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HomeMy WebLinkAboutWQ0015053_Final Permit_20050211F WATF �� RQ Michael F. Easley, Governor William G. Moss Jr., Secretary r North Carolina Department of Environment and Natural Resources 01 C .Alan W. Klimek, P.E., Director Division of Water Quality February 11, 2005 GIL FALASCO, COUNTY ENGINEER CURRITUCK COUNTY P.O. BOX 38 CURRITUCK, NC 27929 Subject: Permit No. WQ0015053 (Modification) Moyock Commons Shopping Center and Currituck Commercial Center Wastewater Treatment and Low Rate Infiltration System Currituck County Dear Mr. Falasco: In accordance with your permit application request for modification received January 6, 2005, and delegation of signing authority letter received via fax February 10, 2005, we are forwarding herewith Permit No. WQ0015053, dated February 11, 2005, to Currituck County for the continued operation of the subject wastewater treatment system and low -rate infiltration wastewater disposal facilities. This permit approves the request to remove references to restaurant seating capacities and allocations. ' This permit shall be effective from the date of issuance until July 31, 2008, shall void Permit No. WQ0015053 issued August 15, 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. 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. If you need additional information concerning this matter, please coroact Toni Wyche at (919) 715-6188. 774v-, W. Klimek, P.E. cc: Currituck County Health Department Washington Regional Office, Aquifer Protection Section Technical Assistance and Certification Unit APS Central Files —Parker Lincoln (WQ0015053) LAU Files Noee Carolina Nra!!y Aquifer Protection Section 1636 Mail Service Center Raleigh, NC 27699-1636 Phone (919) 733-3221 Customer Service Internet: http,.//h2o.enr.state.ne.us 2728 Capital Boulevard Raleigh, NC 27604 Fax (919) 715-0588 1-877-623-6748 Fax (919) 715-6048 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES RALEIGH LOW RATE WASTEWATER INNFILTRATION 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 40,000-GPD wastewater collection, treatment and low rate infiltration disposal system.. The wastewater collection system shall consist of approximately 2,625 linear feet of 8-inch gravity sewer and an 80-GPM pump station with dual pumps, high water alarms, and approximately 815 linear feet of 4-inch force main. The 40,000-GPD extended aeration wastewater treatment plant shall consist of a continuous monitoring flow recorder, a 10,000-gallon equalization basin with two 29-GPM pumps, a manually cleaned bar screen, flow splitter box, two 20,029-gallon coarse bubble aeration basins, two 8,390-gallon clarifiers, a 3,938-gallon aerated sludge holding tank, two 206-CFM blowers, dual bed tertiary filters (each filter measuring fourteen square feet), a tablet chlorinator with an 1,111-gallon chlorine contact chamber, a 2,500-gallon effluent dosing tank with two 90- GPM pumps and high water alarms, and a stand-by generator with automatic transfer switch to serve the WWTP and collection system pump station. The low -rate wastewater disposal system shall consist of two 27,500-square-foot infiltration basins, which are fed by constructed wetlands for nitrogen removal. The wastewater collection, treatment and low rate infiltration disposal system will serve the Moyock Commons Shopping Center and Currituck Commercial Center with no discharge of wastes to the surface waters, pursuant to the application received March 18, 2003, 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 July 31, 2008, shall void Permit No. WQ0015053 issued August 15, 2003, and shall be subject to the following specified conditions and limitations: 1. PERFORMANCE STANDARDS 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. 2. 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 operate 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. 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. 4. Adequate measures shall be taken to divert stormwater from the infiltration areas and to prevent wastewater runoff. Diversion or bypassing of the untreated wastewater from the treatment facilities is prohibited. 6. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to surface or ground waters resulting from the operation of this facility. 7. The following buffers shall be maintained: a) 200 feet between the infiltration basin and any habitable residence or places of public assembly under separate ownership, b) 100 feet between the infiltration basin and any private or public water supply source and any streams classified as WS or B, c) 100 feet from mean high water between the infiltration basin and any "SA" or "SB" classified surface waters, d) 100 feet from normal high water between the infiltration basin and any other stream, canal, marsh or coastal waters, e) 100 feet from normal high water between the infiltration basin and any Class I or Class 11 impounded reservoir used as a source of drinking water, f) 100 feet between the infiltration basin and any other lake or impoundment, g) 50 feet between the infiltration basin and any drainage systems (ditches, drains, surface water diversions, etc.) and from any groundwater lowering and surface drainage ditches, h) 50 feet between the infiltration basin and property lines, i) 50 feet between treatment units and property lines, and j) 50 feet between high rate infiltration unit and other treatment units and public right of ways. S. 