NC0025453_authorization to construct_20020726

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
300 S.W. Broad Street • Post Office Box 1737 • Southern Pines, NC 28388
July 26, 2002
Mr. Dave Goodrich
NPDES Permit Group
Division of Water Quality
1617 Mail Service Center
Archdale Building
Raleigh, NC 27699-1617
Re: Town of Clayton WWTP
Authorization to Construct Permit 025453ACD
NPDES Permit No. NCO025453
Johnston County, NC
Dear Mr. Goodrich:
Please find attached my professional engineer's certification for construction of the
improvements and modifications to the Town of Clayton Wastewater Treatment.
Laughlin Sutton Construction Company is substantially complete with this project and the Town
of Clayton has accepted the wastewater treatment plant modifications and placed the project into
operation.
If you have any questions about this matter please contact me at our Southern Pines office.
Sincerely,
,HOOBBS, UPCHURCH & ASSOCIATES, P.A.
Michael Wicker, P.E.
Project Manager
Encl:
cc: Steve Biggs, Town of Clayton
Ken Schuster, Raleigh Regional Office
Bobby Blowe, DWQ-Construction Grants and Loans Section
Tim Spangler, Laughlin Sutton Construction Company
Rick Bounds, HUA JUL 0 2002 CT0002/Permits/400/440 Closeout
DENR -WATER QUALITY
POINT SOURCE BRANCH
Southern Pines, NC • Telephone [phone] Fax [phone] • e-mail: [e-mail]
Myrtle Beach • Nags Head Raleigh 9 Charlotte • Beaufort

PROFESSIONAL ENGINEER'S CERTIFICATION
Full X
I, Michael C. Wicker, P.E. , as a duly registered Professional
Engineer in the State of North Carolina, having been authorized to observe
Periodically the construction of the project.
for the
TOWN OF CLAYTON WWTP UPGRADE
(PROJECT NAME)
TOWN OF CLAYTON, NC, JOHNSTON COUNTY
(PROJECT LOCATION)
ATC PERMIT NO. 025453ACD, May 24, 2001
(PERMIT NO.)
TOWN OF CLAYTON
(OWNER)
hereby states that with the best of my abilites, due care and diligence was used in
the observation of the project construction such that the construction was observed
to be built within substantial compliance and intent of the approved plans and
specifications.
Replacement of two existing Carousel aerators ( one rated at 50 HP to
replace one existing 25 HP aerator, one rated at 75 HP to replace one 50 HP)
Addition of a 65 foot clarifier,
all additional piping, valves, control equipment and appurtenances.
SIGNATURE \ ) � z.'
REGISTRATION NO. NC 11325 DATE 7/26/02
Tire D4vWm of Water Quatit3► hereby
ac�nowtedges receipt and accepmoe of
t� Bngwem Oprdficatlon
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Town of Clayton WWTP Upgrade, CT0002
Walk Through Inspection
Thursday, July 25, 2002
10:00 AM
Attendees:
Tim Simpson, Public Works Director
James Warren, ORC
Tim Spangler, Laughlin, Sutton Construction Company
Norman Herring, Laughlin, Sutton Construction Company
Michael Wicker, Hobbs, Upchurch and Associates
Rick Bounds, Hobbs, Upchurch and Associates
Hudson Shelby, Hobbs Upchurch and Associates
The inspection began at the Headworks and was concluded at the Clarifier. Each item of
construction was inspected and reviewed. All parties expressed their concerns and
expectations respectively to achieve a final punch list. The results are as follows:
Head Works / Pump Station
1. Replace wet well transducer mounting hardware ( unistrut ) with stainless steel
hardware.
2. Remove float cables and stainless steel chain from junction box in wet well and
shorten chain. ( float cables may have to be shortened also )
3. Install air relief on pump no. 2. ( This item has been outstanding for several
months and was addressed several times. )
4. Pump no. 2 control panel will have to be shifted to achieve 3' clearance from any
obstruction and to pass the electrical inspection.
5. Touch up paint (coal tar epoxy ) on new pumps.
6. Replace valve box lid at by pass connection with a lid that reads SEWER.
Aerators
1. Check VFD maximum set point ( reading 52 hz ) for 50 hp aerator.
2. Identify problem with re -start of aerators after power failure or generator
operation.
3. Touch up paint on aerators.
4. Replace cover over slab openings with more substantial protection.
5. Correct sun shield installations so that the filters can be removed.
Weir Gates
1. Touch up paint on gearboxes, hand wheel operators, and paint rusting shafts.

