minimum frequency of quarterly, and the
Permittee has obtained approval from the DWR -NPDES Permitting Unit. The
Permittee is responsible for submitting instream hardness test results with its permit
renewal application package. If Coalition membership,is cancelled or the Coalition
terminates instream hardness sampling at the approved station, the Permittee will
immediately notify the Division and resume sampling for instream hardness,upstream
of its discharge.
7. Total Nitrogen is the sum of TKN+NO3-N+NO2-N, where TKN and NO3-N+NO2-
N are Total Kjeldahl Nitrogen and Nitrate and Nitrite Nitrogen respectively.
8. Chronic Toxicity (Ceriodaphnia) P/F at 4.6%; January, April, July, and October. See
Special Condition A. (4)—Outfall 002.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 5 of 15
Permit NC0043532
A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
115A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution
Control System [15A NCAC 08G.0302]
a. During the period beginning on the effective date of the permit and lasting until expansion
above 0.9 MGD or expiration, the Permittee is authorized to discharge treated domestic
wastewater from emergency backup Outfall 001 (Long Creek) in case of an effluent
pump station failure. Such discharges shall be limited and monitored 1 by the Permittee
as specified below:
EFFLUENT
LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 2
Flow 0.9 MGD Continuous Recording I or E
BOD,5 day,20°C 3
9.0 mg/L 13.5 mg/L 3/Week Composite I and E
April 1 —October 31)
BOD, 5 day, 20°C 3
18.0 mg/L 27.0 mg/L 3/Week Composite I and E
November 1 —March 31)
Total Suspended Solids 3 30.0 mg/L 45.0 mg/L 3/Week Composite I and E
NH3 as N
2.8 mg/L 8.4 mg/L 3/Week Composite E
April 1 —October 31)
NH3 as N
6.0 mg/L 18.0 mg/L 3/Week Composite E
November 1 —March 31)
Dissolved Oxygen Not less than 5.0 mg/L, daily average 3/Week Grab E
Dissolved Oxygen,mg/L Variable 2 Grab U,D
pH Between 6.0 and 9.0 Standard Units 3/Week Grab E
Fecal Coliform
200/100 mL 400/100 mL 3/Week Grab E
geometric mean)
Fecal Coliform,#/100 mL Variable 2 Grab U,D
Total Residual Chlorine 4 28 µg/L 3/Week Grab E
Total Copper, µg/L Quarterly Composite E
Total Zinc, µg/L Quarterly Composite E
Temperature, °C Daily Grab E
Temperature, °C Variable 2 Grab U,D
Total Hardness as
Quarterly Composite E
CaCO3]5,mg/L
Total Hardness as
CaCO3] 6,
mg/L Quarterly Grab U
Total Nitrogen 7,
mg/L Quarterly Composite E
Total Phosphorus,mg/L Quarterly Composite E
Chronic Toxicity 8 Quarterly Composite E
Bis(2-ethylhexyl)phthalate,
Quarterly Composite E
g,
Cyanide,mg/L Quarterly Grab E
Page 6of15
Permit NC0043532
Continued A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC
DWR's eDMR application system. See Special Condition A. (7).
2. Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the
discharge point, D -Downstream 1.7 miles below the discharge point(near the end of
NCSR 1659). Instream monitoring requirements are waived as long as the facility
retains membership in the Yadkin-Pee Dee River Basin Association. If membership is
cancelled, facility will monitor 3/week during the months of June through September
and once per week during the remaining months of the year.
3. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of
the respective influent value(85%removal).
4. The Division shall consider all effluent total residual chlorine values reported below
50 µg/L to be in compliance with the permit. However,the Permittee shall continue to
record and submit all values reported by a North Carolina certified laboratory
including filed certified) even if these values fall below 50 µg/L.
5. Effluent hardness sampling shall be performed in conjunction with testing for hardness
dependent metals (cadmium, chromium, copper, lead, nickel, silver, and zinc).
6. The Permittee shall sample instream hardness,approximately 100 yards upstream from
the facility's discharge and shall be representative of the hardness in the receiving
stream. If the Permittee is a member of a Monitoring Coalition Program, sampling for
instream hardness may be waived as long as the Monitoring Coalition agrees to sample
hardness at the same upstream location, at a minimum frequency of quarterly, and the
Permittee has obtained approval from the DWR -NPDES Permitting Unit. The
Permittee is responsible for submitting instream hardness test results with its permit
renewal application package. If Coalition membership is cancelled or the Coalition
terminates instream hardness sampling at the approved station, the Permittee will
immediately notify the Division and resume sampling for instream hardness,upstream
of its discharge.
7. Total Nitrogen is the sum of TKN+NO3-N+NO2-N,where TKN and NO3-N+NO2-
N are Total Kjeldahl Nitrogen and Nitrate and Nitrite Nitrogen respectively.
8. Chronic Toxicity (Ceriodaphnia) P/F at 30%; January, April, July, and October. See
Special Condition A. (4)—Outfall 001.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 7 of 15
Permit NC0043532
A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
115A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution
Control System [15A NCAC 08G.0302]
a. During the period beginning upon receipt of an Engineer's Certificate for completion of
the 1.2 MGD expansion and lasting until expiration, the Permittee is authorized to
discharge treated domestic wastewater from Outfall 002 (Rocky River). Such discharges
shall be limited and monitored
1 by the Permittee as specified below:
EFFLUENT
LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample
Average . Average Maximum Frequency ., 'Type Location 2
Flow 1.2 MGD Continuous Recording I or E
BOD, 5 day, 20°C 3 10.0 mg/L 15.0 mg/L 3/Week Composite I and E
Total Suspended Solids 3 30.0 mg/L 45.0 mg/L 3/Week Composite I and E
NH3 as N 4.0 mg/L 12.0 mg/L 3/Week Composite E
Dissolved Oxygen Not less than 6.0 mg/L, daily average 3/Week Grab E
Dissolved Oxygen,mg/L Variable 2 Grab U, D
pH Between 6.0 and 9.0 Standard Units 3/Week Grab E
Fecal Coliform
200/100 mL 400/100 mL 3/Week Grab E
geometric mean)
Fecal Coliform, #/100 mL Variable 2 Grab U, D
Total Residual Chlorine 4 28 µg/L 3/Week Grab E
Total Copper, µg/L Quarterly Composite E
Total Zinc, gg/L Quarterly Composite E
Temperature, °C Daily Grab E
Temperature, °C Variable 2 Grab U, D
Total Hardness as
s Quarterly Composite E
CaCO3] ,mg/L
Total Hardness as
6 Quarterly Grab U
CaCO3] ,mg/L
Total Nitrogen 7,
mg/L Monthly Composite E
Total Phosphorus,mg/L Monthly Composite E
Chronic Toxicity 8
Quarterly Composite E
Effluent Pollutant Scan See Footnote 9 E
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC
DWR's eDMR application system. See Special Condition A. (7).
Page 8 of 15
1
West Stanly u ; outfall 001 C'.1i ,,=,..,'..
r:
4
tr
Ni.M....
1.-
B-.
7.„
W•.T0'\'n'..
1.,...
76.,O,.,iA (
e _
c,-
f_)/_._
e.,(.40'
i- .
WWTP Upstream
P
a'
7....r....,.,...
0____/.-,.
r_xA 4:,...
It _.__ ,-,.... ._.•., ,..._.- 7-..._ .z./ ..-i_lit:/ , 171vt,,,,,..7 1,...,_. ,Iik, _,., .—el, 3—c--- .....
t. c ..... .,..„..
d et4.
4.4.) s,.......4) 44,,i ,.,,,,\,
gig'7ve"
ofil
NO . -, ' 1,-,;;,\-\v,ii ,
4( •
tf,--, .), ) -'l ''' 'ilKti--. ..1 ji
f/3 7; °Wall 001
r .
a, f
r
11,-
zi),,,... 1-- ,-,w .t- S.
t„ --:"'-'-'4 s\%?
Fo. Hyloij I
7:-.—''...1 2.), Gt. ___c!_. -:::" 1 r--) 4 r -.I r 4, „:"-::, iICP- " ..-..-- el,A: hh \ --''7. -:,I 1 76)4 „\ I A k\ ---.. ---_,
r -•:i L./
a:
ji
t..\--(
2.,,,,,-.....:-.Ni
41 v ,) /) k.„..... /'t , . .,-,,,/ .
4.„,,,/ .,,..
4, , - ,
r. t i /. ,,
rijj „
Jet ,
i ,. ..!,!yr, , ,,.,,,,,„k\
N ,.,,,--
C.1„,c., ,---...3 0
P;
1\
1\
101/4N1,57,,
F )1, 5 r,,,,1,‘\_,,,• r • *
v;\_ i (i/AfV, .;:-.
e,/ ,..*,...../ "
rt.( ,,i
z..c.j-,
23-"?..-jr---
o /-...e z, '..„:.. --:,,\ 0 ;,IX, 1. / !_,..."/:, 0 ,..„,-- \ ....0 -
it A. - ,
ir - / V ;C
f,
am/
r -
O `
ti` 7 `11,,> I ! ,. • •
wr :
rte?-1
y.r:- -.• '..(\
I'
O
fir
Outfall 002 Lip, (c_t'<•rk1 , - 7 `1 U-. Out a
mo
i`
f._-ik>>
1 cel, t FL. „l .14...,61.(----!:
j Outfall 002 0 i ,-. . / ,
4I4
s
4
Upstream , \ y, /-;;r" t
7)
kitid/,:.<
11.....,\N\
u: L..A,1%
t ,
6;
1,
i i,
i,,,s,..,.,,,
c'e, , )ti0A.7
U ;`ii''' 1
q c s
r 'yN 110``jl ( It , ;
1 T)(
1(\ , \ / «` `
Q.1,27:3J
J1
111 I 1 E
1
f+ !
p yf•,
ii ,, -
lam _
1C."1 .%„___,,../„ )J. L i` ‘I '\,,...••- ./..1 -=a"( --
1•'
l `% ;?1 0?),..: ;
f. / '
f"-)11 k' /rte /, f/'
Y \ \\ '' ......
i ... .;: (.'J \ C 't {`(1I• •' _- .``.,,
i.•
n ( A ft l V .
1 / .'/ '
int `,
w.- .1.(//
i _
ffli
T 1, e . , ,,
if, .,
t f// 4'l
4.
1:::,.....‘i‘, k\ ,.. tirel.,..,---,• .., , :. l,r----..-7-
1; f, 1 2' Outfalls 001 & 002 N;(-
v.,
t_, , -tom Downstream I
f 41 ,(2,j, ,, r , , i \•, ' , f4 L'C
1 ;r•-/,:.../ 1, X17• + if/,,,:,,,,,,,,:
i.
r f/1. (c9,
111;
2/.,") +\ , .:. M",
fie,/ l r--'r • -F/
ir }' ,
f`" `y `
J
F//. r.5-\.,...,,,..47>1 f
i
x! \- 1 f 1 sY f
a."":14/..s\‘‘.
C ,f
t4', ,.::„..._,..„.._00FS '
l-) if i((..kv/, /ate, - \-\\ ,it- --
1,
ii/2--, , --,
7 r.,.,.,..„,,a/ 1if t. f qtr_ f It -->,;,r 1`
7,,,.,,1 I 5\)
1Kr-
rte'.:,,.{-' r_J ..t;_ i%
5-
SCALE: 1:24000
USGS Quad: G 17NE Oakboro,NC
ippFacilityOutfall001Outfall002
Latitude: 35° 14'9.8"N 35° 14' 7.8"N 35° 12'41"N
Longitude: 80° 16' 8.9"W 80° 15' 58" W 80° 15' 16" W
Streams Class:C Facility Location
Subbasins:03-14-13/03-14-14 HUC: 03040105 North
Receiving Streams:Outfall 001 Long Creek/Outfall 002 Rocky West Stanly WWTP NC0043532
River Stanly County
Permit NC0043532
Continued A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
2. Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the
discharge point, D _Downstream 1.7 miles below the discharge point(near the end of
NCSR 1659). Instream monitoring requirements are waived as long as the facility
retains membership in the Yadkin-Pee Dee River Basin Association. If membership is
cancelled, facility will monitor 3/week during the months of June through September
and once per week during the remaining months of the year.
3. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of
the respective influent value(85%removal).
4. The Division shall consider all effluent total residual chlorine values reported below
50 µg/L to be in compliance with the permit.However,the Permittee shall continue to
record and submit all values reported by a North Carolina certified laboratory
including filed certified) even if these values fall below 50 µg/L.
5. Effluent hardness sampling shall be performed in conjunction with testing for hardness
dependent metals (cadmium, chromium, copper, lead, nickel, silver, and zinc).
6. The Permittee shall sample instream hardness,approximately 100 yards upstream from
the facility's discharge and shall be representative of the hardness in the receiving
stream. If the Permittee is a member of a Monitoring Coalition Program, sampling for
instream hardness may be waived as long as the Monitoring Coalition agrees to sample
hardness at the same upstream location, at a minimum frequency of quarterly, and the
Permittee has obtained approval from the DWR -NPDES Permitting Unit. The
Permittee is responsible for submitting instream hardness test results with its permit
renewal application package. If Coalition membership is cancelled or the Coalition
terminates instream hardness sampling at the approved station, the Permittee will
immediately notify the Division and resume sampling for instream hardness,upstream
of its discharge.
7. Total Nitrogen is the sum of TKN+NO3-N+NO2-N,where TKN and NO3-N+NO2-
N are Total Kjeldahl Nitrogen and Nitrate and Nitrite Nitrogen respectively.
8. Chronic Toxicity(Ceriodaphnia) P/F at 6.0%; January, April, July, and October. See
Special Condition A. (4)—Outfall 002.
9. The permittee shall perform three Effluent Pollutant Scans and four Second Species '
Toxicity Tests in conjunction with this permit next renewal, commencing with this
permit activation of the 1.2 MGD terms. See Special Condition A. (5).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 9 of 15
Permit NC0043532
A. (4) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
15A NCAC 02B .0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 4.6% for a permitted flow of 0.9
MGD and 6.0% for a permitted flow of 1.2 MGD from Outfall 002. An effluent concentration of
30.0% shall be used for a permitted flow of 0.9 MGD from Outfall 001.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined
in the `North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December
2010, or subsequent versions or"North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure"(Revised-December 2010)or subsequent versions.The tests will be performed during
the months of January, April, July, and October. These months signify the first month of
each three-month toxicity testing quarter assigned to the facility. Effluent sampling for this testing
must be obtained during representative effluent discharge and shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or
ChV below the permit limit, then multiple-concentration testing shall be performed at a
minimum, in each of the two following months as described in "North Carolina Phase II
Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010) or subsequent
versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,
DWR Form AT-3 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh,NC 27699-1623
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate,include all supporting chemical/physical measurements and
all concentration/response data, and be certified by laboratory supervisor and ORC or approved
designate signature. Total residual chlorine of the effluent toxicity sample must be measured and
reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring
is required, the permittee will complete the information located at the top of the aquatic toxicity
AT) test form indicating the facility name, permit number, pipe number, county, and the
month/year of the report with the notation of"No Flow" in the comment area of the form. The
report shall be submitted to the Water Sciences Section at the address cited above.
Page 10of15
Permit NC0043532
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
monitoring will be required during the following month. Assessment of toxicity compliance is
based on the toxicity testing quarter,which is the three month time interval that begins on the first
Continued A. (4) CHRONIC TOXICITY PERMIT LIMIT(QUARTERLY))
day of the month in which toxicity testing is required by this permit and continues until the final
day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream, this permit may
be re-opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival, minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial
monitoring.
A. (5) EFFLUENT POLLUTANT SCAN
G.S. 143-215.1(b)]
Once the 1.2 MGD limitation page is effective,the Permittee shall perform a total of three(3)Effluent Pollutant
Scans for all parameters listed below. Based on the time between the 1.2 MGD effective date and when the
renewal application is submitted, the three scans will be conducted at equal intervals so the data can be
incorporated in the renewal application.Analytical methods shall be in accordance with 40 CFR Part 136 and
shall be sufficiently sensitive to determine whether parameters are present in concentrations greater than
applicable standards and criteria. Samples should be collected with one quarterly toxicity test each scan, and
must represent seasonal variation [i.e., do not sample in the same quarter every year]. Unless otherwise
indicated,metals shall be analyzed as"total recoverable."
Ammonia(as N) Trans-1,2-dichloroethylene Bis(2-chloroethyl)ether
Chlorine(total residual,TRC) 1,1-dichloroethylene Bis(2-chloroisopropyl)ether
Dissolved oxygen 1,2-dichloropropane Bis(2-ethylhexyl)phthalate
Nitrate/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether
Kjeldahl nitrogen Ethylbenzene Butyl benzyl phthalate
Oil and grease Methyl bromide 2-chloronaphthalene
Phosphorus Methyl chloride 4-chlorophenyl phenyl ether
Total dissolved solids Methylene chloride Chrysene
Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1,1,1-trichloroethane 1,2-dichlorobenzene
Cadmium 1,1,2-trichloroethane 1,3-dichlorobenzene
Chromium Trichloroethylene 1,4-dichlorobenzene
Copper Vinyl chloride 3,3-dichlorobenzidine
Lead Acid-extractable compounds: Diethyl phthalate
Mercury(EPA Method 1631E) P-chloro-m-cresol Dimethyl phthalate
Nickel 2-chlorophenol 2,4-dimtrotoluene
Selenium 2,4-dichlorophenol 2,6-dinitrotoluene
Silver 2,4-dimethylphenol 1,2-diphenylhydrazine
Page 11 of 15
Permit NC0043532
Thallium 4,6-dinitro-o-cresol Fluoranthene
Zinc 2,4-dinitrophenol Fluorene
Cyanide 2-nitrophenol Hexachlorobenzene
Total phenolic compounds 4-nitrophenol Hexachlorobutadiene
Volatile organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene
Acrolein Phenol Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol Indeno(1,2,3-cd)pyrene
Benzene Base-neutral compounds: Isophorone
Bromoform Acenaphthene Naphthalene
Carbon tetrachloride Acenaphthylene Nitrobenzene
Chlorobenzene Anthracene N-nitrosodi-n-propylamine
Chlorodibromomethane Benzidine N-nitrosodimethylamine
Chloroethane Benzo(a)anthracene N-nitrosodiphenylamine
2-chloroethylvinyl ether Benzo(a)pyrene Phenanthrene
Chloroform 3,4 benzofluoranthene Pyrene
Dichlorobromomethane Benzo(ghi)perylene 1,2,4-trichlorobenzene
1,1-dichloroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis(2-chloroethoxy)methane
Reporting. Test results shall be reported on DWQ Form-A MR-PPA1 (or in a form approved'by the
Director) by December 31St of each designated sampling year. The report shall be submitted to the
following address: NC NCDWR/ Central Files, 1617 Mail Service Center, Raleigh, North Carolina
27699-1617.
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal
facilities that are subject to the Effluent Pollutant Scan requirements listed above are also subject to
additional toxicity testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5). The US EPA
requires four(4)toxicity tests for a test organism other than the test species currently required in this permit.
The multiple species tests should be conducted either quarterly for a 12-month period prior to submittal of
the permit renewal application,or four tests performed at least annually in the four and one half year period
prior to the next renewal application. These tests shall be performed for acute or chronic toxicity,whichever
is specified in this permit. The multiple species toxicity test results shall be filed with the Aquatic
Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh,North Carolina 27699-1623
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E(Toxicity
Testing Data)of EPA Municipal Application Form 2A,when submitting the permit renewal application to
the NPDES Permitting Unit.
A. (6) EFFLUENT MERCURY ANALYSIS
G.S. 143-215.3(a)(2), G.S. 143-215.66]
If no Effluent Pollutant Scans are required in conjunction with the next permit renewal, the
Permittee shall provide in conjunction with the next permit renewal application a minimum of one
effluent mercury analysis using EPA Method 1631E determined within 12 months prior to the
Page 12 of 15
Permit NC0043532
application date.Any additional effluent mercury measurements conducted from the effective date
of this permit and up to the application date shall also be submitted with the renewal application.
If the mercury analysis is not provided with the application, the application may be returned as
incomplete and the Permittee considered non-compliant.
A. (7) ELECTRONIC REPORTING OF DISCHARGE MONITORING
REPORTS [G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective
on December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit(Standard Conditions for NPDES Permits):
Section B.'(11.) Signatory Requirements
Section D. (2.) Reporting
Section D. (6.) Records Retention
Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E.(5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report(eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each
month and submitted electronically using eDMR. The eDMR system allows permitted
facilities to enter monitoring data and submit DMRs electronically using the internet. Until
such time that the state's eDMR application is compliant with EPA's Cross-Media Electronic
Reporting Regulation(CROMERR),permittees will be required to submit all discharge
monitoring data to the state electronically using eDMR and will be required to complete the
eDMR submission by printing, signing, and submitting one signed original and a copy of the
computer printed eDMR to the following address:
NC DENR/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting
requirements may be granted and discharge monitoring data may be submitted on paper
DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by the Director. Duplicate
signed copies shall be submitted to the mailing address above. See"How to Request a
Waiver from Electronic Reporting" section below.
Page 13 of 15
Permit NC0043532
Regardless of the submission method, the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility, on the last day of the
month following the commencement of discharge.
Starting on December 21,2020, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
Sewer Overflow/Bypass Event Reports;
Pretreatment Program Annual Reports; and
Clean Water Act(CWA) Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to
Request a Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at
the time of each electronic submission. The permittee should use the EPA's website
resources to identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the
entity(EPA or the state authorized by EPA to implement the NPDES program) that is the
designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool
for each type of electronic submission and for each state. Instructions on how to access and
use the appropriate electronic reporting tool will be available as well. Information on EPA's
NPDES Electronic Reporting Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-
discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements" section
above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To
obtain an electronic reporting waiver, a permittee must first submit an electronic reporting
waiver request to the Division. Requests for temporary electronic reporting waivers must be
submitted in writing to the Division for written approval at least sixty(60) days prior to the
date the facility would be required under this permit to begin submitting monitoring data and
reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the
Division unless the permittee re-applies for and is granted a new temporary electronic
reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective.
Page 14 of 15
Permit NC0043532
Information on eDMR and the application for a temporary electronic reporting waiver are
found on the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements (Supplements Section B. (11.) (b) and Supersedes Section B. (11.)(d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (11.)(a) or by a duly authorized representative of that person as described
in Part II, Section B. (11.)(b). A person, and not a position,must be delegated signatory
authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR
user account and login credentials to access the eDMR system. For more information on
North Carolina's eDMR system,registering for eDMR and obtaining an eDMR user account,
please visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system
shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
I certify, under penalty of law, that this document and all attachments were prepared under
my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility offines and imprisonment for knowing
violations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41].
Page 15of15
NPDES Permit Standard Conditions
Page 1 of 18
PART II
STANDARD CONDITIONS FOR NPDES PERMITS
Section A. Definitions
2/Month
Samples are collected twice per month with at least ten calendar days between sampling events. These samples shall be
representative of the wastewater discharged during the sample period.
3/Week
Samples are collected three times per week on three separate calendar days. These samples shall be representative of
the wastewater discharged during the sample period.
Act or"the Act"
The Federal Water Pollution Control Act,also known as the Clean Water Act(CWA),as amended, 33 USC 1251,et.
seq.
Annual Average
The arithmetic mean of all"daily discharges"of a pollutant measured during the calendar year. In the case of fecal
coliform,the geometric mean of such discharges.
Arithmetic Mean
The summation of the individual values divided by the number of individual values.
Bypass
The known diversion of waste streams from any portion of a treatment facility including the collection system,which is
not a designed or established or operating mode for the facility.
Calendar Day
The period from midnight of one day until midnight of the next day.However,for purposes of this permit, any
consecutive 24-hour period that reasonably represents the calendar day may be used for sampling.
Calendar Week
The period from Sunday through the following Saturday.
Calendar Quarter
One of the following distinct periods:January through March,April through June,July through September,and
October through December.
Composite Sample
A sample collected over a 24-hour period by continuous sampling or combining grab samples of at least 100 mL in
such a manner as to result in a total sample representative of the wastewater discharge during the sample period.The
Director may designate the most appropriate method(specific number and size of aliquots necessary,the time interval
between grab samples,etc.)on a case-by-case basis. Samples may be collected manually or automatically. Composite
samples may be obtained by the following methods:
1) Continuous: a single, continuous sample collected over a 24-hour period proportional to the rate of flow.
2) Constant time/variable volume: a series of grab samples collected at equal time intervals over a 24 hour period
of discharge and combined proportional to the rate of flow measured at the time of individual sample
collection,or
3) Variable time/constant volume: a series of grab samples of equal volume collected over a 24 hour period with
the time intervals between samples determined by a preset number of gallons passing the sampling point. Flow
measurement between sample intervals shall be determined by use of a flow recorder and totalizer, and the
preset gallon interval between sample collection fixed at no greater than 1/24 of the expected total daily flow at
the treatment system, or
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 2 of 18
4) Constant time/constant volume: a series of grab samples of equal volume collected over a 24-hour period at a
constant time interval.Use of this method requires prior approval by the Director. This method may only be
used in situations where effluent flow rates vary less than 15 percent. The following restrictions also apply:
Influent and effluent grab samples shall be of equal size and of no less than 100 milliliters
Influent samples shall not be collected more than once per hour.
Permittees with wastewater treatment systems whose detention time<24 hours shall collect effluent grab
samples at intervals of no greater than 20 minutes apart during any 24-hour period.
Permittees with wastewater treatment systems whose detention time exceeds 24 hours shall collect effluent
grab samples at least every six hours;there must be a minimum of four samples during a 24-hour sampling
period.
Continuous flow measurement
Flow monitoring that occurs without interruption throughout the operating hours of the facility.Flow shall be
monitored continually except for the infrequent times when there may be no flow or for infrequent maintenance
activities on the flow device.
Daily Discharge
The discharge of a pollutant measured during a calendar day or any 24-hour period that reasonably represents the
calendar day for purposes of sampling. For pollutants measured in units of mass,the "daily discharge"is calculated as
the total mass of the pollutant discharged over the day. For pollutants expressed in other units of measurement,the
daily discharge"is calculated as the average measurement of the pollutant over the day. (40 CFR 122.2; see also
Composite Sample,"above.)
Daily Maximum
The highest"daily discharge"during the calendar month.
Daily Sampling
Parameters requiring daily sampling shall be sampled 5 out of every 7 days per week unless otherwise specified in the
permit. Sampling shall be conducted on weekdays except where holidays or other disruptions of normal operations
prevent weekday sampling. If sampling is required for all seven days of the week for any permit parameter(s),that
requirement will be so noted on the Effluent Limitations and Monitoring Page(s).
DWR or"the Division"
The Division of Water Resources,Department of Environment and Natural Resources.
Effluent
Wastewater discharged following all treatment processes from a water pollution control facility or other point source
whether treated or untreated.
EMC
The North Carolina Environmental Management Commission
EPA
The United States Environmental Protection Agency
Facility Closure
Cessation of all activities that require coverage under this NPDES permit. Completion of facility closure will allow this
permit to be rescinded.
Geometric Mean
The Nth root of the product of the individual values where N=the number of individual values.For purposes of
calculating the geometric mean,values of"0"(or"< [detection level]")shall be considered= 1.
Grab Sample
Individual samples of at least 100 mL collected over a period of time not exceeding 15 minutes. Grab samples can be
collected manually. Grab samples must be representative of the discharge(or the receiving stream, for instream
samples).
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 3of18
Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the CWA.
Instantaneous flow measurement
