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Home My WebLink About4002_GreeneCDLF_LFG_MonitoringPlan_DIN27228_20170717DIN 28228 Approved by SWS - July 17, 2017 Greene County Landfill Permit 4002-CDLF-1997 (active) Permit 4002-MSWLF-1982 (inactive/closed) 1 TABLE OF CONTENTS 1 INTRODUCTION 2 1.1 BACKGROUND ................................................................................................................................... 2 1.2 SITE GEOLOGY AND HYDROGEOLOGY ...................................................................................... 2 1.3 REGULATORY LIMITS ..................................................................................................................... 3 2 LANDFILL GAS MONITORING 3 2.1 LANDFILL GAS PROBES .................................................................................................................. 3 2.1.1 LANDFILL GAS PROBE LOCATIONS .................................................................................. 3 2.1.2 LANDFILL GAS PROBE CONSTRUCTION SPECIFICATIONS .......................................... 4 2.2 STRUCTURE MONITORING ............................................................................................................. 4 2.3 LANDFILL GAS MONITORING FREQUENCY ............................................................................... 4 3 LANDFILL GAS SAMPLING PROCEDURE 4 3.1 EQUIPMENT ........................................................................................................................................ 4 3.2 MONITORING PROCEDURE ........................................................................................................... 5 4 RECORD KEEPING AND REPORTING 5 4.1 MONITORING DATA FORM ............................................................................................................. 5 4.2 MONITORING REPORTS ................................................................................................................... 5 4.3 PERMANENT RECROD KEEPING ................................................................................................... 5 5 CONTINGENCY PLAN 6 6 CERTIFICATION OF PROFESSIONAL GEOLOGIST OR PROFESSIONAL ENGINEER 6 TABLE LFG MOINTORING LOCATION DETAILS ……………………………………….….........................Table 1 SHEETS POTENTIOMETRIC MAP OF UPPERMOST AQUIFER ………………………………......................Sheet 1 LANDFILL GAS MONITORING LOCATIONS ……………………………………..............…..........Sheet 2 FIGURE STOP COCK VALVE DETAILS.......................... ……………………………………..............….........Figure 1 APPENDIX SWS LANDFILL GAS MONITORING (NOVEMBER 2010)…………………………………..…Appendix A LANDFILL GAS MONITORING DATA FORM (EXAMPLE)…………………………………... Appendix B 2 1 INTRODUCTION 1.1 BACKGROUND North Carolina Solid Waste Management Rules 15A NCAC 13B require quarterly monitoring of methane gas (at MSW landfills) and quarterly monitoring of methane and other explosive landfill gases (LFG) (at C&D and other landfills) to ensure that methane does not exceed the lower explosive limit (LEL) in the soil at the facility property boundary or 25 percent of the lower explosive limit within facility structures. If the concentration exceeds the specified limits, steps must be taken to ensure the protection of public health and a remediation plan must be implemented immediately. A LFG monitoring plan is necessary to ensure that these performance standards are met. LFG monitoring has consistently been performed at this facility on a quarterly basis since at least 1993 in compliance with Rule .1626 (4)(b). A passive LFG venting system with one vent near the center of the active CDLF piggybacked over an unlined landfill, which likely decreases the amount of methane migration. This Landfill Gas