WQ0005524_Final Permit_19960523

date of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
May 23, 1996
Mr. Thomas G. Beckingham
General Electric Company
P.O. Box 780 M/C G-50
Wilmington, NC 28402
Dear Mr. Becldngham:
LT.RMAI
[DEHNFi
Subject: Permit No. WQ0005524
General Electric Company
Castle Hayne Facility
Groundwater Remediation Facilities
New Hanover County
In accordance with your renewal request received February 7, 1996, we are forwarding herewith
Permit No. WQ0005524, dated May 23, 1996, to General Electric Company for the continued operation
of the subject groundwater remediation facility.
This permit shall be effective from the date of issuance until April 30, 2001, shall void Permit No.
WQ0005524 issued December 20, 1993, 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. David Goodrich in the Groundwater Section at [phone]. If you
need any additional information concerning this matter, please contact T� Ray :Coxgat [phone],
extension 549.
Sincerely,
A. Presto oward, Jr., P.E.
cc: New Hanover County Health Department
Wilmington Regional Office, Water Quality Section
Wilmington Regional Office, Groundwater Section
Bob Cheek, Groundwater Section, Central Office
Training and Certification Unit
Facilities Assessment Unit
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
RALEIGH
GROUNDWATER RETMEDIATION 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
General Electric Company
New Hanover County
FOR THE
continued operation of a 175 GPD groundwater remediation facility consisting of a four -inch diameter
recovery well and pump, a 50 gallon surge tank, dual 200 pound activated carbon canisters in series, and
an infiltration trench measuring 7 feet wide by 15 feet long by 5 feet deep, to serve General Electric
Company's Castle Hayne Facility, with no discharge of wastes to the surface waters, pursuant to the
renewal request received February 7, 1996, and in conformity with the project plan, specifications, and
other supporting data subsequently filed and approved by the Department of Environment, Health and
Natural Resources and considered a part of this permit.
This permit shall be effective from the date of issuance until April 30, 2001, shall void Permit No.
WQ0005524 issued December 20, 1993, and shall be subject to the following specified conditions and
limitations:
I. PERFORMANCE STANDARDS
1. 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.
2. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall tame immediate corrective action, including those
actions that may be required by this Division, such as the construction of additional or
replacement treatment or disposal facilities.
3. 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.
4. 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 North Carolina Division of
Environmental Management.
5. Diversion or bypassing of the untreated groundwater from the treatment facilities is
prohibited.
2

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 Certification Commission, 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 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 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 Title 15A, Chapter 8A, .0202.
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
Any additional monitoring deemed necessary by the Division of Environmental
Management 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 Wilmington Regional Office, telephone
number [phone], 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 wastewater treatment facility which results in the treatment of
significant amounts of wastes 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;
b. Any process unit failure, due to known or unknown reasons, that renders 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
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 facility is not in compliance
with its permit limitations.
Persons reporting such occurrences by telephone shall also file a written report in letter
form within five (5) 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
Monitoring wells UI-1A, U1-5A and U1-3A shall be sampled semiannually in March and
September for EPA methods 602 and 610. Results of the sampling should be forwarded to
the N.C. Division of Environmental Management on Form GW-59 (Compliance and
Monitoring Report Form) every April and October.

2. All components of the groundwater recovery, treatment and disposal system shall be
properly weather -proofed to prevent freezing and failure of the system.
3. The effluent from the treatment system shall be sampled quarterly for EPA Methods 602
and 610. The effluent shall be sampled at a point prior to discharge to the infiltration
gallery. The results of the sampling and analysis shall be sent to the Groundwater Section
in the Wilmington Regional Office within 30 days of sample collection.
4. The groundwater recovery treatmeni and disposal system shall be inspected weekly. If it is
determined that the system is malfunctioning, all repairs should be made as soon as
possible and reported to the Wilmington Regional Office.
5. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall
be provided.
6. 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.
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 of Environmental Management or other permitting authority, upon request.