The flow measured during the minimum time required for the flow measuring device or method to produce a result in
that instance. To the extent practical,instantaneous flow measurements coincide with the collection of any grab
samples required for the same sampling period so that together the samples and flow are representative of the discharge
during that sampling period.
Monthly Average(concentration limit)
The arithmetic mean of all"daily discharges"of a pollutant measured during the calendar month. In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Permit Issuing Authority
The Director of the Division of Water Resources.
Quarterly Average(concentration limit)
The arithmetic mean of all samples taken over a calendar quarter.
Severe property damage
Substantial physical damage to property,damage to the treatment facilities which causes them to become inoperable, or
substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a
bypass. Severe property damage excludes economic loss caused by delays in production.
Toxic Pollutant:
Any pollutant listed as toxic under Section 307(a)(1)of the CWA.
Upset
An incident beyond the reasonable control of the Permittee causing unintentional and temporary noncompliance with
permit effluent limitations and/or monitoring requirements.An upset does not include noncompliance caused by
operational error,improperly designed treatment facilities, inadequate treatment facilities, lack of preventive
maintenance,or careless or improper operation.
Weekly Average(concentration limit)
The arithmetic mean of all "daily discharges" of a pollutant measured during the calendar week.In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Section B. General Conditions
1. Duty to Comply
The Permittee must comply with all conditions of this permit.Any permit noncompliance constitutes a violation of
the CWA and is grounds for enforcement action;for permit termination,revocation and reissuance,or
modification; or denial of a permit renewal application[40 CFR 122.41].
a. The Permittee shall comply with effluent standards or prohibitions established under section 307(a)of the
CWA for toxic pollutants and with standards for sewage sludge use or disposal established under section
405(d)of the CWA within the time provided in the regulations that establish these standards or prohibitions or
standards for sewage sludge use or disposal, even if the permit has not yet been modified to incorporate the
requirement.
b. The CWA provides that any person who violates section[s] 301,302,306, 307, 308, 318 or 405 of the Act, or
any permit condition or limitation implementing any such sections in a permit issued under section 402,or any
requirement imposed in a pretreatment program approved under sections 402(a)(3)or 402(b)(8)of the Act, is
subject to a civil penalty not to exceed$37,500 per day for each violation. [33 USC 1319(d)and 40 CFR
122.41(a)(2)]
c. The CWA provides that any person who negligently violates sections 301, 302, 306, 307, 308,318, or 405 of
the Act, or any condition or limitation implementing any of such sections in a permit issued under section 402
of the Act,or any requirement imposed in a pretreatment program approved under section 402(a)(3)or
402(b)(8)of the Act,is subject to criminal penalties of$2,500 to $25,000 per day of violation,or
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 4 of 18
imprisonment of not more than 1 year, or both. In the case of a second or subsequent conviction for a negligent
violation,a person shall be subject to criminal penalties.of not more than$50,000 per day of violation,or by
imprisonment of not more than 2 years, or both. [33 USC 1319(c)(1)and 40 CFR 122.41(a)(2)]
d. Any person who knowingly violates such sections,or such conditions or limitations is subject to criminal
penalties of$5,000 to$50,000 per day of violation,or imprisonment for not more than 3 years,or both.In the
case of a second or subsequent conviction for a knowing violation,a person shall be subject to criminal
penalties of not more than$100,000 per day of violation,or imprisonment of not more than 6 years,or both.
33 USC 1319(c)(2)and 40 CFR 122.41(a)(2)]
e. Any person who knowingly violates section 301, 302, 303,306,307,308,318 or 405 of the Act,or any permit
condition or limitation implementing any of such sections in a permit issued under section 402 of the Act,and
who knows at that time that he thereby places another person in imminent danger of death or serious bodily
injury,shall,upon conviction,be subject to a fine of not more than$250,000 or imprisonment of not more than
15 years,or both.In the case of a second or subsequent conviction for a knowing endangerment violation, a
person shall be subject to a fine of not more than$500,000 or by imprisonment of not more than 30 years, or
both.An organization,as defined in section 309(c)(3)(B)(iii)of the CWA,shall,upon conviction of violating
the imminent danger provision,be subject to a fine of not more than$1,000,000 and can be fined up to
2,000,000 for second or subsequent convictions. [40 CFR 122.41(a)(2)]
f. Under state law, a civil penalty of not more than$25,000 per violation maybe assessed against any person
who violates or fails to act in accordance with the terms, conditions, or requirements of a permit. [North
Carolina General Statutes § 143-215.6A]
g. Any person maybe assessed an administrative penalty by the Administrator for violating section 301,302,
306, 307,308,318 or 405 of this Act, or any permit condition or limitation implementing any of such sections
in a permit issued under section 402 of this Act.Administrative penalties for Class I violations are not to
exceed$16,000 per violation,with the maximum amount of any Class I penalty assessed not to exceed
37,500.Penalties for Class II violations are not to exceed$16,000 per day for each day during which the
violation continues,with the maximum amount of any Class II penalty not to exceed$177,500. [33 USC
1319(g)(2)and 40 CFR 122.41(a)(3)]
2. Duty to Mitigate
The Permittee shall take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in
violation of this permit with a reasonable likelihood of adversely affecting human health or the environment[40
CFR 122.41(d)].
3. Civil and Criminal Liability
Except as provided in permit conditions on"Bypassing" (Part II.C.4),"Upsets"(Part II.C.5)and"Power Failures"
Part H.C.7),nothing in this permit shall be construed to relieve the Permittee from any responsibilities,liabilities,
or penalties for noncompliance pursuant to NCGS 143-215.3, 143-215.6 or Section 309 of the Federal Act, 33 USC
1319.Furthermore,the Permittee is responsible for consequential damages, such as fish kills, even though the
responsibility for effective compliance may be temporarily suspended.
4. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the Permittee
from any responsibilities, liabilities,or penalties to which the Permittee is or may be subject to under NCGS 143-
215.75 et seq. or Section 311 of the Federal Act, 33 USG 1321. Furthermore,the Permittee is responsible for
consequential damages, such as fish kills, even though the responsibility for effective compliance may be
temporarily suspended.
5. Property Rights
The issuance of this permit does not convey any property rights in either real or personal property, or any exclusive
privileges,nor does it authorize any injury to private property or any invasion of personal rights,nor any
infringement of Federal, State or local laws or regulations[40 CFR 122.41(g)].
6. Onshore or Offshore Construction
This permit does not authorize or approve the construction of any onshore or offshore physical structures or
facilities or the undertaking of any work in any navigable waters.
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 5of18
7. Severability
The provisions of this permit are severable. If any provision of this permit, or the application of any provision of
this permit to any circumstances, is held invalid,the application of such provision to other circumstances,and the
remainder of this permit, shall not be affected thereby[NCGS 150B-23].
8. Duty to Provide Information
The Permittee shall furnish to the Permit Issuing Authority,within a reasonable time, any information which the
Permit Issuing Authority may request to determine whether cause exists for modifying,revoking and reissuing,or
terminating this permit or to determine compliance with this permit.The Permittee shall also furnish to the Permit
Issuing Authority upon request,copies of records required by this permit[40 CFR 122.41(h)].
9. Duty to Reapply
If the Permittee wishes to continue an activity regulated by this permit after the expiration date of this permit,the
Permittee must apply for and obtain a new permit[40 CFR 122.41(b)].
10. Expiration of Permit
The Permittee is not authorized to discharge after the expiration date. In order to receive automatic authorization to
discharge beyond the expiration date,the Permittee shall submit such information,forms,and fees as are required
by the agency authorized to issue permits no later than 180 days prior to the expiration date unless permission for a
later date has been granted by the Director. (The Director shall not grant permission for applications to be
submitted later than the expiration date of the existing permit.) [40 CFR 122.21(d)]Any Permittee that has not
requested renewal at least 180 days prior to expiration, or any Permittee that does not have a permit after the
expiration and has not requested renewal at least 180 days prior to expiration,will subject the Permittee to
enforcement procedures as provided in NCGS 143-215.6 and 33 USC 1251 et. seq.
11. Signatory Requirements
All applications,reports,or information submitted to the Permit Issuing Authority shall be signed and certified[40
CFR 122.41(k)].
a. All permit applications shall be signed as follows:
1) For a corporation: by a responsible corporate officer. For the purpose of this Section,a responsible
corporate officer means: (a)a president,secretary, treasurer or vice president of the corporation in charge
of a principal business function,or any other person who performs similar policy or decision making
functions for the corporation, or(b)the manager of one or more manufacturing,production,or operating
facilities,provided,the manager is authorized to make management decisions which govern the operation
of the regulated facility including having the explicit or implicit duty of making major capital investment
recommendations,and initiating and directing other comprehensive measures to assure long term
environmental compliance with environmental laws and regulations;the manager can ensure that the
necessary systems are established or actions taken to gather complete and accurate information for permit
application requirements; and where authority to sign documents has been assigned or delegated to the
manager in accordance with corporate procedures .
2) For a partnership or sole proprietorship: by a general partner or the proprietor,respectively; or
3) For a municipality, State,Federal,or other public agency: by either a principal executive officer or
ranking elected official [40 CFR 122.22].
b. All reports required by the permit and other mfonnation requested by the Permit Issuing Authority shall be
signed by a person described in paragraph a. above or by a duly authorized representative of that person.A
person is a duly authorized representative only if:
1) The authorization is made in writing by a person described above;
2) The authorization specified either an individual or a position having responsibility for the overall operation
of the regulated facility or activity, such as the position of plant manager, operator of a well or well field,
superintendent, a position of equivalent responsibility, or an individual or position having overall
responsibility for environmental matters for the company. (A duly authorized representative may thus be
either a named individual or any individual occupying a named position.); and
3) The written authorization is submitted to the Permit Issuing Authority[40 CFR 122.22]
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 6 of 18
c. Changes to authorization: If an authorization under paragraph(b)of this section is no longer accurate because
a different individual or position has responsibility for the overall operation of the facility, a new authorization
satisfying the requirements of paragraph(b)of this section must be submitted to the Director prior to or
together with any reports,information, or applications to be signed by an authorized representative[40 CFR
122.22]
d. Certification.Any person signing a document under paragraphs a. or b. of this section shall make the following
certification[40 CFR 122.22].NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED:
I cert, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted.Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete.I am aware that there are significant penalties for
submitting false information, including the possibility offines and imprisonment for knowing violations."
12. Permit Actions
This permit may be modified,revoked and reissued, or terminated for cause. The filing of a request by the
Permittee for a permit modification,revocation and reissuance,or termination,or a notification of planned changes
or anticipated noncompliance does not stay any permit condition[40 CFR 122.41(f)].
13. Permit Modification,Revocation and Reissuance,or Termination
The issuance of this permit does not prohibit the permit issuing authority from reopening and modifying the permit,
revoking and reissuing the permit,or terminating the permit as allowed by the laws,rules, and regulations
contained in Title 40, Code of Federal Regulations,Parts 122 and 123;Title 15A of the North Carolina
Administrative Code, Subchapter 02H.0100; and North Carolina General Statute 143.215.1 et. al.
14. Annual Administering and Compliance Monitoring Fee Requirements
The Permittee must pay the annual administering and compliance monitoring fee within thirty days after being
billed by the Division. Failure to pay the fee in a timely manner in accordance with 15A NCAC 02H .0105(b)(2)
may cause this Division to initiate action to revoke the permit.
Section C. Operation and Maintenance of Pollution Controls
1. Certified Operator
Owners of classified water pollution control systems must designate operators, certified by the Water Pollution
Control System Operators Certification Commission(WPCSOCC),of the appropriate type and grade for the
system,and,for each classification must[T15A NCAC 08G .0201]:
a. designate one Operator In Responsible Charge(ORC)who possesses a valid certificate of the type and grade at
least equivalent to the type and grade of the system;
b. designate one or more Back-up Operator(s)in Responsible Charge(Back-up ORCs)who possesses a valid
certificate of the type of the system and no more than one grade less than the grade of the system,with the
exception of no backup operator in responsible charge is required for systems whose minimum visitation
requirements are twice per year; and
c. submit a signed completed"Water Pollution Control System Operator Designation Form"to the Commission
or to the local health department for owners of subsurface systems)countersigned by the designated certified
operators,designating the Operator m Responsible Charge(ORC)and the Back-up Operator in Responsible
Charge(Back-up ORC):
1) 60 calendar days prior to wastewater or residuals being introduced into a new system;or
2) within 120 calendar days following:
receiving notification of a change in the classification of the system requiring the designation of a new
Operator in Responsible Charge(ORC)and Back-up Operator in Responsible Charge(Back-up ORC)
of the proper type and grade;or
a vacancy in the position of Operator in Responsible Charge(ORC)or Back-up Operator in
Responsible Charge(Back-up ORC).
Version 11/09/2011 1
NPDES Permit Standard Conditions
Page 7 of 18
3) within seven calendar days of vacancies in both ORC and Back-up ORC positions replacing or designating
at least one of the responsibilities.
The ORC of each Class I facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
Visit the facility as often as is necessary to insure proper operation of the treatment system; the treatment
facility must be visited at least weekly
Comply with all other conditions of 15A NCAC 08G .0204.
The ORC of each Class II,III and IV facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
Visit the facility as often as is necessary to insure proper operation of the treatment system; the treatment
facility must be visited at least five days per week, excluding holidays
Properly manage and document daily operation and maintenance of the facility
Comply with all other conditions of 15A NCAC 08G .0204.
2. Proper Operation and Maintenance
The Permittee shall at all times properly operate and maintain all facilities and systems of treatment and control
and related appurtenances)which are installed or used by the Peiuuttee to achieve compliance with the conditions
of this permit.Proper operation and maintenance also includes adequate laboratory controls and appropriate quality
assurance procedures.This provision requires the Permittee to install and operate backup or auxiliary facilities only
when necessary to achieve compliance with the conditions of the permit[40 CFR 122.41(e)].
NOTE: Properly and officially designated operators are fully responsible for all proper operation and maintenance
of the facility, and all documentation required thereof,whether acting as a contract operator[subcontractor] or a
member of the Permittee's staff.
3. Need to Halt or Reduce not a Defense
It shall not be a defense for a Permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity m order to maintain compliance with the condition of this permit[40 CFR 122.41(c)].
4. Bypassing of Treatment Facilities
a. Bypass not exceeding limitations [40 CFR 122.41(m)(2)]
The Permittee may allow any bypass to occur which does not cause effluent limitations to be exceeded,but
only if it also is for essential maintenance to assure efficient operation. These bypasses are not subject to the
provisions of Paragraphs b. and c. of this section.
b. Notice [40 CFR 122.41(m)(3)]
1) Anticipated bypass.If the Permittee knows in advance of the need for a bypass, it shall submit prior notice,
if possible at least ten days before the date of the bypass; including an evaluation of the anticipated quality
and effect of the bypass.
2) Unanticipated bypass. The Permittee shall submit notice of an unanticipated bypass as required in Part
II.E.6. (24-hour notice).
c. Prohibition of Bypass
1) Bypass from the treatment facility is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for bypass,unless:
A) Bypass was unavoidable to prevent loss of life,personal injury or severe property damage;
B) There were no feasible alternatives to the bypass,such as the use of auxiliary treatment facilities,
retention of untreated wastes or maintenance during normal periods of equipment downtime. This
condition is not satisfied if adequate backup equipment should have been installed in the exercise of
reasonable engineering judgment to prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
C) The Permittee submitted notices as required under Paragraph b. of this section.
2) Bypass from the collection system is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for a bypass as provided in any current or future system-wide collection system
permit associated with the treatment facility.
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 8 of 18
3) The Permit Issuing Authority may approve an anticipated bypass, after considering its adverse effects,if
the Permit Issuing Authority determines that it will meet the three conditions listed above in Paragraph c.
1)of this section.
5. Upsets
a. Effect of an upset[40 CFR 122.41(n)(2)]: An upset constitutes an affirmative defense to an action brought for
noncompliance with such technology based permit effluent limitations if the requirements of paragraph b. of
this condition are met.No determination made during administrative review of claims that noncompliance was
caused by upset,and before an action for noncompliance,is fmal administrative action subject to judicial
review.
b. Conditions necessary for a demonstration of upset:Any Permittee who wishes to establish the affirmative
defense of upset shall demonstrate,through properly signed,contemporaneous operating logs,or other relevant
evidence that:
1)An upset occurred and that the Permittee can identify the cause(s)of the upset;
2)The Permittee facility was at the time being properly operated; and
3)The Permittee submitted notice of the upset as required in Part II.E.6.(b)of this permit.
4)The Permittee complied with any remedial measures required under Part II.B.2. of this permit.
c. Burden of proof[40 CFR 122.41(n)(4)]: The Penuiittee seeking to establish the occurrence of an upset has
the burden of proof in any enforcement proceeding.
6. Removed Substances
Solids,sludges,filter backwash,or other pollutants removed in the course of treatment or control of wastewaters
shall be utilized/disposed of in accordance with NCGS 143-215.1 and in a manner such as to prevent any pollutant
from such materials from entering waters of the State or navigable waters of the United States except as permitted
by the Commission. The Permittee shall comply with all applicable state and Federal regulations governing the
disposal of sewage sludge,including 40 CFR 503, Standards for the Use and Disposal of Sewage Sludge;40 CFR
Part 258,Criteria For Municipal Solid Waste Landfills;and 15A NCAC Subchapter 2T,Waste Not Discharged To
Surface Waters.The Permittee shall notify the Permit Issuing Authority of any significant change in its sludge use
or disposal practices.
7. Power Failures
The Permittee is responsible for maintaining adequate safeguards(as required by 15A NCAC 02H.0124)to
prevent the discharge of untreated or inadequately treated wastes during electrical power failures either by means
of alternate power sources,standby generators or retention of inadequately treated effluent.
Section D. Monitoring and Records
1. Representative Sampling
Samples collected and measurements taken, as required herein, shall be representative of the permitted discharge.
Samples collected at a frequency less than daily shall be taken on a day and time that is representative of the
discharge for the period the sample represents.All samples shall be taken at the monitoring points specified in this
permit and,unless otherwise specified,before the effluent joins or is diluted by any other wastestream,body of
water,or substance. Monitoring points shall not be changed without notification to and the approval of the Permit
Issuing Authority[40 CFR 122.41(j)].
2. Reporting
Monitoring results obtained during the previous month(s)shall be summarized for each month and reported on a
monthly Discharge Monitoring Report(DMR)Form(MR 1, 1.1,2,3)or alternative forms approved by the
Director,postmarked no later than the last calendar day of the month following the completed reporting period.
The first DMR is due on the last day of the month following the issuance of the permit or in the case of a new
facility, on the last day of the month following the commencement of discharge.Duplicate signed copies of these,
and all other reports required herein, shall be submitted to the following address:
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 9 of 18
NC DENR/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
3. Flow Measurements
Appropriate flow measurement devices and methods consistent with accepted scientific practices shall be selected
and used to ensure the accuracy and reliability of measurements of the volume of monitored discharges.The
devices shall be installed, calibrated and maintained to ensure that the accuracy of the measurements is consistent
with the accepted capability of that type of device. Devices selected shall be capable of measuring flows with a
maximum deviation of less than 10%from the true discharge rates throughout the range of expected discharge
volumes. Flow measurement devices shall be accurately calibrated at a minimum of once per year and maintained
to ensure that the accuracy of the measurements is consistent with the accepted capability of that type of device.
The Director shall approve the flow measurement device and monitoring location prior to installation.
Once-through condenser cooling water flow monitored by pump logs, or pump hour meters as specified in Part I of
this permit and based on the manufacturer's pump curves shall not be subject to this requirement.
4. Test Procedures
Laboratories used for sample analysis must be certified by the Division. Permittees should contact the Division's
Laboratory Certification Section(919 733-3908 or http://portal.ncdenr.org/web/wq/lab/cert)for information
regarding laboratory certifications.
Facilities whose personnel are conducting testing of field-certified parameters only must hold the appropriate field
parameter laboratory certifications.
Test procedures for the analysis of pollutants shall conform to the EMC regulations(published pursuant to NCGS
143-215.63 et. seq.),the Water and Air Quality Reporting Acts,and to regulations published pursuant to Section
304(g), 33 USC 1314,of the CWA(as amended), and 40 CFR 136; or in the case of sludge use or disposal,
approved under 40 CFR 136,unless otherwise specified in 40 CFR 503,unless other test procedures have been
specified in this permit[40 CFR 122.41].
To meet the intent of the monitoring required by this permit,all test procedures must produce minimum detection
and reporting levels that are below the permit discharge requirements and all data generated must be reported down
to the minimum detection or lower reporting level of the procedure. If no approved methods are determined
capable of achieving minimum detection and reporting levels below permit discharge requirements,then the most
sensitive(method with the lowest possible detection and reporting level)approved method must be used.
5. Penalties for Tampering
The CWA provides that any person who falsifies,tampers with, or knowingly renders inaccurate,any monitoring
device or method required to be maintained under this permit shall,upon conviction,be punished by a fine of not
more than$10,000 per violation,or by imprisonment for not more than two years per violation, or by both.If a
conviction of a person is for a violation committed after a first conviction of such person under this paragraph,
punishment is a fine of not more than$20,000 per day of violation,or by imprisonment of not more than 4 years,
or both [40 CFR 122.41].
6. Records Retention
Except for records of monitoring information required by this permit related to the Permittee's sewage sludge use
and disposal activities,which shall be retained for a period of at least five years(or longer as required by 40 CFR
503),the Permittee shall retain records of all monitoring information,including:
all calibration and maintenance records
all original strip chart recordings for continuous monitoring instrumentation
copies of all reports required by this permit
copies of all data used to complete the application for this permit
These records or copies shall be maintained for a period of at least 3 years from the date of the sample,
measurement,report or application.This period may be extended by request of the Director at any time[40 CFR
122.41].
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 10 of 18
7. Recording Results
For each measurement or sample taken pursuant to the requirements of this permit,the Permittee shall record the
following information[40 CFR 122.41]:
a. The date,exact place,and time of sampling or measurements;
b. The individual(s)who performed the sampling or measurements;
c. The date(s)analyses were performed;
d. The individual(s)who performed the analyses;
e. The analytical techniques or methods used;and
f. The results of such analyses.
8. Inspection and Entry
The Permittee shall allow the Director,or an authorized representative(including an authorized contractor acting as
a representative of the Director),upon the presentation of credentials and other documents as may be required by
law,to;
a. Enter,at reasonable times,upon the Permittee's premises where a regulated facility or activity is located or
conducted, or where records must be kept under the conditions of this permit;
b. Have access to and copy,at reasonable times, any records that must be kept under the conditions of this permit;
c. Inspect at reasonable times any facilities, equipment(including monitoring and control equipment),practices,
or operations regulated or required under this permit; and
d. Sample or monitor at reasonable times,for the purposes of assuring permit compliance or as otherwise
authorized by the CWA,any substances or parameters at any location[40 CFR 122.41(i)].
Section E Reporting Requirements
1. Change in Discharge
All discharges authorized herein shall be consistent with the terms and conditions of this permit.The discharge of
any pollutant identified in this permit more frequently than or at a level in excess of that authorized shall constitute
a violation of the permit.
2. Planned Changes
The Permittee shall give notice to the Director as soon as possible of any planned physical alterations or additions
to the permitted facility[40 CFR 122.41(1)].Notice is required only when:
a. The alteration or addition to a permitted facility may meet one of the criteria for new sources at 40 CFR
122.29(b); or
b. The alteration or addition could significantly change the nature or increase the quantity of pollutants
discharged.This notification applies to pollutants subject neither to effluent limitations in the permit,nor to
notification requirements under 40 CFR 122.42(a)(1);or
c. The alteration or addition results in a significant change in the Permittee's sludge use or disposal practices, and