Oxidation Splitter Box
1. Touch up paint on gear box and paint stem to operator handle.
Clarifier Splitter Box
1. Touch up paint on gear operator and paint stem to handle.
Clarifier
1. Touch up paint on interior of feed well prior to placing in service.
2. Touch up paint on clarifier drive.
3. Provide start up report from EIMCO.
4. Clean concrete off of sun shield.
5. Install hand rail at steps.
6. Provide labels for scum pump panel and disconnect.
7. Replace valve box lid to read SEWER.
8. Floats in scum pump station need strain relief.
9. Scum pump heaters are kicking out. ( Pump would not run during test. )
10. After start up, remove sump pump and piping and fill void.
General
1. Fill low areas where water is standing.
2. Seed disturbed areas per the specifications. The owner stated that they would
keep watered. The owner requested that the seed cover be tacked to prevent
displacement during windy conditions.
3. The owner is to review the asphalt area at the head of the filter and determine if
they want the area repaved prior to the expected construction during the next
phase of the construction to the plant.
4. Revised O&M manuals for the clarifier were received this date from Laughlin -
Sutton and four copies distributed to the Town of Clayton WWTP staff. One
copy was retained by HUA for our files.
5. As -built drawings, copies of warranties, release of liens, consent of surety,
completion of punchlist, final pay request, reconciling change order and request
for release of retainage all must be completed by Contractor prior to final
closeout.
6. Attached is the Engineer's Certification and issuance of Substantial Completion.

CERTIFICATE OF SUBSTANTIAL COMPLETION;
PROJECT: Town of Clayton WWTP Improvements
LOCATION: Town of Clayton, NC
OWNER: Town of Clayton
TYPE OF CONTRACT: General, Contract I
DATE OF ACCEPTANCE FOR SUBSTANTIAL COMPLETION: July 25,
2002
CONTRACTOR: Laughlin -Sutton Construction Company
I (we) certify that the work on the above -referenced project has been inspected in
accordance with the engineering services agreement between the Town of Clayton and
Hobbs, Upchurch & Associates, P.A. , and that:
(1) The inspections of the construction, repairs or installations have been
conducted with the degree of care and professional skill and judgment ordinarily
exercised by a member of my (our) profession; and
(2) to the best of my (our) knowledge, and in my (our) professional opinion as
an architect or engineer, the contractor has fulfilled the obligations of such plans,
specifications and contract with the exception of the final punchlist items attached.
Signed this 2 6 day of JULY, 2002
(SEAL)
Michael C. Wicker, P.E. NC11325
Title Hobbs, Upchurch & Associates, Project Manager
1
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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
May 24, 2001
Mr. R. Steven Biggs, Town Manager
Town of Clayton
P.O. Box 879
Clayton, North Carolina 27520
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Authorization to Construct Permit
Clayton/ Little Creek WRF
ATC No. 025453ACD
NPDES Permit NCO025453
Johnston County
Dear Mr. Biggs:
A letter of request for an Authorization to Construct (ATC) submitted on behalf of the Town was
received by the Division of Water Quality July 25, 2000. The request included several plant
modifications, as well as improvements to the oxidation ditch and the addition of a 65 foot clarifier.
The Division's speculative limits letter dated July 10, 2000 had already given approval for all plant
modifications with the exception of the replacement of aerators and the addition of the clarifier at the
Little Creek WRF. Based on the meeting held with the Town, its consultants, and Division personnel
April 25, 2001, the Division has agreed to permit the aforementioned modification and additions.
As also stated in the meeting, this ATC does not provide for additional permitted flow at the
plant, and the permitted flow at the plant remains at 1.9 MGD. The components listed were only
evaluated at the flow and limits specified by the permit at a flow of 1.9 MGD. The Division cannot
guarantee that any components approved for a flow of 1.9 MGD will be adequate to meet the limits and
hydraulic requirements for the future projected flow of 2.5 MGD. After an NPDES permit is issued for
2.5 MGD permitted flow, your consultants may submit calculations to ensure that all components
meet the limits and hydraulic requirements for the 2.5 MGD flow.
Additionally, as specified in the comments to the Environmental Assessment for the expansion to 2.5
MGD permitted flow, the Division encourages the Town to continue to address long range planning
efforts. As also discussed in the meeting, depending on the timing of the expansion and the proposed
formation of the Group Compliance Association, there are two possible pathways associated with
Clayton's nitrogen load allocation to the Neuse River basin. If no Group Compliance Association is
formed, the Town will be required to meet the individual load limit of 21,400 lbs/year and design for
an equivalent nitrogen limit of 3.5 mg/1 at any increase in design flow above 1.9 MGD.
If, and when, a Group Compliance Association is formed, the Town will be required to meet the limit
allocated to the Association. The details of Clayton's responsibilities to reduce total nitrogen will be
governed by the bylaws and agreements made within that organization.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER
VISIT US ON THE WEB AT http://h2o.enr.state.nC.us/NPDES

