WQ0000889_Final Permit_20030530

� WATF
�� RQ Michael F. Easley, Governor
dWilliam G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
p Alan W. ision of P.E._ Director
Division of water Quality
May 30, 2003
T_L. BAKER — ENVIRONMENTAL AFFAIRS MANAGER
PCS PHOSPHATE COMPANY, INC.
POST OFFICE Box 48
1530 NC HWY 306 SouTH
AURORA, NORTH CAROLINA 27806
Subject: Permit No. WQ0000889
PCS Phosphate Company, Inc.
Wastewater Treatment and High Rate
Infiltration Facilities
Beaufort County
Dear Mr. Baker:
In accordance with your modification request received September 12, 2002, and subsequent additional
information received March 19, 2003, we are forwarding herewith Permit No. WQ0000889, dated May 30, 2003,
to PCS Phosphate Company, Inc. for the construction and continued operation of the subject wastewater treatment
and high rate infiltration facilities.
This permit shall be effective from the date of issuance until November 30, 2003, shall void Permit No.
WQ0000889 issued March 31, 1998, 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, 6714 Mail Service Center, Raleigh, NC 27699-
6714. 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 platter, please contact Nathaniel Thornburg a� [phone] extension 533.
Sincerely,
-K.Alan W. Klimek, P.E.
cc. Beaufort County Health Department
Washington Regional Office, Water Quality Section
Washington Regional Office, Groundwater Section
Technical Assistance and Certification Unit
Water Quality Central Files
NDPU Files
Non -Discharge Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet http:flh2o,enr.state.nc.us/udpu
Telepbone [phone] Fax [phone]
Telephone [phone]
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NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
HIGH RATE INFILTRATION 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
PCS Phosphate Company, Inc.
Beaufort County
construction and operation of seven (7) simplex pump stations each with an 18 gallon per minute (GPM)
submersible grinder pump and high water alarms, approximately 1,450 linear feet of 2-inch force main and
approximately 500 linear feet of 3-inch force main, two (2) 5,000 gallon anoxic tanks (one per train) with mixers,
and
continued operation of a 30,000 gallon per day (GPD) wastewater treatment and high rate infiltration facilities
consisting of forty-one (41) simplex pump stations each with an 18 GPM submersible grinder pump and high
water alarms, approximately 354 linear feet of two-inch force main, approximately 7,110 linear feet of three-inch
force main, approximately 3,171 linear feet of four -inch force main, dual 125 GPM pump stations with dual
submersible pumps and high water alarms, a flow monitoring manhole, two (2) 14,960 gallon equalization tanks
each with two (2) 21 GPM submersible grinder pumps and one (1) 15 cubic foot per minute (CFM) blower, a flow
splitter box, two (2) 5,000 gallon anoxic tanks with mixers, two (2) 10,000 gallon aerobic tanks with two (2) 145
CFM blowers, two (2) 6,200 gallon clarifiers, a 5,000 gallon aerobic digester, four (4) 6,200 gallon sludge holding
tanks, two (2) 5 foot diameter fitters equipped with a 5,000 gallon dosing tank with dual submersible 21 GPM
pumps, a 15 CFM blower and a 5,000 gallon backwash holding tank with dual submersible 210 GPM pumps, an
ultraviolet disinfection system, a 632 gallon chlorine contact chamber with tablet chlorination, a 3,441 gallon
effluent dosing tank with three (3) 42 GPM suction pumps, approximately 459 linear feet of 2-inch force main,
three (3) effluent meters, three 6,400 square foot (ft2) rapid infiltration fields (totaling 19,200 ft2), a diesel
powered generator and all associated valves, pumps and appurtenances to serve the PCS Phosphate Aurora
Division, with no discharge of wastes to the surface waters, pursuant to the application received September 12,
2002, and subsequent additional information received by the Division, 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 November 30, 2003, shall void Permit No.
WQ0000889 issued March 31, 1998, and shall be subject to the following specified conditions and limitations:

I. PERFORMANCE STANDARDS
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 competed 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 completed. Mail the Certification to the Non -Discharge
Permitting Unit, 1617 Mail Service Center, Raleigh, NC 27699-1617.
2. The Washington Regional Office, telephone number [phone], shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in-place inspection can be
made. Such notification to the regional supervisor shall be made during the normal office hours from
8`00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
3. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective actions, including those actions that may be
required by the Division of Water Quality (Division), such as the construction of additional or
replacement wastewater treatment or disposal facilities.
4. 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. The ponding of
wastewater on the surface of the distribution field when the dosing cycle commences shall be
considered as evidence of failure of the soils to adequately assimilate the wastewater. Additionally,
such failure shall be interpreted as a violation of this permit condition.
S. 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 Division.
6. Adequate measures shall be taken to divert stormwater from the high rate infiltration area and to
prevent wastewater runoff.
7. Diversion or bypassing of the untreated wastewater from the treatment facilities is prohibited.
8. 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.

