WQ0015102_Final Permit_19980615

S'tate of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
June 15, 1998
Mr. T. Mayne Hill
Hill Oil Company, Inc.
P.O. Box 367
Lexington, NC 27292
Dear Mr. Hill:
1 " •
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Permit No. WQ0015102
Hill Oil Company, Inc.
Walser's Service
Groundwater Remediation Facilities
Davidson County
In accordance with your application received March 16, 1998, we are forwarding herewith Permit No.
WQ0015102, dated June 15, 1998, to the Hill Oil Company, Inc. for the construction and operation of the
subject groundwater remediation facility.
This permit shall be effective from the date of issuance until May 31, 2003 and shall be subject to the
conditions and limitations as specified therein. Please pay particular attention to the monitoring requirements
in this permit. Failure to establish an adequate system for collecting and maintaining the required operational
information will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right
to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit.
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, P.O. Drawer 27447, Raleigh, NC
27611-7447. Unless such demands are made this permit shall be final and binding.
If you have any questions concerning the Groundwater Conditions or groundwater monitoring
requirements, please contact Mr. Brian Wootton in the Groundwater Section at 919-715-6164. If you need any
additional information concerning this matter, please contact Mr. Randy Kepler at [phone] extension
544. J
cc: Davidson County Health Department
Geo-Environmental Consultants, Inc.
Winston-Salem Regional Office, Water Quality Section
Winston-Salem Regional Office, Groundwater Section
Bob Cheek, Groundwater Section, Central Office
Technical Assistance and Certification Unit
Non -Discharge Compliance/Enforcement Unit
PO Box 29535, Raleigh, North Carolina 27626-0535
An Equal Opportunity Affirmative Action Employer
9 �'
A. Preston Howard, Jr., P.E.
Telephone [phone] Fax [phone]
50% recycled/10% post -consumer paper

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
GROUNDWATER REMEDIATION PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Hill Oil Company
Davidson County
FOR THE
construction and operation of a 1,440 GPD groundwater remediation facility consisting of a recovery well
with a 4" GED controllerless recovery pump, an oil/water separator, 250 gallon surge tank with low and high
level switches, BAG filter, transfer pump, a stackable tray aerator, a flow totalizer, a storage tank, one
injection well with emergency float switches, a groundwater collection system with an adjustable rate
recovery pump and air sparging wells powered by a 7.5 horsepower rotary screw compressor and one vapor
extraction well driven by an explosion proof regenerative 280 CFM blower, all to serve Hill Oil Company,
Walser's Service, with no discharge of wastes to the surface waters, pursuant to the application received
March 16, 1998, and in conformity with the project plan, specifications, and other supporting data
subsequently filed and approved by the Department of Environment and Natural Resources and considered a
part of this permit.
This permit shall be effective from the date of issuance until May 31, 2003 and shall be subject to the
following specified conditions and limitations:
IIli 9319 011135 /4las1*31 V`117_\.3l7.�
1. 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 this permit, the approved plans and specifications, and other
supporting materials. If this project is to be completed in phases and partially certified, you shall
retain the responsibility to track further construction approved under the same permit, and shall
provide a final certificate of completion once the entire project has been complete . Mail the
Certification to the Non -Discharge Permitting Unit, P.O. Box 29535, Raleigh, NC 27626-0535.
2. The Winston-Salem Regional Office, telephone number 336-771-4600, 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.

3. This permit shall become voidable if the soils fail to adequately assimilate the wastes and may be
rescinded unless the facilities are installed, maintained, and operated in a manner which will
protect the assigned water quality standards of the surface waters and ground waters.
4. 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 actions that may
be required by the Division of Water Quality (Division), such as the construction of additional or
replacement treatment or disposal facilities.
The issuance of this permit shall not relieve the Permittee of the responsibility for damages to
surface or groundwaters resulting from the operation of this facility.
6. Any residuals generated from these treatment facilities must be disposed in accordance with
General Statute 143-215.1 and in a manner approved by the Division.
