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HomeMy WebLinkAboutWQ0019907_Final Permit_20020912- FWarF �0 R� Michael F. Easley, Governor William G- Ross Jr., Secretary i~ North Carolina Department of Environment and Natural Resources Q `C Alan W. Klimek, P.E., Director Division of Water Quality September 12, 2002 Mr. Phin Horton, Town Manager Town of Holly Ridge 212 Dyson Street Holly Ridge, North Carolina 28445 Subject: Permit No. WQ0019907 Holly Ridge WWTP Wastewater Spray Irrigation Onslow County Dear Mr. Horton: In accordance with your application received May 27, 2001, and additional information received September 14, 2001, June 20, 2002 and August 8, 2002, we are forwarding herewith Permit No. WQ0019907 dated September 12, 2002 to Town of Holly Ridge for the construction and operation of the subject wastewater treatment and spray irrigation facilities. This permit shall be effective from the date of issuance until August 31, 2007, shall void Permit No. NCO025895 issued June 7, 2002, 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 matter, please contact Bennie Goetze, Jr., P_ . ate 919) 733-5083 extension 375. Since/r y, / /(Alan W. Klimek, P.E. cc: Onslow County Health Department Wilmington Regional Office, Water Quality Section Wilmington Regional Office, Groundwater Section Groundwater Section, Central Office Right Angle Engineering, P. C. Technical Assistance and Certification Unit Non -Discharge Compliance/Enforcement Unit Water Quality Central Files N )PiT Files Non -Discharge Permitting Unit Internet http://h2o.enr.state.nc.us/ndpu `d �R=t 1617 Mail Service Center, Raleigh, NC 27699-1617 Telephone (919) 733-5083 Fax (919) 715-6048 DENR Customer Service Center Telephone 1 800 623-7748 An Equal Opportunity Action Employer 50% recycled/10% post -consumer paper NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES RALEIGH SPRAY IRRIGATION 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 Town of Holly Ridge Onslow County FOR THE construction and operation of a 260,626 GPD spray irrigation treatment and disposal facility consisting of headworks with manual bar screen and grit chamber, influent flow measurement with ultrasonic flow meter; a 1.82 MG treatment lagoon with three (3) aeration cells (cells 1 & 2 each have 2 -- 25 Hp aerators with anti -erosion baffles, cell 3 has 2 — 25 Hp mixers with anti -erosion baffles), a 0.49 MG settling cell; UV disinfection; a 22,400 gal, aerobic sludge digester with a 2 Hp aerator and 3 Hp discharge pump; an effluent pump station with duplex 450 gpm pumps; 17, 900 feet of 8-inch force main; a 13.30 MG storage lagoon (51 days storage); a 250 acre spray field with 100.05 wetted acres, and an irrigation pump station with dual 700 gpm pumps and effluent flow meter; to serve the Town of Holly Ridge, with no discharge of wastes to the surface waters, pursuant to the application received May 27, 2001, and additional information received September 14,.2001, .Tune 20, 2002 and August 8, 2002, 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 August 31, 2007, shall void Permit No. NCO025895 issued June 7, 2002, and shall be subject to the following specifi& 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 roject is to be completed in phases and partially certified you shall retain the responsibility to track further construction approved under the same permit, and shall provide a final certificate of completion once the entire project has been completed. Mail the Certification to the Non -Discharge Permitting Unit, Division of Water Quality, 1617 Mail Service Center, Raleigh, NC 27699-1617. 2. The Wilmington Regional Office, telephone number (910) 395-3900, shall be notified at Ieast 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. The spray irrigation facilities shall be effectively maintained and operated at all times so that there is no discharge to the surface waters, nor any contamination of ground waters which will render them unsatisfactory for normal use. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions or failure of the irrigation area to adequately assimilate the wastewater, 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 and disposal facilities. 4. 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. 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. Diversion or bypassing of the untreated wastewater from the treatment facilities is prohibited. The following buffers shall be maintained: a) 400 feet between wetted area and any residence or places of public assembly under separate ownership, b) 150 feet between wetted area and property lines, c) 100 feet between wetted area and wells, d) 100 feet between wetted area and drainageways or surface water bodies, e) 50 feet between wetted area and public right of ways, f) 100 feet between wastewater treatment units and wells, and g) 50 feet between wastewater treatment units and property lines. 