9. The following buffers shall be maintained:
a. 10 feet between high rate infiltration unit and any on -property residential units that are to be sold
(e.g., condominiums, subdivisions),
b. 500 feet between high rate infiltration unit and any impounded public surface water supply or
public shallow (less than 50 feet deep) ground water supply,
c. 100 feet between high rate infiltration unit and any private or public water supply source,
d. 200 feet between high rate infiltration unit and any streams classified as WS or B.
e. 200 feet from mean high water between high rate infiltration unit and any "SA" or "SB" classified
surface waters,
f. 200 feet from normal high water between high rate infiltration unit and any other stream, canal,
marsh, or coastal waters,
g, 200 feet from normal high water between high rate infiltration unit and any Class I or Class 11
impounded reservoir used as a source of drinking water,
h. 200 feet between high rate infiltration unit and any other lake or impoundment,
L 200 feet between high rate infiltration unit and any Drainage systems (ditches, drains, surface
water diversions, etc.) and from any groundwater lowering and surface drainage ditches,
j. 50 feet between high rate infiltration unit and property lines,
k. 50 feet between treatment units and property lines, and
1. 50 feet between high rate infiltration unit and public right of ways.
Some of the buffers specified above may not have been included in previous permits for this waste
treatment and disposal system. These buffers are not intended to prohibit or prevent modifications,
which are required by the Division, to improve performance of the existing treatment facility. These
buffers do, however, apply to modifications of the treatment and disposal facilities which are for the
purpose of increasing the flow that is tributary to the facility. These buffers do apply to any
expansion or modification of the high rate infiltration areas and apply in instances in which the sale of
property would cause any of the buffers now complied with, for the treatment and disposal facilities,
to be violated_ The applicant is advised that any modifications to the existing facilities will require a
permit modification.
10. A usable green area shall be maintained for wastewater disposal. The green area shall have the
capability of accommodating the average daily flow of the facility being served without exceeding
the loading rates of the green area. A "green area", as defined in 15A NCAC 2H .0404 (g)(7), is an
area suitable for waste disposal, either in its natural state or which has been modified by planting a
vegetative cover of grasses or low growing shrubbery.
11. OPERATION AND MAINTENANCE REQUIREMENTS
The facilities shall be properly maintained and operated at all times.
Upon classification of the wastewater treatment and spray irrigation facilities by the Water Pollution
Control System Operators Certification Commission (WPCSOCC), the Permittee shall designate and
employ a certified operator to be in responsible charge (ORC) and one or more certified operator(s)
to be back-up ORC(s) of the facilities in accordance with 15A NCAC 8G .0201. The ORC shall visit
the facilities in accordance with 15A NCAC 8G .0204 or as specified in this permit and shall comply
with all other conditions specified in these rules.
The application rates for the high rate infiltration system shall not exceed 8 inches per day per rapid
infiltration field.
4. The facilities shall be effectively maintained and operated as a non -discharge system to prevent the
discharge of any wastewater outside of the high rate infiltration disposal area, which result from the
operation of this facility.

5. No traffic or equipment shall be allowed on the disposal area except while installation occurs or
while normal maintenance is being performed.
6. The spray beds shall be raked twice weekly during the months April through October and once a
week during [he months of November through March.
7. The screenings removed from the wastewater treatment plant shal I be properly disposed in a sanitary
landfill or by other means that have been approved by this Division_
8. Vegetative growth must be kept out of the spray bed areas at all times. All vegetation must be
removed manually so that minimal disturbance will occur to the disposal area.
9. The application of chemicals to the distribution field(s) is expressly prohibited.
10. An automatically activated standby power source shall be on site and operational at all times. If a
generator is employed as an alternate power supply, it shall be tested weekly by interrupting the
primary power source -
IL Diffusers shall be cleaned as needed to ensure that adequate aeration is provided. Records of this
maintenance shall be maintained by the Pennittee.
12. The chlorine tablets used in the disinfection facility shall be of the kind and type specified in the
plans and specifications approved by the Division.
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. Adequate records shall be maintained by the Permittee tracking the amount of wastewater disposed.
These records shall include, but are not necessarily limited to, the following information:
a. date of irrigation,
b. volume of wastewater irrigated,
c. field irrigated,
d. length of time field is irrigated,
e. continuous weekly, monthly, and year-to-date hydraulic (inches/acre) loadings for each field, and
f. weather conditions.
3. Influent flow shall be continuously monitored and daily flow values shall be reported on Form
NDMR.
The Permittee shall install an appropriate flow measurement device consistent with approved
engineering and scientific practices to ensure the accuracy and reliability of influent flow
measurement. Flow measurement devices selected shall be capable of measuring flows with a
maximum deviation of less than 10 percent from true flow, accurately calibrated at a minimum of
once per year, and maintained to ensure that the accuracy of the measurements is consistent with the
accepted capability of that type of device. Records of flow measurement device calibration shall be
kept on file by the Permittee for a period of at least three years. At a minimum, data to be included in
this documentation shall be:
a. Date of flow measurement device calibration
b. Name of person performing calibration
c. Percent from true flow
4