7. Diversion or bypassing of the untreated groundwater from the treatment facilities is prohibited.
8. Construction shall be completed as required in the Corrective Action Plan for this facility.
Completion of the engineer's certification of completion with confirm this requirement has been
met.
II. OPERATION AND MAINTENANCE REQUIREMENTS
1. The facilities shall be properly maintained and operated at all times.
2. Upon classification of the facility by the Water Pollution Control Systems Operators Certification
Commission (WPCSOCC), the Permittee shall employ a certified wastewater treatment plant
operator to be in responsible charge (ORC) of the wastewater treatment facilities. The operator
must hold a certificate of the type and grade at least equivalent to or greater than the classification
assigned to the wastewater treatment facilities by the WPCSOCC. The Permittee must also
employ a certified back-up operator of the appropriate type and grade to comply with the
conditions of 15A NCAC 8A .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 of 15A NCAC 8A .0202. Once the facility is
classified, the Permittee must submit a letter to the WPCSOCC which designates the operator in
responsible charge within thirty days after the wastewater treatment facilities are 50% complete.
3. The facilities shall be effectively maintained and operated as a non -discharge system to prevent
the discharge of any wastewater resulting from the operation of this facility.
III. MONITORING AND REPORTING REQUIREMENTS
1. Any monitoring deemed necessary by the Division to insure surface and ground water protection
will be established and an acceptable sampling reporting schedule shall be followed.
2. Noncompliance Notification:
The Permittee shall report by telephone to the Winston-Salem Regional Office, telephone number
336-771-4600, 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 groundwater remediation facility which results in the treatment of
significant amounts of contaminated groundwaters which are abnormal in quantity or
characteristic, such as the dumping of the contents of a basin or tank, the known passage
of a slug of hazardous substance through the facility, or any other unusual circumstances;
2

b. Any process unit failure, due to known or unknown reasons, that renders the groundwater
treatment and disposal system incapable of adequate treatment and disposal, 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
directly to receiving waters without treatment of all or any portion of the influent to such
station or facility; or
d. Any time that self -monitoring information indicates that the groundwater treatment and
disposal system is not in compliance with any specified permit limitations.
Persons reporting such occurrences by telephone shall also file a written report in letter form
within five days following first knowledge of the occurrence. This report must outline the actions
taken or proposed to be taken to ensure that the problem does not recur.
IV. GROUNDWATER REQUIREMENTS
The effluent from the treatment system shall be sampled initially after system startup then once
every 2 weeks for the first three months , then monthly thereafter using EPA Methods 601 and
602 with IPE, MTBE, EDB, Xylenes, and Massachusetts Department of Environmental
Protection Volatile Petroleum Hydrocarbons (MADEP VPH) and lead (3030C prep), water level,
and pH. (Naphthalene not needed).
One copy of the results of the sampling and analysis must be received by the Groundwater
Section, Permits and Compliance Unit, P.O. Box 29578 Raleigh, N.C. 27626-0578 and one copy
shall be sent to the Winston-Salem Regional Office, address 585 Waughtown Street Winston-
Salem, NC 27107, on or before the last working day of the month following the sampling event.
2. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall be
provided.
The COMPLIANCE BOUNDARY for the disposal system is specified by regulations in 15A
NCAC 2L, Groundwater Classifications and Standards. The Compliance Boundary is for the
disposal system constructed after December 31, 1983 is established at either (1) 250 feet from the
waste disposal area, or (2) 50 feet within the property boundary, whichever is closest to the waste
disposal area. An exceedance of Groundwater Quality Standards at or beyond the Compliance
Boundary is subject to immediate remediation action in addition to the penalty provisions
applicable under General Statute 143-215.6A(a)(1).
In accordance with 15A NCAC 2L, a REVIEW BOUNDARY is established around the disposal
systems midway between the Compliance Boundary and the perimeter of the waste disposal area.
Any exceedance of standards at the Review Boundary shall require remediation action on the part
of the permittee.
4. All components of the groundwater recovery, treatment, and disposal system shall be properly
weather -proofed to prevent freezing and failure of the system.