11. OPERATION AND MAINTENANCE REQUIREMENTS The facilities shall be properly maintained and operated at all times. 2. Upon classification of the facility by the Water Pollution Control System Operators Certification Commission (WPCSOCC), the Permittee shall employ a certified wastewater treatment plant operator to be in responsible charge (ORC) of the wastewater treatment facilities. The operator must hold a certificate of the type and grade at least equivalent to or greater than the classification assigned to the wastewater treatment facilities by the WPCSOCC. The Permittee must also employ a certified back- up operator of the appropriate type and grade to comply with the'Conditions of 15A NCAC 8G .0202. The ORC of the facility must visit each Class I facility at least weekly and each Class II, III, and IV facility at least daily, excluding weekends and holidays, and must properly manage and document daily operation and maintenance of the facility and must comply with all other conditions of 15A NCAC 8G .0202. Once the facility is classified, the Permittee must submit a letter to the WPCSOCC which designates the operator in responsible charge within thirty days after the wastewater treatment facilities are 50% complete. A suitable year round vegetative cover of Coastal Bermuda and small grains shall be maintained. Crop removal is essential to remove the nutrients absorbed from the wastewater. Therefore, the Coastal Bermuda shall be harvested 3 to 4 times per growing season when the grass reaches a height of 15 to 18 inches. The grain shall be harvested for grain and then for straw when it reaches maturity. 4. Irrigation shall not be performed during inclement weather or when the ground is in a condition that will cause runoff. Adequate measures shall be taken to prevent wastewater runoff from the spray field. 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. 2 7. The application rate shall not exceed a cumulative loading of 36.92 inches over any twelve (12) month period for all but Field 2B where the application rate shall not exceed a cumulative loading of 21.84 inches over any twelve (12) month period. The instantaneous application rate shall not exceed 0.12 in/hr. 8. No type of wastewater other than that from the Town of Holly Ridge shall be sprayed onto the irrigation area. 9. No traffic or equipment shall be allowed on the disposal area except while installation occurs or while normal maintenance is being performed. 10. Public access to the land application sites shall be controlled during active site use. Such controls may include the posting of signs showing the activities being conducted at each site. 11. Freeboard in the spray field lagoon shall not be less than two feet at any time. 12. A waste -level gauge, to monitor waste levels in the storage pond, shall be installed within 60 days of issuance of this permit_ This gauge shall have readily visible permanent markings indicating the maximum liquid level at the top of the temporary liquid storage volume, minimum liquid level at the bottom of the temporary liquid storage volume, and top of the dam elevations. Caution must be taken not to damage the integrity of the liner when installing the gauge. 13. A protective vegetative cover shall be established and maintained on all earthen basin embankments (outside toe of embankment to maximum pumping elevation), berms, pipe runs, erosion control areas, and surface water diversions. Trees, shrubs, and other woody vegetation shall not be allowed to grow on the earthen basin dikes or embankments. Earthen basin embankment areas shall be kept mowed or otherwise controlled and accessible. 14. The Leon soils shall be chisel plowed to break up the hardpan prior to beginning operations. These areas shall be reevaluated by a licensed soil scientist prior to permit renewal to determine if additional plowing is required. If required, certification that this plowing has been done shall be submitted with the renewal application. III. MONITORING AND REPORTING REQUIREMENTS 1. Any monitoring (including groundwater, surface water, soil or plant tissue analyses) deemed necessary by the Division to insure surface and ground water plotection 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, f. weather conditions, g. maintenance of cover crops, and h. the water level in piezometers in the spray field. 