such alteration,addition or change may justify the application of permit conditions that are different from or
absent in the existing permit,including notification of additional use or disposal sites not reported during the
permit application process or not reported pursuant to an approved land application plan.
3. Anticipated Noncompliance
The Permittee shall give advance notice to the Director of any planned changes to the permitted facility or other
activities that might result in noncompliance with the permit[40 CFR 122.41(1)(2)].
4. Transfers
This permit is not transferable to any person without prior written notice to and approval from the Director in
accordance with 40 CFR 122.61. The Director may condition approval in accordance with NCGS 143-215.1,in
particular NCGS 143-215.1(b)(4)b.2.,and may require modification or revocation and reissuance of the permit,or
a minor modification,to identify the new permittee and incorporate such other requirements as may be necessary
under the CWA[40 CFR 122.41(1)(3), 122.61] or state statute.
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 11 of 18
5. Monitoring Reports
Monitoring results shall be reported at the intervals specified elsewhere in this permit[40 CFR 122.41(1)(4)].
a. Monitoring results must be reported on a Discharge Monitoring Report(DMR) (See Part II.D.2)or forms
provided by the Director for reporting results of monitoring of sludge use or disposal practices.
b. If the Permittee monitors any pollutant more frequently than required by this permit using test procedures
approved under 40 CFR Part 136 and at a sampling location specified in this permit or other appropriate
instrument governing the discharge,the results of such monitoring shall be included in the calculation and
reporting of the data submitted on the DMR.
6. Twenty-four Hour Reporting
a. The Permittee shall report to the Director or the appropriate Regional Office any noncompliance that
potentially threatens public health or the environment.Any information shall be provided orally within 24
hours from the time the Permittee became aware of the circumstances.A written submission shall also be
provided within 5 days of the time the Permittee becomes aware of the circumstances. The written submission
shall contain a description of the noncompliance,and its cause;the period of noncompliance,including exact
dates and times, and if the noncompliance has not been corrected,the anticipated time it is expected to
continue;and steps taken or planned to reduce, eliminate,and prevent reoccurrence of the noncompliance [40
CFR 122.41(1)(6)].
b. The Director may waive the written report on a case-by-case basis for reports under this section if the oral
report has been received within 24 hours.
c. Occurrences outside normal business hours may also be reported to the Division's Emergency Response
personnel at(800) 662-7956,[phone] or(919)733-3300.
7. Other Noncompliance
The Permittee shall report all instances of noncompliance not reported under Part II.E.5 and 6. of this permit at the
time monitoring reports are submitted.The reports shall contain the information listed in Part II.E.6. of this permit
40 CFR 122.41(1)(7)].
8. Other Information
Where the Permittee becomes aware that it failed to submit any relevant facts in a permit application,or submitted
incorrect information in a permit application or in any report to the Director,it shall promptly submit such facts or
information[40 CFR 122.41(1)(8)].
9. Noncompliance Notification
The Permittee shall report by telephone to either the central office or the appropriate regional office of the Division
as soon as possible,but in no case more than 24 hours or on the next working day following the occurrence or first
knowledge of the occurrence of any of the following:
a. Any occurrence at the water pollution control facility which results in the discharge of significant amounts of
wastes which are abnormal m quantity or characteristic, such as the dumping of the contents of a sludge
digester;the known passage of a slug of hazardous substance through the facility; or any other unusual
circumstances.
b. Any process unit failure, due to known or unknown reasons,that render the facility incapable of adequate
wastewater treatment such as mechanical or electrical failures of pumps, aerators,compressors,etc.
c. Any failure of a pumping station, sewer line,or treatment facility resulting in a by-pass without treatment of all
or any portion of the influent to such station or facility.
Persons reporting such occurrences by telephone shall also file a written report within 5 days following first
knowledge of the occurrence.Also see reporting requirements for municipalities in Part IV.C.2.c. of this permit.
10. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3 (a)(2)or Section 308 of the Federal Act,33
USC 1318,all reports prepared in accordance with the terms shall be available for public inspection at the offices
of the Division.As required by the Act, effluent data shall not be considered confidential.Knowingly making any
false statement on any such report may result in the imposition of criminal penalties as provided for in NCGS 143-
215.1(b)(2)or in Section 309 of the Federal Act.
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 12 of 18
11. Penalties for Falsification of Reports
The CWA provides that any person who knowingly makes any false statement,representation,or certification in
any record or other document submitted or required to be maintained under this permit,including monitoring
reports or reports of compliance or noncompliance shall,upon conviction,be punished by a fine of not more than
25,000 per violation,or by imprisonment for not more than two years per violation,or by both[40 CFR 122.41].
12. Annual Performance Reports
Permittees who own or operate facilities that primarily collect or treat municipal or domestic wastewater and have
an average annual flow greater than 200,000 gallons per day shall provide an annual report to the Permit Issuing
Authority and to the users/customers served by the Permittee(NCGS 143-215.1C). The report shall summarize the
performance of the collection or treatment system,as well as the extent to which the facility was compliant with
applicable Federal or State laws,regulations and rules pertaining to water quality.The report shall be provided no
later than sixty days after the end of the calendar or fiscal year,depending upon which annual period is used for
evaluation.
The report shall be sent to:
NC DENR/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 13of18
PART III
OTHER REQUIREMENTS
Section A. Construction
a. The Permittee shall not commence construction of wastewater treatment facilities,nor add to the plant's treatment
capacity,nor change the treatment process(es)utilized at the treatment plant unless(1)the Division has issued an
Authorization to Construct(AtC)permit or(2)the Permittee is exempted from such AtC permit requirements
under Item b. of this Section.
b. In accordance with NCGS 143-215.1(a5) [SL 2011-394],no permit shall be required to enter into a contract for the
construction,installation, or alteration of any treatment work or disposal system or to construct,install, or alter any
treatment works or disposal system within the State when the system's or work's principle function is to conduct,
treat, equalize,neutralize,stabilize,recycle, or dispose of industrial waste or sewage from an industrial facility and
the discharge of the industrial waste or sewage is authorized under a permit issued for the discharge of the
industrial waste or sewage into the waters of the State. Notwithstanding the above,the permit issued for the
discharge may be modified if required by federal regulation.
c. Issuance of an AtC will not occur until Final Plans and Specifications for the proposed construction have been
submitted by the Permittee and approved by the Division.
Section B. Groundwater Monitoring
The Permittee shall,upon written notice from the Director, conduct groundwater monitoring as may be required to
determine the compliance of this NPDES permitted facility with the current groundwater standards.
Section C. Changes in Discharges of Toxic Substances
The Permittee shall notify the Permit Issuing Authority as soon as it knows or has reason to believe(40 CFR 122.42):
a. That any activity has occurred or will occur which would result in the discharge, on a routine or frequent basis,of
any toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the following
notification levels";
1) One hundred micrograms per liter(100 µg/L);
2) Two hundred micrograms per liter(200 µg/L)for acrolein and acrylonitrile;five hundred micrograms per liter
500 µg/L) for 2,4-dinitrophenol and for 2-methyl-4,6-dinitrophenol; and one milligram per liter(1 mg/L)for
antimony;
3) Five times the maximum concentration value reported for that pollutant in the permit application.
b. That any activity has occurred or will occur which would result in any discharge, on a non-routine or infrequent
basis, of a toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the
following "notification levels";
1) Five hundred micrograms per liter(500 µg/L);
2) One milligram per liter(1 mg/L)for antimony;
3) Ten times the maximum concentration value reported for that pollutant in the permit application.
Section D. Facility Closure Requirements
The Permittee must notify the Division at least 90 days prior to the closure of any wastewater treatment system covered
by this permit. The Division may require specific measures during deactivation of the system to prevent adverse
impacts to waters of the State. This permit cannot be rescinded while any activities requiring this permit continue at the
permitted facility.
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 14 of 18
PART IV
SPECIAL CONDITIONS FOR MUNICIPAL FACILITIES
Section A. Definitions
In addition to the definitions in Part II of this permit,the following defmitions apply to municipal facilities:
Indirect Discharge or Industrial User
Any non-domestic source that discharges wastewater containing pollutants into a POTW regulated under section
307(b), (c)or(d)of the CWA. [40 CFR 403.3 (i)and(j)and 15A NCAC 02H.0903(b)(11)]
Interference
Inhibition or disruption of the POTW treatment processes; operations; or its sludge process,use, or disposal which
causes or contributes to a violation of any requirement of the Permittee's (or any satellite POTW's if different from the
Permittee)NPDES,collection system,or non-discharge permit or prevents sewage sludge use or disposal in
compliance with specified applicable State and Federal statutes,regulations,or permits. [15A NCAC 02H
0903(b)(14)]
Pass Through
A discharge which exits the POTW into waters of the State in quantities or concentrations which, alone or with
discharges from other sources, causes a violation,including an increase in the magnitude or duration of a violation,of
the Permittee's(or any satellite POTW's,if different from the Permittee)NPDES, collection system,or non-discharge
permit. [15A NCAC 02H.0903(b)(23)]
Publicly Owned Treatment Works (POTW)
A treatment works as defmed by Section 212 of the CWA,which is owned by a State or local government organization.
This definition includes any devices and systems used in the storage,treatment,recycling and reclamation of municipal
sewage or industrial wastes of a liquid nature. It also includes the collection system, as defined in 15A NCAC 2T
0402,only if it conveys wastewater to a POTW treatment plant. The term also means the local government
organization,or municipality,as defmed in section 502(4)of the CWA,which has jurisdiction over indirect discharges
to and the discharges from such a treatment works.In this context,the organization maybe the owner of the POTW
treatment plant or the owner of the collection system into which an indirect discharger discharges. This second type of
POTW may be referred to as a"satellite POTW organization." [15A NCAC 02H.0903(b)(26)]
Significant Industrial User" or"SIU"
An Industrial User that discharges wastewater into a publicly owned treatment works and that[15A NCAC 02H
0903(b)(33)]:
1. Discharges an average of 25,000 gallons per day or more of process wastewater to the POTW(excluding sanitary,
noncontact cooling and boiler blowdown wastewaters); or
2. Contributes process wastewater which makes up five percent or more of the NPDES or non-discharge permitted
flow limit or organic capacity of the POTW treatment plant.In this context, organic capacity refers to BOD,TSS
and ammonia;or
3. Is subject to categorical standards under 40 CFR Part 403.6 and 40 CFR Parts 405-471; or
4. Is designated as such by the Permittee on the basis that the Industrial User has a reasonable potential for adversely
affecting the POTW's operation or for violating any pretreatment standard or requirement,or the POTW's effluent
limitations and conditions in its NPDES or non-discharge permit, or to limit the POTW's sludge disposal options;
5. Subject to approval under 15A NCAC 02H.0907(b),the Permittee may determine that an Industrial User meeting
the criteria in paragraphs 1 or 2 of this defmition above has no reasonable potential for adversely affecting the
POTW's operation or for violating any pretreatment standard or requirement,the POTW's effluent limitations and
conditions in its NPDES or non-discharge permit,or to limit the POTW's sludge disposal options,and thus is not a
Significant Industrial User(SIU);or
6. Subject to approval under 15A NCAC 02H .0907(b),the Permittee may determine that an Industrial User meeting
the criteria in paragraph 3 of this definition above meets the requirements of 40 CFR Part 403.3(v)(2)and thus is a
non-significant categorical Industrial User.
Section B. Publicly Owned Treatment Works(POTWs)
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 15 of 18
All POTWs must provide adequate notice to the Director of the following[40 CFR 122.42(b)]:
1. Any new introduction of pollutants into the POTW from an indirect discharger,regardless of the means of
transport,which would be subject to section 301 or 306 of CWA if it were directly discharging those pollutants;
and
2. Any substantial change in the volume or character of pollutants being introduced by an indirect discharger as
influent to that POTW at the time of issuance of the permit.
3. For purposes of this paragraph,adequate notice shall include information on(1)the quality and quantity of effluent
introduced into the POTW,and(2)any anticipated impact that may result from the change of the quantity or
quality of effluent to be discharged from the POTW.
Section C. Municipal Control of Pollutants from Industrial Users.
1. Effluent limitations are listed in Part I of this permit. Other pollutants attributable to inputs from Industrial Users
discharging to the POTW may be present in the Permittee's discharge.At such time as sufficient information
becomes available to establish limitations for such pollutants,this permit may be revised to specify effluent
limitations for any or all of such other pollutants in accordance with best practicable technology or water quality
standards.
2. Prohibited Discharges
a. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibition against the
introduction of pollutants or discharges into the waste treatment system or waste collection system which
cause or contribute to Pass Through or Interference as defined in 15A NCAC 02H.0900 and 40 CFR 403. [40
CFR 403.5(a)(1)]
b. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibitions against the
introduction of the following wastes in the waste treatment or waste collection system[40 CFR 403.5(b)]:
1) Pollutants which create a fire or explosion hazard in the POTW,including,but not limited to,
wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Centigrade
using the test methods specified in 40 CFR 261.21;
2) Pollutants which cause corrosive structural damage to the POTW,but in no case discharges with pH lower
than 5.0,unless the works is specifically designed to accommodate such discharges;
3) Solid or viscous pollutants in amounts which cause obstruction to the flow in the POTW resulting in
Interference;
4) Any pollutant, including oxygen demanding pollutants(BOD,etc.)released in a Discharge at a flow rate
and/or pollutant concentration which will cause Interference with the POTW;
5) Heat in amounts which will inhibit biological activity in the POTW resulting in Interference,but in no
case heat in such quantities that the temperature at the POTW Treatment Plant exceeds 40°C(104°F)
unless the Division,upon request of the POTW,approves alternate temperature limits;
6) Petroleum oil,non-biodegradable cutting oil,or products of mineral oil origin in amounts that will cause
Interference or Pass Through;
7) Pollutants which result in the presence of toxic gases,vapors,or fumes within the POTW in a quantity that
may cause acute worker health and safety problems; or
8) Any trucked or hauled pollutants,except at discharge points designated by the POTW.
c. The Permittee shall investigate the source of all discharges into the POTW,including slug loads and other
unusual discharges,which have the potential to adversely impact the Permittee's Pretreatment Program and/or
the operation of the POTW.
The Permittee shall report such discharges into the POTW to the Director or the appropriate Regional Office.
Any information shall be provided orally within 24 hours from the time the Permittee became aware of the
circumstances.A written submission shall also be provided within 5 days of the time the Permittee becomes
aware of the circumstances. The written submission shall contain a description of the discharge; the
investigation into possible sources; the period of the discharge,including exact dates and times;if the
discharge has not ceased,the anticipated time it is expected to continue;and steps taken or planned to reduce,
eliminate,and prevent reoccurrence of the noncompliance,
Version 11/09/2011.1
NPDES Permit Standard Conditions
4
Page 16 of 18
3. With regard to the effluent requirements listed in Part I of this permit,it may be necessary for the Permittee to
supplement the requirements of the Federal Pretreatment Standards(40 CFR,Part 403)to ensure compliance by
the Permittee with all applicable effluent limitations. Such actions by the Permittee may be necessary regarding
some or all of the industries discharging to the municipal system.
4. The Permittee shall require any Industrial User(IU)discharging to the POTW to meet Federal Pretreatment
Standards developed under Section 307(b)of the Act as amended(which includes categorical standards and
specific local limits,best management practices and narrative requirements).Prior to accepting wastewater from
any Significant Industrial User(SIU),the Permittee shall either develop and submit to the Division a new
Pretreatment Program or,as necessary,a modification of an existing Pretreatment Program, for approval as
required under section D below as well as 15A NCAC 02H .0907(a)and(b). [40 CFR 122.44(j)(2)]
5. This permit shall be modified,or alternatively,revoked and reissued,to incorporate or modify an approved POTW
Pretreatment Program or to include a compliance schedule for the development of a POTW Pretreatment Program
as required under Section 402 (b)(8)of the CWA and implementing regulations or by the requirements of the
approved State pretreatment program,as appropriate.
Section D. Pretreatment Programs
Under authority of sections 307(b)and(c)and 402(b)(8)of the CWA and implementing regulations 40 CFR 403,
North Carolina General Statute 143-215.3(14)and implementing regulations 15A NCAC 02H .0900,and in accordance
with the approved pretreatment program,all provisions and regulations contained and referenced m the pretreatment
program submittal are an enforceable part of this permit. [40 CFR 122.44(j)(2)]
The Permittee shall operate its approved pretreatment program in accordance with Section 402(b)(8)of the CWA,40
CFR 403, 15A NCAC 02H.0900, and the legal authorities,policies,procedures,and financial provisions contained in
its pretreatment program submission and Division approved modifications thereof. Such operation shall include but is
not limited to the implementation of the following conditions and requirements.Terms not defined in Part II or Part IV
of this permit are as defined in 15A NCAC 02H.0903 and 40 CFR 403.3.
1. Sewer Use Ordinance(SUO)
The Permittee shall maintain adequate legal authority to implement its approved pretreatment program. [15A
NCAC 02H.0903(b)(32), .0905 and.0906(b)(1);40 CFR 403.8(f)(1)and 403.9(b)(1)and(2)]
2. Industrial Waste Survey(IWS)
The Permittee shall implement an IWS consisting of the survey of users of the POTW collection system or
treatment plant,as required by 40 CFR 403.8(f)(2)(i-iii)and 15A NCAC 02H.0905 [also 40 CFR 122.44(j)(1)],
including identification of all Industrial Users that may have an impact on the POTW and the character and amount
of pollutants contributed to the POTW by these Industrial Users and identification of those Industrial Users
meeting the definition of SIU.Where the Permittee accepts wastewater from one or more satellite POTWs,the
IWS for the Permittee shall address all satellite POTW services areas,unless the pretreatment program in those
satellite service areas is administered by a separate Permittee with an approved Pretreatment Program. The
Permittee shall submit a summary of its IWS activities to the Division at least once every five years,and as
required by the Division. The IWS submission shall include a summary of any investigations conducted under
paragraph C.2.c. of this Part. [15A NCAC 02H .0903(b)(13), .0905 and.0906(b)(2);40 CFR 403.8(f)(2)and 403.9]
3. Monitoring Plan
The Permittee shall implement a Division-approved Monitoring Plan for the collection of facility specific data to
be used in a wastewater treatment plant Headworks Analysis(HWA)for the development of specific pretreatment
local limits. Effluent data from the Plan shall be reported on the DMRs(as required by Parts II.D and II.E.5.). [15A
NCAC 02H.0903(b)(16), .0906(b)(3)and.0905]
4. Headworks Analysis(HWA)and Local Limits
The Permittee shall obtain Division approval of a HWA at least once every five years, and as required by the
Division. Within 180 days of the effective date of this permit(or any subsequent permit modification)the
Permittee shall submit to the Division a written technical evaluation of the need to revise local limits (i.e.,an
updated HWA or documentation of why one is not needed) [40 CFR 122.44]. The Permittee shall develop, in
accordance with 40 CFR 403.5(c) and 15A NCAC 02H .0909, specific Local Limits to implement the prohibitions
listed in 40 CFR 403.5(a)and(b)and 15A NCAC 02H .0909.Pursuant to 40 CFR 403.5,local limits are
Version 11/09/2011 1
NPDES Permit Standard Conditions
Page 17 of 18
enforceable Pretreatment Standards as defined by 40 CFR 403.3(1). [15A NCAC 02H.0903(b)(10), .0905,and
0906(b)(4)]
5. Industrial User Pretreatment Permits(IUP)&Allocation Tables
In accordance with NCGS,143-215.1,the Permittee shall issue to all Significant Industrial Users,permits for
operation of pretreatment equipment and discharge to the Permittee's collection system or treatment works.These
permits shall contain limitations, sampling protocols,reporting requirements,appropriate standard and special
conditions,and compliance schedules as necessary for the installation of treatment and control technologies to
assure that their wastewater discharge will meet all applicable pretreatment standards and requirements. The
Permittee shall maintain a current Allocation Table(AT)which summarizes the results of the HWA and the limits
from all IUPs.Permitted IUP loadings for each parameter cannot exceed the treatment capacity of the POTW as
determined by the HWA. [15A NCAC 02H.0906(b)(6), .0909, .0916,and.0917;40 CFR 403.5,403.8(f)(1)(iii);
NCGS 143-215.67(a)]
6. Authorization to Construct(AtC)
The Permittee shall ensure that an Authonzation to Construct permit(AtC)is issued to all applicable Industrial
Users for the construction or modification of any pretreatment facility.Prior to the issuance of an AtC,the
proposed pretreatment facility and treatment process must be evaluated for its capacity to comply with all
Industrial User Pretreatment Permit(IUP)limitations. [15A NCAC 02H.0906(b)(7) and.0905;NCGS 143-
215.1(a)(8)]
7. POTW Inspection&Monitoring of their IUs
The Permittee shall conduct inspection,surveillance,and monitoring activities as described in its Division
approved pretreatment program in order to determine,independent of information supplied by Industrial Users,
compliance with applicable pretreatment standards. [15A NCAC 02H.0908(e);40 CFR 403.8(f)(2)(v)] The
Permittee must:
a. Inspect all Significant Industrial Users(SIUs)at least once per calendar year;
b. Sample all Significant Industrial Users(SIUs)at least once per calendar year for all SIU permit-limited
parameters including:flow except as allowed under 15A NCAC .0908(e); and
c. At least once per year,document an evaluation of any non-significant categorical Industrial User for
compliance with the requirements in 40 CFR 403.3(v)(2),and either continue or revoke the designation as non-
significant.
8. IU Self Monitoring and Reporting
The Permittee shall require all Industrial Users to comply with the applicable monitoring and reporting
requirements outlined m the Division-approved pretreatment program,the industry's pretreatment permit,or in 15A
NCAC 02H.0908. [15A NCAC 02H.0906(b)(5)and.0905;40 CFR 403.8(f)(1)(v)and(2)(iii);40 CFR
122.44(j)(2)and 40 CFR 403.12]
9. Enforcement Response Plan(ERP)
The Permittee shall enforce and obtain appropriate remedies for violations of all pretreatment standards
promulgated pursuant to section 307(b) and(c)of the CWA(40 CFR 405 et. seq.),prohibitive discharge standards
as set forth in 40 CFR 403.5 and 15A NCAC 02H.0909, specific local limitations,and other pretreatment
requirements.All remedies, enforcement actions and other, shall be consistent with the Enforcement Response
Plan(ERP) approved by the Division. [15A NCAC 02H.0903(b)(7), .0906(b)(8) and.0905;40 CFR 403.8(f)(5)]
10. Pretreatment Annual Reports (PAR)
The Permittee shall report to the Division in accordance with 15A NCAC 02H.0908. In lieu of submitting annual
reports,Modified Pretreatment Programs developed under 15A NCAC 02H.0904(b)may be required to submit a
partial annual report or to meet with Division personnel periodically to discuss enforcement of pretreatment
requirements and other pretreatment implementation issues.
For all other active pretreatment programs,the Permittee shall submit two copies of a Pretreatment Annual Report
PAR)describing its pretreatment activities over the previous calendar year to the Division at the following
address:
Version 11/09/2011.1
NPDES Permit Standard Conditions
Page 18of18
NC DENR/Division of Water Resources/Water Quality Permitting Section
Pretreatment,Emergency Response,and Collection Systems(PERCS)Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
These reports shall be submitted by March 1 of each year and shall contain the following:
a. Narrative
A narrative summary detailing actions taken,or proposed,by the Permittee to correct significant non-
compliance and to ensure compliance with pretreatment requirements;
b. Pretreatment Program Summary(PPS)
A pretreatment program summary(PPS)on forms or in a format provided by the Division;
c. Significant Non-Compliance Report(SNCR)
A list of Industrial Users(IUs)in significant noncompliance(SNC)with pretreatment requirements,and the
nature of the violations on forms or in a format provided by the Division;
d. Industrial Data Summary Forms(IDSF)
Monitoring data from samples collected by both the POTW and the Significant Industrial Users(SIUs). These
analytical results must be reported on Industrial Data Summary Forms(IDSF) or on other forms or in a format
provided by the Division;
e. Other Information
Copies of the POTW's allocation table,new or modified enforcement compliance schedules,public notice of
IUs in SNC, a summary of data or other information related to significant noncompliance determinations for
IUs that are not considered SIUs, and any other information,upon request,which in the opinion of the Director
is needed to determine compliance with the pretreatment implementation requirements of this permit;
11. Public Notice
The Permittee shall publish annually a list of Industrial Users(IUs)that were in significant noncompliance(SNC)
as defined in the Permittee's Division-approved Sewer Use Ordinance with applicable pretreatment requirements
and standards during the previous twelve month period.This list shall be published within four months of the
applicable twelve-month period. [15A NCAC 02H.0903(b)(34), .0908(b)(5)and.0905 and 40 CFR
403.8(f)(2)(viii)]
12. Record Keeping
The Permittee shall retain for a minimum of three years records of monitoring activities and results,along with
support information including general records,water quality records, and records of industrial impact on the
POTW and shall retain all other Pretreatment Program records as required by 15A NCAC 02H.0908(f). [15A
NCAC 02H.0908(f);40 CFR 403.12(o)]
13. Pretreatment Program Resources
The Permittee shall maintain adequate funding and qualified personnel to accomplish the objectives of its approved
pretreatment program. and retain a written description of those current levels of inspection. [15A NCAC 02H
0906(b)(9)and(10)and.0905;40 CFR 403.8(f)(3),403.9(b)(3)]
14. Modification to Pretreatment Programs
Modifications to the approved pretreatment program including but not limited to local limits modifications,POTW
monitoring of their Significant Industrial Users (SIUs),and Monitoring Plan modifications, shall be considered a
permit modification and shall be governed by 40 CFR 403.18, 15 NCAC 02H.0114 and 15A NCAC 02H.0907.
Version 11/09/2011.1
Table of Contents 