4. As an indicator of proper operation and maintenance, the facility shall produce an effluent in
compliance with the following limitations:
Parameter
J
Monthiz Average
C
Daily Maximum
Flow
30,000 GPD
BOD5 (5-day, 20°C)
10 mg/l
15 mg/1
NH3 as N
4 mg/l
6 mg/l
TSS
5 mg/l
10 mg/l
Fecal Coliform
200 per 100 ml b
The effluent pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
a
Monthly averages for all but fecal coliform shall be the arithmetic mean of all samples collected
during the reporting period.
b
Monthly average for fecal coliform shall be the geometric mean of all samples collected during the
reporting period.
Daily maximum shall be the maximum value of all samples collected during the reporting period.
The effluent from the subject facilities shall be monitored, by the Permittee, at specific location for
the following parameters:
Parameter
SaIppling Point
SaLngling FrequencyEEequency
Type of Sample
Flow
Influent or Effluent
Continuous
Recording
BOD5 (5-day, 20°C)
Effluent
*2/Month
Composite
NH3 as N
Effluent
*2/Month
Composite
TSS
Effluent
*2/Month
Composite
Fecal Coliform
Effluent
*2/Month
Grab
Settleable Matter
Effluent
Daily
Grab
Residual Chlorine
Effluent
***Daily
Grab
NO3
Effluent
Triannually
Grab
TDS
Effluent
**Triannually
Grab
TOC
Effluent
**Triannually
Grab
Chloride
Effluent
Triannually
Grab
PH
Effluent
**Triannually
Grab
* 2/Month sampling frequency only during the months of April through October. During the
remainder of the year, these parameters shall be monitored monthly.
** Triannually sampling shall be conducted during March, July, and November
*** Daily monitoring required only when the chlorination system is in use
If Groundwater sampling indicates or predicts problems with compliance with of the Groundwater
Standards, this permit will be modified to include additional and/or more restrictive limitations.
5

Three (3) copies of all monitoring data [as specified in Conditions M(3) and 11I(4)] on Form NDMR-
1 and three (3) copies of all operation and disposal records [as specified in Condition I11(2)] on Form
NDAR-1 shall be submitted on or before the last day of the following month. All information shall
be submitted to the following address:
NC Division of Water Quality
Water Quality Section
Non -Discharge Compliance/Enforcement Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
6. A record shall be maintained of all residuals removed from this facility. The record shall include the
name of the hauler, the permit authorizing the disposal or a letter from a municipality agreeing to
accept the residuals, the date the residuals were hauled, and the volume of residuals removed.
7. A maintenance log shall be maintained at this facility including, but not limited to, the following
items:
a. Daily sampling results including dissolved oxygen in the aeration basin and at the clarifier weir,
b. Visual observations of the plant and plant site;
c. Record of preventative maintenance (changing of filters, adjusting belt tensions, alarm testing,
diffuser inspections and cleanings, etc.);.
d. Date of calibration of flow measurement device;
e. Date and results of power interruption testing on alternate power supply; and
f. Dates fields were raked and arms inspected.
8. Noncompliance Notification:
The Permittee shall report by telephone to the Washington Regional Office, telephone number (252)
946-6481, 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 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.
Occurrences outside normal business hours may also be reported to the Division's Emergency
Response personnel at telephone number [phone], [phone], or [phone].
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
Existing monitor wells MW-1, MW-2, MW-3 and MW-4 shall be sampled every March, July and
November for the following parameters:
Nitrate (NOO
Fecal Coliform
Total Dissolved Solids (TDS)
Water Level
Chloride
Total Organic Carbon (TOC)
PH
Ammonia Nitrogen
Volatile Organic Compounds (VOCs)'
' Sampled in November only using one of the following methods
(A) Standard Method 6230D, PQL at 0.5 gg/L or less
(B) Standard Method 6210D, PQL at 0.5 µg/L or less
(C) EPA Method 8021, Low Concentration, PQL at 0.5 pg/L or less
(D) EPA Method 8260, Low Concentration, PQL at 0.5 µg/L or less
(E) Another method with prior approval by the Groundwater Section Chief
Any method used shall meet the following qualifications:
(1) A laboratory shall be DWQ certified to run any method used.
(2) The method used shall, at a minimum; include all constituents listed in Table VIH of Standard
Method 6230D.
(3) The method used shall provide a PQL at 0.5 µg/L or less, which shall be supported by laboratory
proficiency studies as required by the DWQ Laboratory Certification Unit. Any constituents
detected above the MDL but below the PQL at 0.5 µg/L shall be qualified (estimated) and
reported.
If any volatile organic compounds are detected using the methods listed, then the Washington
Regional Office Groundwater Supervisor, telephone number [phone], shall be contacted
immediately for further instructions regarding any additional follow-up analyses required. The
results of all initial and follow-up analyses shall be submitted simultaneously.
The measurement of water levels shall be made prior to sampling for the remaining parameters. The
depth to water in each well shall be measured from the surveyed point on top of the casing.
If TOC concentrations greater than 10 mg/L are detected in any downgradient monitoring well,
additional sampling and analysis shall be conducted to identify the individual constituents comprising
this TOC concentration. If the TOC concentration as measured in the background monitor well
exceeds 10 mg/L, this concentration will be taken to represent the naturally occurring TOC
concentration. Any exceedances of this naturally occurring TOC concentration in the downgradient
wells shall be subject to the additional sampling and analysis as described above.
The results of the sampling and analysis must be received on Form GW-59 (Groundwater Quality
Monitoring: Compliance Report Form) by the- Groundwater Section, Permits and Compliance Unit,
PO Box 29578 Raleigh, NC 27626-0578 on or before the last working day of the month following the
sampling month.