3 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. FIow 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. Three (3) copies of all operation and disposal records (as specified in condition III 2) on Form NDAR-1 and three (3) copies of all effluent monitoring data (as specified in condition 1113 and lII 4) on Form NDMR-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 5. A representative annual soils analysis (Standard Soil Fertility Analysis) shall be conducted on each spray field and the results maintained on file by the Permittee for a minimum of five years. The Standard Soil Fertility Analysis shall include, but is not necessarily limited to, the following parameters: Acidity Calcium Copper Magnesium Cation Exchange Capacity 6. Noncompliance Notification: Manganese Potassium Percent Humic Matter Sodium pH Zinc Exchangeable Sodium Percentage Phosphorus Base Saturation (by calculation) 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 sludge digester; 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 render 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_ 4 d. Any time that self -monitoring information indicates that the facility has gone out of 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 I. Well Construction / Abandonment Criteria: a. Prior to beginning waste disposal operations, four monitoring wells, one upgradient and three down -gradient, shall be installed to monitor groundwater quality. The well(s) shall be constructed such that the water level in the well is never above or below the screened (open) portion of the well at any time during the year. The general location and name for each well is marked on Attachment A. Each monitoring well shall be located at the review boundary, but not within the review boundary, constructed in accordance with this permit, and approved by the Wilmington Regional Office. b. The wells must be constructed by either a North Carolina Certified Well Contractor, the property owner, or the property lessee according to General statutes 87-94.4(b)(2). If the construction is not performed by a certified well contractor, the property owner or lessee must physically perform the actual well construction activities, and the well(s) must be constructed according to the North Carolina Well construction Standards (15A NCAC 2C .0108) and the local county rules. c. The Wilmington Regional Office, telephone number (910) 395-3900, shall be notified at least forty-eight (48) hours prior to the construction of any monitoring well so that an inspection can be made of the monitoring well location. Such notification to the regional groundwater 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. d. Within 30 days of completion of all well construction activities, a certification must be received from a professional engineer or a Iicensed geologist certifying that the monitoring wells are located and constructed in accordance with the Well Construction Standards (15A NCAC 2C) and this permit. This certification should be submitted with copies of the Well Completion Form (GW-1) for each well. Mail this certification and the associated GW-1 forms to the Permits and Compliance Unit, Groundwater Section, 1636 Mail Service Center, Raleigh, NC, 27699-1636: 2. Sampling Criteria: a. Monitor wells MW-I, MW-2, MW-3, and MW-4 shall be sampled initially after construction and prior to waste disposal operations, and thereafter every March, July, and November for the parameterslisted below. Prior to sampling the parameters, the measurement of water levels must be made. The depth to water in each well shall be measured from the surveyed point on top of the well casing. The measuring points (top of well casing) Of all monitoring wells shall be surveyed relative to a common datum_ Water Level pH Chlorides Total Dissolved Solids (TDS) Fecal Coliform Total Phosphorous Nitrate -Nitrogen Total Ammonia - Nitrogen b. For Volatile Organic Compounds (VOCs) sampled annually in November, use only one of the following methods: (A) Standard Method 6230D, Practical Quantitation Limit (PQL) at 0.5 ug/L or less (B) Standard Method 6210D, PQL at 0.5 ug/L or less (C) EPA Method 8021, Low Concentration, PQL at 0.5 ug/L or less (D) EPA Method 8260, Low Concentration, PQL at 0.5 ug/L or less (E) Another method with prior approval by the Groundwater Section Chief Any of the referenced methods used for VOCs must at a minimum, include all the constituents listed in Table VIE of Standard Method 623013. Any method used must provided a PQL at 0.5 ug/L or less which must 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 ug/L must be qualified (estimated) and reported. c. Any laboratory selected to analyze parameters must be certified by the Division of Water Quality (DWQ) for the parameters required. 