WQ0003360_Final Permit_19950713

State 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
July 13, 1995
Mr. lames D. Sutton
S & W Ready Mix Concrete Company, Inc.
Post Office Box 872
Clinton, North Carolina 28328
&I T M T
14
EDEHNF1
Subject: Permit No. WQ0003360
S & W Ready Mix Concrete Co. Inc.
Monroe Street Plant, P-6
Wastewater Recycle System
New Hanover County
Dear Mr. Sutton:
In accordance with your application received March 6, 1995, we are forwarding herewith Permit
No. WQ0003360 dated July 13, 1995, to S & W Ready Mix Concrete Company, Inc. for the construction
and operation of the subject wastewater recycle system. It is understood the subject recycle system has
been relocated, along with the plant facilities, to a different part of the property. It is confirmed by the
Division's Regional Office the subject facilities are the same as before, and that additional piping has been
extended for recycling wastewater at the batch mixing area. Please note that allowing any overflow from
this permitted recycle system into the stormwater pond is prohibited by the conditions of this permit and
would be a violation if allowed to occur. Please note the facility relocation requires a certification be
provided to the Division that the subject facilities are the same as at the initially permitted location.
This permit shall be effective from the date of issuance until May 31, 2000, shall void Permit No.
WQ0003360 issued June 27, 1990, 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 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.
One set of approved plans and specifications is being forwarded to you. If you need additional
information concerning this matter, please contact Mr. John Seymour at [phone] ext. 546.
Sincerely,
A, Prest©p Howard, Jr., P.E.
cc: New Hanover County Health Department
Wilmington Regional Office, Water Quality Section
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
RECYCLE SYSTEM 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
S & W Ready Mix Concrete Company, Inc.
New Hanover County
FOR THE
construction and operation of a new/relocated 2,967 GPD wastewater recycle system consisting of three
cement lined retention/settling basins, a catch basin with drain piping to the settling basins, a pump station
with dual 0.4 Hp pumps and 2 inch force main, a dust control spray system, and all associated piping,
valves, controls and appurtenances to serve S & W Ready Mix Concrete Company Inc. to recycle
wastewater for aggregate pile moisture control and augmentation water for batch operations, with no
discharge of wastes to the surface waters, pursuant to the application received March 6, 1995, 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 May 31, 2000, shall void Permit No.
WQ0003360 issued June 27, 1990, and shall be subject to the following specified conditions and
limitations:
1. 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.
2. This permit is effective only with respect to the nature and volume of wastes described in
the application and other supporting data.
3. The facilities shall be properly maintained and operated at all times.
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. The approval of the request will be considered on its merits and may or may
not be approved.
5. 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. Mail the Certification to the Water Quality
Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC 27626-0535.
6. 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 this Division, such as the construction of additional or
replacement treatment or disposal facilities.

7 . The Wilmington Regional Office, telephone number 910/ 395-3900 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.
8. The 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.
9. 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.
10. 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.
11. Diversion or bypassing of untreated wastewater from the treatment facilities is prohibited.
12. Freeboard in the settling basins shall not be less than one foot at any time.
13. Any 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.
14, Adequate inspection, maintenance, and cleaning shall be provided by the Permittee to
insure proper operation of the subject facilities.
15. The Permittee or his designee shall inspect the wastewater recycle 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.
16. 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 recycle system 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.
17. 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).
18. Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee 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).
19. 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.
20. A set of plans and specifications for the subject project must be retained by the Permittee
for the life of this project.
2

21. Noncompliance Notification:
The Permittee shall report by telephone to the Wilmington Regional Office, telephone
number 910/ 395-3900 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 15 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.
22. 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 H, 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.
23. 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 13th day of July, 1995
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
A. Preston I4oward, Jr., P.E., Director /
Division of Environmental Management
By Authority of the Environmental Management Commission
Permit Number WQ0003360

Permit No. WQ0003360
July 13, 1995
ENGINEER'S CERTIFICATION
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
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.

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RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility:
Owner or Contact Person:
C
Mailing Add
�r lrS Z /� `7
County: s Telephone: c�7 2c
Present Classification: New Facility Existing Facility itJ
NPDES Per. No. NC00 Nondisc. Per. No.WQ Health Dept.Per No.