The groundwater recovery, treatment and disposal system shall be inspected monthly. If it is
determined that the system is malfunctioning, all repairs should be made as soon as possible and
reported to the Winston-Salem Regional Office within 48 hours.
The groundwater treatment system shall consistently achieve a treatment efficiency which insures
the waters discharged to the injection wells is at or below 15A NCAC 2L groundwater standards
prior to discharge to the injection well. If the treatment system fails to consistently achieve this
standard, additional treatment units or changes in operational methods, may be required.

7. The permittee shall submit a report outlining the injection volumes and pressures of the injection
wells. This report may be submitted along with all other monitoring data.
8. Flow measurement devices shall be installed to monitor the volumes injected at each well. Also
each wellhead shall be equipped to measure the injection pressure at the screened interval.
9. Prior to operation of the groundwater remediation system, the permittee shall certify the
mechanical integrity of the injection wells as defined by 15A NCAC 2C .0207. Additionally, an
engineering certification shall be provided stating that the injection wells have been constructed
in accordance with 15A NCAC 2C .0200 and the conditions of this permit. This certification
shall be forwarded to the Groundwater Section Permits Unit, P.O. Box 29578, Raleigh, NC,
27626-0578 prior to operation of the system.
10. Pursuant to rule 15A NCAC 2C .0211(g), injection may not commence until construction of the
injection wells is completed, the permittee has submitted notice of completion of construction to
the Winston-Salem Regional Office, and the regional office staff has inspected or otherwise
reviewed the injection well and finds it in compliance with the permit. If the permittee has not
received notice from the Winston-Salem Regional Office of the intent to inspect or otherwise
review the injection well within 10 days after the regional office has received the notice, the
permittee may commence operation of the injection wells.
11. The permittee shall retain copies of records of all monitoring information, including all
calibration and maintenance records, all original strip chart recordings for continuous monitoring
instrumentation and copies of all reports required by this permit, for a period of at least 3 years
from the date of the sample, measurement, report or application. Records of this monitoring
information shall include, but not be limited to, the following:
a. the date, exact place, and time of sampling or measurements,
b. the individual who performed the sampling or measurements,
c. the date the analyses were performed,
d. the analytical techniques or methods used, and
e. the results of any such sampling, measurements, and analyses.
12. The permittee shall report any monitoring or other information which indicates that any
contaminant may cause an endangerment to an underground source of drinking water and any
noncompliance with a permit condition of malfunction of the injection system which may cause
fluid migration outside the injection zone or area. The information shall be provided to the
Winston-Salem Regional Office orally within 8 hours of the occurrence and as a written
submission within five days of the occurrence. 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 any steps taken or planned to reduce, eliminate and prevent reoccurrence of the
noncompliance.
V. INSPECTIONS
1. Adequate inspection, maintenance and cleaning shall be provided by the Permittee to insure
proper operation of the subject facilities.
2. The Permittee or his designee shall inspect the groundwater recovery and treatment facilities to
prevent malfunctions and deterioration, operator errors and discharges which may cause or lead
to the release of wastes to the environment, a threat to human health, or a nuisance. The
Permittee shall maintain an inspection log or summary including at least the date and time of
inspection, observations made, and any maintenance, repairs, or corrective actions taken by the
Permittee. This log of inspections shall be maintained by the Permittee for a period of three years
from the date of the inspection and shall be made available to the Division or other permitting
authority, upon request.
4

Any duly authorized officer, employee, or representative of the Division may, upon presentation
of credentials, enter and inspect any property, premises or place on or related to the disposal site
or facility at any reasonable time for the purpose of determining compliance with this permit, may
inspect or copy any records that must be maintained under the terms and conditions of this
permit, and may obtain samples of groundwater, surface water, or leachate.
VI. GENERAL CONDITIONS
1. Issuance of this permit does not constitute approval for reimbursement from the Leaking
Petroleum Underground Storage Tank Cleanup Funds (15A NCAC 2P).
2. This permit shall become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other supporting data.
3. This permit is effective only with respect to the nature and volume of wastes described in the
application and other supporting data.