3. Reporting / Documentation: a. All reports and documentation (GW-1, GW-30, and GW-59) shall be mailed to the following address: Groundwater Section Permits and Compliance Unit 1636 Mail Service Center Raleigh N.C. 27699-1636 Updated blank forms (GW-1, GW-30, and GW-59) may be downloaded from the Groundwater section's website at http:H w.ehnr.stste.nc.us/ or requested from the address mentioned above. b. For the initial sampling of the wells the Permittee shall submit a copy of the GW-1 Form (Well Completion Form) with the Compliance Monitoring Form (GW-59) for each well to the address shown above. Initial Compliance Monitoring Forms that do not include copies of the GW-1 forth may be returned to the Permittee without being processed. Failure to submit these forms as required by this permit may result in the initiation of enforcement activities pursuant to NC General Statutes 143-215.6. c. The results of the sampling and analysis must be received on Form GW-59 (Groundwater Quality Monitoring: Compliance Report Form) by the Groundwater Section at the address listed above, on or before the last working day of the month following the sampling month. The data from all groundwater sampling analyses required by the permit conditions must be reported using the most recent GW-59 form along with attached copies of the laboratory analyses. d. Within sixty (60) days of completion of all monitoring wells, the Permittee shall submit two original copies of a scaled topographic map (scale no greater than J.": 100') signed and sealed by a professional engineer or a state licensed land surveyor that indicates all of the following information: (1) The location and identity of each monitoring well, (2) the location of the major components of the waste disposal system, (3) the location of property boundaries within 500 feet of the disposal area(s), (4) the latitude and longitude of the established horizontal control monument, (5) the elevation of the top of the well casing (which shall be known as the "measuring point") relative to a common datum, (6) the depth of water below the measuring point at the time the measuring point is established. (7) the location of the Review and Compliance Boundaries, and (8) the date the map is prepared and/or revised. Control monuments small be installed in such a manner and made of such materials that the monument will not be destroyed due to activities that may take place on the property. Maps and any supporting documents shall be sent to the Groundwater Section at the address listed above. The permittee is responsible for the geographic accuracy of any map submitted, however produced. 4. Vertical Separation Requirements: Waste application activities shall not occur when vertical separation between depth of application and the water table is less than one foot. Verification of the water table elevation can be confirmed by water level readings obtained from the monitoring well(s) near the site or auger boring(s), which must be done within 24 hours prior to the application of wastewater. Any open borings must be properly filled with native soil prior to the application of wastewater, to decrease the chance of any waste contaminating the groundwater. 5. Liner Requirements: The lagoon shall have either a liner of natural material at least one (1) foot in thickness and having a hydraulic conductivity of no greater than 1 x 104 centimeters per second when compacted, or a synthetic liner of sufficient thickness to exhibit structural integrity and an effective hydraulic conductivity no greater than the natural material liner, according to 15A NCAC 2H .0219(f). 6. Applicable Boundaries: a. 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 (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 according to 15A NCAC 2L .0106(d)(2). b. 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 remediation action in accordance with 15A NCAC 2L .106(d)(1). 7. Additional Requirements: Any additional groundwater quality monitoring, as deemed necessary by the Division, shall be provided. 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 keep an inspection log or summary including at least the date and time of inspection, observatians 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 upon request to the Division or other permitting authority. Any duly authorized officer, employee, or representative of the Division may, upon presentation of credentials, enter and inspect any property, premises or place on or related to the disposal site or facility at any reasonable time for the purpose of determining compliance with this permit; may inspect or copy any records that must be maintained under the terms and conditions of this permit, and may obtain samples of groundwater, surface water, or leachate. VI. GENERAL CONDITIONS 1. 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. 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. 5. 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 NCGO10000, and any requirements pertaining to wetlands under 15A NCAC 2B .0200 and 2H .0500. 6. A set of approved plans and specifications for the subject project must be retained by the Permittee for the life of the project. 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). 