3. Any duly authorized officer, employee, or representative of the Division of Environmental
Management 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 of Environmental Management accompanied by an application
fee, documentation from the parties involved, and other supporting materials as may be
appropriate. This request will be considered on its merits and may or may not be
approved. Any potential new owner of the subject property shall be notified of the details
of the contamination and remediation of the site.
5. 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
Permttee to an enforcement action by the Division of Environmental Management in
accordance with North Carolina General Statute 143-215.6(a) to 143-215.6(c).
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.
10. The permittee shall obtain a well construction permit from the Wilmington Regional Office
prior to construction of any additional recovery wells.
Permit issued this the twenty-third day of May, 1996
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
�40 AaQ�/L
A. Preston oward, Jr., P. ., Director
Division of vironrnental Management
By Authority of the Environmental Management Commission
Permit Number WQ0005524

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a
RATING SCALE FOR CLASSIFICATION
OF WATER POLLUTION CONTROL SYSTEMS
i Name of Facility:
Owner or Contac erson:
Mailing Address:
County: ,NA:�,Lj ,.In !tt&
Telephone:
Present Classification:
New Facility
Existing Facility
NPDES Per. No. NCOO Nondisc.
Per. No.WQ �5
Health Dept.Per No.
Rated by: _r r
Telephone:
Date:
Reviewed by:
Health Dept.
Telephone:
Regional Office
Telephone:
Central Office
Telephone:
ORC:
Grade:
Telephone:
Check Classificaticn(s): Subsurface
Spray Irrigation
Land Application
Wastewater Classification: (Circle One) 0
-------------------------------------------------------------
It III IV
Total Points:
Ii►I&IrMI I zi alb : \ I : : 1 i Q11 � , i[si �►1 a!a *� : A►IRM-11 _ :1 �, ► i .il: S:l�i� . Ida � �
r�j� � .i � :4� 1. la _ : lu gal a�i 1■ r,. i aim :. �� � min
i..: lid\ �. � Ji'. :.,\.• �. I��e. ��\ .71►. �►. �i al., :\•
L.i � . �: 1\ ►Ili : 1:� � � : � y �s J i'r•Ru : t i._ : �'►
SUBSURFACE CLASSIFICATION
(check all units that apply)
1. septic tanks
2. pump tanks
3. siphon or pump -dosing systems
4. sand filters
5. grease trapfinterceplor
6. oil/water separators
7_ gravity subsurface treatment and disposal:
8. pressure subsurface treatment and disposal:
SPRAY IRRIGATION CLASSIFICATION
(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 trapliinterceptor
8.
oiUwater separators
9.
disinfection
10.
chemical addition for nutrientlafgae control
11.
spray irrigation of wastewater
In addition to the above ciassifleations, 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 APPLiCATIONIRESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of biosolids, residuals or contaminated soils on a designated site.
WASTEWATER TREATMEI TFACILITYCtASSIFICAT)ON
The following systems shall be assigned a Class I classification, galeaa 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 if Appropriate)
1. Oil/wafer Separator Systems consisting only of physical separation, pumps and disposal;
2. Septic Tank/Sand Filter Systems consisting only of septic 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. Ciosed-loop Recycle Systems;
5._f-'Groundwater Remediation Systems consisting only of oil/water separators, pumps, air -stripping, carbon adsorplion, disinfection
and dispoFzJ- ;
6. Aquacuiture operations with discharge to surface waters;
7. Water Plant sludge handling and back -wash water treatment;
8. Seafood processing consisting of screening and disposal.
9- Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified if 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 reclassification by the Commission, in writing.

The following scale is used for rating wastewater treatment facilities: (circle appropriate points)
ITEM POINTS
(1) IndusWal Pretreatment Units or Industrial Pretreatment Program (see definition No. 33)................