Rated by: u S Z Telephone: . -Ff5--?�00 Date: S^ l5—
Reviewed by: Health Dept. Telephone:
Regional Office Telephone:
Central Office Telephone:
ORC: Grade: Telephone:
Check Classification(s): Subsurface Spray Irrigation Land Appli
Wastewater Classi�tion: (C�le One) I ,�Ili IV Total Points:
____------- -_-------------------------- -----
SUBSURFACE CLASSIFICATION
(check all units that apply)
1, septic tanks
2. pump tanks
3. siphon or pump -dosing systems
4. sand filters
5. grease trapTnterceptor
&. oll/watef separators
7, gravity subsurface treatment and disposal:
a. pressure subsurface treatment and disposal:
SPRAY IRR)GATiON C1ASSIFiCAT)ON
(check 0 units that apply)
I —preliminary
treatment (definition no. 32 )
2,
lagoons
3.
septic tanks
4.
pump tanks
5.
pumps
6.
sand filters
7.
,—,grease trapFintarceptor
8.
o€I/water separators
9.
,_,_, disinfection
10.
chemical addition for nutrientlalgae 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 APPLICATIONIRESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of biosolids, residuals or contaminated soils on a designated sfte.
WASTEWATER TREA'rM EM FAG LITY C1ASSlF)CATION
The following systems shall be assigned a Class I classification, unjas the flow is of a significant quantify or the technology is unusually
complex, to require consideration by the Commission on a case -by -ease basis: (Check K Appropriate)
1. 0;I/watef Separator Systems consisting only of physical separation, pumps and disposal;
2. Septic TanklSand 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. Closed -loop Recycle Systems;
5. Groundwater Remediation Systems consisting only of o€I/wa€er separators, pumps, air -stripping, carbon adsorption, disinfection
and dispoml;
6. Aquacufture operations with discharge to surface waters;
7. Wafer Plant sludge handling and back -wash water treatment;
B. Seafood processing consisting of screening and disposal,
9. Single-family discharging systems, with the exception of Aerobic Treatment UniRs, 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)
Industrial Pretreatment Units or Industrla! Pretreatment Program (see definition No. 33)...................................................4
(2)
DESIGN
FLOW OF PLANT IN gpd (not applicable to non -contaminated cooing waters, sludge handling facilities for
water purification plants, totally closed cycle systems(sse definition No. 11), and facilities consisting only of Rem
(4)(d) or
Items (4)(d) and (11)(d)]
0 - 20,000............................................... ........................................................... .................................... 10
20,001 - 50,000......................................................................................................................................2
50.001 100,000............................................................................................................... ............a
100.001 - 250,000..................................................................................................................................A
250,001 50 0, 00 0......................................................... ................. I ......... ... I ...... .... ,,.......I...................... 5
500,001 - 1,000.000................................................................................................................................a
1.000.001 2,000,000...........................................................................................................................10
2,000.001 (and up) rate 1 point additional for each 200.000 gpd capacity up to a maximum of .............90
Design Flow (gpd)
(3)
PRELIM3NARY UNIT&PROCESSES (see definition No.32)
(a)
Bar Screens...............................................................................................................................................I
or
(b)
Mechanical Screens. Static Screens or Comminuting Devices ............ ............ ................................................ 2
(c)
Grit Removal..............................................................................................................................................1
or
(d)
Mecharcal or Aerated Grill Removal.............................................................................................................2
(a)
Flow Measuring Devk*...............................................................................................................................1
or
(1)
Instrumented Flow Measurement................................................................................................................2
(g)
Preaerallon...............................................................................................................................................2
(h)
Influent Flow Equalization...........................................................................................................................2
0)
Grease or Oil Separatom - Gravity.................................................................................................................2
Mechanical............. »..................................................................................................................................3
Dissolved Air Flotation................................................................................................................................5
( ])
Prechlortnatlon......... ............. ..................................... ,........................... .................................................
(4)
PR1MARYTREATMENT UNITSIPROCESSES
(a)
Septic Tank (sea definition No. 43)............................................................................................................2
(b)
Imhoff Tank.............................................................................................................................................5
(c)
Primary Clariflers....................................................................................................:....................................5
(d)
Settling fronds or Settling Tanks for Inorganic Nort-toxic Materials (sludge handling facilities for water
purification plards, sand, gravel, stone, and other mining operations except recreational activities such as ge
orgold mining) ............. ........................................... .............................................................................