 Design Calculations  
Issue Date: Aug. 2019
TOC - 1

Section           Page 

I – Influent and Effluent Parameters  1 

II – Design Flow Rates  2 

III – Proposed Headworks  3 

IV – Aeration Basin  5 

V – Clarifier Splitter Box  7 

VI – Secondary Clarifiers  10 

VII – Proposed Chlorine Contact Chamber  12 

VIII – Effluent Pump Station  13 

IX – Proposed Disinfection/Dechlorination Feed  16 

X – Proposed RAS/WAS Pump Station  17 

XI – Plant Drain Pump Station  24 

XII – Proposed Plant Water Supply  28 

XII – Aerobic Sludge Digester  32 

Appendix  Page 

Appendix A  Geotechnical Engineering Report  35 

West Stanly WWTP
I. Influent and Effluent Parameters
Influent Values listed below are from DMRs from June ʹ16 to December ʹ18
Effluent Values listed below are based on NPDES Permit Requirements for Permit #NC0043532
Pollutant Influent Concentrations Effluent 
Average Max Monthly Average
Permitted Flow (MGD) 0.447 2.41 1.2
BOD5 (mg/L)10.0168 405
Fecal Coliform ‐‐200/100 mL
Total Suspended Solids (mg/L)181 883 30.0
NH3‐N (mg/L)4.035.3 50.8
West Stanly WWTP, Sanitary Sewer Improvements
20170316.00.CL
8/5/2019
1
West Stanly WWTP
II. Design Flow Rates
A. Influent Flow
Maximum Daily Flow (past 24 month) 2.411 MGD
Current Permitted Capacity 0.900 MGD
Assumed Diurnal Curve Peaking Factor 1.350
Peak Hourly Flow 3.255 MGD
Peaking Factor 3.617 Peaking Factor
Current Peak Flow 3.255 MGD
Design Influent Flow
1.2 MGD   x 3.600 PF    = 4.32 MGD
B. RAS Flow Rates
Daily Flow Conditions Maximum Flow Conditions
RAS Rate 0.50 RAS Rate 1.50
Influent Flow Rate 1.20 MGD Influent Flow Rate 4.32 MGD
RAS Flow Rate 0.60 MGD RAS Flow Rate 1.80 MGD
Total Flow 1.80 MGD Total Flow 6.12 MGD
Peak Daily Flow 6.12 MGD
Peak Hourly Flow 4,250 gpm
Because there is no storage capacity prior to the aeration basin, everything before the 
aeration basin must be designed to accommodate max influent flow conditions and max RAS 
flow.  Including headworks, piping between headworks and influent combination box, and 
aeration basin splitter box.
General range of RAS flow is 50% to 150% of minimum and maximum influent flow rate, 
respectively.
The peak hourly flow rate is based on the proposed permitted capacity of 1.2 MGD with a 
daily peaking factor of 3.6, plus the maximum return flow rate.  
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
2
West Stanly WWTP
III. Proposed Headworks
A. Proposed Influent Force Main
Design Flow 1.20 MGD
Peaking Factor 3.60 PF
Peak Design Flow 4.32 MGD
B. Magnetic Flow Meter
Type Influent Flow
Diameter 18 inch
Maximum Flow 3500 gpm
Minimum Flow 0 gpm
C. Refridgerated Auto Sampler
A refridgerated auto sampler will be stationed on top of the Influent Combination Box.
D. Combination Rotary Drum Screen and Grit Removal
Design Flow 9.00 MGD
Rotary Drum Screen Opening ‐ Perforated Plate 6 mm
Inlet ANSI Flagnes 20 inches
Outlet ANSI FLANGES 24 inches
E. Lime Slurry Slurry Feed
Feed Concentration 1000 mg/L (10%)
Feed Rate
Headworks shall include a proposed 18ʺ flow meter on the proposed influent force main, 
Two influent force mains combine at the headworks of the West Stanly WWTP one being 10ʺ 
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
3
West Stanly WWTP
F. Gravity Pipe to Aeration Basin Splitter Box
Pipe Diameter 24 inches
Full Pipe Area 3.14 ft2
Full Pipe Wetted Perimeter 6.28 ft
Hydraulic Radius 0.50 ft
Invert Elevation 372.33 ft
Effluent Elevation 372.33 ft
Length 5 ft
Slope 0 ft/ft
Manning Coefficient 0.013
Flow (Manningʹs Eq) 0 ft3/s
G. Aeration Basin Splitter Box
Influent Invert Elevation 372.33 ft
Influent Diameter 24 inches
Effluent Invert Elevation 371.50 ft
Effluent Diameter 18 inches
Number of Effluent Pipes 2 Total
H. Gravity Pipe: Aeration Basin Splitter Box to Aeration Basins
Pipe Diameter 18 inches
Full Pipe Area 1.77 ft2
Pull Pipe Wetted Perimeter 4.71 ft
Hydraulic Radius 0.38 ft
Invert Elevation 371.50 ft
Effluent Elevation 365.00 ft
Length 148 ft
Slope 0.04 ft/ft
Manning Coefficient 0.013
Flow (Manningʹs Eq) 22.07 ft3/s 14.27 MGD
Design Flow 3.06 MGD OK
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
4
West Stanly WWTP
IV. Aeration Basin
A. Operating Conditions
Basin Volume 1,064,000 gallon
MLSS 3,750 mg/L
RAS/WAS Concentration 8,000 mg/L
α, Alpha Transfer Rate 0.75
β, Beta Transfer Rate 0.95
MCRT 25 days
Cww, Design DO 6.00 mg/L
Cs, DOsat of Tap Water at Field Conditions 7.99 mg/L
CS20,  DOsat of Tap Water at 20°C 9.03 mg/L
Tmax 27 °C
lb BOD5/ 1,000 cf Aeration Volume 20 lb/cf
Required O2 lb/BOD5 Removed lb 0.70 O2 lb/ BOD5 lb Removed
Required O2 lb/TN Removed lb 4.60 O2 lb/ TN lb Removed
Sludge Yield 0.65
lb TSS/ lb BOD5 Destroyed
VSS Fraction 0.65 MLVSS/MLSS
lb O2/BHP‐HR 7.5
BHP/1,000 CF 1.5
B. Aeration Requirements for BOD 5 and Nitrogen Removal
Average Influent BOD 5 168 mg/L
Effluent Weekly Average BOD 5 Limit 15.0 mg/L
BOD5 Removed 153.0 mg/L
Average Influent TSS 181.0 mg/L
Effluent Weekly Average TSS Limit 45.0 mg/L
TN (approximated from TSS values, 0.12 g N/g TSS)16.3 mg/L
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
5
West Stanly WWTP
Actual Oxygen Transfer Rate 1,823 lb/day 6,563 lb/day
Standard Oxygen Transfer Rate 11,690 lb/day 42,085 lb/day
Required Oxygen per Day 1,823 lb/day 6,563 lb/day
Required Oxygen per Day per Basin 912 lb/day/basin 3,282 lb/day/basin
Required Oxygen per Hour per Unit 9 lb/hr/unit 34 lb/hr/unit
Required Aeration Volume 572,716 gallons 2,061,778 gallons
C. Proposed Aeration Basin Equipment
Independent Aerating and Mixing Equipment
1. Aeration ‐ Submerged Fine Bubble Diffuser
Oxygen Supplied per Unit 32
O2 lb/hr
Number of Units 4 per basin
Oxygen Supplied per Basin 3,072
O2 lb/day/basin
2. Mixing ‐ Submerged Rotating Propeller
Mixing HP 10 hp
Number of Units 4 per Basin
Mixing HP per Basin 40 hp/basin
Mixing Requirements Design Flow Peak Flow
Required BHP per Hour per Basin 5 HP 18 HP
Required BHP per Hour per Unit 1.27 HP 5 HP
Design Flow Peak Flow*
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
6
West Stanly WWTP
V. Clarifier Splitter Box
A. Gravity Pipe to Clarifier Splitter Box
Pipe Diameter 18 inches
Full Pipe Area 1.77 ft2
Pull Pipe Wetted Perimeter 4.71 ft
Hydraulic Radius 0.38 ft
Invert Elevation 364.25 ft
Effluent Elevation 360.82 ft
Length 150 ft
Slope 0.02 ft/ft
Manning Coefficient 0.012
Flow (Manningʹs Eq) 17.26 ft3/s 11.16 MGD
Design Flow 3.06 MGD OK
B. Clarifier Splitter Box
Influent Flow 4.32 MGD
RAS Flow 1.80 MGD
Total Flow Through Clarifiers 6.12 MGD
Assumed Weir Overflow Rate (per Metcalf & Eddy)25,000 gal/ft day
Clarifier No. 1 ‐ 50 ft Clarifier
    Effluent Weir Diameter 40.00 ft
    Weir Length 125.66 ft
    Flow Rate 3,141,593 gal/day
Clarifier No. 2 ‐ 75 ft Clarifier
    Effluent Weir Diameter 75.00 ft
    Weir Length 235.62 ft
    Flow Rate 5,890,486 gal/day
Porportion of Flow in Clarifier No. 1 34.78 %
Porportion of Flow in Clarifier No. 2 65.22 %
Assuming peak flow conditions with both clarifiers in service, using weir overflow length, 
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
7
West Stanly WWTP
C. Gravity Pipe to Proposed 75ʹ Diameter Clarifier
Pipe Diameter 16 inches
Full Pipe Area 1.40 ft2
Pull Pipe Wetted Perimeter 4.19 ft
Hydraulic Radius 0.33 ft
Invert Elevation 364.46 ft
Effluent Elevation 364.11 ft
Length 65 ft
Slope 0.005 ft/ft
Manning Coefficient 0.012
Flow (Manningʹs Eq) 6.116 ft3/s 3.95 MGD
Design Flow 3.99 MGD Problem
D. Gravity Pipe to 50ʹ Diameter Clarifier
Pipe Diameter 12.00 inches
Full Pipe Area 0.79 ft2
Pull Pipe Wetted Perimeter 3.14 ft
Hydraulic Radius 0.25 ft
Invert Elevation 364.46 ft
Effluent Elevation 364.11 ft
Length 83.50 ft
Slope 0.004 ft/ft
Manning Coefficient 0.012
Flow (Manningʹs Eq) 2.506 ft3/s 1.62 MGD
Design Flow 2.13 MGD Problem
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
8
West Stanly WWTP
VI. Secondary Clarifiers
LEGEND
0.00  = data that is input into spreadsheet 0.00  = values calculated by spreadsheet
NARRATIVE
GIVEN & ASSUMPTIONS
Design Flow Peak
Total Flow (Influent + RAS)1.80 MGD 6.12 MGD
Design MLSS Concentration 3,750 mg/l
# of Units 2
1 @ 75 ft. diameter
1 @ 50 ft. diameter
Sidewater Depth 14 ft.
Design Surface Loading Rate 400 gpd/sf 1000 gpd/sf
Design Solids Loading Rate 30 lb/day/sf 38 lb/day/sf
Design Weir Overflow Rate 10,000 gpd/lf 30,000 gpd/lf
Design Detention Time 4 hrs.4 hrs.
SELECTED DIMENSIONS
A. Proposed 75ʹ Secondary Clarifier
Diameter 75 ft
Sidewater Depth 14 ft
Clarifier Surface Area 4,418 ft2
Weir Length 236 ft
B. Existing 50ʹ Secondary Clarifier
Diameter 50 ft
Sidewater Depth 14 ft
Clarifier Surface Area 1,963 ft2
Weir Length 157 ft
Plant layout shall include the addition of a new onsite headworks, replacement of 
aeration and mixing equipment, and replacement of two 25 ft secondary clarifiers with 
one 75 ft secondary clarifier.
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
9
West Stanly WWTP
1. Area Required
a. Surface Loading Basis:Area = Design Flow / Surface Loading Rate
=4,500 ft2
b. Solids Loading Basis:Area = (Design Flow x MLSS x( 8.34 lb./gal.)) / (30 lb./day/sf)
=1,877 ft2
c.Weir Overflow Basis Weir Length = Design Flow / Weir Overflow Rate
=180 ft.
(Calculated Parameters, cont.)
d. Detention Time Basis Area =
=1,432 ft2
AVAILABLE CLARIFIER AREA ‐6,381 ft2
AVAILABLE WEIR LENGTH ‐392.7 ft.
2. Surface Loading Rates Surface Loading Rate = Flow / Area
@ Peak Flow =959 gpd/sf
@ Design Flow =282 gpd/sf
3. Solids Loading Rates Solids Loading Rate = (Flow x MLSS x (8.34 lb./gal.)) / Area
@ Peak Flow =29.99 lb/day/sf *
@ Design Flow + RAS =8.82 lb/day/sf
4. Weir Overflow Rate = Flow / Weir Length
(7.48 gal./cf) x SWD x 2 units
Design Flow x Detention Time 
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
10
West Stanly WWTP
@ Peak Flow =15,584 gpd/lf
@ Design Flow =4,584 gpd/lf
5. Detention Time =
@ Peak Flow =2.62 hrs.
@ Design Flow =8.91 hrs.
6. Buoyancy Calculations
7. Combined Gravity Pipe from Secondary Clarifiers to Chlorine Contact Chamber
Pipe Diameter 18 inches
Full Pipe Area 1.77 ft2
Pull Pipe Wetted Perimeter 4.71 ft
Hydraulic Radius 0.38 ft
Invert Elevation 350.44 ft
Effluent Elevation 350.44 ft
Length 21 ft
Slope 0.000 ft/ft
Manning Coefficient 0.012
Flow (Manningʹs Eq) 0.000 ft3/s 0.00 MGD
Area x SWD x (7.48 gal./cf) x (24 hrs./day)
Flow (gpd)
* Solids loading rate during peak conditions is typically more dilute as inflow and 
infiltration dilute the concentration of the wastewater, thereby also diluting the 
concentration of the solids loading rate.
The calculations were not completed for the clarifier because there was no water table 
documented on any of the five borings completed on site, three of which were on the 
proposed clarifier perimeter.  See Geotechnical report prepared by ECS Sotuheast in 
Appendix A.
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
11
West Stanly WWTP
VII. Proposed Chlorine Contact Chamber
A. Chlorine Contact Basin
Influent Invert Elevation 350.44 ft
Bottom of Channel Elevation 344.88 ft
Top of Wall 354.98 ft
Existing Top of Wall 352.38 ft
Change in Top of Wall Elevation 2.60 ft
Effluent Weir Elevation 352.50 ft
Effluent Invert Elevation 345.44 ft
Water Level at Permitted Flow 352.71 ft
Water Level at Peak Flow 352.98 ft
B. Chlorine Contact Time
Dual Train
Flow Length 125 ft/train
Channel Width 3 ft
Bottom of Channel 344.88 ft
Weir Elevation 352.50 ft
Water Level at Permitted Flow 352.71 ft
Water Level at Peak Flow 352.98 ft
Permitted Flow Per Train 0.60 MGD
Detention Time 52.72 minutes
Peak Flow Per Train 2.16 MGD
Detention Time 15.15 minutes
C. Dechlorination
Dual Train
Flow Length 32 ft/train
Pipe Diameter 18 inch
Permitted Flow Per Train 0.60 MGD
Detention Time 19.54 minutes
Peak Flow Per Train 2.16 MGD
Detention Time 5.43 minutes
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
12
West Stanly WWTP
VIII. Effluent Pump Station
A. Calculating Design Effluent Flow
Permitted Capacity 1.200 MGD 833 gpm
Peak Flow 4.320 MGD 3,000 gpm
B. Calculating the Proposed System Curve
1. PS Total Suction Head
Pressure (psi) 0
Initial Elevation 317.50
C, value 150
Equivalent Length  (ft) 15
    Length (ft) 15
    Diameter (in) 8
    Material DIP
Per Total
    90° Bend 0
60
    45° Bend 0
60
    Tee‐Straight 0
40
    Tee‐Branch 0
20 0
    Swing Valve (full open) 0
70
    Globe Valve (full valve) 0
210 0 0
2. PS Total Discharge Head
Pressure (psi) 0
Final Elevation (ft) 418
C, value 150
Equivalent Length  (ft) 12,896
    Length 12,700
    Diameter (in) 12
    Material DIP
Per Total
    90° Bend 2
816
    45° Bend 9
10 87
    Tee‐Straight 2
510
    Tee‐Branch 2
30 60
    Swing Valve (full open) 1.5
12 18
    Globe Valve (full valve) 0
330 0
    Gate Valve (full open) 1.5
3 4 196
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
13
West Stanly WWTP
C. PS Total Dynamic Head (ft)
Flow (gpm)Velocity (ft/s)Hv (S) (ft)Hf (S) (ft)
Total 
Suction (ft)Hv (D) (ft)Hf (D) (ft)
Total 
Discharge 
(ft)TDH (ft)
600 3.83 0.23 0.08 317.81 0.23 9.71 427.94 110.75
900 5.75 0.51 0.17 318.19 0.51 20.56 439.08 122.26
1,200 7.67 0.91 0.29 318.71 0.91 35.01 453.93 137.63
1,500 9.59 1.43 0.44 319.37 1.43 52.91 472.34 156.71
1,800 11.50 2.05 0.62 320.18 2.05 74.13 494.19 179.36
2,100 13.42 2.80 0.83 321.12 2.80 98.60 519.39 205.52
2,400 15.34 3.65 1.06 322.21 3.65 126.23 547.88 235.09
2,700 17.25 4.62 1.32 323.44 4.62 156.96 579.58 268.02
3,000 19.17 5.71 1.60 324.81 5.71 190.74 614.45 304.25
3,450 22.05 7.55 2.07 327.12 7.55 247.02 672.57 364.68
3,900 24.92 9.65 2.60 329.74 9.65 309.91 737.55 432.30
D. Calculating NPSHA
ElevationPS (ft)331.69
hatm (ft)33.6
he (ft)14.19
hf (ft)1.60
Temperature WW (°F)60
hvp (ft)0.60
FS (ft)2
15.21
2 Pumps in Parallel
D. Pump Selection 1 TDH (ft) Q (gpm) 3600 240
Goulds 14RJLC 480 0 3000 295
Qpump (gpm)1500 425 600 2400 335
TDH (ft)295 395 1200 1800 365
Speed (rpm)1770 365 1800 1200 395
Diameter (in)10 335 2400 600 425
NPSHR (ft)16 295 3000 0 480
Efficiency 79.27% 240 3600
Power (hp)158.8
Pump Curve
NPSHA (ft)
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
14
West Stanly WWTP
Pump Impeller
E. Pump Evaluation
NPSHRmax 16.00 ft
NPSHA 15.21 ft
Design Flow Rate 3,000 gpm
Flow Rate of One Pump at Design Head 1,500 gpm
Flow Rate of Two Pumps at Design Head 3,000 gpm
0
100
200
300
400
500
600
0 500 1000 1500 2000 2500 3000 3500 4000 4500TDH (ft)Flow (gpm)
Effluent Pump Station
Proposed System Curve vs Pump Curves
Pump Curve at Min. Conditions System Curve Pump Curve at Max. Conditions
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
15
West Stanly WWTP
IX. Proposed Chlorine and Sulfur Dioxide Feed
1. Chlorine Gas Feed
Chlorine Contact Time @ Peak Flow 15.15 minutes
Chlorone Contact Time @ Average Daily flow 52.72 minutes
Maximum Dosage 8 mg/L
CL2 Feed Rate at Peak Flow 288 lbs/day
CL2 Feed Rate at Permitted Flow 80 lbs/day
Amount of SO2 Required 1 lb/lb of CL2
SO2 Feed Rate at Peak Flow 288 lbs/day
SO2 Feed Rate at Permitted Flow 80 lbs/day
Chemical Storage= 3x Peak Daily Feed Rate = 865 lbs
Additional 150 lb Cylinders Required for Storage = 6 Cylinders
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
16
West Stanly WWTP
X. RAS/WAS Pump Station
A. Calculating Design Return Flow 
Return at 50% Permitted Capacity 0.600 MGD 417 gpm
Return at 150% Peak Flow 1.800 MGD 1,250 gpm
Return through RAS Pump #3 815 gpm
Return through RAS Pump #2 435 gpm
B. PS Total Suction Head
Pressure (psi) 0
363.55
140
Equivalent Length  (ft) 168
80
    Diameter (in) 8
    Material DIP
Per Total
    90° Bend 5
629
    45° Bend 0.5
63
    Tee‐Straight 0
40
    Tee‐Branch 1
20 20
    Swing Valve (full open) 0
70
    Plug Valve 3
12 36 88
361.25
Initial Elv. / Clarifier Weir Elv. 
(ft)
C, value
    Length
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