4. This permit is not transferable. In the event there is a desire for the facilities to change
ownership, or there is a name change of the Permittee, a formal permit request must be submitted
to the Division accompanied by an application fee, documentation from the parties involved, and
other supporting materials as may be appropriate. The approval of this request will be considered
on its merits and may or may not be approved.
A set of approved plans and specifications for the subject project must be retained by the
Permittee for the life of this project.
6. Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to an enforcement action by the Division in accordance with North Carolina General
Statute 143-215.6A to 143-215.6C.
7. The annual administering and compliance fee must be paid by the Permittee within thirty (30)
days after being billed by the Division. Failure to pay the fee accordingly may cause the Division
to initiate action to revoke this permit as specified by 15A NCAC 2H .0205 (c)(4).
8. The issuance of this permit 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.
9. The Permittee, at least six (6) months prior to the expiration of this permit, shall request its
extension. Upon receipt of the request, the Commission will review the adequacy of the facilities
described therein, and if warranted, will extend the permit for such period of time and under such
conditions and limitations as it may deem appropriate.
Permit issued this the Fifteenth day of June, 1998
NORTH CA INA E O TAL MANAGEMENT COMMISSION
7t J A. Freston Howard, r., F.E. , Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0015102

Permit No. WQ0015102
June 15, 1998
ENGINEER'S CERTIFICATION
Partial Final
I, , as a duly registered Professional Engineer in the State of
North Carolina, having been authorized to observe (periodically, weekly, full time) the construction of the
project,
Project Name
Location and County
for the Permittee hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the construction such that the construction was observed to be built within substantial
compliance and intent of this permit, the approved plans and specifications, and other supporting materials.
Signature
Date
Registration No.
6

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p EXISTING WELL TO BE USED FOR VERW WELL
(1) LOCATION OF INJECTION WELL
LOCATION AND NUMBER OF PROPOSED Al WELLS
EXISTING WELL TO BE USED FOR Al WELL
p SUPPLY WELL
...... LOCATION OF SYSTEM TRENCHING
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PROJECTr. ,970M
GEO -ENVIRONMENTAL
DATE: 12/31/97
CONSULTANTS, INC.
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PRDXCT WGR: S.E.L
GEOTECHNICAL/ENVIRONUEHTAt ENGINEERS R SCIENTISTS
DESIGN BY: K.A.A.
L
11704 REAMES ROAD, CHARLOTTE, NC 28269-7637
DRAWN BY: T.B.L.
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PHONE [phone] FAx [phone]TFE4

DATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility: U' D wG 1 I e.
Owner or Contact Pers,9n: %
Mailing Address: rlL a�
County: C' T lephone: 70 c2 ID
Present. Classification: New Facility Existing Facility
NPDES Per. No. NCOO Nondisc. Per. No.WQ 00 16 10 Health Dept.Per No.
Rated by: 0--p5. -e 1 `lGd� Da#e: '75,
Reviewed by: Health Dept. Telephone:
Regional Office Telephone:
Central Office Telephone:
ORC: Grade: Telephone:
Check Classification(s): Subsurface Spray Irrigation Land Application
Wastewater Classification: (Circle One) Q it 111 IV Total Points:
♦ � :.\I 'ii� :►■ �� : l ■ �\IEa� �. ltpu +\I Ala �.: :� ►11� . .:1 7t ►■ � 1:: rC*ii 1fi► ��: ►�
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SUBSURFACE CtA&NRCATION
(check all units that. apply)
1_ septic tanks
2. pump tanks
3. siphon or pump -dosing systems
4. sand tillers
5. grease trapfinterceptor
6_ oil/water separators
7. gravity subsurface treatment and disposal:
8, pressure subsurface treatment and disposal:
---------------------------------
SPRAY IRRlGATfCN CiAS.SiFfCATION
(check all units that apply)
1.
preliminary treatment (definition no. 32 )
2.
lagoons
3.
septic tanks
4,
pump tanks
5.
pumps
6.
sand filters
7.
grease trap£nterceptor
B.
oil/water separators
9.
disinfection
10.
chemical addition for nutrient/algae control
11_
spray irrigation of wastewater
In addition to the above classifications, pretreatment of wastewater in excess of these components shall
be rated using the point rating system and will require an operator with an appropriate dual certification.
