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Home My WebLink About0403_Chambers_LandFillGasPlan_DIN26673_20160819Landfill Gas Monitoring Plan Anson Waste Management Facility Phases 1 through 4 Submitted to: 11&'(15'LYLVLRQRI:DVWH0DQDJHPHQW Solid Waste Section 217 W Jones Street Raleigh, NC 27603 Presented to: :DVWH&RQQHFWLRQV,QFRI1RUWK&DUROLQD 375 Dozer Drive Polkton, North Carolina 28135 Presented by: SCS ENGINEERS, PC 322 Chapanoke Road Raleigh, NC 27603 (919) 662-3015 July 28, 2015 File No. 02214709.00 Offices Nationwide www.scsengineers.com Environmental Consultants 322 Chapanoke Road 919 662-3015 and Contractors Suite 101 FAX 919 662-3017 Raleigh, NC 27603-3415 www.scsengineers.com File No. 02214709.00 July 28, 2015 Mr. Ed Mussler, P.E., Permitting Branch Head NC DENR Division of Waste Management Solid Waste Section 217 W Jones StreetRaleigh, NC 27603 RE: Landfill Gas Monitoring Plan Anson Waste Management Facility Polkville (Anson County), North CarolinaNC DENR Solid Waste Permit #04-03 Dear Mr. Mussler: On behalf of Waste Connections, Inc. of North Carolina, we are pleased to present the following Landfill Gas (LFG) Monitoring Plan, prepared in accordance with Solid Waste Rule 15A NCAC 13B .1626 (4). This plan discusses (in brief) the nature of landfill gas, allowable concentrations for explosive gas around the facility, monitoring locations, well depths (i.e., gas probes), and methodology, sampling schedule, procedures and record keeping. Emphasis will be placed on protecting human health and safety for persons working at the facility – there are no known occupied structures in proximity except for facility buildings (offices and garages). This plan focuses on monitoring to detect subsurface gas migration from the waste containment cells. The plan does not amend any previous submittal and will be implemented immediately upon approval by the Solid Waste Section. Please contact us if you have questions or comments. Sincerely, G. David Garrett, PG, PE Steven C. Lamb, PE Project Manager Vice President SCS ENGINEERS, PC SCS ENGINEERS, PC 7/28/2015 cc: Mr. Nelson Breeden, PE – Regional Engineer, Waste Connection of North Carolina, Inc. Mr. John Murray, PE – NCDENR Division of Waste Management, Solid Waste Section Landfill Gas Monitoring Plan Anson Waste Management Facility Landfill Gas Monitoring Plan Anson County Solid Waste Facility Submitted to: NCDENR Division of Waste Management Solid Waste Section 217 W Jones Street Raleigh, NC 27603 Presented to: Waste Connections, Inc. of North Carolina 375 Dozer Drive Polkton, North Carolina 28135 SCS ENGINEERS, PC 322 Chapanoke Road Raleigh, NC 27603 (919) 662-3015 July 28, 2015 File No. 02214709.00 Landfill Gas Monitoring Plan Anson Waste Management Facility i Table of Contents Section Page 1.0 INTRODUCTION ..................................................................................................................................... 1 1.1 Background Information .............................................................................................................. 1 1.2 Regulatory Requirements ........................................................................................................... 1 1.3 Current Site Conditions ............................................................................................................... 2 1.4 Monitoring Location Criteria ...................................................................................................... 2 2.0 LFG MONITORING................................................................................................................................ 3 2.1 Monitoring Devices and Procedures ......................................................................................... 3 2.2 Monitoring Schedule .................................................................................................................... 4 3.0 CONTINGENCY PLAN .......................................................................................................................... 4 4.0 CERTIFICATION ...................................................................................................................................... 