Monitoring Plan’s objective is to provide clear guidelines and procedures for field personnel when performing explosive gas monitoring. This plan applies to the entire Greene County Solid Waste Facility located in Walstonburg, NC consists of a CDLF over MSW operating under permit 40-02. Facility conditions or unforeseen sampling variables may warrant deviation from standard procedures in which case alternative sampling procedures will conform to the most current NC Solid Waste Section guidelines and industry Standards. This LFG monitoring plan generally complies with the current version of the NC Solid Waste Section Landfill Gas Monitoring Guidance referenced henceforth as the SWS Guidance Document. 1.2 SITE GEOLOGY AND HYDROGEOLOGY Greene County C&D Landfill is located in the North Carolina Coastal Plain at an elevation of approximately 135 ft above sea level. Topographic relief is accentuated by the shape of the landfill and is approximated to be about 30 ft between the top of the landfill and the water-filled ditch which runs along the northeast side of the property. The direction of surface water runoff and groundwater flow is generally to the east toward a tributary of Sandy Run, located approximately 3700 ft from the landfill. The waters of Sandy Run flow southeasterly into Little Contentnea Creek and eventually discharge into the Neuse River. Based on the 1985 Geologic Map of North Carolina, the site is underlain by the Yorktown Formation described as “fossiliferous clay with varying amounts of fine-grained sand and bluish shell material which is commonly concentrated in lenses.” A review of logs from on-site water monitoring wells indicate the shallow geology consists of interbedded sandy and silty clay to a depth of 30 ft or more. These sediments, which 3 form the surficial unconfined aquifer, were reported to vary in color from red to orange to brown to gray, with frequent mottling, and to be saturated at depths from 5 to 20 ft below land surface (bls). Bedrock or clay confining features will not influence LFG migration at his site since they are beneath the water table which serves as the lower LFG confining feature. The uppermost aquifer across the entire site has been identified to be within the unconsolidated regolith. The vertical LFG migration potential extent is the shallow water table which ranges from approximately 1 to 14 feet below ground. A potentiometric map of the uppermost aquifer from groundwater elevations recorded on September 7, 2016 is shown on Sheet 1. 1.3 REGULATORY LIMITS In accordance with Rule 15A NCAC 13B LFG readings will be recorded quarterly and results will be kept in the facility operating records. Greene County will follow all operational requirements for MSWLF facilities; ensuring the measured concentrations of methane gas does not exceed the lower explosive limit (100% LEL or 5% by volume) at the facility boundary and (25% LEL or 1.25% by volume) in structures. Hydrogen sulfide gas should not exceed the lower explosive limit (100% LEL or 4.00% by volume) at the facility boundary and (25% LEL or 1% by volume) in structures. LFG records will be submitted to the SWS in the event that stabilized methane or hydrogen sulfide levels exceed these limits or upon SWS request. 2 LANDFILL GAS MONITORING 2.1 LANDFILL GAS PROBES 2.1.1 LANDFILL GAS PROBE LOCATIONS Greene County Landfill facility located in Walstonburg, NC consists of an active construction and demolition (C&D) landfill vertical expansion atop an unlined landfill. LFG migration has consistently been monitored by a network of probes and within structures surrounding each unit. The existing monitoring network was established predominately by geography around the entire periphery of the landfill. The landfill shall be monitored by 11 existing LFG probes (MP-1, MP-2, MP-3, MP-4A, MP-5, MP-6, MP-7, MP-8, MP-9, MP-10 and MP-11A). A drawing showing the approximate locations of the LFG monitoring probes is shown on Sheet 2. No additional monitoring locations are currently proposed around the landfill. 