LAND APPLICATIO"ESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of biosolids, residuals or contaminated soils on a designated site.
WASTEWATER TREATMENT FACILITY CIASSIFICATiON.
The following systems shall be assigned a Class I classificalicn, unless the flow is of a significant quantity or the technology is unusually
complex, to require consideration by the Commission on a case -by -case basis: (Check it Appropriate)
1. dillwater Separator Systems consisting only of physical separation, pumps and disposal;
2. Septic Tank/Sand Filter Systems consisting only of seplic tanks, dosing apparatus, pumps,sand filters, disinfection
and direct discharge;
3. lagoon Systems consisting only of preliminary treatment, lagoons, pumps, disinfection, necessary chemical treatment for
algae or nutrient control, and direct discharge;
4. tosed-loop Recycle Systems;
5. Groundwater Remediation Systems consisting only of oil/watef separators, pumps, air -stripping, carton adsorption, disk 4eetfon
6. Aquaculture operations with discharge to surface waters;
7. Water Plant sludge handling and back -wash water treatment;
i. Seafood processing consisting of screening and disposal.
j. Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified 4 permitted after July 1,
1993 or if upon inspection by the Division, It Is found that the system Is not being adequately operated or maintained. Such
systems will be notified of the classification or redassification by the Commission, in writing.

(1)
Post Aeration - cascade..............................................................................................................................0
diffused or mechanical. ................................... ............................................................ ...... 2
(m)
Reverse Osmosis............................................................................................................... ....... ................... 5
(n)
Sand or Mixed -Media Fibers - law rate .....--.----......-----.----------------- ---------- ..._.....-....---- --•----_------_-------_-2
highrate......................................................................5
(a)
Treatment processes for removal of metal or cyan€de....................... ............................................................15
(p)
treatment processes for removal of toxic materla€s other than metal or cyanide ......_....__.-..i 5
(7)
SLUDG E
TFIEATM24T _
(a)
Sludge Digestion Tank - Heated (anaerobic)......................................................................_................._....10
Aerobic..............................................................................,...................................................5
Unheated(anaerobic).......................................................................................................
(b)
Sludge Stabilization (chemical or thermal) ..................... .. ....... S
(c)
Sludge Drying Beds - Gravity............................................................................ 2
VacuumAssisled.................. .............................................. ........................................................................
(d)
Sludge Eluirlation ............................................................................. 5 ................. . .. . . .................................
e
Sludge Conciftloner chemical or thermal............ .................. ....... ...»........ ..........:.. ..............................15
(f )
Sludge Thickener (gravity).......................................................................... ..........................................
(9)
Dissolved Air Flotation Unit (not applicable to a unit rated as(3)(1)).............................................................a
(h)
Sludge Gas Utilization (Including gas storage).............................................................................................2
(1)
Sludge Hording Tank - Aerated ................................ _........ ....................................... ........................... ....... 4
Non-aerated............................................................... .......................... ................ .................................... 2
(I)
Sludge Incinerator (not Including activated carbon regeneration)................................................................10
(k)
Vacuum Filter, Centrifuge, or Fhar Press or other similar dewatering devices._— __--_........._......:...............1 0
(8)
RESIDUALS UTIt_1ZATiCIV/DISPOSAL (induddng Incinerated ash)
(a)
Lagoons ................ .........................................................................2
(b)
Land Application (surface and subsurface) (see definition 22a)
by contracting to a Land application operator or landfill operator who holds the land application permit
orlandfiO permit ................................ ............................... ...........................................................................
(c)
Dedicated Landfill(burial) by the perrnittee of the wastewater treatment facility..._................_.._...................5
(9)
DISC-CCTrN
(a)
Chlorination...............................---..................................................................5
(b)
Dochlorination........... _...................... ......................................................... :..............................................