5 List of Tables No. Page 1 Summary of Gas Monitoring Probe Locations Attachments A Landfill Gas Monitoring Guidance – from NCDENR Division of Waste Management B LFG Monitoring Locations Site – Figure 1 C LFG Well Construction Schematic D Landfill Gas Monitoring Field Log Landfill Gas Monitoring Plan Anson Waste Management Facility 1 1.0 INTRODUCTION The following plan has been prepared as a standalone document in accordance with current NCDENR Solid Waste Section (SWS) guidance. The monitoring locations, methods, and thresholds for action are based on the SWS document “Landfill Gas Monitoring Guidance,” November 2010, available online at http://portal.ncdenr.org/c/document_library/get_file?uuid=da699f7e-8c13-4249-9012- 16af8aefdc7b&groupId=38361. The guidance contains specific requirements for well construction, equipment calibration, sampling procedures, and data keeping, in a plan that is organized in a standardized format. This document is found in Attachment A. 1.1 BACKGROUND INFORMATION Landfill gas (LFG) is a by-product from the decomposition of organic waste in a landfill, which includes methane, carbon dioxide, hydrogen sulfide, water, and other constituents. Methane can be explosive under certain conditions, and LFG migration has been known to transfer certain contaminants into ground water. The Solid Waste Rules typically focus on the explosive propertiesof LFG from a public safety standpoint. Subsurface gas normally migrates above the ground water table and is restricted laterally by streams. Pipelines or trenches (if present) can serve as potential conduits for off-site LFG migration; although the soils existing just above the bedrock are often very porous and can potentially serve as gas migration pathways. No occupied structures off-siteappear to be at risk for gas migration. Active gas recovery is the primary means of controlling gas at this facility. A Landfill Gas Control Plan was implemented soon after landfill operations commenced. A network of extraction wells installed in the waste are connected to a blower station and the collected LFG flared. Methane monitoring wells (landfill gas probes) are installed above the water table usingconstruction techniques that are otherwise similar to ground water monitoring wells. Components of the active gas recovery system are not to be monitored. LFG monitoring will be performed during the active life of the landfill and throughout the post- closure care period. Quarterly monitoring will be conducted at all probes and in occupied structures located on the landfillproperty. 1.2 REGULATORY REQUIREMENTS NCAC 15A 13B .1626 (4) (a) requires monitoring for the following explosive gas limits: x 25% of the Lower Explosive Limit (LEL), o r 5% methane in standard atmosphere within occupied structures – excluding the gas recovery systems x 100% LEL at the facility boundary x No detectable concentration at off-site occupied structures. Landfill Gas Monitoring Plan Anson Waste Management Facility 2 Solid Waste Section guidance requires that LFG be monitored with a calibrated meter that is capable of detecting hydrogen sulfide, whereas action limits are 4% by volume at 100% LEL and 1% by volume at 25% LEL. 1.3 CURRENT SITE CONDITIONS The subject landfill is situated high on a ridge bounded on three sides by blue line streams, which act as natural barriers to gas migration. Potentiometric contours reflect the surface topography, which slopes moderately to the north but diverges sharply to the east and west toward the streams located along the facility boundary. Topographic relief near the west stream is steep, with elevation changes from the footprint to the streams on the order of 70 feet with up to 20% slopes, but the topo slopes gently to the east stream with slopes generally less than 5%. The landfill is lined and is mostly excavated to the approved base grades on the west side, while the footprint is built up with a constructed 15-foot high perimeter embankment along the east side. Onsite soils are slightly porous silt and clay weathered from meta-volcanic argillite and Triassic sedimentary formations – typically exhibiting low permeability – which originally extended 20 to 40 feet beneath the surface. The soils gradually transition with depth to a variably thick layer of porous “partially weathered rock” overlying hard, low porosity non-weathered rock. On the west and north sides of the disposal footprint deep wide-spread excavation has removed much of the overburden soil. The water table is approximately 10 to 30 feet deep over most of the site, including the up-gradient side of the landfill, except near the streams where water levels are 5 to 8 feet deep. The approved base grades are 30 feet or more above the level of the streams and a minimum of 4 feet above groundwater and/or bedrock. Lateral separation to the streams is 50 feet minimum; these dimensions provide little opportunity for gas to migrate beyond the facility boundary on the three sides bound by streams. The nearest know residence exists approximately 1700 feet to the south and east of the MSWLF. Other occupied structures include a maintenance building (metal shell on concrete slab) located approximately 500 feet south east of the footprint and approximately 800 feet east of the gas flare. The scale house (mobile building) is located approximately 1000 feet south of the waste boundary. A small cemetery exists approximately 400 feet east of the Phase 1 footprint. The facility offices are approximately one-half mile south of the waste boundary. . 