4 2.1.2 LANDFILL GAS PROBE CONSTRUCTION SPECIFICATIONS All known details of the existing LFG probe construction are shown on Table 1. All LFG monitoring probes were installed prior to issuance of construction specifications outlined in the SWS Guidance Document (Nov. 2010). New probes are not proposed to be installed. In the event unrepairable damage occurs to any existing probe or migration investigations are initiated new probes will be installed per specifications outlined in SWS Guidance Document with the exception the probes may be constructed of 1” PVC and the outer protective case may be constructed out of non-sparkable aluminum. All probes will be equipped with a stopcock ball valve bushed to the well casing, quick connect coupling threaded into the well cap or an equivalent device that allows air flow to be controlled at the wellhead as shown on Figure 1. 2.2 STRUCTURE MONITORING The inside of three on-site non-residential (restricted use) structures (SHELTER, SCALEHOUSE and SHOP) will be monitored quarterly for LFG accumulation in accordance with the Guidance Document. If new on-site structures are erected in the future, they will also be monitored along with the existing ones. All on-site structures are detailed on Sheet 2 and Table 1. 2.3 LANDFILL GAS MONITORING FREQUENCY LFG monitoring will be performed and documented on at least a quarterly basis (four times annually approximately three months apart). Monitoring per this plan will be initiated during the first scheduled quarterly event following SWS approval. Monitoring frequency will not be decreased without prior authorization by the SWS. 3 LANDFILL GAS SAMPLING PROCEDURE 3.1 EQUIPMENT Instrumentation must be capable of accurately reading percent methane, percent hydrogen sulfide, percent oxygen and percent carbon dioxide. Instruments shall be calibrated according to manufacturer’s specifications prior to performing monitoring. Although other instrument(s) maybe available which meet or exceed these requirements that would also be deemed acceptable the most common instrument is a Landfill Gas Analyzer manufactured by LANDTEC which includes models such as GEM500, GEM2000 and GEM5000. Stopcock valves on monitoring probes should remain in a closed position until instrument tubing is tightly sealed. 5 3.2 MONITORING PROCEDURE LFG monitoring will be performed by personnel that understand the principles of operation and use instruments per manufacturer’s instructions. LFG monitoring shall be performed in accordance with procedures outlined in the most current NC SWS issued Landfill Gas Monitoring Guidance Document. A copy of the current SWS Guidance Document dated November 2010 is included in Appendix A. If, during a sampling event, groundwater is suspected to be over a probe intake the depth to groundwater will be measured and recorded. If the intake is fully submerged, LFG readings will not be attempted to avoid damage to the instrument. Deviation from procedures outlined in this plan may be warranted depending on facility conditions or unforeseen variables. Any variance from the methodology contained in the current SWS Guidance Document will be consistent with industry standards and be described in the associated LFG monitoring report. 