17
West Stanly WWTP
C. PS Total Discharge Head Force Main #1
Pressure (psi) 0
Final Elevation (ft) 374
C, value 140
Equivalent Length  (ft) 1,089
    Length 922
    Diameter (in) 8
    Material DIP
Per Total
    90° Bend 10
657
    45° Bend 10
663
    Tee‐Straight 2
48
    Tee‐Branch 0
20 0
    Swing Valve (full open) 2
715
    Globe Valve (full valve) 0
210 0
    Plug Valve 2
12 24 167
D. PS Total Dynamic Head (ft) Force Main #1
S Flow (gpm)D Flow (gpm)
Velocity (D) 
(ft/s)Hf (ft)Suction (ft)
Velocity (D) 
(ft/s)Hf (ft)
Discharge 
(ft)TDH (ft)
163 163 1.04 0.09 363.64 1.04 0.60 374.44 13.07
245 245 1.56 0.20 363.75 1.56 1.28 375.12 14.89
326 326 2.08 0.33 363.88 2.08 2.17 376.01 16.96
408 408 2.60 0.51 364.06 2.60 3.28 377.12 19.29
489 489 3.13 0.71 364.26 3.13 4.60 378.44 21.85
571 571 3.65 0.94 364.49 3.65 6.12 379.96 24.64
652 652 4.17 1.21 364.76 4.17 7.83 381.67 27.66
734 734 4.69 1.50 365.05 4.69 9.74 383.58 30.90
815 815 5.21 1.82 365.37 5.21 11.83 385.67 34.36
938 938 5.99 2.36 365.91 5.99 15.32 389.16 39.96
1,060 1,060 6.77 2.96 366.51 6.77 19.23 393.07 46.02
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
18
West Stanly WWTP
E. Calculating NPSHA
ElevationPS (ft)360.75 522
hatm (ft)33.5
he (ft)10.29
hf (ft)1.82
Temperature WW (°F)60
hvp (ft)0.60
FS (ft)2
NPSHA (ft)39.37
F. Pump Selection Force Main #1 @ 743 rpm @ 903 rpm
Gorman Rupp T4B‐B‐6 Interpolated Pump Curve Two in Parallel
Qpump (gpm)325 TDH (ft)Flow (gpm)TDH (ft)Flow (gpm)
TDH (ft)15 18 0 26.5 0
Speed (rpm)743 18 100 26.5 100
Diameter (in)9.75 17.8 150 26.5 150
NPSHR (ft)4.53 17.5 200 26.4 200
Efficiency 60 17 250 26.2 250
Power (hp)1.99 15.3 300 26 300
Pump Curve T4B‐B‐6 13.75 350 25.75 350
Pump Impeller 38618‐002 25.3 400
25.1 450
24.7 500
24 550
23.5 600
23 650
22 700
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
19
West Stanly WWTP
G. Pump Evaluation Force Main #1
NPSHRmax 4.53 ft
NPSHA 39.37 ft
Design Flow Rate 815 gpm
0
5
10
15
20
25
30
35
40
45
50
0 200 400 600 800 1000 1200TDH (ft)Flow (gpm)
RAS Pump Station
Proposed System Curve vs Pump Curves
Pump Curve at Min. Conditions Proposed System Curve
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
20
West Stanly WWTP
H. PS Total Discharge Head Force Main #2
Pressure (psi) 0
Final Elevation (ft) 374
C, value 140
Equivalent Length  (ft) 1,049
    Length 922
    Diameter (in) 6
    Material DIP Per Total
    90° Bend 10
547
    45° Bend 10
545
    Tee‐Straight 2
36
    Tee‐Branch 0
15 0
    Swing Valve (full open) 2
510
    Globe Valve (full valve) 0
150 0
    Plug Valve 2
9 18 127
I. PS Total Dynamic Head (ft) Force Main #2
S Flow (gpm)D Flow (gpm)
Velocity (D) 
(ft/s)Hf (ft)Suction (ft)
Velocity (D) 
(ft/s)Hf (ft)
Discharge 
(ft)TDH (ft)
87 87 0.56 0.03 363.58 0.99 0.74 374.58 12.60
130 130 0.83 0.06 363.61 1.48 1.56 375.40 14.23
174 174 1.11 0.10 363.65 1.98 2.65 376.49 16.14
217 217 1.39 0.16 363.71 2.47 4.01 377.85 18.32
261 261 1.67 0.22 363.77 2.96 5.62 379.46 20.76
304 304 1.94 0.29 363.84 3.46 7.47 381.31 23.46
348 348 2.22 0.38 363.93 3.95 9.57 383.41 26.41
391 391 2.50 0.47 364.02 4.45 11.90 385.74 29.60
435 435 2.78 0.57 364.12 4.94 14.46 388.30 33.04
500 500 3.20 0.74 364.29 5.68 18.72 392.56 38.63
565 565 3.61 0.93 364.48 6.42 23.49 397.33 44.74
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
21
West Stanly WWTP
F. Pump Selection Force Main #2 @ 743 rpm @ 903 rpm
Gorman Rupp T4B‐B‐6 Interpolated Pump Curve Two in Parallel
Qpump (gpm)325 TDH (ft)Flow (gpm)TDH (ft)Flow (gpm)
TDH (ft)15 18 0 26.5 0
Speed (rpm)743 18 100 26.5 100
Diameter (in)9.75 17.8 150 26.5 150
NPSHR (ft)4.53 17.5 200 26.4 200
Efficiency 60 17 250 26.2 250
Power (hp)1.99 15.3 300 26 300
Pump Curve T4B‐B‐6 13.75 350 25.75 350
Pump Impeller 38618‐002 25.3 400
25.1 450
24.7 500
24 550
23.5 600
23 650
22 700
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
22
West Stanly WWTP
G. Pump Evaluation Force Main #2
NPSHRmax 4.53 ft
NPSHA 39.37 ft
Design Flow Rate 435 gpm
0
5
10
15
20
25
30
35
40
45
50
0 100 200 300 400 500 600 700 800TDH (ft)Flow (gpm)
RAS Pump Station
Proposed System Curve vs Pump Curves
Pump Curve at Min. Conditions Proposed System Curve
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
23
West Stanly WWTP
XI. Plant Drain PS
A. Existing Pump Conditions
Crown PO4LB
Suction Size 4ʺ
Discharge Size 4ʺ
500
34
1650
8.25
10.5
60
7.5
PO4LB‐8D
FP‐4285‐A
B. PS Total Suction Head
Pressure (psi) 0
335.90
125
Equivalent Length  (ft) 24
15
    Diameter (in) 6
    Material DIP
Per Total
    90° Bend 2
59
    45° Bend 0
50
    Tee‐Straight 0
30
    Tee‐Branch 0
15 0
    Swing Valve (full open) 0
50
    Plug Valve 0
909
Efficiency
Power (hp)
Pump Curve
Pump Impeller
Qpump (gpm)
TDH (ft)
Speed (rpm)
Diameter (in)
NPSHR (ft)
Min. Wet Well Elev. (ft)
C, value
    Length
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
24
West Stanly WWTP
C. PS Total Discharge Head
Pressure (psi) 0
Final Elevation (ft) 374
125
Equivalent Length  (ft) 711
605
8
    Material DIP
Per Total
    90° Bend 7
640
    45° Bend 5
632
    Tee‐Straight 40
    Tee‐Branch 1
20 20
    Swing Valve (full open) 2
715
    Globe Valve (full valve) 0
210 0
    Plug Valve 0
12 0 106
D. PS Total Dynamic Head (ft)
D Flow (gpm)
Velocity (D) 
(ft/s)Hf (ft)
Velocity (D) 
(ft/s)Hf (ft)TDH (ft)
100 1.14 0.03 0.64 0.20 40.27
150 1.70 0.06 0.96 0.42 41.41
200 2.27 0.10 1.28 0.71 42.63
250 2.84 0.15 1.60 1.07 43.93
300 3.41 0.21 1.92 1.50 45.30
350 3.98 0.28 2.24 1.99 46.76
400 4.54 0.36 2.56 2.55 48.28
450 5.11 0.44 2.88 3.18 49.88
500 5.68 0.54 3.20 3.86 51.54
575 6.53 0.70 3.67 5.00 54.17
650 7.38 0.87 4.15 6.27 56.95
700 7.95 1.00 4.47 7.19 58.89
C, value
    Length
    Diameter (in)
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
25
West Stanly WWTP
E. Calculating NPSHA
347 522
33.5
11.10
0.54
60
0.60
FS (ft)2
19.26
F. Pump Selection @ 1150 rpm
Gorman Rupp T6A‐B‐4 Interpolated Pump Curve
500 TDH (ft)Flow (gpm)
56 68 0
1150 64.5 100
12.38 62 200
8 60 300
55 57 400
15 54.5 500
T6A‐B‐4 52 600
38615‐087 49 700
ElevationPS (ft)
hatm (ft)
Power (hp)
he (ft)
hf (ft)
Temperature WW (°F)
hvp (ft)
NPSHA (ft)
Qpump (gpm)
TDH (ft)
Speed (rpm)
Diameter (in)
NPSHR (ft)
Efficiency
Pump Curve
Pump Impeller
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
26
West Stanly WWTP
G. Pump Evaluation
8.00 ft
19.26 ft
0 gpm
Flow Rate of One Pump at Design Head 285 gpm
Flow Rate of Two Pumps at Design Head 600 gpm
NPSHRmax 
NPSHA 
Design Flow Rate
0
10
20
30
40
50
60
70
80
0 100 200 300 400 500 600 700 800TDH (ft)Flow (gpm)
RAS Pump Station
Proposed System Curve vs Pump Curves
Pump Curve at Min. Conditions Proposed System Curve
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
27
West Stanly WWTP
XII. Plant Water Supply
A. Plant Nonpotable Water Demand
Maximum Flow
Yard Hydrants = 8 Ea. @ 5 gpm Total= 40
Headworks Unit = 1 Ea. @ 46 gpm Total= 46
2 Ea. @ 5 gpm Total= 10
Total Flow Demand= 96
B. PS Total Suction Head
Pressure (psi) 0
316.50
140
Equivalent Length  (ft) 23
15
    Diameter (in) 2
    Material PVC
Per Total
    90° Bend 1
88
    45° Bend 0
30
    Tee‐Straight 0
40
    Tee‐Branch 0
12 0
    Swing Valve (full open) 0
12 0
    Plug Valve 0
808
Disinfection/ 
Dechlorination Feed =
C, value
    Length
Initial Elv. (ft)
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
28
West Stanly WWTP
C. PS Total Discharge Head
Pressure (psi) 100
Final Elevation (ft) 383
140
Equivalent Length  (ft) 944
900
2
    Material PVC
Per Total
    90° Bend 2
815
    45° Bend 4.5
312
    Tee‐Straight 4
417
    Tee‐Branch 0
12 0
    Swing Valve (full open) 0
12 0
    Globe Valve (full valve) 0
70 0 44
D. PS Total Dynamic Head (ft)
Flow (gpm)Velocity (S) (ft/s)Hv (S) (ft)Hf (ft)
Velocity (D) 
(ft/s)Hv (D) (ft)Hf (ft)TDH (ft)
19 2.0 0.06 0.20 2.0 0.06 8.5 306
29 2.9 0.13 0.43 2.9 0.13 18.1 316
38 3.9 0.24 0.73 3.9 0.24 30.8 329
48 4.9 0.37 1.11 4.9 0.37 46.5 345
58 5.9 0.54 1.55 5.9 0.54 65.2 365
67 6.9 0.73 2.07 6.9 0.73 86.7 387
77 7.9 0.96 2.65 7.9 0.96 111.0 413
86 8.8 1.21 3.29 8.8 1.21 138.0 441
96 9.8 1.50 4.00 9.8 1.50 167.7 472
110 11.3 1.98 5.18 11.3 1.98 217.2 523
125 12.8 2.53 6.49 12.8 2.53 272.4 581
    Diameter (in)
C, value
    Length
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
29
West Stanly WWTP
E. Calculating NPSHA
332.67
33.6
16.17
4.00
60
0.60
FS (ft)2
10.83
F. Pump Selection
Goulds TDH (Ft) Flow (GPM)
86 600 0
440 580 20
3550 555 40
4 525 60
8.7 460 80
61.08% 400 100
20 340 120
ElevationPS (ft)
hatm (ft)
Pump Curve
Pump Impeller
Power (hp)
he (ft)
hf (ft)
TDH (ft)
Speed (rpm)
Diameter (in)
NPSHR (ft)
Efficiency
Temperature WW (°F)
hvp (ft)
NPSHA (ft)
Qpump (gpm)
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
30
West Stanly WWTP
G. Pump Evaluation
8.70 ft
10.83 ft
96 gpm
NPSHRmax 
NPSHA 
Design Flow Rate
0
100
200
300
400
500
600
700
0 20406080100120140TDH (ft)Flow (gpm)
Plant Water  Pump 
Proposed System Curve vs Pump Curve
Pump Curve at Min. Conditions Proposed System Curve
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
31
West Stanly WWTP
XIII. Aerobic Sludge Digester
A. Existing Dimensions
Digester Length 75 ft
Digester Width 52 ft
Sidewater Depth 17 ft
Storage Volume 495,957 gallons
B. Required Dimensions
Aeration Basin Volume 1.06 MG
Total Clarifier Volume 0.67 MG
MLSS Concentration 3,750 mg/L
WAS Concentration 8,000 mg/L
Monthly Average Effluent TSS 30 mg/L
Design Effleunt Flow 1.2 MGD
Design MCRT 20 days
Design WAS Flow 18,938 GPD
Required Detention Time 25 Days
Required Storage Volume              473,438 Gallons
C. Conclusion
495,957 gallons is larger than 473,438 gallons, therefor the existing digester has 
adequate storage for the desired wasting volume and retetion time.
West Stanly WWTP and Sanitary Sewer Improvements SRF
20170316.00.CL
8/5/2019
32
W.K. DICKSON & CO., INC
Community Infrastructure Consultants
616 Colonnade Drive
Charlotte, NC 28205
Phone (704) 334‐5348  Fax (704) 334‐0078
Project:West Stanly WWTP Improvements WKD No: 20170316.00.CL
Owner:Stanly County, NC Date: 09/05/19
Project Description:
ITEM DESCRIPTION UNIT EST QTY UNIT COST TOTAL
1 Mobilization (3% of Construction Cost) LS 1 $91,300 $91,300
2 Earthwork LS 1 $50,000 $50,000
3Erosion and Sedimentation Control LS 1 $15,000 $15,000
4 Demolition LS 1 $50,000 $50,000
Headworks
5Asphalt Patch SF 4,860 $6 $29,160
6Concrete Slab ‐ Concrete and Reinforcement CY 5 $350 $1,750
7Aluminum Grating SF 475 $80 $38,000
8Aluminum Railing LF 148 $120 $17,700
9Aluminum Stairs LS 1 $7,500 $7,500
10 Refrigerated Auto Sampler EA 1 $7,500 $7,500
11 18ʺ Influent Magnetic Flow Meter and Vault EA 1 $22,500 $22,500
12 Rotary Drum Screen and Grit Removal EA 1 $676,400 $676,400
13 Aeration Basin Splitter Box EA 1 $52,500 $52,500
Aerating and Mixing Equipment
14 Aerating and Mixing Equipment with controls EA 8 $75,000 $600,000
15 Clarifilier Splitter Box Modifications LS 1 $25,000 $25,000
Clarifier Splitter Box
16ʺx21ʺ Weir Gate EA 1 $3,000 $3,000
 12ʺx21ʺ Weir Gate EA 1 $3,000 $3,000
Proposed 75ʺ Diameter Clarifier
16 Hydraulic Drive Rotating Mechanism EA 1 $225,000 $225,000
17 Concrete Slab ‐ Concrete and Reinforcement CY 220 $350 $77,000
18 Concrete Walls ‐ Concrete and Reinforcement CY 180 $700 $126,000
Existing 50ʹ Diameter Clarifier
Opinion of Probable Project Costs
This project will move to expand plant process to handle higher surge flows, as well as improve the processes for ease of operation. New 
aeration units will be placed in the aeration basins to replace the current mechanical mixers. The proposed floating aeration units will include 
separate submersible mixing and blower assemblies to provide greater operator control of the aeration process. The headworks assembly will 
be relocated from the McCoy Creek Pump Station to the Plant site, this will allow the operators to have more daily oversight of the primary 
treatment. Two currently abandoned 25‐foot secondary clarifiers will be demolished and replaced with a single 75‐foot clarifier, which will run 
simultaneously with the current 50’ clarifier. This will provide redundancy as will as increased capacity. The chlorine contact chamber will be 
expanded for capacity and split into two separate trains to allow easier access for cleaning. The disinfection and dichlorination system will be 
replaced and relocated to separate building from the lab office, closer to the chlorine contact chamber. The effluent will be upgraded to increase 
capacity. With the increase in sludge, the RAS pump station will be replaced, and new force main will be installed to be able to pull from each 
clarifier independently. Finally, the increase in water demand from the headworks unit and additional yard hydrants will be met installing a 
new non‐potable plant water system, originating from the effluent wet well.
19 Clarifier Rehabilitation EA 1 $165,000 $165,000
RAS Pump Station
20 RAS Pumps with NEMA 4X Control Panel (VFDʹs) LS 1 $150,000 $150,000
21 Concrete Slab ‐ Concrete and Reinforcement CY 8 $350 $2,625
22 4ʺ WAS Magnetic Flow Meter and Vault EA 1 $10,000 $10,000
Chlorine Contact Chamber
22 Modications for Dual Chambers for Chlorine Contact LS 1 $35,000 $35,000
23 Aluminum Grating SF 315 $80 $25,200
24 Aluminum Railing LF 225 $120 $27,000
Effluent Pump Station
25 Effluent Vertical Turbine Pumps LS 1 $250,000 $250,000
26 NPW Vertical Turbine Pumps LS 1 $35,000 $35,000
27 Concrete Pedestal ‐ Concrete & Reinforcement CY 0.15 $350 $53
28 pH Probe W/ 4ʺ Penetration LS 1 $2,000 $2,000
Disinfection Building
29 Chlorination/Dechlorination Equipment LS 1 $75,000 $75,000
30 Metal Roof Overhang LS 1 $2,250 $2,250
31 Concrete Pad for Caustic Feed CY 3 $350 $1,050
32 Metering Pump for Caustic Feed (Pump, piping, spill pads) LS 1 $4,500 $4,500
33 7ʹ Single Aluminum Swing Door EA 2 $500 $1,000
34 Wood Framed Partition Wall SF 255 $20 $5,100
35 Water Line, 2ʺ SCH 80 PVC LF 45 $20 $900
Piping, Valves, and Fittings
36 4ʹ Dia. Concrete Manhole, Completed EA 2 $7,500 $15,000
37 Yard Piping ‐ Influent Header, 16ʺ DIP LF 339 $103 $34,917
38 Yard Piping ‐ Influent to Influent Combination Box, 18ʺ DIP LF 355 $140 $49,700
39 Yard Piping ‐ Aeration Splitter to Aeration Basin, 18ʺ DIP LF 335 $140 $46,900
40 Yard Piping ‐ Aeration to Clarifier Splitter Box, 18ʺ DIP LF 265 $140 $37,100
41 Yard Piping ‐ Clarifier Splitter to Clarifier #2, 16ʺ DIP LF 65 $140 $9,100
42 Yard Piping ‐ Clarifier #2 Effluent Line, 16ʺ DIP LF 50 $125 $6,250
43 Yard Piping ‐ SSMH to Chlorine Contact Chamber, 16ʺ DIP LF 15 $125 $1,875
44 Yard Piping ‐ CCC to Effluent PS, 18ʺ DIP LF 22 $140 $3,080
45 Yard Piping ‐ RAS Suction Line, 8ʺ DIP LF 85 $80 $6,800
46 Yard Piping ‐ RAS Line, 6ʺ DIP LF 695 $70 $48,650
47 Yard Piping ‐ RAS Line, 8ʺ DIP LF 705 $80 $56,400
48 Yard Piping ‐ Drain Line, 8ʺ DIP LF 625 $80 $50,000
49 Yard Piping ‐ WAS Line, 4ʺ DIP LF 35 $50 $1,750
50 Yard Piping ‐ Drain Line, 4ʺ SCH 40 PVC LF 600 $30 $18,000
51 Yard Piping ‐ Water Line, 2ʺ SCH 80 PVC LF 290 $40 $11,600
52 Non‐Freeze Yard Hydrant EA 4 $65 $260
Micellaneous
53 Electrical LS 1 $250,000 $250,000
Opinion of Probable Project Cost $3,557,370
costs will not vary from opinions of probable construction costs prepared by WK Dickson.
WK Dicksonʹs opinions of probable construction costs are made on the basis of WK Dicksonʹs 
experience and qualifications and represent WK Dicksonʹs best judgment as a professional generally familiar 
with the construction industry.  Since WK Dickson has no control over the cost of labor, materials, equipment,
or services furnished by others; over the contractorʹs methods of determining prices; or over competitive bidding
or market conditions, WK Dickson cannot and does not guarantee that proposals, bids, or actual construction