Mr. Steven Biggs
Town of Clayton
Page 2 of 4
This Authorization to Construct permit includes the approval of the following:
• Replacement of the existing Carousel aerators with new aerators [I rated at 50 Hp, to replace the
existing 25 Hp aerator; 1 rated at 60 Hp, to replace a 50 Hp aerator],
• Addition of a 65 foot diameter clarifier, and
• all additional piping, valves, control equipment and appurtenances.
Once construction under this ATC has been completed and an Engineer's Certificate has been
submitted, the permittee is authorized to operate the modified and/or additional units. The permitted
flow will remain at 1.9 MGD after receipt of the certification.
This Authorization to Construct is issued in accordance with NPDES Permit No. NCO025453
issued August 7, 2000, and shall be subject to revocation unless the wastewater treatment facilities
are constructed in accordance with the conditions and limitations specified in the permit.
The sludge generated from these treatment facilities must be disposed of in accordance with
G.S. 143-215.1 and in a manner approved by the North Carolina Division of Water Quality.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required by
this Division, such as the construction of additional or replacement wastewater treatment or disposal
facilities.
The Raleigh Regional Office, telephone number [phone], shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in -place inspection can be
made. Such notification to the regional supervisor shall be made during the normal office hours from
8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
Upon classification of the facility by the Certification Commission, the Permittee shall employ a
certified water pollution control treatment system operator to be in responsible charge (ORC) of the
water pollution control treatment system. The operator must hold a certificate of the type and grade at
least equivalent to or greater than the classification assigned to the water pollution control treatment
system by the Certification Commission. The Permittee must also employ a certified back-up operator
of the appropriate type and grade to comply with the conditions of Title 15A, Chapter 8G, .0202. The
ORC of the facility must visit each Class I facility at least weekly and each Class II, III, and IV facility
at least daily, excluding weekends and holidays, and must properly manage and document daily
operation and maintenance of the facility and must comply with all other conditions outlined in Title
15A, Chapter 8G, .0204. Once the facility is classified, the Permittee must submit a letter to the
Certification Commission which designates the operator in responsible charge within: (A) Sixty
calendar days prior to wastewater being introduced into a new system or (B) within 120 calendar days
of the following, (i) after receiving notification of a change in the classification of the system requiring
the designation of a new ORC and back-up ORC or (ii) a vacancy in the position of ORC or back-up
ORC.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for
the life of the facility.
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance with
the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S.
143-215.6 for violation of or failure to act in accordance with the terms and conditions of this Permit.