1.4 MONITORING LOCATION CRITERIA Gas migration is a process of diffusion through porous media, affected by porosity and permeability, similar to ground water within an unconfined or partly confined soil aquifer. For gas, pressures and concentrations are higher near the source and gradually decrease with distance –unless a distinct conduit is present – thus a “halo effect” is often discernable. The gas can beconfined in the soil by lower permeability clay layers and saturated layers – impermeable to gas – that can occur either above or below the porous layer. At this site, horizontal permeability for ground water flow appears to exceed vertical permeability, due in part to the shape of the saprolite (PWR) aquifer, as it conforms to the topography and upper bedrock surface; true for water and gas. The unsaturated saprolite is the likely gas conveyance and is the target of the gas monitoring plan. Landfill Gas Monitoring Plan Anson Waste Management Facility 3 Placement of perforated pipe for gas monitoring above the water table is standard practice. The required horizontal placement for gas monitoring appurtenances (either wells or bar-hole punch locations) is not defined. Considering the similarities of gas migration to ground water, with a compliance boundary established at property lines, a sensible criteria for test locations is outsidethe perimeter of any gas conveyances (such as recovery system pipelines) and approximately halfthe distance from the source to the compliance boundary – or no more than 150 feet if the property line is more than 300 feet from the source – thus establishing a review boundary. Gas probe locations are shown on Figure 1 (Attachment B). Distances between the probes are approximately 250 feet. 2.0 LFG MONITORING 2.1 MONITORING DEVICES AND PROCEDURES Equipment: A portable gas monitoring device, e.g., LandGEM 5000 shall be used to measure methane gas in the probes. Concentrations shall be reported in units of percent methane or percent of the lower explosive limit (LEL). The LEL for methane is approximately 5%. SWS Guidelines require monitoring for hydrogen sulfide (H2S) in addition to methane gas. General sampling procedures are discussed below, relative to different types of monitoring appurtenances and locations, but the instructions for the specific monitoring device should be followed. Occupied Buildings: Monitoring of on-site structures will be conducted during regular monitoring events at the earliest possible time after the structure has been unused (e.g., early morning). Methane and hydrogen sulfide are both heavier than air and tend to accumulate in the lower zones with restricted circulations, i.e., crawlspaces, closets, corners of rooms near the floor, cracks in walls, floor slabs, foundations, crawlspace vents, drainage pipes, and utility vaults. Alternatively, the buildings may be equipped with continuous explosive gas detection devices. Gas monitoring will also be conducted in any confined space requiring the entry of personnel for maintenanceor inspection. The monitoring will take place prior to entry by personnel in accordance with OSHAregulations. Within the buildings, atmospheric sampling for methane and hydrogen sulfide shall be conducted. Ambient monitoring: This includes a “walk-around” at the toe of landfill slopes to survey for gas that may be seeping through the intermediate or permanent cover. A key to potential side slope seepage includes stained soil, wetness with visible bubbling, or distressed (or absent) vegetation. Any detection of methane or hydrogen sulfide in the ambient monitoring should be noted on a site map and a special notation recorded in the monitoring report. Bar-Hole Punch Locations: Gas monitoring in bar-hole punches will consist of punching a hole with a 3-foot probe. Tubing that is open-ended and perforated on the bottom should be placed in the bottom of the hole, taking care not to plug the bottom of the tubing with soil. The peak methane reading should then be recorded for each bar-hole probe location. Methane Monitoring Wells: Also called “landfill gas probes,” appropriate monitoring depths for this site have been established as 15 feet, or the water table, whichever is encountered first, which implies the need for permanent gas monitoring wells. Each gas monitoring well will be constructed Landfill Gas Monitoring Plan Anson Waste Management Facility 4 with a 10-foot perforated section sealed