ECS Southeast, LLP
Geotechnical Engineering Report
Stanly County WWTP Rehabilitation

Oakboro, Stanly County, North Carolina

ECS Project Number 08:12742

May 3, 2018

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 1

TABLE OF CONTENTS

EXECUTIVE SUMMARY ............................................................................................................. 2
1.0 INTRODUCTION .................................................................................................................. 3
1.1 General ................................................................................................................................... 3
1.2 Scope of Services .................................................................................................................... 3
2.0 PROJECT INFORMATION ..................................................................................................... 4
2.1 Project Location...................................................................................................................... 4
2.2 Past Site History/Uses and current site conditions ................................................................ 4
3.0 FIELD EXPLORATION ........................................................................................................... 5
3.1 Field Exploration Program ...................................................................................................... 5
3.1.1 Test Borings .................................................................................................................. 5
3.2 Regional/Site Geology ............................................................................................................ 5
3.3 Subsurface Characterization .................................................................................................. 6
3.4 Groundwater Observations .................................................................................................... 6
4.0 LABORATORY SERVICES ...................................................................................................... 7
5.0 DESIGN RECOMMENDATIONS ............................................................................................. 8
5.1 Building Design ....................................................................................................................... 8
5.1.1 Foundations .................................................................................................................. 8
5.1.2 Floor Slabs ..................................................................................................................... 8
5.1.3 Seismic Design Considerations ..................................................................................... 9
5.2 Site Design Considerations ................................................................................................... 10
5.2.1 Cut and Fill Slopes ....................................................................................................... 10
6.0 SITE CONSTRUCTION RECOMMENDATIONS ....................................................................... 11
6.1 Subgrade Preparation .......................................................................................................... 11
6.1.1 Stripping and Grubbing ............................................................................................... 11
6.1.2 Proofrolling ................................................................................................................. 11
6.1.3 Subgrade Stabilization ................................................................................................ 11
6.2 Earthwork Operations .......................................................................................................... 12
6.2.1 Below Grade Excavation ............................................................................................. 12
6.2.2 Structural Fill Materials............................................................................................... 13
6.2.3 Compaction ................................................................................................................. 13
6.3 Foundation and Slab Observations ...................................................................................... 15
6.4 Utility Installations ............................................................................................................... 15
6.5 General Construction Considerations .................................................................................. 16
7.0 CLOSING ........................................................................................................................... 17

APPENDICES

Appendix A – Drawings & Reports
 Site Vicinity Map
 Boring Location Diagram

Appendix B – Field Operations
 Reference Notes for Boring Logs
 Boring Logs B-1 through B-5
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 2

EXECUTIVE SUMMARY
This report contains the results of our subsurface exploration and geotechnical engineering
evaluation for the proposed rehabilitation project. The project site is located at the existing
wastewater treatment facility located at 24939 Barbees Grove Road, Oakboro, North Carolina.

The results of our exploration and geotechnical recommendations are summarized as follows:
 The subsurface conditions disclosed by the borings generally consisted of surficial topsoil,
underlain by existing fill soils and residual soils, underlain by partially weathered rock to
the explored depths of the borings. The existing fill soils typically consisted of Sandy CALY
(CL) and Sandy SILT (ML) with SPT N-values ranging from 3 to 18 bpf. Onsite residual soils
typically consisted of Sandy CLAY (CL), Clayey SAND (SC), and Sandy SILT (ML).

 Based on the results of the subsurface exploration, the proposed structures can be
supported on conventional shallow foundations bearing on approved existing fill, low
plasticity residual soils, or new engineered fill. An allowable bearing pressure of 2,500 psf
is recommended provided the site and foundation subgrade preparation sections of this
report are followed.

 Concrete slabs-on-grade supported by approved residual soils or properly prepared
engineered fills can be designed using a modulus of subgrade reaction of 100 pounds per
cubic inch (pci).

 A Seismic Site Class “C” may be used for the site property based on the Average N
method.

Specific information regarding the subsurface exploration procedures, the site and subsurface
conditions at the time of our exploration, and our conclusions and recommendations concerning
the geotechnical design and construction aspects of the project are discussed in detail in the
subsequent sections of this report. Please note this Executive Summary is an important part of
this report but should be considered a “summary” only. The subsequent sections of this report
constitute our findings, conclusions, and recommendations in their entirety. Furthermore, ECS
should review our findings and recommendations in their entirety once the final project criteria
have been established.
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 3

1.0 INTRODUCTION
1.1 GENERAL
The purpose of this study was to provide general subsurface conditions at the site and to evaluate
those conditions with regard to foundation and floor slab support, along with general site
development. The project will include a rehabilitation of the existing wastewater treatment
facility. No other information has been provided at this time. A grading plan and finished floor
elevation has not been provided to us at this time; therefore, we have assumed cut/fill depths
across the site will on the order of 5 feet or less.

The recommendations developed for this report are based on project information supplied by WK
Dickson. This report contains the results of our subsurface exploration and laboratory testing
programs, site characterization, engineering analyses, and recommendations for the design and
construction of the proposed structures.

1.2 SCOPE OF SERVICES

To obtain the necessary geotechnical information required for design of the proposed structure,
five (5) soil test borings were performed at locations jointly selected by WK Dickson. A laboratory-
testing program was also implemented to characterize the physical and engineering properties of
the subsurface soils.

This report discusses our exploratory and testing procedures, presents our findings and
evaluations and includes the following.
 Information on site conditions including surface drainage, geologic information, and
special site features.
 Description of the field exploration and laboratory tests performed.
 Final logs of the soil borings and records of the field exploration and laboratory tests in
accordance with the standard practice of geotechnical engineers. This includes a boring
location diagram and vicinity map. Grade elevations at the top of each boring are
provided.
 Seismic site classification per the North Carolina Building Code (NCBC).
 Recommendations regarding foundation options for the structure and settlement
potential.
 Recommendations regarding slab-on-grade construction and design.
 Evaluation of the on-site soil characteristics encountered in the soil borings.
 Recommendations for minimum soil cover during frost heaving, compaction requirements
for fill and backfill areas, and slab-on-grade construction.
 Recommendations regarding site preparation and construction observations and testing.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 4

2.0 PROJECT INFORMATION
2.1 PROJECT LOCATION
The project site is located at the existing wastewater treatment facility located at 24939 Barbees
Grove Road, Oakboro, North Carolina as shown in the Site Vicinity Map (Figure 2.1.1) below, and
included in Appendix A.

Figure 2.1.1. Site Location

2.2 PAST SITE HISTORY/USES AND CURRENT SITE CONDITIONS
Based on the Google Earth historical imagery, the site was developed to its current state prior to
1993, with additions to the facilities that likely included minor grading. Based on Google Earth the
ground surface at the site generally ranges from a high elevation of approximately 367 feet in the
north western portion of the site to a low elevation of approximately 345 feet on the south
eastern portion of the site. The previous use discussion is not considered a comprehensive or in-
depth review of the site history, rather a brief overview of available aerial imagery.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 5

3.0 FIELD EXPLORATION
3.1 FIELD EXPLORATION PROGRAM
The field exploration was planned with the objective of characterizing the project site in general
geotechnical and geological terms and to evaluate subsequent field and laboratory data to assist
in the determination of geotechnical recommendations.

3.1.1 Test Borings
The subsurface conditions were explored by drilling five (5) soil test borings across the site. An
ATV-mounted SIMCO 2400 drill rig was utilized to drill the soil test borings. Borings were
generally advanced to depths ranging from approximately 13.1 to 20 feet below the current
ground surface.

Boring locations were identified in the field by ECS personnel using handheld GPS techniques and
existing landmarks as reference prior to mobilization of our drilling equipment. The approximate
as-drilled boring locations are shown on the Boring Location Diagram in Appendix A. Ground
surface elevations noted on our boring logs were approximated from Google Earth and should be
considered approximate.

Standard penetration tests (SPTs) were conducted in the borings at regular intervals in general
accordance with ASTM D 1586. Small representative samples were obtained during these tests
and were used to classify the soils encountered. The standard penetration resistances obtained
provide a general indication of soil shear strength and compressibility.

3.2 REGIONAL/SITE GEOLOGY
The site is located in the Piedmont Physiographic Province of North Carolina. The native soils in
the Piedmont Province consist mainly of residuum with underlying saprolites weathered from the
parent bedrock, which can be found in both weathered and unweathered states. Although the
surficial materials normally retain the structure of the original parent bedrock, they typically have
a much lower density and exhibit strengths and other engineering properties typical of soil. In a
mature weathering profile of the Piedmont Province, the soils are generally found to be finer
grained at the surface where more extensive weathering has occurred. The particle size of the
soils generally becomes more granular with increasing depth and gradually changes first to
weathered and finally to unweathered parent bedrock. The mineral composition of the parent
rock and the environment in which weathering occurs largely control the resulting soil's
engineering characteristics. The residual soils are the product of the weathering of the parent
bedrock.

In addition, it is apparent that the natural geology within the site has been modified in the past by
grading that included placement of fill materials. The quality of man-made fills can vary
significantly, and it is often difficult to access the engineering properties of existing tests
performed in soil test borings and the degree of compaction of existing fill soils; however, a
qualitative assessment of existing fills can sometimes be made based on the N-values obtained
and observations of the materials sampled in the test borings.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 6

3.3 SUBSURFACE CHARACTERIZATION
The following sections provide generalized characterizations of the soil and rock strata
encountered during our subsurface exploration. For subsurface information at a specific location,
refer to the Boring Logs in Appendix B.

Table 3.3.1 Subsurface Stratigraphy
Approximate
Depth Range
(ft)
Stratum Description Ranges of
SPT(1) N-values (bpf)
0 to 0.25(2)
(Surface
cover)
n/a Varying amounts of surficial organic laden soil
was present at the ground surface at each of
the boring locations.
N/A
0.25 to 8 I FILL – Sandy CLAY (CL) and Sandy SILT (ML) 3 to 18
5 ½ to 8 II RESIDUAL- Sandy CLAY (CL) and Sandy SILT
(ML)(3)
33 to 77
8 to 20 III PARTIALLY WEATHERED ROCK – Sampled as
Clayey SAND and Sandy CLAY(4)(5)
100+
Notes: (1) Standard Penetration Test
(2) Surficial organic laden soils were encountered at each boring location. Please note that the surficial materials are driller
reported. Therefore, they should not be used in surficial material removal takeoffs.
(3) Residual soils were encountered below fill soils at Borings B-2 and B-3.
(4) Partially weathered rock (PWR) was encountered below fill soils at Borings B-1, B-4, and B-5 and below residual soils at
Borings B-2 and B-3.
(5) Auger refusal was encountered below PWR at each boring location with the exception of Boring B-1.

3.4 GROUNDWATER OBSERVATIONS
Groundwater measurements were attempted at the termination of drilling and prior to
demobilization from the site. Each of the boring locations was dry at the time of drilling and to the
depths explored. Cave-in depths were attempted to be measured at each of the boring locations
with the cave-in depths ranging from approximately 9.5 to 15.7 feet. Cave-in of a soil test boring
can be caused by groundwater hydrostatic pressure, weak soil layers, and/or drilling activities (i.e.
drilling fluid circulation or advancement of bit).

Fluctuations in the groundwater elevation should be expected depending on precipitation, run-
off, utility leaks, and other factors not evident at the time of our evaluation. Normally, highest
groundwater levels occur in late winter and spring and the lowest levels occur in late summer and
fall. Depending on time of construction, groundwater may be encountered at shallower depths
and locations not explored during this study. If encountered during construction, engineering
personnel from our office should be notified immediately.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 7

4.0 LABORATORY SERVICES
The laboratory testing performed by ECS for this project consisted of selected tests performed on
samples obtained during our field exploration operations. The following paragraphs briefly
discuss the results of the completed laboratory testing program. Classification and index property
tests were performed on representative soil samples obtained from the test borings in order to
aid in classifying soils according to the Unified Soil Classification System and to quantify and
correlate engineering properties.

A geotechnical staff professional visually classified each soil sample from the test borings on the
basis of texture and plasticity in accordance with the Unified Soil Classification System (USCS) and
ASTM D-2488 (Description and Identification of Soils-Visual/Manual Procedures). After
classification, the staff professional then grouped the various soil types into the major zones
noted on the boring logs in Appendix B. The group symbols for each soil type are indicated in
parentheses following the soil descriptions on the boring logs. The stratification lines designating
the interfaces between earth materials on the boring logs are approximate; in situ, the transitions
may be gradual.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 8

5.0 DESIGN RECOMMENDATIONS
5.1 BUILDING DESIGN
The following sections provide recommendations for foundation design, soil supported slabs,
pavements, below grade and site retaining walls and seismic design parameters. ECS was not
provided with information regarding building type, location, or anticipated loading conditions at
the time of this report. This report assumes that maximum column and wall foundations loads for
the structures will not exceed 100 kips and 2 kips per linear foot, respectively.

5.1.1 Foundations
Provided subgrades and structural fills are prepared as discussed herein, the proposed structure
can be supported by conventional shallow foundations: individual column footings and
continuous wall footings. The design of the foundation shall utilize the following parameters:

Table 5.1.1.1 Foundation Design
Design Parameter Column Footing Wall Footing
Net Allowable Bearing Pressure1 2,500 psf
Acceptable Bearing Soil Material
Stratum I, II, III
OR
Newly placed Engineered Fill
Minimum Width 24 inches 18 inches
Minimum Footing Embedment Depth (below
slab or finished grade) 18 inches 18 inches
Estimated Total Settlement Less than 1 inch Less than 1 inch
Estimated Differential Settlement Less than ½ inch between
columns
Less than ½ inch over 50
feet
1. Net allowable bearing pressure is the applied pressure in excess of the surrounding overburden soils
above the base of the foundation.

Most of the soils at the assumed foundation bearing elevation are anticipated to be suitable for
support of the proposed structure. If soft or unsuitable soils such as moisture sensitive soils (MH
soils with a PI greater than 30) are observed at the footing bearing elevations, the unsuitable soils
should be undercut and removed. Any undercut should be backfilled with lean concrete (f’c ≥
1,000 psi at 28 days) up to the original design bottom of footing elevation; the original footing
shall be constructed on top of the hardened lean concrete.

5.1.2 Floor Slabs
The on-site residual soils are considered suitable for support of the floor slabs, although moisture
control during earthwork operations, including the use of discing or appropriate drying
equipment, may be necessary. Most of the existing residual soil is likely suitable for the support
of a slab-on-grade, however, there may be areas of soft or yielding soils, particularly in the vicinity
of Borings B-3, B-4, and B-5 that should be removed and replaced with compacted structural fill in
accordance with the recommendations included in this report.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 9

The following graphic depicts our soil-supported slab recommendations:

Figure 5.1.2.1
1. Drainage Layer Thickness: 4 inches
2. Drainage Layer Material: GRAVEL (GP, GW), SAND (SP, SW)
3. Subgrade compacted to 100% maximum dry density per ASTM D698

Subgrade Modulus: Provided the placement of Structural Fill and Granular Drainage Layer per the
recommendations discussed herein, the slab may be designed assuming a modulus of subgrade
reaction, k1 of 100 pci (lbs/cu. inch). The modulus of subgrade reaction value is based on a 1 ft by
1 ft plate load test basis.