Mr. Steven Biggs
Town of Clayton
Page 3 of 4
Failure to abide by the requirements contained in this Authorization to Construct may subject
the Permittee to an enforcement action by the Division of Water Quality in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying
with any and all statutes, rules, regulations, or ordinances which may be imposed by other
government agencies (local, state, and federal) which have jurisdiction.
Upon completion of construction and prior to operation of this permitted facility, a certification
must be received from a professional engineer certifying that the permitted facility has been installed
in accordance with the NPDES Permit, this Authorization to Construct and the approved plans and
specifications. Mail the Certification to the NPDES Unit, Division of Water Quality, 1617 Mail Service
Center, Raleigh, NC 27699-1617.
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contact Ms. Susan A, Wilson, P.E., telephone number
[phone], extension 510.
Sincerely,
err T. Stevens
cc: Central Files
NPDES Unit, Permit File
Raleigh Regional Office, Water Quality
Technical Assistance and Certification, Tony Arnold
Michael Wicker, P.E. Hobbs, Upchurch & Ass.
290 SW Broad St.
Southern Pines, NC 28388

Clayton
NC0025453
ATC No. 025453ACD
Notes to file, 5/22/01
ATC Request in-house: 7/25/00
n
Numerous items with this ATC, most minor mods for better O&M.
Approved most minor mods. via letter 7/12/00 with speculative limit letter. Did not
approve modification of aerators in oxidation ditch or proposed new clarifier [believed
this would be all that was needed to bring Clayton to a design flow of 2.5 MGD, when
they are currently only permitted for 1.9 MGD]. Clayton is currently in the EA process
and if a FONSI is issued, the town will apply for expansion to 2.5 MGD.
4/25/01 - met with Clayton officials, consultants, and Central Jo Co folks. Wanted to
learn more about future plans and warn them of the consequences of moving forward
w/o nitrogen removal. Also told them we would move forward with approval of aerators
and clarifier - but would review only for 1.9 MGD and they would move forward at their
own risk. Obligated ourselves to approval by 5/25/01, so they could go forward with
contract.
This approval encompasses:
• Exchange of 1, 25 Hp aerator in 0.75 MG ditch for 1, 50 Hp aerator
• Exchange of 1, 50 Hp aerator in 1.15 MG ditch for 1, 60 Hp aerator
• Construction of 65' dia. Clarifier
Clayton has 2 existing clarifiers, the above proposal will provide a 3rd. But from
consultant's write-up it appears one of the clarifiers will be taken down and the 2 larger
clarifiers will be used (existing 55' dia. Clarifier).
Assume 60% of flow to 65' clarifier, 40% of flow to 55' clarifier (% based on diameters -
just assumed for review of project at 1.9 MGD - will ask for more information upon
review at 2.5 MGD). SWD = 14'
1.9 * (0.60) = 1.14 MGD (avg)
Peak = 1.14 * 2.5 = 2.85 MGD
Overflow rate = 1,140,000 GPD/7r (65/2)2
= 344 gpd/ft2 (typical)
Peak overflow = 2,850,000 gpd /7r (65/2)2
= 859 gpd/ft2 (slightly high - range is 600-800 for extended aeration)
Solids loading - assume 4500 mg/l MLSS (given by consultant - will require more
specific detail with 2.5 MGD review)
4500 * 8.34 * 1.14 = 42,784 lbs/day = 1783 lbs/hr
Solids loading = 1783/Tr (65/2)2= 0.54 lbs/ft2-hr (OK, in range)

4
Peak solids loading
4500 * 8.34 * 2.85 = 106,961 lbs/day = 4457 lbs/hr
Peak solids loading = 4457/n (65/2)2= 1.34 lbs/ft2*hr (010
Also recommended that r < 5*SWD
65/2 < 5* 14
32.5<70 (OKQ
Weir loading - 1,140,000/2nr
= 5616 gpd/ft (OIL
Aerators - since aerators are being increased for mixing/aeration - did not review
increase in aeration or mixing for the current flow of 1.9 MGD. Clayton is currently well
under limits and this addition will likely provide even better mixing at the current flow.
However, upon re -rating to 2.5 MGD, this will be carefully reviewed to ensure that tertiary
limits presented in the permit will be met.
G