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. PA II. OPERATION AND MAINTENANCE REQUIREMENTS 1. The facilities shall be properly maintained and operated at all times. 2. Upon classification of the wastewater treatment and 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. 3. The application rate for the infiltration system shall not exceed 1.25 GPD per square foot. 4. 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. 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 screenings removed from the wastewater treatment plant shall be properly disposed in a sanitary landfill or by other means that have been approved by this Division. 7. a. A vegetative cover crop must be maintained in the wetland cells at ail times. At any point during operation these cells lack a vegetative crop, one shall be immediately reestablished. b. Vegetative growth must be kept out of the infiltration basins areas at all times. All vegetation must be removed manually so that minimal disturbance will occur to the disposal area, 8. The application of chemicals to the distribution field(s) is expressly prohibited. 9. 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. 10. Diffusers shall be cleaned as needed to ensure that adequate aeration is provided. Records of this maintenance shall be maintained by the Permittee. 11. 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. 12. If nitrogen levels in the drainage ditches contributes to water quality stream standards contraventions, additional denitrification units may be required. 13. No type of wastewater other than that from the Moyock Commons Shopping Center and Currituck Commercial Center shall be disposed in the infiltration basins. 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 protection will be established and an acceptable sampling reporting schedule shall be followed. 2. 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 Iess 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 3. As an indicator of proper operation and :maintenance, the facility shall produce an effluent in compliance with the following limitations: a Parameter Monthly Avera g Flow 40,000 GPD BODS (5-day, 20°C) 15 mg/1 NH N 4 mg/1 TSS 30 mg/l Fecal Coliform b 200 per 100 ml 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. 4 The effluent from the subject facilities shall be monitored, by the Permittee, at the point prior to irrigation for the following parameters: Parameter SgMlina Point Sampling FrequMey T e of Sate le l 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 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 Total Phosphorus Efflluent "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 April, August, and November. *** Sample location maybe prior to the wetland cell. 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. 4. 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. 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. 5. A record shall be maintained of all residuals removed from this facility. The record shall include the name of the hauler, the permit authorizing disposal or a letter from a municipality agreeing to accept the residuals, the date the residuals were hauled, and the volume of residuals removed. 6. The adjacent drainage ditches shall be sampled at points DD-1 and DD-2 every April, August, and November for the following parameters: Total Ammonia (NH3 as N) Dissolved Oxygen Total Nitrogen Total Phosphorus 5 7. Three (3) copies of all monitoring data (as specified in condition 1112 and 1113) on Form NDMR-1 and three (3) copies of all operation and disposal records (as specified in condition 1114, and 1115) on Form NDAR-1 shall be submitted monthly on or before the last day of the following month. All information shall be submitted to the following address: Aquifer Protection Section Information Processing Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 8. A representative annual 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 Exchangeable Sodium Percentage Phosphorus Cation Exchange Capacity Base Saturation (by calculation) 9. 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. 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. d. Any time that self -monitoring information indicates that the facility has gone out of compliance with its permit limitations. Occurrences outside normal business hours may also 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. IV. GROUNDWATER REQUIREMENTS 1. Well Construction / Abandonment Criteria: a. Within sixty (60) days of permit issuance, groundwater samples shall be taken from the top of the surficial aquifer adjacent to each of the three wells (MW-1, MW-2, and MW-3) and analyzed for the parameters listed (Section 2.a.) for comparison with samples taken form the wells. If the most recent sampling results from the three monitoring wells differ significantly from those collected from the shallow aquifer adjacent to the wells, three replacement monitor weIl(s), MW-4, MW-5, and MW-6, shall be constructed adjacent to the existing monitor wells MW-1, MW-2, and MW-3 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 Figure 1. Each monitoring well shall be located at the Review boundary, constructed in accordance with this permit, and approved by the Washington Regional Office. b. The well(s) must be constructed by either a North Carolina Certified Well Contractor, the property owner, or the property lessee according to General Statutes 