(c)
OZ911e............................. _........-............................................•................_......._........................................-5
(d)
Radiation ............................................ ......................... __....... ............................................................... .5
(1 0)
CHEWCAt_
ADDITION SYSTEM(S) ( see detlnklon No- 9) [not applicable to chemical additions rated as hem (3)(1),
(5)(a)(xi), (G)(a), (6)(b), (7)(1)), (7)(e), (9a), (9)(b) or (9)(c) 5 points each:
Llst.
.......................... ............................. ... ............. .............................................................
...... ...................... ...... .......................................................... I ...... I ................ 5
....................
............. I- ......... -....... ,.-..............................................................................................5
......................................................................................... ..............................5
(1 1)
MlSCE1.ANEO S UNtTSlPROCESSFS
(a)
Holding Ponds, Holding Tanks or Settling Ponds for Organic or Toxic Materials Including wastes from mining
operations containing nitrogen or phosphorus compounds In amounts significarCy greater than Is common
far domestic wastewater............................................................................................................................4
(b)
Effluent Flow Equalization (not applicable to storage basins which are inherent In land application systems).....2
(c)
Stage Discharge (not applicable to storage basins Inherent In land application
(d)
Pumps .............................................. ....................... .................................... ........... ................................. 3
(e)
Stand -By Power Supply.............................................................................................................................3
(f)
Thermal Pollution Control Device........................................................................................._.....................3
TOTAL POINTS ....... ._.........................................................
CLASSIFIC'AT)CN
Classl.................. ............................................................................. ............ 5-25 Points
Classil................................................................................................. ...26-50 points
ClassIN ...................................... .................................................................. 51-66 Points
---------------------------------------------------------
ClassIV .......................................................................................................66-Up Points
Facilities having a rating of one through tour points. Inclusive, do not require a certified operator.
Faciiitlos having an activated sludge process will be assigned a minimum ctassificatlon of Class IL
Facii Iles having treatment processes forthe removal of metal or cyanide will be assigned a minimum ciassifloation of Class 11.
Facilities hav;ng treatment processes for the biological removal of phosphorus will be assigned a minimum cfassfficatlon of Class ill.
DX4 DEFINITIONS
The following definitions shall apply throughout this Subchapter.
(1) Activated Carbon Beds. A physlcallchernical method for reducing soluble organic material from wastewater affluent- The column -type beds used In this
method wiil have a flow rate varying from two to eight gallons per minute per square toot and may be either upltow or downFlow carbon beds. Carbon may or
may not be rug*nerated on 1he wastewater treatment plant site;
(2) Aerated Lagoons. A basin In which all solids are maintained In suspension and by which biological oxidation or organic matter Is reduced through artificially
accelerated transfer of oxygen on a flow -through basis;
(3) Aeration- A process of brfnging about Intimate contact between air or high purity oxygen In a liquid by spraying, aghatlon or dtffuslon;(3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours-
(*) Agricnhuralty managed site. Any site on which a crop Is produced, managed, and harvested (Crop Includes grasses, grains, trees, etc.);
(5) Air Stripping. A process by which the ammonium Ion is first corrvened to dissolved ammonia (pH adjustment) with the ammonia then released to the
atmosphere by physical means; or other similar processes which remove petroleum products such as benzene, toluene, and xylens;
(6) Carbon Regeneration. The regeneration of exhausted carbon by the use of a furnace to provide extremely high temperatures which vcfatlllzs and oxidize the
absorbed Impuritles;
(7) Carbonaceous Stage. A stage of wastewater treatment designed ldachieve 'secondary' effluent dmits;
(8) Centrifuge. A mechanical device In which centrifugal force Is used to saparata solids from liquids or to separate liquids of cwarant denshias;
(9) Chem#cal Addition Systems- The addition of chemkal(s) to wastewater at an application point for purposes of improving solids removal, pH adjustment,
" MIty control, etc-; the capability to experiment with different chemicals and drIterent application points to achieve a specific result will be consldemd one
tam; the capability to add chemica(s) to dual unfis will be rated as one system; capability to add a chemical aI a dillerent applloatfon points for different
tpcses will result In the systems being rated as separate systems;
(10) Chemical Sludge Condtdoning- The addition of a chemical compound such as rime, ferric chloride, or a polymer to wet sludge to coalesce the mass prior to
its application to a dewatering device;