4 RECORD KEEPING AND REPORTING 4.1 MONITORING DATA FORM LFG monitoring event results shall be recorded on a Landfill Gas Monitoring Data Form. The monitoring data form should contain at least the information outlined in the SWS Guidance Document as shown on the example form in Appendix B. 4.2 MONITORING REPORTS A landfill gas monitoring report consisting of at a minimum the completed Landfill Gas Monitoring Report Form and a site drawing showing the location of each monitoring location shall be drafted shortly following every quarterly monitoring event. 4.3 PERMANENT RECORD KEEPING Landfill gas monitoring records including monitoring plans, monitoring reports and remediation plans will be retained at the facility in an operating record and updated as the information becomes available. Reports will be sent to the SWS only in the event methane or hydrogen sulfide is detected above allowable limits or per request. LFG monitoring probe probe construction and well abandonment records will not be submitted to the NC Division of Water Quality (DWQ) unless they inadvertently intercept groundwater. LFG monitoring probe well construction and abandonment records will be submitted on current DWQ forms to the SWS and kept in the facilities’ permanent file. Table 1: Existing Landfill Gas Monitoring Location Details MP-1 Probe Unlined and C&D 649347.54 2388285.10 11 5.60 Yes Soil MP-2 Probe Unlined and C&D 649345.94 2388613.40 13 5.60 Yes Soil MP-3 Probe Unlined and C&D 649347.43 2388881.00 10 4.90 Yes Soil MP-4A Probe Unlined and C&D 649380.20 2389208.80 17 2.60 No Soil MP-5 Probe Unlined and C&D 648963.54 2389033.30 11 5.80 Yes Soil MP-6 Probe Unlined and C&D 648549.13 2389004.10 6 6.20 Yes Soil MP-7 Probe Unlined and C&D 648533.42 2388423.70 4 6.00 Yes Soil MP-8 Probe Unlined and C&D 648530.02 2388175.30 2 5.50 Yes Soil MP-9 Probe Unlined and C&D 648703.28 2388209.50 3 6.50 Yes Soil MP-10 Probe Unlined and C&D 649067.65 2388222.20 6 2.10 Yes Soil MP-11A Probe Unlined and C&D 649388.54 2388221.60 9 3.30 No Soil SHELTER Structure Unlined and C&D 648751.66 2388257.20 4 - - - SCALEHOUSE Structure Unlined and C&D 648590.82 2388220.00 2 - - - SHOP Structure Unlined and C&D 648667.43 2388356.60 4 - - - Information compiled from prior hydrogeologic investigations, verbal interviews and field measurements on August 14, 2015. All probes installed prior to issuance of construction speciifications outlined in the SWS Guidance Document (Nov. 2010). LFG Monitoring Location ID Depth to Groundwater (approx.) (ft BGS) Predominant Screened Lithology Monitored UnitType Northing (approx.) Easting (approx.)Total Depth (ft BGS) Protective Locking Outer Steel Case September 7, 2016 (FT AMSL) (FT BTOC) (FT AMSL) 15A NCAC 2L Groundwater Quality Standard MW-1R 121.78 4.83 116.95MW-4 117.89 16.31 101.58 MW-5 115.76 16.23 99.53 MW-6 117.41 8.53 108.88 MW-7 110.48 11.57 98.91 MW-8 111.36 10.38 100.98 Groundwater Elevations WELL ID TOP OF CASING ELEVATION DEPTH TO WATER GROUNDWATER POTENTIOMETRIC ELEVATION 1 ! 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PHWKDQHVRXUFH NC Division of Waste Management - Solid Waste Section Landfill Gas Monitoring Data Form Notice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nstructions: 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I am aware that there are significant penalties for making any false statement, representation, or certification including the possibility of a fine and imprisonment. BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB 6,*1$785(7,7/( SECTION 7 - References $JHQF\IRU7R[LF6XEVWDQFHV 'LVHDVH5HJLVWU\³/DQGILOO*DV3ULPHU$Q2YHUYLHZIRU(QYLURQPHQWDO +HDOWK3URIHVVLRQDOV´KWWSZZZDWVGUFGFJRY+$&ODQGILOOKWPOWRFKWPODFFHVVHG)HEUXDU\ &DOLIRUQLD(QYLURQPHQWDO3URWHFWLRQ$JHQF\³/DQGILOO*DV0RQLWRULQJ:HOO)XQFWLRQDOLW\DW &DOLIRUQLD/DQGILOOV´KWWSZZZFDOUHF\FOHFDJRY3XEOLFDWLRQV2UJDQLFVSGIDFFHVVHG )HEUXDU\ )ORULGD'HSDUWPHQWRI(QYLURQPHQWDO3URWHFWLRQ*DV0DQDJHPHQW6\VWHPVXQGHU5XOH