2. The COMPLIANCE BOUNDARY for the disposal system is specified by regulations in 15A NCAC
2L, Groundwater Classifications and Standards. The Compliance Boundary for the disposal system
individually permitted after December 31, 1983 is established at either 250 feet from the waste
disposal area, or 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 according to 15A NCAC 2L .0106(d)(2).
The 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 action in accordance with 15A NCAC 2L .0106(d)(1).
V. INSPECTIONS
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 wastewater treatment and disposal 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 Ieast 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.
3. 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
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.
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.
4. The subject wastewater treatment and disposal facilities shall be connected to an operational publicly
owned wastewater collection system within 180 days of its availability to the subject facilities, if the
subject wastewater treatment or disposal facilities are in noncompliance with the terms and
conditions of this non -discharge permit or the governing statutes or regulations. Prior to the initiation
of these connection activities, appropriate approval must be received from this Division.
5. 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

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 issuance of this permit does not exempt 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, including but not limited to applicable river buffer rules in 15A
NCAC 2B.0200, erosion and sedimentation control requirements in 15A NCAC Chapter 4 and under
the Division's General Permit NCG010000, and any requirements pertaining to wetlands under 15A
NCAC 213 .0200 and 2H ,0500.
A set of approved plans and specifications for the subject project must be retained by the Permittee
for the life of this project.
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 thisthe30th day of May, 2003
NORTH V 'ROLINA E ONMENTAL MANAGEMENT COMMISSION
Z7
j
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0000889
N

Permit No. WQ0000889
May 30, 2003
ENGWEER'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.
to

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FIGURE 1
PCS PjiOSPHATE COMPANY
3a,000 GPD DOMESTIC WASTEWATER
TREATMENT SPRAY IRRIGATION FACILITY
BEAUFORT COUNTY
WQ00008$ 98013
SITE LOCATION MAP
46

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PCS PHOSPHATE COMPANY
30,000 GPD DOMESTIC WASTEWATER
TREATMENT SPRAY IRRIGATION FACILITY
i BEAUFORT COUNTY
W0OQ000091QW9001 3

WATER POLLUTION CONTROL SYSTEM OPERATORS
CERTIFICATION COMMISSION
CLASSIFICATION
RATING SHEET FOR WATER PQLLUTTON CONTROL SYSTEMS
FACILTTY LWORMATION_
NAME OF FACII.TI`Y:
MAILING ADDRESS: �' SIC LM H
'
COU-NI'Y:
CONTACT PERSON: K6k HONE: S Z) 2 Z- Z
PERMIT NO:�,,a (To�v) Check One: NC WQ 2� HEALTH DP
ORC: - �l - , �_ TELEPHONE: (`)
RATUqG r, FOR_VLATlQN': (Before compietinu this se i please refer to pies 2 ')
C_ - �Pt7
PE�►-. F ! ,o -: C� C'� ', bNR? 'YES NO
C ArIOh : -WAS ice,: 1 2,_ ;
COLLECTION: 1 2 3 4
SPRAY IRRIGATION SUBSURFACE LAND APPLICATION
PHYSICAL/CEnNUCAL GRADE I
GRADE H
1
R = BY: r� C- REGION: v DATE: 1,q l ,C }
- r r
REGIONAL Or'FTCE T=HO-\-r- � m-7K- ESL) I . EXT: 31 �

Classification of Biological Water Pollution Control Treatment Systems:
Grade l Biological WKS
- Septic tarWsand filter systems F
- Biological lagoon systems
- Constructed wetlands and associated appurtenances
Grade II Biological WPCS
- Systems that utilize an activated sludge or fixed growth process with a permitted flow
less than or equal to OS million gallons per day (mgd)
Grade III Biological WPCS
Systems that utilize an activated sludge or fixed growth process with a permitted flaw
of greater than OS through 2.5 mullion gallons per day (mgd)
- Grade II systems that are required to achieve biological nutrient reduction * -
Grade IV Biological WPCS
y- Systems that utilizing an activated sludge or fixed growth pro---ss with a permitted flow
of greater than 2-5 million gallons per day (mad)
Grace III systems that are required to achieve biological nutrient reduction * .
Biological Nutrient Reduction -
The reduction of total nitrogen or total piaospnorous b}' ar activated sludge orjzxed growth
process as required by the faciliries permir.
Classification of Collection Water Pollution Control Systems:
(whichever provides lowest grade)
Sarni grade as biological water pollution control system. Grade of system:
Based on population served-
1.500 or Less = Grade l LL .
1,501 to 15,000 = Grade II
15,001 to 50,000 = Grade III
50,001 or more = Grade IN

Classification of Spray Irrigation Water Pollution Control Systems:
Systems which utilize spray irrigation for the reuse or disposal of wasterwater.
These systems include: septic tanks, sand filter, gillwatcr separators, lagoons,
storage basins, screening, sedimentation. Systems other than those listed above
shall be subject to additional classification.
Classification of Land Application of Residuals Systems:
Systems pa, rmitted and dedicated for land application of residuals that are produced by a
water pollution control system or contaminated soils.
Classification of Phvsical/Chemical Water Pollution Control Treatment Systems:
Grade i Physical/Chemical: Any water pollution control system that utilizes a pzima�- Hy
physical process to treat wastewater. This classification includes groundwater
mmediation systems. **
Craac fi PhysicaUChemical: Any water pollution control system that utiiizes a pmn ijy
chemi:al process to treat wastewater. This classification includes �4verse osmQs'e,
ele.-=odialvsis, and ultiaf:lt-arion systems. **
Any water pollution control system that utilizes a phyicaUchemical process to enhcnoe ar
activated sludge or ftxed growth process, shall not be subject to addirionaI classification.
Classification of Subsurface Water Pollution Control Systems: -
Systems which utilize the soil for subsurface treatment and disposal of wastewater
and/or are rnauired to have a certified operator under I5A NCAC 18A-1961
.any subsurface system that has as pan of its treatment process a water pollution control
systems that may be classi)7ed under Rules .0302 through .0307 of this section shall be
subject to addional class cation.

Definitions
Activated Sludge - shall mean a biological wastewater treatment process in which predominantly
biodegradable polluntants in wastewater are absorbed, or adsorbed by living aerobic organisms and
Chemical Process - shall mean a wastewater pollution control system process consisting
exclusively of the addition of chemicals to treat wastewater.
Collection System - shall mean a continuous connections of pipelines, conduits, pumping
stations, and other related constructions used to conduct wastewater to the water pollution
Control SystCm
Elecirodialvsis System - shall mean a system ut3izmg a selective sepa•-ation of dissolved solids
process fiat is based on electrical charge and diffusion through a semipermeable membrane.
Physical Process - shall mean any water pollution control system process consisting of
electradiaiysis, adsorption, absorption, air stripping, gravimetric sedim--ntation, floation, and
filtration as a rn ans of tmatment
Reverse Osmosis System - shall m�aan a system which utilizes solutions and semipermablc
membrancs to separate and treat wastewater.
Utrafiltration System - shall mean a syst--m which of izes a membrane Hirer to remove
pollutants from wastewater.
Water Pollution Control System - shall mean any system for the collection, treatment, or
disposal of wastewater and is classified under the provision of G.S. 90A-37.
Nate: PIeese re.Ier to G.S. 90.4-37 for additiormml information and definitions