(11) Closed Cycie Systems_ Use of holding pc.Kia or holding tanks for containment of wastewater containing Inorganlr_ nontoxic materfais from sand, gravel,
cashed star* or other similar operatlons. Such systems shall carry a maximum at two points nggardiasa of pumping facifitles or any other appurtenances;
(12) Combined Removal of Carbonaceous 800 and Nilrogunous Removal by Nitrification- A singla stage system required to achieve permit effluent limits on 1300
and ammonia nitrogen within the same biological reactor,
(13) D©chlotinatlan. The partial or complete reduction of residual chlarine In a liquid by any chemical or physical process;
(14) Denilriflcatlon Process_ The conversion of nhrafe-nitrogen to nitrogen gas;

The following scale is used for rating wastewater treatment facilities: (circle appropriate points)
REM POINTS
(1)
Industrial Pretreatment Units or Industrial Pretreatment Program (see definition No. 33)...................................................4
(2)
DESIGN FLOW OF PLANT IN gpd [not applicable to non-contarrinatad Cooling waters, sludge handling facilities for
water purification
plants, totally dosed cycle systems(sea definition No. 11), and facilities consisting only of Item
(4)(d) or Items (4)(d) and (I1)(d))
0 - 20,000..... ... »...............................................................................•--..--.._....._...........•-_..........._._.......1
20.001 - 50,000........................... ..................... „................... _............................................................... 2
50,001 - 100,000...................... ....................................................... ........................................ ............. 3
100,001 - 250.000................................ ...................................................................._..».......................A
250.001 - 500,000............................ »............................................. ....... ............ ............._._.._.......__.......5
.. 500.001 - 1,000.QOD....,......................................................................................................„..............t3
1,000,001 - 2.000.000............................................................................................................................10
2.D00.001 (and up) rate t point additional for each 200,000 gpd capacity up to a maximum of ............30
Design Flow (gpd)
(3)
PRELIMINARY UNiTSIPROCESSES (see detinftlan No.32)
(a)
i3arScreens...................................... .........................................................................................................1
or
(b)
Mechanical Screens, Statle Screens or Comminuting Dsv€ces................................. ...._._._._.._.......2
(c)
Grit Removal ............ _................................................................................................................................1
or -
(d)
Mechankal or Aerated Grit Removal.............................................................................................................2
(a)
Flow Measuring Device ................. ............... ......................................................................... ..................... 1
or
(f}
Instrumented Flaw Measurement................................................................................................................2
(g)
Preaeration........»................. ..... ..............................................................................................................
(h)
Influent Flow Equalization ............. ................................................................ _................................ _......... 2
(1)
Grease or Oil Separators - ......... ......... ....................... 2
Mechanical.......,........................................................................ ............................................................... A
Dissolved Air Flotation..................................................................................................................._...........a
{)}
Prechlorinatlon.......................... ............... ...................................................... ...... ...................................
(4)
PRiMARYTREATMENTLNi &PROCESSES
(a)
Saptle Tank (see definition No. 43).................... ........................ .............. —.............................................. 2
(b)
Imhoff Tank...„.....».» ....................................... ........................................... ............................... ........... .5
(c)
Primary Clarifiers ............................................ .....5
(d)
Setlling Ponds or Settling Tanks for inorganic Nontoxic Materials (sludge handling facilities for water
purif"tlon plants, sand, gravel, stone, and other mining operations except recreational activities such as gem
orgold mining) ....... _................................................. ................................ .............................................. 2
(5)
SECONDARY TREA7MENTLNIiS ROCESSES
(a)
Carbonaceous Stage
(l} Aeratlon-Mgh Purity Oxygen System .......... ............ -.......... —.»...... -.......... _................... 2D
OiffusedAir System .............. ........................................... ...... ...................................... 10
Mechanical Air System (fixed, floating at rotor}„..._..._...«.. ».«..._.._ ......„......„.-......�
Separate Sludge Rsaeration...................................................................... .............-........3
(ff) Trldding Filter
HighRate ........ ......................... .....................„............................................._............._.7
StandardRate ....... ........ ..................... ...... ..................................................................