(2) DESIGN
FLOW OF PLANT IN gpd [not applicable to non -contaminated cooling waters, sludge handling facilities for
water purification plants, totally dosed cycle systems(sae definition No. 11), and facilities consisting only of item
(4)(d)
or Items (4)(d) and (11)(d))
0 - 20,000................................................................................................................................................1
20,001 - 50,000......................................................... ...2
50,001 - 100.000....................................................................................................................................a
100.001 - 250,000..................................................................................................................................A
250,001 - 500,000..................................................................................................................................5
500,001 1,000,000...............................................................................................................................8
1.000,001 - 2,000,000...........................................................................................................................10
2.000,001 (and up) rate i point additional for each 200.000 gpd capacity up to a maximum of .................30
Design Flow (gpd)
(3) PRELIMINARY UNITSIPROCESSES (see definition No.32)
(a)
Bar Screens.........................................................................._....................................................................1
(b)
or
Mechanical Screens, Static Screens or Comminuting Devices..........................................................................2
(c)
Get Removal................................................................................................................................ ...........1
or
(d)
Mechanical or Aerated Grit Removal.............................................................................................................2
(a)
Flow WasurkV Device................................................................................................................................1
or
(f )
instrumented Flow Measurement ............................................. .................................................................. 2
(g)
Preaeratlon............................................................................................................................................... 2
(h)
influent Flow Equalization..........................................................................................................................2
(i)
Grease or Oil Separators - Gravity.................................................................................................................2
Mechanical...............................................................................................................................................3
Dissolved Alr Flotation .............................................................................................................................-A
()}
Prechlodnatlon..........................................................................................................................................5
(4) PRmARYTRFATMENTijfrrs/Pi66iSSF.S
(a)
Septic Tank (see definition No. 43).... -......................................................------..........................................2
(b)
Imhoff Tank. ......................................................................................................................................... . .. 5
(c)
Primary Clariliers.........................................................................................................................................5
(d)
Settling Ponds or Settling Tanks for Inorganic Norrloxic Materials (sludge handling facilities for water
purification plants, sand, gravel, stone, and other mining operations except recreational activities such as gem
or gold ................................................................................................................2
5 SECONDARYTRFA TMEin nll.iSrPA�CESsi�
( )
(a)
Carbonaceous Stage
{f) Aeration -High Purity Oxygen System......................„.......................................................20
DiffusedAir System.......................................................................................................10
Mechanical Air System (fixed, floating or rotor)„................................................................8
SeparateSludge Reasratlon............................................................................................3
{li) Tddding Filter
HighRate......................................................................................................................7
StandardRate...............................................................................................................5
PackedTower.................................................................................................................5
Biological Aerated Filter or Aerated Biological Filler ............ ........................ „......... _..._.„...1 0
(iv) AeratedLagoons ..........................................................................................................10
(v) Rotating Biological Contactors......................................................................................10
(vi) Sand Filters -intermittent biological..................................................................................2
Recirculatingbiological....................................................................................................3
(vil) Stabilization Lagoons....................................................................................................5
(vili) ClarltSar...........................................................................................................................5
(ix) Single stage system for combined carbonaceous removal of BOD and nitrogenous removal by
nitrification (see definition No. 12)(Points for this hem have to be in addition to items
(5)(a)(i) through (5)(a)(viil).
utifting the extended aeration process (see definition No.3a)..........................................2
utilizing other than the extended aeration process............................................................a
(x ) Nutrient additions to enhance BOD removal......................................................................5
(xi) Biological Culture ('Super Bugs')addition........................................................................5
(b)
Nitrogenous Stage
(I) Aeration - High Purity Oxygen System.............................................................................20
DitfusedAir System.......................................................................................................1 0
Mechanical Air System (fixed. floating or roior)................. 1—.......................... .................. 8
Separate Sludge Reaerallon.............................................................................................3
(Il) Trickling F[er-High Rate...................................................................................................7
Standard Rate...............................................................................................................5
PackedTower................................................................................................................6
[ill} Biological Aerated Filler or Aerated Biological Filter.............................................................1 o
(Iv) Rotating Biological Conlactors......................................................................................10
(v) Sand Fiiter - Intermittent bkhogicaf..................................................................................2
Recirculating bioiogical....................................................................................................2
(vi) clarifier..........................................................................................................................4
(6) TERTARYORADVANCEDTREATMENTLNl7WFiOCESSES
(a)
Activated Carbon Beds -
withoutcarbon regeneration...................................................................................................4
