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HomeMy WebLinkAboutWQ0000550_Final Permit_200801310� 11Vn{ RQ� Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Coleen H. Sullins, Director Division of Water Quality January 31, 2008 DANIEL F. SCANLON,11, CURRITUCK COUNTY MANAGER CLIRRITUCK COUNTY PO BOX 3 8 CURRITUCK, NC 27929 Subject: Permit No. WQ0000550 Currituck County Detention Center Wastewater Surface Irrigation Currituck County Dear Mr. Scanlon: In accordance with your permit renewal request received November 20, 2007, we are forwarding herewith Permit No. WQ0000550, dated January 31, 2008, to Currituck County for the continued operation of the subject wastewater treatment and surface irrigation facilities. This permit shall be effective from the date of issuance until December 31, 2012, shall void Permit No. WQ0000550 issued March 20, 2003, and shall be subject to the conditions and limitations as specified therein. Please pay particular attention to the monitoring requirements in this permit. Failure to establish an adequate system for collecting and maintaining the required operational information will result in future compliance problems. Please note that on September 1, 2006 State Administrative Code ISA NCAC Subchapter 02T — Waste not Discharged to Surface Water was adopted. This permit incorporates the requirement of the new rules, which include new setback requirements. Remember to take the time to review this permit thoroughly, as some of the conditions contained therein may have been added, changed, or deleted from those in previously issued permits. 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 trust 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. If you need additional information concerning this matter, please contact David Goodrich at (919) 715-6162 or david.goodrich@ncmail.net. Sincerely, 4�lf 4 /-, or Coleen . Sullins cc: Currituck County Health Department Washington Regional Office, Aquifer Protection Section Technical Assistance and Certification Unit Erick Weatherly, Currituck County, PO Box 38, Currituck, NC 27929 APS Central Files LAU Files Nope Carolina Naturally Aquifer Protection Section 1636 Mail Service Center Raleigh, NC 27699-1636 Telephone : (919) 733-3221 Internet: www.ncwatcrguaiity.org Location: 2728 Capital Boulevard Raleigh, NC 27604 Fax 1: (919) 715-0588 Fax 2: (919) 715-6048 An Equal Opportunity/Affirmative Action Employer— 50% Recycled/ 10% Post Consumer Paper Customer Service: (877) 623-6748 _i NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES RALEIGH SURFACE 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 Currituck County Currituck County FOR THE continued operation of a 25,000 GPD spray irrigation treatment and disposal facility consisting of an influent bar screen, a 45 GPM pump station with duplex pumps, high water alarms, and approximately 810 linear feet of 3 -inch force main, a 1.5 million gallon treatment and storage lagoon, hypochlorination, a 9,393 gallon chlorine contact tank with turbine pumps, a 20 HP irrigation pump, and three (3) spray irrigation fields (designated as Field Number I having 2.3 acres, Field Number 2 having 2.3 acres and Field Number 3 having 2.3 acres) to serve FACILITY, with no discharge of wastes to the surface waters, pursuant to the application received November 20, 2007, 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 December 31, 2012, shall void Permit No. WQ0000550 issued March 20, 2003, and shall be subject to the following specified conditions and limitations: I. SCHEDULES 1. Within sixty (60) days of permit issuance, the permittee shall submit two original copies of a scaled site map (scale no greater than 1"=100'); however, special provisions may be granted upon prior approval for large properties. The map(s) must include the following information: a. The location -and identity of each monitoring well. b. The location of major components of the waste disposal system. c. The location of property boundaries within 500 feet of the disposal area(s). d. The latitude and longitude of the established horizontal control monument. e. The elevation of the top of the well casing (which shall be known as the "measuring point") relative to a common datum. f. The depth of water below the measuring point at the time the measuring point is established. g. The location of review and compliance boundaries. WQ0000550 Version 3.0 Shell Version 070531 Page 1 of 7 h. The date the map is prepared and/or revised. Control monuments shall 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. The maps and any supporting documentation shall be sent to the N.C. Division of Water Quality, Aquifer Protection Section, 1636 Mail Service Center, Raleigh, N.C. 27699-1636. The permittee is responsible for the geographic accuracy of any map submitted, however produced. 