87-98.4(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. If monitoring wells MW-4, MW-5, and MW-6 are constructed, within sixty (60) days of well construction, existing monitor well(s) MW-1, MW-2, and MW-3 shall be permanently abandoned. Within thirty (30) days of abandonment, a Well Abandonment Record (GW-30 form) shall be completed for each well abandoned and mailed to the address listed in the "Reporting / Documentation" section of the groundwater Requirements. The well(s) must be abandoned by either a North Carolina Certified Well Contractor, the property owner, or the property lessee according to General Statutes 87-98.4(b)(2)_ If the abandonment 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. d. The Washington Regional Office, telephone number (252) 946-6481, 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. e. Within thirty (30) days of completion of all well construction activities, a certification must be received from a professional engineer or a licensed geologist certifying that the monitoring wells are located and constructed in accordance with this permit. 7 2. Sampling Criteria: a. Monitor wells MW-1, MW-2, and MW-3 (or, alternatively, MW-4, MW-5, and MW-6) ) shaIl be sampled initially after construction (if applicable) and every April, August, and November for the parameters listed below. Prior to sampling the parameters, the measurement of water levels must be taken. The depth to water in each well shall be measured from the surveyed point on the top of the casing. The measuring points (top of well casing) of all monitoring wells shall be surveyed relative to a common datum. Water Level pH Chloride Total Dissolved Solids (TDS) Fecal Coliforms Total Organic Carbon (TOC) Nitrate (NO3-N) Total Ammonia (as N) Total Phosphorous Sulfate b. For Total Organic Carbon (TOC), if concentrations greater than 10 mg/l are detected in any down -gradient 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 down -gradient wells shall be subject to the additional sampling and analysis as described above. c. Any laboratory selected to analyze parameters must be Division of Water Quality (DWQ) certified for those parameters required. 3. Reporting / Documentation: a. All reports and documentation (GW-1, GW-30, GW-59) shall be mailed to the following address: Aquifer Protection Section Information ProcessingUnit 1617 Mail Service Center Raleigh., NC 27699-1617 Updated blank forms (GW-1, GW-30, GW-59) may be downloaded from the Groundwater Section's website at http://gw_ehnr.state.ne.us/ or requested from the address listed above. b. For the initial sampling of the well(s), 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 listed in the "Reporting / Documentation" section of the Groundwater Requirements. Initial Compliance Monitoring Forms that do not include copies of the GW-1 form will 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 (address listed in the "Reporting / Documentation" section of the Groundwater Requirements), on or before the last working day of the month following the sampling month. The data of 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 new monitoring well(s), the Permittee shall submit two original copies of a scaled site map (scale no greater than P:100'); however, special provisions may be granted upon prior approval for larger properties. The map(s) must include the following information: 1) the location and identity of each monitoring well, 2) the location of major components of the waste disposal system, 3) the location of all 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 Review and Compliance boundaries, and 8) the date the map is prepared and/or revised. Control monuments shall be installed in such a manner and made of such nnaterials that the monument will not be destroyed due to activities that may take place on the property. Maps and any supporting documentation shall be sent to the Groundwater Section as addressed in the "Reporting / Documentation" section above. The Permittee is responsible for the geographic accuracy of any map submitted, however produced. 4. 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 is for the disposal system constructed after December 30, 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 remediation action according to 15A MCAC 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 action in accordance with 15A NCAC 2L .0106(d)(1). 5. Additional Requirements: a. If not abandoned, within sixty (60) days of permit issuance, monitor wells MW-1, MW-2, and MW-3 shall be equipped with identification tags. b. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall be provided. V. INSPECTIONS 1. Adequate inspection, maintenance, and cleaning shall be provided by the Permittee to insure proper operation of the subject facilities. 9 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 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 This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 2. This permit is effective only with respect to the nature and volume of wastes described in the application and other supporting data. 3. 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. 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. T 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. 9. 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. Permit issued this the i Vh day of February, 2005 NORTH C OLINA ENYIRONMENTAL MANAGEMENT COMMISSION Alan W. 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