withcarbon regeneration.......................................................................................................15
(b)
Powdered or Granular Activated Carbon Food -
without carbon regeneration..................................................................................................5
:with carbon regeneration.....................................................................................................1 5
(c)
Air stripping.............................................................................................................................................5
(d)
Denttrification Process..............................................................................................................................1 0
(0)
Electrodfalysis.............................................................................................................................................5
(1)
Foam Separation.......................................................................................................................................5
(9)
Ion Exchange.............................................................................................................................................5
(h)
Land Application of Treated Effluent (see detinklon No. 22b) (not applicable for sand, gravel, stone
and other similar mining operations) by high rate Infiltration ................. _.................. ................................. A
(1)
Microscreens.............................................................................................................................................6
(1)
Phosphorous Removal by Sloiog[cal Processes (See definition No. 281 .........................................................20
(k)
Polishing Ponds - without aeration...........................................................................................................2
withaeration.................................................................................................................5

- (I)
Post Aeration - cascade..............................................................................................................................0
diffusedor mechanical.....................................................................................I..................2
(m)
Reverse Osmosis........................................................................................................................................5
(n)
Sand or Mixed -Media Filters - low rate..........................................................................................................2
highrate......................................................................5
(o)
Treatment processes for removal of metal or cyanide...................................................................................16
(p)
treatment processes for removal of toxic materials other than metal or cyanide..............................................15
(7) SLUMETREATMENT
(a)
Sludge Digestion Tank - heated (anaerobic)...............................................................................................10
Aerobic..............................................................................................................................................5
Unheated (anaerobic)..............................................................................................................................3
.
(b)
Sludge Stabilization (chemical or thermal) .............................
(c)
Sludge Drying Bads - Gravity......................................................................................................................2
VacuumAssisted......................................................................................................................................5
(d)
Sludge Eluldation.....................................................................................................................................5
(0)
Sludge Conditioner (chemical or thermal)..................................................................................... ..........5
(f )
Sludge Thickener (gravity)..........................................................................................................................5
(g)
Dissolved Air Flotation Unit [not applicable to a unit rated as(3)(i)].............................................................6
(h)
Sludge Gas Utilization (including gas storage).............................................................................................2
(1)
Sludge Holding Tank - Aerated....................................................................................................................5
Non-aerated.......................................................... ...................................................................................2
(J)
Sludge Incinerator (not Including activated carbon regeneration)................................................................10
(k)
Vacuum Filter, Centrifuge, or Filter Press or other similar dewatering devices.. ................................................. 10
(8) RESIDUALS L)TILIZATIONJDtSPOSAL (including 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 folds the land application permit
orlandfill permit........................................................................................................................................2
(c)
Dedicated Landfill(budal) by the permittee of the wastewater treatment facility..............................................5
(9) 1>lSINF:Ecnav
(a)
Chlorination.............................................................................................................................................5
(b)
Dechlorination..........................................................................................................................................S
(c)
Ozone... ...................................................................................................................................................5
(d)
Radiation.................................................................................................................................
(t 0) CHEMICAL ADDITION SYSTEM(S) ( see definition No. 9) (not applicable to chemlcal additions rated as hem (3)(f).
(5)(a)(xi).
(6)(a), (6)(b), (7)(b). (7)(e). (9a), (9)(b) or (9)(c) 5 points each;
List.................................................................
...................................................................................................................................5
.........................................................................................................I......I..................5
................ ............................................................................................................5
(11) MISCELLANEOUS UNf WADCESSES
(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 significantly greater than Is common
fordomestic wastewater...........................................................................................................................A
(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 systems)..................................5
(d)
Pumps.....................................................................................................................................................3
(e)
Stand -By Power Supply............................................................................................................................3
(f)
Thermal Pollution ControlDevice ................................................................................................................3
TOTAL POINTS..........................................................................
CLASSIFiCAWN
ClassI...........................................................................................................5-25 Points
Class11.........................................................................................................26-50 Points
ClassllI........................................................................................................51-65 Points
ClassIV... ............................... .................. ................................................. 66-Up Points
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Facilities having a rating of one through four points, Inclusive, do not require a certified operator.