2. No later than six (6) months prior to the expiration of this permit, the Permittee shall request renewal of this permit on official Division form(s). Upon receipt of the request, the Division 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. Please note that Rule 15A NCAC 02T .0105(d) requires an updated site map to be submitted with the permit renewal application. II. PERFORMANCE STANDARDS The surface irrigation facilities shall be effectively maintained and operated at all tunes so that there is no discharge to the surface waters, nor any contravention of groundwater or surface water standards. In the event that the facilities fail to perforin 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, such as the construction of additional or replacement wastewater treatment and disposal facilities. 2. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to ground or surface waters resulting from the operation of this facility. 3. Effluent limitations shall not exceed those specified in Attachment A. 4. Application rate(s), whether hydraulic, nutrient, or other pollutant shall not exceed those specified in Attachment B. 5. The compliance boundary for the disposal system is specified by rules in 15A NCAC 02L, Groundwater Classifications and Standards. This disposal system was individually permitted on or after December 30, 1983; therefore, the compliance boundary 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 standards at or beyond the compliance boundary is subject to remediation action according to 15A NCAC 02L .0106(d)(2) as well as enforcement actions in accordance with North Carolina General Statute 143-215.6A through 143-215.60. The Permittee shall apply for a permit modification prior to any sale or transfer of property that affects a compliance boundary to establish a new compliance boundary. 7. In accordance with 15A NCAC 02L .0107(d), no wells, other than monitoring wells, shall be constructed within the compliance boundary except as provided by 15A NCAC 02L .0107(g). 8. 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 02L .0106. 9. The facilities permitted herein must be constructed according to the following setbacks: a. The setbacks for Irrigation sites shall be as follows (all distances in feet): i. Any habitable residence or place of public assembly under separate ownership; 400 ii. Any habitable residence or place of public assembly owned by the permittee: 200 WQ0000550 Version 3.0 Shell Version 070531 Page 2 of 7 iii. Any private or public water supply source: 100 iv. Drainage ways or surface water bodies: 100 v. Groundwater lowering ditches: 100 vi. Surface water diversions: 25 vii. Any well with exception of monitoring wells: 100 viii.Any property line: 150 ix. Top of slope of embankments or cuts of two feet or more in vertical height: 15 x. Any water line from a disposal system: 10 xi. Subsurface groundwater lowering drainage systems: 100 xii. Any swimming pool: 100 xiii.Public right of way: 50 xiv. Nitrification field: 20 xv. Any building foundation or basement: 15 b. The setbacks for Treatment and storage units shall be as follows (all distances in feet): i. Any habitable residence or place of public assembly under separate ownership: 100 ii. Any private or public water supply source: 100 iii. Surface waters: 50 iv. Any well with exception of monitoring wells: 100 v. Any property line: 50 IIT. OPERATION AND MAINTENANCE RE UIREMENTS 1. The facilities shall be properly maintained and operated at all times. 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. The Permittee shall maintain an Operation and Maintenance Plan pursuant to 15A NCAC 02T .0507 including operational functions, maintenance schedules, safety measures, and a spill response plan. 2. Upon classification of the wastewater treatment and irrigation facilities by the Water Pollution Control System Operators Certification Commission (WPCSOCQ, 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 08G .0200. The ORC shall visit the facilities in accordance with 15A NCAC 08G .0200 or as specified in this permit and shall comply with all other conditions specified in these rules. 3. A suitable year round vegetative cover shall be maintained such that crop health is optimized, allows for even distribution of effluent, and allows inspection of the irrigation system. 4. Adequate measures shall be taken to prevent wastewater ponding or runoff from the irrigation field. 5. Irrigation shall not be performed during inclement weather or when the ground is in a condition that will cause ponding or runoff. 