Slab Isolation: Ground-supported slabs should be isolated from the foundations and foundation-
supported elements of the structure so that differential movement between the foundations and
slab will not induce excessive shear and bending stresses in the floor slab. Where the structural
configuration prevents the use of a free-floating slab, the slab should be designed with suitable
reinforcement and load transfer devices to preclude overstressing of the slab. Maximum
differential settlement of soils supporting interior slabs is anticipated to be less than 0.96 of an
inch in 40 feet.

5.1.3 Seismic Design Considerations

Seismic Site Classification: The North Carolina Building Code (NCBC) requires site classification for
seismic design based on the upper 100 feet of a soil profile. Three methods are utilized in
classifying sites, namely the shear wave velocity (vs) method; the unconfined compressive
strength (su) method; and the Standard Penetration Resistance (SPT N-value) method. The SPT
N-value method was used in classifying this site. Based on the weighted average N-value, the
Seismic Site Class is C.

The seismic site class definitions for the weighted average of SPT N-value in the upper 100 feet of
the soil profile are shown in the following table:

Table 5.1.3.1: Seismic Site Classification
Site Class Soil Profile Name SPT Resistance, N-bar N value (bpf)
A Hard Rock Not Applicable N/A
B Rock Not Applicable N/A
C Very dense soil and soft
rock
N-bar > 50 >50
D Stiff Soil Profile 15 ≤ N-bar ≤ 50 15 to 50
E Soft Soil Profile N-bar < 15 <15

Concrete Slab
Vapor Barrier
Granular Capillary Break/Drainage Layer
Compacted Subgrade
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 10

5.2 SITE DESIGN CONSIDERATIONS
5.2.1 Cut and Fill Slopes
ECS does not anticipate cut or fill slopes greater than 10 feet in height. We recommends that
permanent cut slopes with less than 10 feet crest height through undisturbed residual soils be
constructed at 2:1 (horizontal: vertical) or flatter. Permanent fill slopes less than 20 feet tall may
be constructed using engineered fill at a slope of 2.5:1 or flatter. However, a slope of 3:1 or
flatter may be desirable to permit establishment of vegetation, safe mowing, and maintenance.
The surface of cut and fill slopes should be adequately compacted. Permanent slopes should be
protected using vegetation or other means to prevent erosion.

A slope stability analysis should be performed on cut and fill slopes exceeding 10 feet in height to
determine a slope inclination resulting in a factor of safety greater than 1.4. Upon finalization of
site civil drawings, ECS should be contacted to perform slope stability analysis and determine if
further exploration is necessary.

The outside face of building foundations and the edges of pavements placed near slopes should
be located an appropriate distance from the slope. Buildings or pavements placed at the top of
fill slopes should be placed a distance equal to at least 1/3 of the height of the slope behind the
crest of the slope. Buildings or pavements near the bottom of a slope should be located at least ½
of the height of the slope from the toe of the slope. Slopes with structures located closer than
these limits or slopes taller than the height limits indicated should be specifically evaluated by the
geotechnical engineer and may require approval from the building code official.

Temporary slopes in confined or open excavations should perform satisfactorily at inclinations of
2:1. Excavations should conform to applicable OSHA regulations. Appropriately sized ditches
should run above and parallel to the crest of permanent slopes to divert surface runoff away from
the slope face. To aid in obtaining proper compaction on the slope face, the fill slopes should be
overbuilt with properly compacted structural fill and then excavated back to the proposed grades.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 11

6.0 SITE CONSTRUCTION RECOMMENDATIONS
6.1 SUBGRADE PREPARATION
6.1.1 Stripping and Grubbing
The subgrade preparation should consist of stripping all vegetation, rootmat, topsoil, and any
other soft or unsuitable materials 10-foot from buildings and 5-foot from pavement limits and to
5 feet beyond the toe of structural fills. Borings performed in “undisturbed” areas of the site
contained topsoil. Deeper topsoil or organic laden soils may be present in wet, low-lying, and
poorly drained areas. In the wooded areas, the root balls may extend as deep as about 2 feet and
will require additional localized stripping depth to completely remove the organics. ECS should be
called on to verify that topsoil and unsuitable surficial materials have been completely removed
prior to the placement of Structural Fill or construction of structures.

6.1.2 Proofrolling
After removing all unsuitable surface materials, cutting to the proposed grade, and prior to the
placement of any structural fill or other construction materials, the exposed subgrade should be
examined by the Geotechnical Engineer or authorized representative. The exposed subgrade
should be thoroughly proofrolled with previously approved construction equipment having a
minimum axle load of 10 tons (e.g. fully loaded tandem-axle dump truck). The areas subject to
proofrolling should be traversed by the equipment in two perpendicular (orthogonal) directions
with overlapping passes of the vehicle under the observation of the Geotechnical Engineer or
authorized representative. This procedure is intended to assist in identifying any localized
yielding materials. In the event that unstable or “pumping” subgrade is identified by the
proofrolling, those areas should be marked for repair prior to the placement of any subsequent
structural fill or other construction materials. Methods of repair of unstable subgrade, such as
undercutting or moisture conditioning or chemical stabilization, should be discussed with the
Geotechnical Engineer to determine the appropriate procedure with regard to the existing
conditions causing the instability. A test pit(s) may be excavated to explore the shallow
subsurface materials in the area of the instability to help in determined the cause of the observed
unstable materials and to assist in the evaluation of the appropriate remedial action to stabilize
the subgrade.

6.1.3 Subgrade Stabilization
Subgrade Benching: Fill should not be placed on ground with a slope steeper than 5H:1V, unless
the fill is confined by an opposing slope, such as in a ravine. Otherwise, where steeper slopes
exist, the ground should be benched so as to allow for fill placement on a horizontal surface.

Subgrade Stabilization: Is some areas, particularly low-lying, wet areas of the site, undercutting of
excessively soft materials may be considered inefficient. In such areas the use of a reinforcing
geotextile or geogrid might be employed, under the advisement of ECS. Suitable stabilization
materials may include medium duty woven geotextile fabrics or geogrids. The suitability and
employment of reinforcing or stabilization products should be determined in the field by ECS
personnel, in accordance with project specifications. Based on the results of the subsurface
exploration, the near surface soils in the vicinity of Boring B-8 appear to be weak, and soil
remediation will likely be required.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 12

6.2 EARTHWORK OPERATIONS
6.2.1 Below Grade Excavation
We anticipate a majority of the near-surface subgrade soils at the site can be excavated with
backhoes, front-end loaders or other similar equipment using conventional means and methods.
However, please note that preliminary finished floor elevations (FFE), finished grade elevations, as
well as information regarding the depth of the planned utilities were not provided at the time of
this report. Depending on the depth of the planned utilities, difficult excavation into PWR may be
encountered during utility excavation.

Based on the results of the soil test borings and the anticipated cut/fill depths, we do not
anticipate difficult excavation will be encountered. As noted in the Geology section of this report,
the weathering process in the Piedmont can be erratic and significant variations of the depths of
the more dense materials can occur in relatively short distances. In some cases, isolated boulders
or thin rock seams may be present in the soil matrix.

6.2.2 Existing Man-Placed Fill

Existing fill soils were encountered below the surficial materials at each of the boring
locations. The existing fill soils extended to depths ranging from approximately 5 ½ to 8 feet
below the existing ground surface. ECS has not been provided with test records (such as
proofrolling, compaction testing, etc.) at the time of this report, thus the fill should be considered
undocumented. However, based on the SPT N-values in the fill soils, the existing fill soils appear to
have been placed with some compactive effort.

Undocumented fill poses risks associated with undetected deleterious inclusions within the fill
and/or deleterious materials at the virgin ground fill interface that are covered by the fill.
Deleterious materials can consist of significant amount of organics derived from organic rich
strippings, rubbish, construction or demolition debris, stumps and roots, and logs. If these
materials are covered over by or are within undocumented fill, the organic materials tend to
decompose slowly in the anaerobic conditions in or under the fill. Decomposition can occur over
periods ranging from several years to several decades. As the organic materials decompose, a
void is created which can create soft conditions and even subsidence in areas above the organics.
Where these types of conditions exist under or within undocumented fill, they are sometimes in
discreet pockets that can go undetected by normal subsurface exploration techniques, i.e., soil
test borings and test pits.

Based on our evaluation of the existing fill soils, we anticipate the risk of supporting the structures
and pavements on the fill soils is relatively low. However, we anticipate there will be areas in the
existing fill that will need remediation, specifically within the vicinity of Borings B-3, B-4, and B-5.
The risk associated with the existing fill can be lowered by partial undercutting and replacement
with engineered fill.

Since we have not been provided documentation of the compaction testing records, we cannot
qualify the fill soils in between our boring locations and cannot be responsible for potential
settlement of the structure if the owner elects to support the structure on these soils. Bearing the
structure on the existing fill soils is a business decision that only the owner can make.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 13

6.2.3 Structural Fill Materials
Product Submittals: Prior to placement of Structural Fill, representative bulk samples (about 50
pounds) of on-site and off-site borrow should be submitted to ECS for laboratory testing, which
will include Atterberg limits, natural moisture content, grain-size distribution, and moisture-
density relationships for compaction. Import materials should be tested prior to being hauled to
the site to determine if they meet project specifications.

Satisfactory Structural Fill Materials: Materials satisfactory for use as Structural Fill should consist
of inorganic soils classified as CL, ML, SM, SC, SW, SP, GW, GP, GM and GC, or a combination of
these group symbols, per ASTM D 2487. The materials should be free of organic matter, debris,
and should contain no particle sizes greater than 4 inches in the largest dimension. Open graded
materials, such as Gravels (GW and GP), which contain void space in their mass should not be
used in structural fills unless properly encapsulated with filter fabric. Suitable Structural Fill
material should have the index properties shown in Table 6.2.3.1

Table 6.2.3.1 Structural Fill Index Properties
Location LL PI
Building Areas 50 max 30 max
Pavement Areas 50 max 30 max
Retaining Walls 30 max 10 max

Unsatisfactory Materials: Unsatisfactory fill materials include materials which to not satisfy the
requirements for suitable materials, as well as topsoil and organic materials (OH, OL), elastic Silt
(MH) (with a PI greater than 30), and high plasticity Clay (CH). The owner can consider allowing
soils with a maximum Liquid Limit of 65 and Plasticity Index of 30 to be used as Structural Fill at
depths greater than 4 feet below pavement subgrades outside the expanded building limits and
within non-structural areas.

6.2.4 Compaction
Structural Fill Compaction: Structural Fill within the building, pavement, and embankment limits
should be placed in maximum 8-inch loose lifts, moisture conditioned as necessary to within -3
and +3 % of the soil’s optimum moisture content, and be compacted with suitable equipment to a
dry density of at least 95% of the Standard Proctor maximum dry density (ASTM D698) except
within 24 inches of finished soil subgrade elevation beneath slab-on-grade and pavements.
Within the top 24 inches of finished soil subgrade elevation beneath slab on grade and
pavements, the approved project fill should be compacted to at least 100 % of its standard
Proctor maximum dry density. ECS should be called on to document that proper fill compaction
has been achieved.

Fill Compaction Control: The limits of the proposed construction areas should be well defined,
including the limits of the fill zones for buildings, pavements, and slopes, etc., at the time of fill
placement. Grade controls should be maintained throughout the filling operations. All filling
operations should be observed on a full-time basis by a qualified representative of the
construction testing laboratory to determine that the minimum compaction requirements are
being achieved. Field density testing of fills will be performed at the frequencies shown in Table
6.2.4.1, but not less than 1 test per lift.

Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 14

Table 6.2.4.1 Frequency of Compaction Tests in Fill Areas
Location Frequency of Tests
Expanded Building Limits 1 test per 2,500 sq. ft. per lift
Pavement Areas 1 test per 10,000 sq. ft. per lift
Utility Trenches 1 test per 200 linear ft. per lift
Outparcels/SWM Facilities 1 test per 5,000 sq. ft. per lift
Retaining Walls 1 test per 500 sq. ft. per lift
All Other Non-Critical Areas 1 test per 10,000 sq. ft. per lift

Compaction Equipment: Compaction equipment suitable to the soil type being compacted should
be used to compact the subgrades and fill materials. Sheepsfoot compaction equipment should
be suitable for the fine-grained soils (Clays and Silts). A vibratory steel drum roller should be used
for compaction of coarse-grained soils (Sands) as well as for sealing compacted surfaces.

Fill Placement Considerations: Fill materials should not be placed on frozen soils, on frost-heaved
soils, and/or on excessively wet soils. Borrow fill materials should not contain frozen materials at
the time of placement, and all frozen or frost-heaved soils should be removed prior to placement
of Structural Fill or other fill soils and aggregates. Excessively wet soils or aggregates should be
scarified, aerated, and moisture conditioned.

At the end of each work day, all fill areas should be graded to facilitate drainage of any
precipitation and the surface should be sealed by use of a smooth-drum roller to limit infiltration
of surface water. During placement and compaction of new fill at the beginning of each workday,
the Contractor may need to scarify existing subgrades to a depth on the order of 4 inches so that a
weak plane will not be formed between the new fill and the existing subgrade soils.

Drying and compaction of wet soils is typically difficult during the cold, winter months.
Accordingly, earthwork should be performed during the warmer, drier times of the year, if
practical. Proper drainage should be maintained during the earthwork phases of construction to
prevent ponding of water which has a tendency to degrade subgrade soils. Alternatively, if these
soils cannot be stabilized by conventional methods as previously discussed, additional
modifications to the subgrade soils such as lime or cement stabilization may be utilized to adjust
the moisture content. If lime or cement are utilized to control moisture contents and/or for
stabilization, Quick Lime, Calciment® or regular Type 1 cement can be used. The construction
testing laboratory should evaluate proposed lime or cement soil modification procedures, such as
quantity of additive and mixing and curing procedures, before implementation. The contractor
should be required to minimize dusting or implement dust control measures, as required.

Where fill materials will be placed to widen existing embankment fills, or placed up against
sloping ground, the soil subgrade should be scarified and the new fill benched or keyed into the
existing material. Fill material should be placed in horizontal lifts. In confined areas such as utility
trenches, portable compaction equipment and thin lifts of 3 inches to 4 inches may be required to
achieve specified degrees of compaction.

We recommend that the grading contractor have equipment on site during earthwork for both
drying and wetting fill soils. We do not anticipate significant problems in controlling moisture
within the fill during dry weather, but moisture control may be difficult during winter months or
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 15

extended periods of rain. The control of moisture content of higher plasticity soils is difficult
when these soils become wet. Further, such soils are easily degraded by construction traffic when
the moisture content is elevated.

6.3 FOUNDATION AND SLAB OBSERVATIONS
Protection of Foundation Excavations: Exposure to the environment may weaken the soils at the
footing bearing level if the foundation excavations remain open for too long a time. Therefore,
foundation concrete should be placed the same day that excavations are made. If the bearing
soils are softened by surface water intrusion or exposure, the softened soils must be removed
from the foundation excavation bottom immediately prior to placement of concrete. If the
excavation must remain open overnight, or if rainfall becomes imminent while the bearing soils
are exposed, a 1 to 3-inch thick “mud mat” of “lean” concrete should be placed on the bearing
soils before the placement of reinforcing steel.

Footing Subgrade Observations: Most of the soils at the foundation bearing elevation are
anticipated to be suitable for support of the proposed structure. It will be important to have the
geotechnical engineer of record observe the foundation subgrade prior to placing foundation
concrete, to confirm the bearing soils are what was anticipated. If soft or unsuitable soils are
observed at the footing bearing elevations, the unsuitable soils should be undercut and removed.
Any undercut should be backfilled with lean concrete (f’c ≥ 1,000 psi at 28 days) up to the original
design bottom of footing elevation; the original footing shall be constructed on top of the
hardened lean concrete.

Slab Subgrade Verification: A representative of ECS should be called on to observe exposed
subgrades within the expanded building limits prior to Structural Fill Placement to assure that
adequate subgrade preparation has been achieved. A proofroll using a drum roller or loaded
dump truck should be performed in their presence at that time. Once subgrades have been
prepared to the satisfaction of ECS, subgrades should be properly compacted and new Structural
Fill can be placed. Existing subgrades to a depth of at least 10 inches and all Structural Fill should
be moisture conditioned to within +/- 3 percentage points of optimum moisture content then be
compacted to the required density. If there will be a significant time lag between the site grading
work and final grading of concrete slab areas prior to the placement of the subbase stone and
concrete, a representative of ECS should be called on to verify the condition of the prepared
subgrade. Prior to final slab construction, the subgrade may require scarification, moisture
conditioning, and re-compaction to restore stable conditions.

6.4 UTILITY INSTALLATIONS
Utility Subgrades: The soils encountered in our exploration are expected to be generally suitable
for support of utility pipes. The pipe subgrade should be observed and probed for stability by ECS
to evaluate the suitability of the materials encountered. Any loose or unsuitable materials
encountered at the utility pipe subgrade elevation should be removed and replaced with suitable
compacted Structural Fill or pipe bedding material.

Utility Backfilling: The granular bedding material should be at least 4 inches thick, but not less
than that specified by the project drawings and specifications. Fill placed for support of the
utilities, as well as backfill over the utilities, should satisfy the requirements for Structural Fill
given in this report. Compacted backfill should be free of topsoil, roots, ice, or any other material
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 16

designated by ECS as unsuitable. The backfill should be moisture conditioned, placed, and
compacted in accordance with the recommendations of this report.

Excavation Safety: All excavations and slopes should be made and maintained in accordance with
OSHA excavation safety standards. The contractor is solely responsible for designing and
constructing stable, temporary excavations and slopes and should shore, slope, or bench the sides
of the excavations and slopes as required to maintain stability of both the excavation sides and
bottom. The contractor’s responsible person, as defined in 29 CFR Part 1926, should evaluate the
soil exposed in the excavations as part of the contractor’s safety procedures. In no case should
slope height, slope inclination, or excavation depth, including utility trench excavation depth,
exceed those specified in local, state, and federal safety regulations. ECS is providing this
information solely as a service to our client. ECS is not assuming responsibility for construction
site safety or the contractor’s activities; such responsibility is not being implied and should not be
inferred.

6.5 GENERAL CONSTRUCTION CONSIDERATIONS
Moisture Conditioning: During the cooler and wetter periods of the year, delays and additional
costs should be anticipated. At these times, reduction of soil moisture may need to be
accomplished by a combination of mechanical manipulation and the use of chemical additives,
such as lime or cement, in order to lower moisture contents to levels appropriate for compaction.
Alternatively, during the drier times of the year, such as the summer months, moisture may need
to be added to the soil to provide adequate moisture for successful compaction according to the
project requirements.

Subgrade Protection: Measures should also be taken to limit site disturbance, especially from
rubber-tired heavy construction equipment, and to control and remove surface water from
development areas, including structural and pavement areas. It would be advisable to designate
a haul road and construction staging area to limit the areas of disturbance and to prevent
construction traffic from excessively degrading sensitive subgrade soils. Haul roads and
construction staging areas could be covered with excess depths of aggregate to protect those
subgrades. The aggregate can later be removed and used in pavement areas.

Surface Drainage: Surface drainage conditions should be properly maintained. Surface water
should be directed away from the construction area, and the work area should be sloped away
from the construction area at a gradient of 1 percent or greater to reduce the potential of
ponding water and the subsequent saturation of the surface soils. At the end of each work day,
the subgrade soils should be sealed by rolling the surface with a smooth drum roller to minimize
infiltration of surface water.

Excavation Safety: Cuts or excavations associated with utility excavations may require forming or
bracing, slope flattening, or other physical measures to control sloughing and/or prevent slope
failures. Contractors should be familiar with applicable OSHA codes to ensure that adequate
protection of the excavations and trench walls is provided.

Erosion Control: The surface soils may be erodible. Therefore, the Contractor should provide and
maintain good site drainage during earthwork operations to maintain the integrity of the surface
soils. All erosion and sedimentation controls should be in accordance with sound engineering
practices and local requirements.
Stanly County WWTP Rehabilitation 05/03/2018
ECS Project No. 08:12742 Page 17

7.0 CLOSING
ECS has prepared this report of findings, evaluations, and recommendations to guide
geotechnical-related design and construction aspects of the project.

The description of the proposed project is based on information provided to ECS by CASCO
Diversified Corporation and Seaman Development Corporation. If any of this information is
inaccurate, either due to our interpretation of the documents provided or site or design changes
that may occur later, ECS should be contacted immediately in order that we can review the report
in light of the changes and provide additional or alternate recommendations as may be required
to reflect the proposed construction.

We recommend that ECS be allowed to review the project’s plans and specifications pertaining to
our work so that we may ascertain consistency of those plans/specifications with the intent of the
geotechnical report.

Field observations, monitoring, and quality assurance testing during earthwork and foundation
installation are an extension of and integral to the geotechnical design recommendation. We
recommend that the owner retain these quality assurance services and that ECS be allowed to
continue our involvement throughout these critical phases of construction to provide general
consultation as issues arise. ECS is not responsible for the conclusions, opinions, or
recommendations of others based on the data in this report.

APPENDIX A – Drawings & Reports

Site Vicinity Map
Boring Location Diagram

APPENDIX B – Field Operations

Reference Notes for Boring Logs
Boring Logs B-1 through B-5

Reference Notes for Boring Logs (FINAL 08-23-2016).doc © 2016 ECS Corporate Services, LLC. All Rights Reserved
COHESIVE SILTS & CLAYS
UNCONFINED
COMPRESSIVE
STRENGTH, QP
4
SPT5
(BPF)
CONSISTENCY7
(COHESIVE)
<0.25 <3 Very Soft
0.25 - <0.50 3 - 4 Soft
0.50 - <1.00 5 - 8 Medium Stiff
1.00 - <2.00 9 - 15 Stiff
2.00 - <4.00 16 - 30 Very Stiff
4.00 - 8.00 31 - 50 Hard
>8.00 >50 Very Hard

GRAVELS, SANDS & NON-COHESIVE SILTS
SPT5 DENSITY
<5 Very Loose
5 - 10 Loose
11 - 30 Medium Dense
31 - 50 Dense
>50 Very Dense

REFERENCE NOTES FOR BORING LOGS

1Classifications and symbols per ASTM D 2488-09 (Visual-Manual Procedure) unless noted otherwise.
2To be consistent with general practice, “POORLY GRADED” has been removed from GP, GP-GM, GP-GC, SP, SP-SM, SP-SC soil types on the boring logs.
3Non-ASTM designations are included in soil descriptions and symbols along with ASTM symbol [Ex: (SM-FILL)].
4Typically estimated via pocket penetrometer or Torvane shear test and expressed in tons per square foot (tsf).
5Standard Penetration Test (SPT) refers to the number of hammer blows (blow count) of a 140 lb. hammer falling 30 inches on a 2 inch OD split spoon sampler
required to drive the sampler 12 inches (ASTM D 1586). “N-value” is another term for “blow count” and is expressed in blows per foot (bpf).
6The water levels are those levels actually measured in the borehole at the times indicated by the symbol. The measurements are relatively reliable
when augering, without adding fluids, in granular soils. In clay and cohesive silts, the determination of water levels may require several days for the
water level to stabilize. In such cases, additional methods of measurement are generally employed.
7Minor deviation from ASTM D 2488-09.