Facilities having an activated sludge process will be assigned a minimum classification of Class It.
Facilities having treatment processes for the removal of metal or cyanide will be assigned a minimum classification of Class 11.
Facilities having treatment processes for the biological removal of phosphorus will be assigned a minimum classrrication of Class III.
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.0oD4 DEFINITIONS
The following definitions shall apply throughout this Subchapter.
(1) Activated Carbon Beds. A physicallchemical method for reducing. soluble organic material from wastewater effluent; The column -type beds used In this
method will have a flow rate varying from two to eight gallons per minute per square foot and may be either upflow or downflow carbon beds. Carbon may or
may not be regenerated on the 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 artificlaliy
accelerated transfer of oxygen on a flow -through basis;
(3) Aeration. A process of bringing about Intimate contact between air or high purity oxygen In a liquid by spraying, agitation or diffuslon;(3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours.
(4) Agriculturally managed site. Any site on which a crop is produced, managed, and harvested (Crop includes grasses, gralns, trees, etc.);
(5) Air Stripping. A process by which the ammonium Ion is first converted 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 xylene;
(6) Carbon Regeneration. The regeneration of exhausted carbon by the use of a furnace to provide extremely high temperatures which volatilize and oxidize the
absorbed Impuritles;
(7) Carbonaceous Stage. A stage of wastewater treatment designed to achieve "secondary" effluent Ilmfts;
(8) Centrifuge. A mechanical device In which centrifugat force Is used to separate solids from liquids or to separate liquids of different dens'rlas;
(9) Chemical Addition Systems- The addition of chemicals) to wastewater at an applicatlon point for purposes of improving solids removal, pH adjustment,
alkalinity control, etc.; the capability to experlment with different chemicals and different appllcatlon points to achieve a specific result will be considered one
system; the capability to add chemical(s) to dual units will be rated as one system; capability to add a chemical at a different application points for different
purposes will result In the systems being rated as separate systems;
(10) Chemical Sludge Conditioning. The addition of a chemical compound such as ilme, ferric chloride, or a polymer to wet sludge to coalesce the mass prior to
its application to a dewatering device;
(11) Closed Cycle Systems. Use of holding ponds or holding tanks for containment of wastewater containing Inorganic, non -toxic materials from sand, gravel.
crushed stone or other similar operations. Such systems shall carry a maximum of two points regardless of pumping facilities or any other appurtenances;
(12) Combined Removal of Carbonaceous BOD and Nitrogenous Removal by Nitrification- A single stage system required to achieve permit offluert limits on SOD
and ammonia nitrogen within the same blologlcai reactor,
(13) Dechlorinatlon. The partial or complete reduction of residual chlorine in a liquid by any chemical or physical process;
(14) Denitrillcation Process. The conversion of nitrate -nitrogen to nitrogen gas;

(15) Electrodialysis. Process for removing Ionized salts from water through the use of Ion -selective ion -exchange membranes;
(16) Flier Press, A process operated mechanically for partially dewatering sludge;
(17) Foam Separation. The planned frothing of wastewater ar wastewater effluent as a means of removing excessive amounts of detergent materials through
the introduction of air In the form of fine bubbles; also called foam fractionation;
(10) Grit Removal. The process of removing grk and olher Navy mineral matter from wastewater:
(19) Imhoff Tank. A deep two story wastewater tank consisting of an upper sedimentation chamber and a lower sludge digestlon chamber.