6. All waste application equipment must be tested and calibrated at least once per year. Records of the calibration must be maintained for five years. 7. No type of wastewater other than that from the Currituck County Detention Center shall be irrigated onto the irrigation area. WQ0000550 Version 3.0 Shell Version 070531 Page 3 of 7 S. An automatically activated standby power source shall be on site and operational at all times capabli of powering all essential treatment units, If a generator is employed as an alternate power supply, it shall be tested weekly by interrupting the primary power source. 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. The residuals generated from these treatment facilities must be disposed / utilized in accordance with 15A NCAC 02T .1100. The Permittee shall maintain a residual management plan pursuant to 15A NCAC 02T.0508. 12. Diversion or bypassing of the untreated wastewater from the treatment facilities is prohibited. 13. Freeboard in the treatment and storage lagoon shall not be less than two feet at any time. 14. A waste -level gauge, to monitor waste levels in the storage pond, shall be provided, 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 the lowest point on top of the darn elevations. Caution must be taken not to damage the integrity of the liner when installing the gauge. 15. A protective vegetative cover shall be established and maintained on all earthen basin embankments (outside toe of embankment to maximum allowable temporary storage elevation on the inside of the embankment), 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. W. MONITORING AND REPORTING REQUIREMENTS 1. Any monitoring (including groundwater, surface water, soil or plant tissue analyses) deemed necessary by the Division to ensure surface and ground water protection will be established and an acceptable sampling reporting schedule shall be followed. 2. All laboratory analyses for effluent, ground waters, or surface waters shall be made by a laboratory certified by the Division for the required parameter(s) under 15A NCAC 02H.0800. 3. Flow through the treatment facility shall be continuously monitored and daily flow values shall be reported on Form NDMR. The Permittee shall install and maintain an appropriate flow measurement device consistent with approved engineering and scientific practices to ensure the accuracy and reliability of 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. The Permittee shall keep records of flow measurement device calibration on file 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, and c. Percent from true flow. 4. The effluent from the subject facilities shall be monitored by the Permittee at the frequencies and location(s) for the parameter(s) specified in Attachment A. WQ0000550 Version 3.0 Shell Version 070531 Page 4 of 7 5. The Permittee tracking the amount of wastewater disposed shall maintain adequate records. 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. Continuous monthly and year-to-date loadings for any non -hydraulic parameter specifically limited in Attachment B for each field, g. Weather conditions, and h. Maintenance of cover crops. 6. Freeboard (waste level to the lowest elevation on the top of the embankment) in the treatment and storage lagoon shall be recorded weekly. 7. Monitor wells shall be sampled at the frequencies and for the parameters specified in Attachment C. All ingpping, well construction forms well abandonment forms and monitoring data shall refer to the permit number and the well nomenclature as provided in Attachment C and FigjLre 2. Two (2) copies of the results of the sampling and analysis must be received on Form GW -59 (Groundwater Quality Monitoring: Compliance Report Foran), along with attached copies of laboratory analyses, by the Division of Water Quality, Information Processing Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 on or before the last working day of the month following the sampling month. Form GW -59 shall include the number of this permit and the appropriate well identification number. One Form GW -59a certification form shall be provided for each set of sampling results submitted. 