KWWSZZZGHSVWDWHIOXVZDVWHTXLFNBWRSLFVUXOHVGHIDXOWKWPDFFHVVHG)HEUXDU\ 0LVVRXUL'HSDUWPHQWRI1DWXUDO5HVRXUFHV)ORRG*UDQW7HDP³$Q$QDO\VLVRI/DQGILOO*DV0RQLWRULQJ :HOO'HVLJQDQG&RQVWUXFWLRQ´KWWSZZZFOX LQRUJFRQILWUFGLUHFWSXVKSUH]0LVVRXULB6WXG\SGIDFFHVVHG)HEUXDU\ 0LVVRXUL'HSDUWPHQWRI1DWXUDO5HVRXUFHV³'HVLJQDQG&RQVWUXFWLRQRI/DQGILOO*DV0RQLWRULQJ:HOOV´ KWWSZZZGQUPLVVRXULJRYSXEVSXESGIDFFHVVHG)HEUXDU\ :LVFRQVLQ'HSDUWPHQWRI1DWXUDO5HVRXUFHV(QYLURQPHQWDO0RQLWRULQJIRU/DQGILOOVXQGHU&KDSWHU15 KWWSZZZGQUVWDWHZLXVRUJDZZPLQIRUPDWLRQZLDFVVVKWP DFFHVVHG)HEUXDU\ ³/DQGILOO*DVDQ2YHUYLHZ´/DQGILOOJDVFRP:HE)HE KWWSZZZODQGILOOJDVFRPZHESDJH/)*RYHUYLHZGRF SECTION 8 – Suggested Outline for a Landfill Gas Monitoring Plan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igures 0DSGLVSOD\LQJSURSRVHGODQGILOOJDVPRQLWRULQJZHOOORFDWLRQV 3RWHQWLRPHWULF6XUIDFH0DS 'LDJUDPVKRZLQJFRQVWUXFWLRQRIVWRSFRFNYDOYHRUTXLFNFRQQHFWFRXSOLQJRQZHOOFDS 'LDJUDPVKRZLQJZHOOFRQVWUXFWLRQRIHDFKODQGILOOJDVPRQLWRULQJZHOO Table 7DEOHGLVSOD\LQJZHOO,'ZHOOGHSWKVFUHHQLQWHUYDOGHSWKWRJURXQGZDWHU ([DPSOHRIODQGILOOJDVPRQLWRULQJGDWDIRUP SECTION 9 – Checklist of Items to be Included in a Landfill Gas Monitoring Plan 'HSWKWRJURXQGZDWHUGLVFXVVLRQ :HOOORFDWLRQV D 1XPEHURIZHOOV E :HOOVSDFLQJ ,QVWUXPHQWDWLRQEHLQJXVHG D &DOLEUDWLRQSURFHGXUHV 6DPSOLQJSURFHGXUHVDVSHUWKHPDQXIDFWXUH¶VLQVWUXFWLRQV 0DSRIZHOOORFDWLRQV 7DEOHGHVFULELQJHDFKZHOOORFDWLRQ D :HOO,' E :HOOGHSWK F 6FUHHQLQWHUYDO G 'HSWKWRJURXQGZDWHU H 6XEVXUIDFHOLWKRORJ\ 'LDJUDPRIFDSFRQVWUXFWLRQZVWRSFRFNYDOYHRUTXLFNFRQQHFWFRXSOLQJ 'LDJUDPRIZHOOFRQVWUXFWLRQ 3RWHQWLRPHWULFVXUIDFHPDS 3URIHVVLRQDO*HRORJLVWFHUWLILFDWLRQ 5HJLVWHUHG/DQG6XUYH\RUFHUWLILFDWLRQ NC Division of Waste Management – Solid Waste Section YEAR QUARTER Landfill Gas Monitoring Data Form Facility Name:Greene Co. Active CDLF and Closed Unlined Landfill Permit Number:40-01 Date of Sampling:NC Landfill Rule (.0500 or .1600):0.1600 Name & Position of Sample Collector: Type & Serial Number of Gas Meter: Date Factory Calibration of Gas Meter: Date & Time of Field Calibration: Type of Field Calibration Gas (15/15 or 35/50): Expiration Date of Field Calibration Gas Canister: Pump Rate of Gas Meter: Ambient Air Temperature: Barometric Pressure: General Weather Conditions: Sample Tube Purge Time Pumped Initial Ch4 Stabilized Ch4 Stabilized % CH4 O2 CO2 H2S (Seconds) (Seconds) (%LEL) (%LEL) (%/Vol.) (%/Vol.) (%/Vol.) (%/Vol.) MP-1 MP-2 MP-3 MP-4A MP-5 MP-6 MP-7 MP-8 MP-9 MP-10 MP-11A SHELTER SCALEHOUSE SHOP Methane Standard at property line 100% LEL, 5% By Volume, 50,000 PPM Methane Standard in Buildings 25% LEL, 1.25% By Volume, 12,500 PPM of Methane H2S Standard at property line 100% LEL, 4% By Volume, 40,000 PPM H2S Standard in Buildings 25% LEL, 1% By Volume, 10,000 PPM EXTRA COMMENTS: Certification SIGNATURE TITLE Form Revised:6/14/2017 Notice:This form and any information attached to it are “Public Records” as defined in NC General Statute 132-1. As such, these documents are available for inspection and examination by any person upon request (NC General Statute 132-6). Instructions: Under “Location or LFG Well” identify the monitoring wells or describe the location for other tests (e.g., inside buildings). A drawing showing the location of test must be attached. Report methane readings in both %LEL and % methane by volume. A reading in percent methane by volume can be converted to %LEL as follows: % methane by volume = %LEL/20 To the best of my knowledge, the information reported and statements made on this data submittal and attachments are true and correct. I am aware that there are significant penalties for making any false statement, representation, or certification including the possibility of a fine and imprisonment. Location or LFG Well ID Time Reading Taken Notes