PackedTower..............................•.........................-_..._.._.-_._..........__...............................5
(lil) Biological Aerated Fitter or Aerated Biological Filter ---------- ..----..„.__._„„.. --------_-1 0
(1v) Aerated Lagoons................................................................».............._....._.._._..__..........10
(V) Rotating Biological Contactors .................................... _.....__._.__».....__....._....................10
(vi) Sand Filters -Intermittent biologlcal.................................................................................2
Recirculating biological....»..„..« ........................ ................. .......................................... A
(vl€] Stabilizatlon Lagoons ........... ,.»........................................ ........................................... 5
(V IiI) CLvfrSef.................. ..... ..................... .. ..................... .5
(lx) Single stage system for combined carbonaceous removal of BOO and nitrogenous removal by
nitril)callon (see definition No. 12)(Faints for this item have to be in addition to items
(5)(a)(1) through (5)(a)(01),
utlitzing the extended aeration process (see definition No.3a).._.......................................2
utlllzing other than the extended aeration process.....................................__....._.......«...a
(x ) Nutrient additions to enhance BOO removal......« ................... .„........................................ 5
(x1) Biological Culture (-Super Bugs )addition ............................. -»....................................... 5
(b)
Nitrogenous Stage
(1) Aeration - High Purity Oxygen System__...._..._...._..______...........................................20
oiifusedAir System ............. -.............................................. .......................................... 10
Mechanical Air System (fixed, floating or rotor) ...„..._» .,......„...»......_..._...__..._.5
Separate Sludge Rsaermfon...................................... .»....._........................................
(II) Trickling Fllter-High Rate ............................ ..................................... _................................ 7
Standard Rate .................. ....................................................... ...................................
PackedTower ............... .....„»..._..................._.......»..„..„..»-......«...............................5
(ill) Biological Aerated Finer or Aerated Blotogical Finer ........ „ ._ ..---- -----------------10
(IV) Rotating Blofogfcal Contaclem........................................... -.,.._•....._...........................10
(v) Sand Finer - Intermittent b€ 4ogfcat...... ............... ........... .._._„......„._.......»_.._..... .........
Recirculating biological ................................... ..._........••......•••-•......................................3
(VI) Ctarfier............................... ...... ........... .................. ...................... ............................
(6)
TERTWRYORAOVANCEDTREATMENTLNrr51PROCESSES
(a)
Activated Carbon Beds -
without carbon regeneration ...... .».......................... ..... ..... ........... .—.................. .....................
withcarbon regeneratIon.............. _..... - .......... _...... ....... .......... ........... ... ........ ............. ...... 15
(b)
Powdered or Granular ActWlad Carbon Fead-
without carbon regeneration ......... .... ..................... ..».......... ..... »...„.... ,............. _................
withcarbon regeneration .......... „....... .»..» ......... ................... ...._.. ....„........».__.._.15
(c)
Air stripping ...... .....».»......................................... ._............................. ..... ..... ........................................
(d)
Denitriflcatlan Process ........ ........... ........ ..................... ........ ___ .-.......... _.... .................... 10
(a)
Elettmdlalysis..... ....... .... .. ..... _ _.... _ .....„.. ..—. �..„.... �. .„_....„.....:.5
(f )
Foam Separation ............... .......... ..».......... .............................. ..... ............................5
(g)
ton Exchange .. ......... .............. »........... ..._.... .,...... .»... ........ .,... ..............
(h)
Land Applicatlon of Treated Effluart (see definition No- 22b) (not applicable for sand. gravel, stone
and other similar mining operations) by high rate ...........4
(f)
Microscreens........ .. ....... „._. ......__»........... ................ ....... ._....._................... �._�....» 5
(1)
Phosphorous Removal by Blological Processes (See definition No. 26) ....... - ........ „........„»„..._ 20
(k)
Polishing Ponds - without aeratlart............ ..... ............ - ...- ..2
with aeration....— . ....... . .. �_ ». ._..__. ......5