RELATIVE
AMOUNT7
COARSE
GRAINED
(%)
FINE
GRAINED
(%)
Trace <5 <5
Dual Symbol
(ex: SW-SM)
10 10
With 15 - 20 15-25
Adjective
(ex: “Silty”)
25 - <50 30 - <50
WATER LEVELS6
WL Water Level (WS)(WD)
(WS) While Sampling
(WD) While Drilling
SHW Seasonal High WT
ACR After Casing Removal
SWT Stabilized Water Table
DCI Dry Cave-In
WCI Wet Cave-In
DRILLING SAMPLING SYMBOLS & ABBREVIATIONS
SS Split Spoon Sampler PM Pressuremeter Test
ST Shelby Tube Sampler RD Rock Bit Drilling
WS Wash Sample RC Rock Core, NX, BX, AX
BS Bulk Sample of Cuttings REC Rock Sample Recovery %
PA Power Auger (no sample) RQD Rock Quality Designation %
HSA Hollow Stem Auger
PARTICLE SIZE IDENTIFICATION
DESIGNATION PARTICLE SIZES
Boulders 12 inches (300 mm) or larger
Cobbles 3 inches to 12 inches (75 mm to 300 mm)
Gravel: Coarse ¾ inch to 3 inches (19 mm to 75 mm)
Fine 4.75 mm to 19 mm (No. 4 sieve to ¾ inch)
Sand: Coarse 2.00 mm to 4.75 mm (No. 10 to No. 4 sieve)
Medium 0.425 mm to 2.00 mm (No. 40 to No. 10 sieve)
Fine 0.074 mm to 0.425 mm (No. 200 to No. 40 sieve)
Silt & Clay (“Fines”) <0.074 mm (smaller than a No. 200 sieve)
MATERIAL1,2
ASPHALT
CONCRETE
GRAVEL
TOPSOIL
VOID
BRICK
AGGREGATE BASE COURSE
FILL3 MAN-PLACED SOILS
GW WELL-GRADED GRAVEL
gravel-sand mixtures, little or no fines
GP POORLY-GRADED GRAVEL
gravel-sand mixtures, little or no fines
GM SILTY GRAVEL
gravel-sand-silt mixtures
GC CLAYEY GRAVEL
gravel-sand-clay mixtures
SW WELL-GRADED SAND
gravelly sand, little or no fines
SP POORLY-GRADED SAND
gravelly sand, little or no fines
SM SILTY SAND
sand-silt mixtures
SC CLAYEY SAND
sand-clay mixtures
ML SILT
non-plastic to medium plasticity
MH ELASTIC SILT
high plasticity
CL LEAN CLAY
low to medium plasticity
CH FAT CLAY
high plasticity
OL ORGANIC SILT or CLAY
non-plastic to low plasticity
OH ORGANIC SILT or CLAY
high plasticity
PT PEAT
highly organic soils
0
5
10
15
20
25
30
365
360
355
350
345
340
S-1
S-2
S-3
S-4
S-5
S-6
SS
SS
SS
SS
SS
SS
18
18
18
9
16
15
16
12
14
9
16
14
Topsoil Depth [2"]
(CL FILL) SANDY CLAY, contains slight roots
and rock fragments, grayish brown, moist, stiff
(ML) SANDY SILT, contains slight roots, mica,
and rock fragments, grayish brown, moist, firm
(CL) SANDY CLAY, contains slight rock
fragments, orangish brown, moist, stiff
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS CLAYEY SAND, grayish tan
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS SANDY CLAY, grayish tan
END OF BORING @ 20.0'
6
5
5
5
4
3
2
5
8
29
50/3
12
24
50/4
12
43
50/3
10
7
13
100+
100+
100+
CLIENT
W.K. Dickson, Inc.
Job #:
08:12742
BORING #
B-1
SHEET
PROJECT NAME
Stanly County WWTP Rehabilitation - GEO
ARCHITECT-ENGINEER
SITE LOCATION
24939 Barbees Grove, Oakboro, Stanly County, NC
NORTHING EASTING STATION
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN-SITU THE TRANSITION MAY BE GRADUAL.
WL GNE WS WD BORING STARTED 04/04/18 CAVE IN DEPTH @ 15.7'
WL(SHW)WL(ACR) GNE BORING COMPLETED 04/04/18 HAMMER TYPE Manual
WL RIG SIMCO 2400 FOREMAN Cody Presley DRILLING METHOD 2.25 HSADRILLING METHOD 2.25 HSADEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)SURFACE ELEVATION
DESCRIPTION OF MATERIAL
WATER LEVELSELEVATION (FT)BLOWS/6"10 20 30 40 50+
20% 40% 60% 80% 100%
1 2 3 4 5+
ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION
CALIBRATED PENETROMETER TONS/FT2
PLASTIC
LIMIT %
WATER
CONTENT %
LIQUID
LIMIT %
ROCK QUALITY DESIGNATION & RECOVERY
RQD% REC.%
STANDARD PENETRATION
BLOWS/FT367
1 OF 1
0
5
10
15
20
25
30
365
360
355
350
345
340
S-1
S-2
S-3
S-4
S-5
S-6
SS
SS
SS
SS
SS
SS
18
18
18
18
11
0
18
18
16
18
11
0.1
Topsoil Depth [1"]
(CL FILL) SANDY CLAY, contains slight roots,
rock fragments, and mica, orangish brown,
moist, stiff to very stiff
(CL RESIDUAL) SANDY LEAN CLAY, contains
slight roots and rock fragments, orangish
brown, moist, hard
(SC) CLAYEY SAND, contains slight rock
fragments, grayish tan, moist, very dense
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS SANDY CLAY, grayish tan
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS SANDY CLAY, grayish tan
AUGER REFUSAL @ 17.1'
4
6
12
4
6
9
6
13
20
16
31
48
17
50/5
50/0
18
15
33
79
100+
100+
CLIENT
W.K. Dickson, Inc.
Job #:
08:12742
BORING #
B-2
SHEET
PROJECT NAME
Stanly County WWTP Rehabilitation - GEO
ARCHITECT-ENGINEER
SITE LOCATION
24939 Barbees Grove, Oakboro, Stanly County, NC
NORTHING EASTING STATION
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN-SITU THE TRANSITION MAY BE GRADUAL.
WL GNE WS WD BORING STARTED 04/04/18 CAVE IN DEPTH @ 12.0'
WL(SHW)WL(ACR) GNE BORING COMPLETED 04/04/18 HAMMER TYPE Manual
WL RIG SIMCO 2400 FOREMAN Cody Presley DRILLING METHOD 2.25 HSADRILLING METHOD 2.25 HSADEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)SURFACE ELEVATION
DESCRIPTION OF MATERIAL
WATER LEVELSELEVATION (FT)BLOWS/6"10 20 30 40 50+
20% 40% 60% 80% 100%
1 2 3 4 5+
ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION
CALIBRATED PENETROMETER TONS/FT2
PLASTIC
LIMIT %
WATER
CONTENT %
LIQUID
LIMIT %
ROCK QUALITY DESIGNATION & RECOVERY
RQD% REC.%
STANDARD PENETRATION
BLOWS/FT367
1 OF 1
0
5
10
15
20
25
30
360
355
350
345
340
335
S-1
S-2
S-3
S-4
S-5
S-6
SS
SS
SS
SS
SS
SS
18
18
18
11
5
1
18
14
18
11
5
1
Topsoil Depth [1"]
(CL FILL) SANDY CLAY, contains slight roots,
grayish brown, moist, stiff
(ML) SANDY SILT, contains slight mica and
rock fragments, orangish brown, moist, soft
(ML RESIDUAL) SANDY SILT, contains slight
rock fragments, grayish tan, moist, very hard
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS SANDY CLAY, orangish tan
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS CLAYEY SAND, grayish tan
AUGER REFUSAL @ 16.1'
7
6
5
3
2
1
32
37
40
31
50/5
50/5
50/1
11
3
77
100+
100+
100+
CLIENT
W.K. Dickson, Inc.
Job #:
08:12742
BORING #
B-3
SHEET
PROJECT NAME
Stanly County WWTP Rehabilitation - GEO
ARCHITECT-ENGINEER
SITE LOCATION
24939 Barbees Grove, Oakboro, Stanly County, NC
NORTHING EASTING STATION
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN-SITU THE TRANSITION MAY BE GRADUAL.
WL GNE WS WD BORING STARTED 04/04/18 CAVE IN DEPTH @ 10.2'
WL(SHW)WL(ACR) GNE BORING COMPLETED 04/04/18 HAMMER TYPE Manual
WL RIG SIMCO 2400 FOREMAN Cody Presley DRILLING METHOD 2.25 HSADRILLING METHOD 2.25 HSADEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)SURFACE ELEVATION
DESCRIPTION OF MATERIAL
WATER LEVELSELEVATION (FT)BLOWS/6"10 20 30 40 50+
20% 40% 60% 80% 100%
1 2 3 4 5+
ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION
CALIBRATED PENETROMETER TONS/FT2
PLASTIC
LIMIT %
WATER
CONTENT %
LIQUID
LIMIT %
ROCK QUALITY DESIGNATION & RECOVERY
RQD% REC.%
STANDARD PENETRATION
BLOWS/FT363
1 OF 1
0
5
10
15
20
25
30
355
350
345
340
335
330
325
S-1
S-2
S-3
S-4
S-5
SS
SS
SS
SS
SS
18
18
18
9
1
18
14
18
7
1
Topsoil Depth [1"]
(ML FILL) SANDY SILT, contains slight roots
and rock fragments, grayish brown, moist, stiff
(CL) SANDY CLAY, contains slight roots, mica,
and rock fragments, orangish brown, moist, stiff
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS CLAYEY SAND, grayish tan
AUGER REFUSAL @ 13.1'
3
6
4
3
3
3
3
5
9
45
50/3
50/1
10
6
14
100+
100+
CLIENT
W.K. Dickson, Inc.
Job #:
08:12742
BORING #
B-4
SHEET
PROJECT NAME
Stanly County WWTP Rehabilitation - GEO
ARCHITECT-ENGINEER
SITE LOCATION
24939 Barbees Grove, Oakboro, Stanly County, NC
NORTHING EASTING STATION
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN-SITU THE TRANSITION MAY BE GRADUAL.
WL GNE WS WD BORING STARTED 04/04/18 CAVE IN DEPTH @ 9.5'
WL(SHW)WL(ACR) GNE BORING COMPLETED 04/04/18 HAMMER TYPE Manual
WL RIG SIMCO 2400 FOREMAN Cody Presley DRILLING METHOD 2.25 HSADRILLING METHOD 2.25 HSADEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)SURFACE ELEVATION
DESCRIPTION OF MATERIAL
WATER LEVELSELEVATION (FT)BLOWS/6"10 20 30 40 50+
20% 40% 60% 80% 100%
1 2 3 4 5+
ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION
CALIBRATED PENETROMETER TONS/FT2
PLASTIC
LIMIT %
WATER
CONTENT %
LIQUID
LIMIT %
ROCK QUALITY DESIGNATION & RECOVERY
RQD% REC.%
STANDARD PENETRATION
BLOWS/FT355
1 OF 1
0
5
10
15
20
25
30
355
350
345
340
335
330
S-1
S-2
S-3
S-4
S-5
S-6
SS
SS
SS
SS
SS
SS
18
18
18
11
6
4
4
16
18
11
6
4
Topsoil Depth [2"]
(CL FILL) SANDY CLAY, grayish brown, moist,
soft to firm
(CL) SANDY CLAY, grayish brown, moist, very
stiff
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS SANDY CLAY, grayish tan
(PWR) PARTIALLY WEATHERED ROCK
SAMPLED AS CLAYEY SAND, grayish tan
AUGER REFUSAL @ 17.4'
4
2
2
3
2
4
4
7
10
29
50/5
50/6
50/4
4
6
17
100+
100+
100+
CLIENT
W.K. Dickson, Inc.
Job #:
08:12742
BORING #
B-5
SHEET
PROJECT NAME
Stanly County WWTP Rehabilitation - GEO
ARCHITECT-ENGINEER
SITE LOCATION
24939 Barbees Grove, Oakboro, Stanly County, NC
NORTHING EASTING STATION
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN-SITU THE TRANSITION MAY BE GRADUAL.
WL GNE WS WD BORING STARTED 04/04/18 CAVE IN DEPTH @ 10.5'
WL(SHW)WL(ACR) GNE BORING COMPLETED 04/04/18 HAMMER TYPE Manual
WL RIG SIMCO 2400 FOREMAN Cody Presley DRILLING METHOD 2.25 HSADRILLING METHOD 2.25 HSADEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)SURFACE ELEVATION
DESCRIPTION OF MATERIAL
WATER LEVELSELEVATION (FT)BLOWS/6"10 20 30 40 50+
20% 40% 60% 80% 100%
1 2 3 4 5+
ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION
CALIBRATED PENETROMETER TONS/FT2
PLASTIC
LIMIT %
WATER
CONTENT %
LIQUID
LIMIT %
ROCK QUALITY DESIGNATION & RECOVERY
RQD% REC.%
STANDARD PENETRATION
BLOWS/FT356
1 OF 1
Important Information About Your
Geotechnical Engineering Report
Subsurface problems are a principal cause of construction delays, cost overruns, claims, and disputes
The following information is provided to help you manage your risks.
Geotechnical Services Are Performed for
Specifi c Purposes, Persons, and Projects
Geotechnical engineers structure their services to meet the specifi c needs of
their clients. A geotechnical engineering study conducted for a civil engineer
may not fulfi ll the needs of a construction contractor or even another civil
engineer. Because each geotechnical engineering study is unique, each geo-
technical engineering report is unique, prepared solely for the client. No one
except you should rely on your geotechnical engineering report without fi rst
conferring with the geotechnical engineer who prepared it. And no one - not
even you - should apply the report for any purpose or project except the one
originally contemplated.
Read the Full Report
Serious problems have occurred because those relying on a geotechnical
engineering report did not read it all. Do not rely on an executive summary.
Do not read selected elements only.
A Geotechnical Engineering Report Is Based on
A Unique Set of Project-Specifi c Factors
Geotechnical engineers consider a number of unique, project-specifi c factors
when establishing the scope of a study. Typical factors include: the client’s
goals, objectives, and risk management preferences; the general nature of the
structure involved, its size, and confi guration; the location of the structure
on the site; and other planned or existing site improvements, such as access
roads, parking lots, and underground utilities. Unless the geotechnical engi-
neer who conducted the study specifi cally indicates otherwise, do not rely on
a geotechnical engineering report that was:
• not prepared for you,
• not prepared for your project,
• not prepared for the specifi c site explored, or
• completed before important project changes were made.
Typical changes that can erode the reliability of an existing geotechnical
engineering report include those that affect:
• the function of the proposed structure, as when it’s changed from a
parking garage to an offi ce building, or from alight industrial plant
to a refrigerated warehouse,
• elevation, confi guration, location, orientation, or weight of the
proposed structure,
• composition of the design team, or
• project ownership.
As a general rule, always inform your geotechnical engineer of project
changes - even minor ones - and request an assessment of their impact.
Geotechnical engineers cannot accept responsibility or liability for problems
that occur because their reports do not consider developments of which they
were not informed.
Subsurface Conditions Can Change
A geotechnical engineering report is based on conditions that existed at the
time the study was performed. Do not rely on a geotechnical engineering
report whose adequacy may have been affected by: the passage of time; by
man-made events, such as construction on or adjacent to the site; or by natu-
ral events, such as fl oods, earthquakes, or groundwater fl uctuations. Always
contact the geotechnical engineer before applying the report to determine if it
is still reliable. A minor amount of additional testing or analysis could prevent
major problems.
Most Geotechnical Findings Are Professional
Opinions
Site exploration identifi es subsurface conditions only at those points where
subsurface tests are conducted or samples are taken. Geotechnical engineers
review fi eld and laboratory data and then apply their professional judgment
to render an opinion about subsurface conditions throughout the site. Actual
subsurface conditions may differ-sometimes signifi cantly from those indi-
cated in your report. Retaining the geotechnical engineer who developed your
report to provide construction observation is the most effective method of
managing the risks associated with unanticipated conditions.
A Report’s Recommendations Are Not Final
Do not overrely on the construction recommendations included in your re-
port. Those recommendations are not fi nal, because geotechnical engineers
develop them principally from judgment and opinion. Geotechnical engineers
can fi nalize their recommendations only by observing actual
subsurface conditions revealed during construction. The geotechnical engi-
neer who developed your report cannot assume responsibility or liability for
the report’s recommendations if that engineer does not perform construction
observation.
A Geotechnical Engineering Report Is Subject to
Misinterpretation
Other design team members’ misinterpretation of geotechnical engineer-
ing reports has resulted in costly problems. Lower that risk by having your
geotechnical engineer confer with appropriate members of the design team
after submitting the report. Also retain your geotechnical engineer to review
pertinent elements of the design team’s plans and specifi cations. Contractors
can also misinterpret a geotechnical engineering report. Reduce that risk by
having your geotechnical engineer participate in prebid and preconstruction
conferences, and by providing construction observation.
Do Not Redraw the Engineer’s Logs
Geotechnical engineers prepare fi nal boring and testing logs based upon
their interpretation of fi eld logs and laboratory data. To prevent errors or
omissions, the logs included in a geotechnical engineering report should
never be redrawn for inclusion in architectural or other design drawings.
Only photographic or electronic reproduction is acceptable, but recognize
that separating logs from the report can elevate risk.
Give Contractors a Complete Report and
Guidance
Some owners and design professionals mistakenly believe they can make
contractors liable for unanticipated subsurface conditions by limiting what
they provide for bid preparation. To help prevent costly problems, give con-
tractors the complete geotechnical engineering report, but preface it with a
clearly written letter of transmittal. In that letter, advise contractors that the
report was not prepared for purposes of bid development and that the report’s
accuracy is limited; encourage them to confer with the geotechnical engineer
who prepared the report (a modest fee may be required) and/or to conduct ad-
ditional study to obtain the specifi c types of information they need or prefer.
A prebid conference can also be valuable. Be sure contractors have suffi cient
time to perform additional study. Only then might you be in a position to give
contractors the best information available to you, while requiring them to at
least share some of the fi nancial responsibilities stemming from unantici-
pated conditions.
Read Responsibility Provisions Closely
Some clients, design professionals, and contractors do not recognize that
geotechnical engineering is far less exact than other engineering disciplines.
This lack of understanding has created unrealistic expectations that have led
to disappointments, claims, and disputes. To help reduce the risk of such
outcomes, geotechnical engineers commonly include a variety of explanatory
provisions in their reports. Sometimes labeled “limitations” many of these
provisions indicate where geotechnical engineers’ responsibilities begin
and end, to help others recognize their own responsibilities and risks. Read
these provisions closely. Ask questions. Your geotechnical engineer should
respond fully and frankly.
Geoenvironmental Concerns Are Not Covered
The equipment, techniques, and personnel used to perform a geoenviron-
mental study differ signifi cantly from those used to perform a geotechnical
study. For that reason, a geotechnical engineering report does not usually re-
late any geoenvironmental fi ndings, conclusions, or recommendations; e.g.,
about the likelihood of encountering underground storage tanks or regulated
contaminants. Unanticipated environmental problems have led to numerous
project failures. If you have not yet obtained your own geoenvironmental in-
formation, ask your geotechnical consultant for risk management guidance.
Do not rely on an environmental report prepared for someone else.
Obtain Professional Assistance To Deal with Mold
Diverse strategies can be applied during building design, construction, op-
eration, and maintenance to prevent signifi cant amounts of mold from grow-
ing on indoor surfaces. To be effective, all such strategies should be devised
for the express purpose of mold prevention, integrated into a comprehensive
plan, and executed with diligent oversight by a professional mold prevention
consultant. Because just a small amount of water or moisture can lead to
the development of severe mold infestations, a number of mold prevention
strategies focus on keeping building surfaces dry. While groundwater, wa-
ter infi ltration, and similar issues may have been addressed as part of the
geotechnical engineering study whose fi ndings are conveyed in-this report,
the geotechnical engineer in charge of this project is not a mold prevention
consultant; none of the services performed in connection with
the geotechnical engineer’s study were designed or conducted
for the purpose of mold prevention. Proper implementation of
the recommendations conveyed in this report will not of itself
be suffi cient to prevent mold from growing in or on the struc-
ture involved.
Rely on Your ASFE-Member Geotechnical
Engineer For Additional Assistance
Membership in ASFE/The Best People on Earth exposes geotechnical engi-
neers to a wide array of risk management techniques that can be of genuine
benefi t for everyone involved with a construction project. Confer with your
ASFE-member geotechnical engineer for more information.
8811 Colesville Road/Suite G106, Silver Spring, MD 20910
Telephone:’ 301/565-2733 Facsimile: 301/589-2017
e-mail: [e-mail] www.asfe.org
Copyright 2004 by ASFE, Inc. Duplication, reproduction, or copying of this document, in whole or in part, by any means whatsoever, is strictly prohibited, except with ASFE’s specifi c
written permission. Excerpting, quoting, or otherwise extracting wording from this document is permitted only with the express written permission of ASFE, and only for purposes
of scholarly research or book review. Only members of ASFE may use this document as a complement to or as an element of a geotechnical engineering report. Any other fi rm,
individual, or other entity that so uses this document without being anASFE member could be committing negligent or intentional (fraudulent) misrepresentation.
IIGER06045.0M
The Best People on Earth