9. Three (3) copies of all monitoring data [as specified in Conditions IV. 3, and IV. 4.] on Form NDMR for each PPI and three (3) copies of all operation and disposal records [as specified in Conditions IV. 5, and IV. 6.] on Form NDAR-1 for every field shall be submitted on or before the last day of the following month. If no activities occurred during the monitoring month, monitoring reports are still required documenting the absence of the activity. All information shall be submitted to the following address: Division of Water Quality Information Processing Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 10. An annual representative soils analysis (Standard Soil Fertility Analysis) shall be conducted on each irrigation 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 Manganese Potassium Calcium Percent Humic Matter Sodium Copper PH Zinc Magnesium Base Saturation (by calculation) Phosphorus Cation Exchange Capacity Exchangeable Sodium Percentage WQ0000550 Version 3.0 Shell Version 070531 Page 5 of 7 11. 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 sludge digester; the known passage of a slug of hazardous substance through the facility; or any other unusual circumstances including ponding in the irrigation field or runoff from the irrigation fields. 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 disposal system resulting in a by-pass directly to receiving waters. d. Any time that self-monitoring information indicates that the facility has gone out of compliance with its permit limitations including, but not limited to, freeboard measurements, effluent limitations, exceedances of groundwater standards, or overloading of any field. For any emergency that requires immediate reporting (e.g., discharges to surface waters, imminent failure of a storage structure, etc.) outside normal business hours must be reported to the Division's Emergency Response personnel at telephone number (800) 662-7956, (800) 858-0368, or (919) 733- 3300. 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. V. INSPECTIONS 1. Adequate inspection and maintenance shall be provided by the Permittee to ensure 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, 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 five years from the date of the inspection and shall be made available upon request to the Division or other permitting authority, 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 I. 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. 2. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. WQ0000550 Version 3.0 Shell Version 070531 Page 6 of 7 �. This permit is effective only with respect to the nature and volume of wastes described in the application and other supporting data. No variances to applicable rules governing the construction and / or operation of the permitted facilities are granted unless specifically requested and granted in this permit. 4. 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) that have jurisdiction. Of particular concern to the Division are applicable river buffer rules in 15A NCAC 02B .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 02B .0200 and 02H .0500. 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 on official Division form(s), 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. The Permittee of record shall remain fully responsible for compliance until a permit is issued to the new owner. 6. The Permittee shall retain a set of approved plans and specifications for the life of the facilities permitted herein. 7. The Permittee shall maintain this permit until all permitted facilities herein are properly closed or permitted under another permit issued by the appropriate permitting authority. 8. The Permittee must pay the annual fee within Failure to pay the fee accordingly may cause pursuant to 15A NCAC 02T .0105(e). thirty (30) days after being billed by the Division. he Division to initiate action to revoke this permit Permit issued this the 31st of January, 2008 NORTH C LINA ENV NTA MANAGEMENT COMMISSION for Coleen H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number WQ0000550 WQ0000550 Version 3.0 Shell Version 070531 Page 7 of 7 ATTACHMENT A - EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS CURRITUCK COUNTY CURRITUCK COUNTY DETENTION CENTER 001 WWTF Influent Permit Number: WQ0000550 Version 3.0 EFFLUENT GIARl1CTRJSTI4S EFFLUENT LIMITS MONITQRI111 REQfIRMiwSITS Mg7ISI1TC7E IItG REQU1RElsAf= f3S Parameter Description - PCS Code Monthly Average Units Weekly Units Daily Maximum Units Average Measurement Frequency Sample Type Coliform, Fecal MF, M -FC Broth,44.5C - 31616 4 X year Measurement Sample Parameter Description -PCS Code Monthly Average Units Weekly Units Daily Maximum Units Frequency Type 3 X year Grab pH - 0040D 6.0 - 9.0 s.u. Averaa Grab Solids, Total Dissolved- 180 Deg.0 - 70300 3 X year Grab BOD, 5 -Day (20 Deg. C) - 00310 Flow, in cmduil or thru treatment plant - 50050 25,000 god I Grab Solids, Total Suspended - 00530 4 X year I Continuous Recorder 002 VWVTF Effluent from Chlorine Contact EFFLUPNT- C. HA,RACT_EMSTICS