(5)
�2
SECONDARY TREATMENT LNITWROCESSES
(a)
Carbonaceous Stage
(1) Aeration -High Purity Oxygen System.............................................._.........._..........„......20
Diffused Air System.......................................................................................................10
Mechanical Alr System (fixed, floating or rotor) ................................ .._........_-------_---S
Separate Sludge Reaeraflon.............................................................................................3
(11) Trickling Filter
HighRate...............................................................................................................„......7
StandardRate...............................................................................................................5
PackedTower................................................................................................................5
(111) Biological Aerated Filter or Aerated Biological Filer ...„..„......„..... „ .„... ... ..„... ...„.1 0
(Iv) Aerated Lagoons... ....................................................................................................... 10
(v) Rotating Biological Contactors......................................................................................10
(vf) Sand Filters -intermittent biological ........................ ............................ „........................... 2
Recirculating biological.....................................................................................................3
(vll) Stabilization Lagoons....................................................................................................3
(vill) clarifier ..........................................................................................................................5
(Ix) Single stage system for combined carbonaceous removal of BOD and nitrogenous removal by
nitrtlication (see deflnitlon No. 12)(Poinis for this item have to be In addition to items
(5)(a)(1) through (5)(a)(viil),
utlllzing the extended aeration process (see deffnillon No.3a)..........................................2
utilizing other than the extended aeration process ............ ............................................ 8
(x) Nutrient additions to enhance BOD removal.....................................................................5
(11) Biological Culture ('Super Bugs')addition..................................................1.....................5
(b)
Nitrogenous Stage
{Ij Aeration - High Purity Oxygen System.............................._.............................................20
Diffused Air System.......................................................................................................1 0
Mechanical Air System (fixed, floating or rotor)................................................................8
Separate Sludge Reaeratlon............................................................................................3
(il} Trickling Filter -High Rats.................................................................................................7
StandardRats...............................................................................................................5
Packed Tower..........................................................................................................
(III) Biological Aerated Filter or Aerated Biological Filter.„_. ._ ... _. .... „. 10
(Iv) Rotating Biological Contactors......................................................................................10
(v) Sand falter - Interm'tttert biological................................................................... ..........2
Recirculating biologlcal.....................................................................................................3
(vl) Clarifier ........................
(6)
TEMIAMORADVANCED TREATMENT UNfWFIOCESSES
(a)
Activated Carbon Beds -
withoutcarbon regeneration...................................................................................................5
with carbon regeneration.......................................................................................................I S
(b)
Powdered or Granular Activated Carbon Feed -
without carbon regeneration.................................................................................................5
withcarbon regeneration.....................................................................................................15
(c)
Air sirlpping.............................................................. ..............................................................................5
(d)
DenitAlcation Process ........................................ _.....«.............................................................................10
(a)
Electrodlalysls............................................................................................................................................5
{i)
Foam Separation......................................................................................................................................5
(9}
Ion Exchange... ... ..... ...... ..... ...................5
(h)
Land Application of Treated Effluent (see defirthlon No. 22b) (not applicable for sand, gravel, stone
and other similar mining operations) by high rate{nfitlratlon.„...„...„...._...„......„...........„...._........._...4
{I)
Mloroscreena .... .......... ................................................„........5
(()
Phosphorous Removal by Biological Processes (See dennhlon No. 26)........................................................20
(k)
Polishing Ponds - without aeration ............... _...................................................... ........................ ............. 2
withaeration ................. ... .............. ..................... .................................................... S

(1) Post Aeration - cascade ................................ .................... ...................................... .................................... a
diffusedor mechanical........................................................................................................2
(m) Reverse Osmosis........................................................................................................................................4
(n) Sand or Mixed -Media Filters - low rate..........................................................................................................2
highrate .............. ..................... .................................. .s
(o) Treatment processes for removal of metal or cyanide................................................................................__.1 5
(p) treatment processes for removal of toxic materials other than metal or cyanide..............................................1 5
(7) SLUDGE TREATMENT
(a) Sludge Digestion Tank - Heated (anaerobic)...............................................................................................10
Aerobic..............................................................................................................................................5
Unheated(anaerobic) ...................................... ......................................................................................... 3
(b) Sludge Stabilization (chemical orlhermal)....................................................................................................5
(c) Sludge Drying Beds - Gravity......................................................................................................................2
VacuumAssisted.......................................................................................................................................5
(d) Sludge Elutriation.....................................................................................................................................5
(e) Sludge Condhloner (chemical or thermal)....................................................................................................5
(1) Sludge Thickener (gravity)..................................................... .............................................. ........................