(20) Instrumented Flaw Measurement. A device which Indicates and records rate of flaw;
(21) ion Exchange. A chemical process in which ions from two different molecules are exchanged;
(22) Land application:
(a) Sludge Disposal. A final sludge disposal method by which wet sludge may be applied to land either by spraying on the surface or by subsurface injection
(i.e.. chisel plow); [not appitCable for types of sludge described In (11) of this Rule];
(b) Treated Eifluerd. The process of spraying treated wastewater onto a land area or other methods of application of wastewater onto a land aroa as a
means of final disposal or tneatment;
(23) Microscrsen. A low speed, continuously back -washed, rotating drum fitter operating under gravity condlt€ons as a polishing method for removing
suspended solids from effluent;
(24) Nitrification Process. The biochemical conversion of unox€dized nitrogen (ammonia and organic nitrogen) to oxidized nitrogen (usually nitrate);
(25) Nitrogenous Stage. A separate stage of wastewater treatment designed for the specific purpose of converting ammonia nitrogen to nitrate nitrogen;
(26) Phosphate Removal, Biological. The removal of phosphorus from wastewater by an oxiclanoxic process designed to enhance luxury uptake of phosphorus
by the microorganisms;
(27) Pollshing Pond. A holding pond following secondary treatment with sufficient detention time to allow seating of finely suspended solids;
(26) Post Aeration. Aeration following conventional secondary treatment units to Increase effluent D.O. or for any other purpose;
(29) Post Aeration, (Cascade) A polishing method by which dissolved oxygen Is added to the effluent by a nonmechan€cat, gravity means of flowing down a
series of steps m weirs; The flow occurring across the slaps or weirs moves in a fairly thin layer and the operation of the cascade requires no operator
adjusiment; thus, zero points are assigned even though this Is an essential step to meeting the limits of the discharge permit,
(30) Powdered to Granular Activated Cartoon Feed. A biophysical carboys process that utilizes biological aatfvity and organic absorption by using powdered or
granular activated carbon; Virgin or regenerated carbon Is feed controflad Into the system;
(31) Preaerallon. A tank constructed to provide aeration prior to primary treatment;
(32) Preliminary Units. Unit operations In the treatment process, such as screening and comminution, that prepare the liquor for subsequent major operations;
(33) Industrial Pretreatment.
(a) Pre-treatment Unit, Industrial. The conditioning of a waste at its source before discharge, to remove or to neutralize substances Injurious to sewers and
treatment processes or to eftact a partial reduction in load on the treatment process which is operated by the same governing body as the wastewater
treatment plant being rated;
b) Pre-treatment Program, Industrial - must be a State or EPA required program to receive points on the rating sheet;
(34) Primary Clarifiers. The first settling tanks through which wastewater Is passed In a treatmartt works for the purpose of removing settleable and suspended
solids and BOD which Is associated with the solids;
(35) Pumps, All influent, effluent and in -plant pumps;
(36) Radiation. Disinfection or sterilization process utilizing devices emftting ultraviolet or gamma rays;
(37) Reverse Osmosis. A treatment process In which a heavy contaminated liquid Is pressurized through a membrane forming nearly pure liquid free from
suspended solids;
(38) Rotating Biological Contractors. A fixed b€olog€cai growth process In which wastewater flows through tanks In which a series of partially submerged circular
surfaces are rotated;
(39) Sand Titers:
(a) Intermittent Biological. Filtration of effluent following septic tanks, lagoons, or some other treatment process in which further blodaeompositlon is
expected to produce desired effluents; Hydraulic loading rates on these filters are computed In gpdrac and have a resulting low gpmisf (less than one);
b) Recirculating biological - the same type of sand filter as defined In Subparagraph (39) (a) of this Rule with the added Capability to recycle effluent back
through the sand filter;
(40) Sand or Mfxed-Madla Filters. A polishing process by which affluent limits are achieved through a further reduction of suspended solids;
(a) low rate — gravity, hydraullcally loaded filter with loading rates In the one to three gpmtsl range;
(b) high rate — a pressure, hydraulically loaded fitter with loading rates in the five gpmisf range; At arry rate, the baling rate will exceed three gprrdsf;
(41) Secondary Clarifiers. A tank which follows the biological unit of treatment plant and which has the purpose of removing studges associated with the
biological treatment units;
(42) Separate Sludge Reaerailon. A part of the contact stabilization process where the activated sludge Is transferred to a tank and aerated before returning It