STAFF REPORT AND RECOMMENDATIONS
FOR AUTHORIZATION TO CONSTRUCT A NEW CLARIFIER,
AERATION SYSTEM IMPROVEMENTS, AND INFLUENT PUMP
REPLACEMENTS AT THE TOWN OF CLAYTON — LITTLE CREEK
SOC PRIORITY PROJECT: Yes _ No X
If Yes, SOC No.:
Date: May 9, 2001
To: NPDES Perimiittirig.Uhit
Attenti�in Susan Wilson
'-- ----
County: Johnston
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Permit No.: NCO025453
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ATC Permit No.: 025453ACD
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PART I - GENERAL INFORMATIONS
'
1. Facility Location: Town of Clayton - Little Creek WWTP
Durham Street Extension
Clayton, NC
Mailing Address: Mr. Steve Biggs, Town Manager
P.O. Box 879
Clayton, NC 27520
2. Report Prepared by: Timothy D. Baldwin
3. Date of most recent NPDES Staff Report (attach copy): February 16, 1998
4. Changes since previous action on NPDES Permit: None
5. Discharge Point(s), list for all discharge points:
Latitude: 35° 39' 50" Longitude: 78' 25' 26"
Authorization to Construct Staff Report
Page 1

Attach a USGS map extract and indicate treatment facility site and discharge point on map.
USGS Quad No.: E25NW USGS Quad Name: Clayton, NC
6. Treatment plant classification (attach completed rating sheet): Grade III Biological WPCS
PROVIDE ADDITIONAL INFORMATION FOR PARTS I, II, AND III ONLY IF IT IS
NOT PROVIDED IN ATTACHED STAFF REPORT
7. Date of Site Visit:
8. Persons Contacted and Telephone Number:
9. Directions to Site:
10. Site size and expansion area consistent with application? Yes: _ No: _
If No, explain:
11. Topography (relationship to flood plain included):
12. Location of nearest dwelling:
13. Receiving stream or affected surface waters:
a. Classification:
b. River Basin and Subbasin No.:
C. Describe receiving stream features and pertinent downstream uses:
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: 1.9 MGD
b. What is the current permitted capacity of the facility? 1.9 MGD
C. Actual treatment capacity of the current facility (current design capacity)? 1.9 MGD
d. Date(s) and construction activities allowed by previous Authorization to Construct
issued in the previous two years: None
Authorization to Construct Staff Report
Page 2

e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: Automatic and manual barscreens, grit removal, primary
clarifier, trickling filter, secondary clarifier, 2 oxidation ditches, 2 secondary
clarifiers, tertiary filters, UV disinfection, drum sludge thickener, aerobic
digester, sludge storage tank, sludge drying beds.
f. Please provide a description of proposed wastewater treatment facilities: Additional
clarifier.
g. Possible toxic impacts to surface waters: None
h. Pretreatment Program (POTWs only):
in development: _ approved: _
should be required: _ not needed: _
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DWQ permit no.:
Residual Contractor:
Telephone No.:
b. Residuals stabilization: PSRP: _ PFRP:
Other:
C. Landfill:
d. Other disposal/utilization scheme (Specify):
3. SIC Code(s):
4. Wastewater Code(s) of actual wastewater, not particular facilities i.e.., non -contact cooling
water discharge from a metal plating company would be 14, not 56. Include more than one
code if applicable:
5. Main Treatment Unit Code: 101-1
Authorization to Construct Staff Report
Page 3

PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public
monies involved. (municipals only)? No (local funds)
2. Special monitoring or limitations (including toxicity) requests: None
3. Important SOC, JOC or Compliance Schedule dates: (Please indicate)
Date
Submission of Plans and Specifications
Begin Construction
Complete Construction
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge options
available? Please provide regional perspective for each option evaluated.
Spray Irrigation: Not Evaluated
Connection to Regional Sewer System: Not Evaluated
Subsurface: Not Evaluated
Other disposal options: Not Evaluated
Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
The Raleigh Regional Office has reviewed the current submittal package requesting
Authorization to Construct (ATC) a new clarifier, aeration system improvements, and pump
replacements at the Town of Clayton - Little Creek WWTP facility. Our staff has reviewed
our files of the above referenced site, as well as the plans and specifications submitted, in order
to make the following comments and recommendations for the request.
Authorization to Construct Staff Report
Page 4