EFFLUENT LIMITS Mg7ISI1TC7E IItG REQU1RElsAf= f3S Parameter Description - PCS Code Monthly Average Units Weekly Units Daily Maximum Units Average Measurement Frequency Sample Type Coliform, Fecal MF, M -FC Broth,44.5C - 31616 4 X year Grab Nitrogen, Kjeldahl, Total (as N) - 00625 4 X year Grab Nitrogen, Nitrate Total (as N) - 00620 4 X year Grab Chlorine, Total Residual - 50060 Once per discharge Grab Chloride (as CI) - 00940 1 3 X year Grab pH - 0040D 6.0 - 9.0 s.u. Weekly Grab Solids, Total Dissolved- 180 Deg.0 - 70300 3 X year Grab BOD, 5 -Day (20 Deg. C) - 00310 4 X year Grab Nitrogen, Ammonia Total (as N) - 00610 4 X year Grab Solids, Total Suspended - 00530 4 X year Grab Triannual (3 X year) sampling shall be every March, July, and November Quarterly (4 X year) sampling shall be every February, May, August, and November There shall be no discharge of Waling solids or visible foam in other than trace amounls. WQ0000550 Version 3.0 Attachment A Page 1 of I ATTACHMENT B -Approved Land Application Sites Permit Number: W00000550 Version: 3.0 Currituck County purr€tuck County Detention Center Net Field Owner Lessee County Latitude Longitude Acreage Dominant Soil Series Parameter Hourly Avg Yearly Max 01 Cuxrituck County Detention Center Currituck 36°23'54" 76'01'26" 2.30 Dragston loamy fine sand 01284 -Application Surface Irrigation 0.4 inches 52 inches 02 Cimituck County Detention Center Currituck 36023'55" 76°01`27" 2.30 Dragston loamy fine sand 01284 -Application Surface Irrigation 0.4 inches 52 inches 03 Cunituck County Detention Center Currituck 36°23'57" 76°01'27" 2.30 Dragston loamy fine sand 01284 - Application Surface Irrigation 0.4 inches 52 inches Total 6.90 WQ0000550 Version 3.0 Attachment B Page 1 of 1 ATTACHMENT C - GROUNDWATER MONITORING AND LIMITATIONS Permit Number: WQ0000550 Version 3.0 CURRITUCK COUNTY CURRITUCK COUNTY DETENTION CENTER Monitor wells MW -7 MW -2 MW -3 and MW4 CHARACTERI=OS LIMITS Mr)Ii1tTQEiIls1G SITS Parameter Descriptfon - PCs Code belly Minimum Daily Maximum Units Frequency Sample Type Footnotes Water level, dislance from measuring point - 82546 3Xyear Calculated a, b, c, g pH - 00400 6.50 8.50 su 3 X year Grab a, g Coliform, Fecal MF, M -FC Broth,44.5C - 31616 3 X year Grab 819 Solids, Total Dissolved -180 Deg.0 - 70300 500.00 mg/1 3 X year Grab a, g Carbon, Tot Organic (TOC) - 0068C 3 X year Grab a, f, g Chloride (as Cl) - 00940 250,00 mgll 3 X year Grab a,!? Nitrogen, Ammonia Total (as N) - 00610 3 X year Grab a, g Nitrogen, Nitrate Total (as N) - 00620 10.00 mg/1 3 X year Grab a, g Valatile Compounds, (GClMS) - 78732 i Annually Grab a, e, g a. 3 X year monitoring shall be conducted in March, July & November; Annual monitoring shall be conducted every November. b. The measurement of water levels shall be made prior to purging the wells. The depth to water in each well shall be measured from the surveyed point on the top of the casing. The measurement of pH shall be made after purging and prior to sampling for the remaining parameters. C, The measuring points (top of well casing) of all monitoring wells shall be surveyed to provide the relative elevation of the measuring point for each monitoring well. The measuring points (top of casing) of all monitoring wells shall be surveyed relative to a common datum d. 'Volatile Organic Compounds ('TOC) - In November only, analyze by one of the following methods: 1, Standard Method 6230D, PQL at 0.5 pg/L or less 2. Standard Method 62101), PQL at 0.5 Vg/L br less 3. EPA Method 8021, Low Concentration, PQL at 0.5 µg/L or less 4. EPA Method 8260, Low Concentration, PQL at 0.5 µg/L or less 5. Another method with prior approval by the Aquifer Protection Section Chief Any method used must meet the following qualifications: a, A laboratory must be DWQ certified to run any method used. b. The method used must, at a minimum, include all the constituents listed in Table V111 of Standard Method 62301). C. The method used must provide a PQL of 0.5 gg/L or less that 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 of 0.5 gg/L must be qualified (estimated) and reported. e. If any volatile organic compounds (VOC) are detected as a result of monitoring as provided in Attachment C, then the Washington Regional Office Aquifer Protection Supervisor, telephone number (252) 946-6481, must be contacted immediately for further instructions regarding any additional follow-up analyses required, f If TOC concentrations greater than 10 mg/l are detected in any downgradient monitoring well, additional sampling and analysis must 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. g. 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