to the contact basin;
(43) Septic Tank. A single -story settling tank In which settled sludge Is In contact with the wastewater flowing through the tank; shall riot be applicable for
Septic tank systems serving single family residences having capacity of 2,000 gallons or less which discharge to a nitrification field;
(44) Sludge Digestion. The process by which organic or volatile matter and sludge is gasifled, liquefied, mineralized or converted into more stable organic matter
through the activity of living organisms, which Includes aerated holding tanks;
(45) Sludge Drying Beds. An area comprising natural or artificial layers of porous materials upon which digested sewage sludge is dried by drainage and
evaporation;
(46) Sludge Elutriallon. A process of sludge conditioning in which certain constituents are removed by successive washings with fresh water or plant effluent:
(47) Sludge Gas Utllizal#on, The process of using sewage gas for the purpose of heating bullrings, driving ertgiries, etc.;
(48) Sludge Holding Tank (Aerated and Nonaerated). A tank utilized for small wastewater treatment plants not conialning a digester In which sludge may be
kept fresh, and supernatant withdrawn prior to a drying method (i.e. sludge drying beds): This may be done by adding a small amount of air simply to keep the
sludge fresh, but not necessarily an amount that would be required to achieve stab'rllzatlon of organic matter. A nonaerated tank would simply be used 10
decant sludge prior to dewatering and would not allow long periods (several days of detention) without resulting odor problems;
(49) Sludge Incinerators. A furnace designed to bum sludge and to remove alf moisture and combustible materials and reduce the sludge to a sterile ash;
(50) Sludge Stabilization (Chemical or Thermal). A process to make treated sludge less odorous and putrescrble, and to reduce the pathogenic organism
content; This may be done by pH adjustment, chlorine dosing, or by heat treatment;
(51) Sludge Thickener. A type of sedimentation tank In which the sludge Is permitted to settle and thicken through agitation and gravity-,
(52) Stabilization Lagcon. A type of oxidation lagoon in which biological oxidation of organic matter is effected by natural transfer of oxygen to the Water from.
air (not a polishing pond);
(53) Stand -By Power Supply. On site or portable electrical generating equipment;
(54) Static Screens. A stationary screen designed to remove solids, including non -biodegradable particulate (fioatable solids, suspended solids and BOD
reduction) from municipal and industrial wastewater treatment systems;
(55) Tertiary Treatment. A stage of treatment following secondary which is primarily for the purpose of effluent polishing; A settling lagoon or sand or coal fitii&
might be employed for this purpose;
(56) Thermal Pollution Control Device, A device providing for the transfer of heat from a fluid flowing In tubes to another fluid outside the tubes, or vice versa:
or other means of regulating liquid temperatures;
(57) Thermal Sludge Conditioner. A conditioning process by which heat Is added for a protracted period of tlme to improve the dewaterablllty of sludge by the
solub€Iizing and hydrauiizing of the smaller and more highly hydrated sludge particles;
(58) Toxic Materials. Those wastes or combinations of wastes, including dlseasa-causing agerns which attar discharge and upon exposure, Ingestion, inhalation
or assimilation into any organism, either directly from the environment or indirectly by ingestion through food Chains, will cause death, disease, behavioral!
abnormalities, cancer, genetic mutatlons, physiological malfunctions (including malfunctions In reproduction) or physical deformations, in such organisms or their
offspring; Toxk materials Include, by way of Ifiustratlon and not 4mitatlon: lead, cadmium, chromium, mercury, vanadlum, arsenic, zinc, ortho-nitro-chlorobenzens
(ONCE), polychlorinated biphenyls (PCBs) and d#chiorodiphenyl trichloroethane (DDT); and any other materials that have or may hereafter be determined to have
toxic properties;
(59) Trickling Filler. A biological treatment unit consisting of a material such as broken stone or rock over which wastewater is distributed; A high rate trickling
filter is one which operated at between 10 and 30 rngd per acre. A low rate trickling filter is one which is designed to operate at one to four mgd per acre;
(60) Trickling Filter (Packed Tower). A plug flow type of operation In which wastewater flows down through successive layers of media or filtrate material; Organic
materfaf Is removed continually by the active bloiogical fired growth In each successive Layer. This method may produce 'secondary' quality effluent, or may be
adapted to produce a Ntrlfled effluent;
(61) Vacuum Filter, Centrifuges, or Filter presses- Devices which are designed to remove excess water from either digested or undigested sludge prior to disposal
or further treatment.