0
The RRO does not have any concerns with the proposed addition of a clarifier and other
modifications to the facility. We are, however, concerned that the project and application do
not properly address the flow problems that the Town is currently having. The. Town
currently has sewer projects "backed up" that more than consume their allowable paper flow
capacity, and they have recently reconciled their flow, and applied for a per -unit flow
reduction. It appears as if the Town will not have the capacity to allow any growth beyond
what has already been proposed. The most disturbing aspect of this is that this project does
not provide any new flow capacity at the WWTP, and there do not appear to be any new
projects proposed to provide any new flow capacity in the near future. The RRO strongly
recommends that the Town of Clayton look for ways to increase their flow capacity as soon as
possible.
Based on the above, the RRO recommends that the subject project be awarded an ATC as
requested, pending NPDES Permitting Unit satisfaction of all requirements.
Signature of
Water Quality Regional Supervisor
Permit No. NC0025453
ATC No. 025453ACD
File: h:\atc-sr\ac25453d.sr
-S7/?/o
Authorization to Construct Staff Report
Page 5

DOUGLAS A. McCORMAC
Mayor
RONALDE.GURGANUS
Mayor Pro Tem
STEVEN BIGGS
Town Manager
JASON L KAUS
Town Attorney
SUE CANADAY, CMC
Town Clerk
Town of Clayton
July 14, 2000
Mr. Dave Goodrich
NPDES Permit Group
Division of Water Quality
512 North Salisbury Street,
Archdale Building
Raleigh, NC 27626
Re: Authorization to Construct Permit
Town of Clayton
Clayton WWTP
NPDES Permit No. NCO025453
Johnston County, NC
Dear Mr. Goodrich:
COUNCIL MEMBERS
ROBERT J. AHLERT
JAMES H. LIPSCOMB
BOB SATTERFIELD
BUTCH LAWTER
We are requesting an Authorization to Construct Permit from the Division of Water Quality for
upgrades to the Town of Clayton Wastewater Treatment Facility.
The wastewater treatment plant upgrades requested for permitting include the following:
a. ,/ Replace existing extended shaft centrifugal pumps with submersible centrifugal
pumps in the dry pit and add variable frequency drives to control pumps in
relation to influent flows.
b. Improvements to oxidation ditch aeration efficiency by replacing existing
Carousel aerators.
C. The addition of a 65 foot clarifier for redundancy.
The following items are currently being contracted for construction by the Town of Clayton
since they do not require permitting by DENR.
a. Improvement to the existing hydraulic split at influent pump station by the
addition of a slide gate for diversion to the existing intermediate pump station,
which pumps to trickling filter system. Concrete wall additions to the structure to
help with surface flooding during high rainfall.
b. Improvements to existing oxidation splitter box by adding slide gates to allow
control of flow split to each oxidation ditch.
P.O. Box 879 • Clayton, North Carolina 27520 • [phone] • Fax [phone]

c. Improvements to existing clarifier splitter box by adding slide gates to allow
control of flow split to each clarifier.
d. -'Improvements to existing clarifier hydraulics by installation of Stamford Baffles.
e. duplication of existing WWTP polymer feed system through additional polymer
feed piping to the clarifiers and additional polymer pumps for redundancy.
f. ,-Separation of RAS/WAS pump piping by additional WAS piping to allow RAS
and WAS to operate concurrently. Replacement of the existing RAS pumps with
new pumps.
g. 7 Additional float controls in the tertiary filter backwash wetwell to allow multiple
ol� - pump operation.
The above changes will aid the operator to control flow, replace old units, improve sludge
handling and backwash filters more effectively and therefore run the WWTP more efficiently.
The overall process will not change. No increase in the NPDES permitted flow is requested for
this modification. The plans and specifications reflect all the above changes.
Please find attached three sets of plans, specifications, design calculations and construction
sequence. A separate copy has been forwarded to the Raleigh Regional Office. Hobbs,
Upchurch & Assoc., P.A. are our consulting engineers on the project and should be copied on all
correspondence.
If you have any further questions about this matter, please contact myself at 919-553-5002 or
Michael Wicker, P.E., of Hobbs, Upchurch & Assoc.,P.A. at 910-692-5616.
Sincerely,
7 r1
OKI
Steve Biggs
Town Manager
Attachments
cc: Ken Schuster, Raleigh Regional Office
Michael Wicker, Hobbs, Upchurch & Associates, P.A.