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 12`s day of September, 2002 NORTH OLINA ENVIRONMENTAL MANAGEMENT COMMISSION 'Alan W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number WQ0019907 Permit No. WQ0019907 September 12, 2002 ENGINEER'S CERTIFICATION Partial Final 1, , 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. O 01 f 1 '*7 Fiaure 4 Holly Ridge, Town of Onslow County WQ0019907 / GWO1088 Monitorinc, W-11 I NVATER POLLUTION CONTROL SYSTEM OPERATORS CERTIFICATION COMMISSION CLASSIFICATION RATING SHEET FOR WATER POLLUTION CONTROL SYSTEMS FACILITY INTORMATION: NAME OF FACILITY: I MAILING ADDRESS: COUNTY: CONTACT PERSON: TELEPHONE: 7Dk PERMIT NO: 07 Clieck One: NC WQ HEALTH DP J ORC: J �� �� TELEPHONE: 7c S i RATING INFORMATION: (Before completing this section, please refer to pages 2-4) PEPr. III �`PED FLrJ VrT: ;1 I MU D CHECK CLASSIFICATION: WASTEWATER: I COLLECTION: I SPRAY IRRIGATION SUBSURFACE PHYSICALICHEMICAL GRADE I RATED BY: BNR7 - YES NO 2 ✓ 3 4 2 3 4 LAND APPLICATION REGION: [;J r fC DATE: REGIONAL OFFICE TELEPHONE NUMBER: EXT: ff Classification of Biological Water Pollution Control Treatment Systems: Grade l Biological WPCS - Septic Lank/sand filter systems - Biological lagoon systems - Constructed wetlands wid 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 0.5 million gallons per day (mad) Grade III Biological WPCS - Systems that utilize an activated sludge or fixed growth process with a permitted flow of greater than 0.5 through 2.5 mullion gallons per day (mgd) - Grade II systems that are required to achieve biological nutrient reduction Grade IV Biological WPCS - Systems that utilizing an activated sludge or fixed growth process with a permitted flow of greater than 2.5 million gallons per day (nsgd) - Grade III systems that are required to achieve biological nutrient reduction M * Biological Nutrient Reduction - The reduction of total nitrogen or total phosphorous by an activated sludge or•fixed growth process as required by the facilities permit. Classification of Collection Water Pollution Control Systems: (whichever provides lowest grade) Sarre grade as biological water pollution control system. Grade of system: Based on population served: 1,500 or Less = Grade I 1,501 to 15,000 = Grade II 15,001 to SO,GOO = Grade III 50,001 or more = Grade IV Classification of Spra�jrri ation Water Pollution Control Systems: `/System's which utilize spray irrigation for the reuse or disposal of wasterwater. These systems include: septic tanks, sand filter, oil/water separators, lagoons, sloraEe basins, screening, sedimentation, Systems other than those listed above shall be subject to additional classification. ----------------------------------------------------------------------------------------------------------------------- Classification (if Land Application of Residuals Systems: Systems permitted and dedicated for land application of residuals that are produced by a water pollution control system or contaminated soils. Classification of Physical/Chemical Water Pollution Control Treatment Systems: Grade I Physical/Chemical: Any water pollution control system that utilizes a primarily physical process to treat wastewater. This classification includes groundwater remediation systems. ** Gracie Il PhysicaUCliemical: Any water pollution control system that utilizes a primarily chemical process to treat wastewater. This classification includes reverse osmosis, electrodialysis, and ultrafiltration systems. ** Any rater pollution control system that utilizes a phyical/chemical process to enhance an �sctirmed sludge or fixed growth process, shall not be subject to additional classification. Classification of Subsurface Water Pollution Control Systems. Systems which utilize tilt soil for subsurface treatment and disposal of wastewater and/or are required to have a certified operator under 15A NCAC 18A.1951. *** Any subsurface system that has as part of its 1reamient process a water pollution control systems that niay be classified under Rules .0302 through .0307 of this section shall be subject 10 addional class f cation. Definitions Activated Sludge - shall mean a biological wastewater treatment process in which predoininantly biodegradable polluntants in wastewater are absorbed, or adsorbed by living aerobic organisms and bacteria. Chemical Process - shall mean a wastewater pollution coi3trol 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 system. Electrodialysis System - shall mean a system utlizing a selective separation of dissolved solids process that is based on electrical charge and diffusion through a semipermeable membrane. Physical Process - shall mean any water pollution control system process consisting of electrodialysis, adsorption, absorption, air stripping, gravimetric sedimentation, floation, and filtration as a means of treatment. Reverse Osiinosis System - shall mean a system which utilizes solutions and semiperrnable membranes to separate and treat wastewater. Ultrafiltration System - shall mean a system which utilizes a membrane filter to remove pollutants from wastewater. Or 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. 9OA-37. Note: Please refer to G.S. 90A-37 for additional information and definitions.