(g) Dissolved Air Flotation Unit [not applicable to a unit rated as(3)(1)]......... ................................................... a
(h) Sludge Gas Utilization (including gas storage). ..................................... ............................. ................... 2
(1) Sludge Holding Tank - Aerated...................................................................................................................5
Nor-aerated.............................................................................................................................................2
(j) Sludge Incinerator (not Including activated carbon regeneration)................................................................10
(k) Vacuum Filter, Centrifuge, or Etter Press or other similar dewataring devices...................................................1 0
(8) RESIDUALS UTILiZATIOWDISPOSAL (includ ng 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
orlandfill permit........................................................................................................................................2
(c) Dedicated Landfiil(budal) by the permlttee of the wastewater treatment facility...............................................5
(9) DISt+FECTIC7J
(a) Chlorination..............................................................................................................................................5
(b) Dechlorination............................ ................................................................................................. ........ .....5
(c) Ozone......................................................................................................................................................4
(d) Radiation............................................................................................................................ .....................
(1 0) CHEMICAL ADDITION SYSTEM(S) ( see definition No. 9) [not applicable to chemical additions rated as hem (3)G),
(5)(a)(xi), (6)(a), (6)(b). (7)(b), (7)(e), (9a), (9)(b) or (9)(c) 5 points each.
List..................................................................................................................... .........5
...................................................................................................................................5
.............................................................................................................................. S
........................................................................................................................5
(11) MISCELLANEOUS UNfr&PROCES5E5
(a) Holding Ponds, Bolding 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............................................................................................................................4
(b) Effluent Flow Equalization (not appicabla to storage basins which are Inherent in land application systems).....2
(c) Stage Discharge (not applicable to storage basins inherent In land application systems) ..................................
(d) Pumps. ...........................................................................................................................
(a) Stand -By Power Supply..................................................................................................................... ...
(1) Thermal Pollution Control Device.................................................................................................................3
TOTAL POINTS..........................................................................
CLASSIFICATICN
ClassI...........................................................................................................5.25 Points
ClassII......................................................................................................... 26-50 Points
ClassIn........................................................................................................51.85 Points
ClassW.......................................................................................................66-Up Points
Facilhles having a rating of one through four points, Inclusive, do not require a cartified operator.
Facilities having an activated sludge process will be assigned a minimum class111catlon of Class II.
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 classification of Class III.
--------------------.----------------------------------
4004 DEFINUIONS
The following definitions shall apply throughout this Subchapter.
(1) Activaled Carbon Beds. A physical/chemicat 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 gaflons 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 artificially
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, agltatlon or diffuslon,(3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detenlion time of 18 hours.
(4) Agriculluralfy managed she. Any she 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 converted to dissohred 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 tt*
absorbed Impuritles;
(7) Carbonaceous Stage. A stage of wastewater treatment designed to achieve 'secondary' effluent limits;
(8) Centrifuge. A mechanical device In which centrifugal force is used to separate solids from liquids or to separate liquids of different denshlas;
(9) Chemical Addition Systems- The additlon of chemical(s) to wastewater at an application point for purposes of improving solids removal, pH adjustment,
alkalinity control, etc.; the capability to experiment with difflerent chemicals and Wierent application points to achieve a specHIc, result wilt be considered one
system; the capability to add chernical(s) to dual units wilf 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 time, 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 BOO and Nitrogenous Removal by Nitrification- A single stage system required to achieve permit effluent limits on BOD
and ammonia nitrogen within the same biological reactor,
(13) DecNodnatlon. The partial or complete reduction of residual chlorine In a liquid by any chemical or physical process;
(14) Denhritication Process. The conversion of nhrate-nitrogen to nitrogen gas;