below a bentonite plug, similar to ground water monitoring well construction, with appropriate stickups for visibility and locking covers. Each well shall be “sniffed” with a gas meter (calibrated for methane) equipped with a probe or open-ended tube that can inserted into the sampling port set within the well cap. Readings should be taken over a five-minute period (or as recommended by the equipment manufacturer) and the peak methane reading should then be recorded, either as percent methane or percent LEL, depending on the meter output. SWS guidelines include a well construction schematic, found in Attachment C. Record Keeping: The sampling technician shall record the date, time, location, sampling personnel, atmospheric temperature, reported barometric pressure, and general weather conditions at the time of sampling, in addition to the concentration of combustible gases. The sampling results are to be recorded on a form, such as the example Landfill Gas Monitoring Field Log shown in Attachment D.The records will be maintained in the landfill operating record for the life of the facility. 2.2 MONITORING SCHEDULE The Solid Waste Rules require quarterly monitoring. Landfill gas monitoring will be performed during the active life of the landfill, currently estimated at 20+ years, and throughout the post- closure care period, 30 years unless future data warrant a revision and subject to approval by the SWS. 3.0 CONTINGENCY PLAN Solid Waste Rule NCAC 15A 13B .1626 (4) (c) specifies that, upon detection of methane exceeding the threshold values (described above), the facility management must perform the following: x Immediately take steps required to protect human health and notify the Division x Within seven days place in the operating record a report of the methane gas levels and the location of the detection, along with a description of the response to protect human health x Within 60 days implement a remediation plan for the methane gas release, place a copy of the plan in the Operating Record and notify the Division that the plan has been implemented – the plan shall describe the nature and extent of the problem and the proposed remedy. Landfill Gas Monitoring Plan Anson Waste Management Facility 5 4.0 CERTIFICATION The certification statement below must be signed and sealed by a North Carolina Professional Geologist or Professional Engineer and submitted with the Landfill Gas Monitoring Plan. The Landfill Gas Monitoring Plan for this facility has been prepared by a qualified geologist or engineer who is licensed to practice in the State of North Carolina. The plan has been prepared based on first-hand knowledge of site conditions and familiarity with North Carolina solid waste rules and industry standard protocol. This certification is made in accordance with North Carolina Solid Waste Regulations, indicating this Landfill Gas Monitoring Plan should provide early detection of any release of hazardous constituents to the uppermost aquifer, so as to be protective of public health and the environment. No other warranties, expressed or implied, are made. Signed __________________________ Printed G. David Garrett, PG, PE Date July 6, 2015 Not valid unless this document bears the seal of the above mentioned licensed professional. If wells are installed in the future, the well locations shall be shown on a topographic map that is signed and sealed by a registered surveyor. Well construction shall conform to the current Solid Waste Section standards, including a sampling port on the cap. Landfill Gas Monitoring Plan Anson Waste Management Facility 6 Table 1 Summary of Gas Monitoring Probe Locations Probe Location GP-1 Southeast corner of Phase1, near maintenance building GP-2 South of Phase1, near gas works GP-3 East of Phase1, over diabase dike GP-4 South of Phase1, near southwest corner GP-5 South of Phase1, near Phase 2 line GP-6 East of Phase 2 GP-7 South of Phase1, near railroad cut GP-8 West of Phase , near future southwest corner GP -9 West of Phase GP -10 West of Phase GP -11 North of Phase GP -12 North of Phase Landfill Gas Monitoring Plan Anson Waste Management Facility Attachment A Landfill Gas Monitoring Guidance NCDENR Division of Waste Management 1257+&$52/,1$'(3$570(172) (19,5210(17$1'1$785$/5(6285&(6 ',9,6,212):$67(0$1$*(0(17 62/,':$67(6(&7,21 /$1'),//*$6021,725,1**8,'$1&( 129(0%(5 7$%/(2)&217(176 6HFWLRQ±,QWURGXFWLRQ«««««««««««««««««««««3DJH 6HFWLRQ±)DFWRUV,QIOXHQFLQJ/DQGILOO*DV*HQHUDWLRQDQG0LJUDWLRQ««««««««««3DJH 6HFWLRQ&XUUHQW6ROLG:DVWH6HFWLRQ5XOHV3HUWDLQLQJWR/DQGILOO*DV0RQLWRULQJ««««3DJH 6HFWLRQ±/DQGILOO*DV,QFLGHQWVDQG([SORVLRQV««««««««««««««««««3DJH 6HFWLRQ±/DQGILOO*DV0RQLWRULQJ:HOOV«««««««««««««««««««««3DJH 6HFWLRQ±/DQGILOO*DV0RQLWRULQJ,QVWUXPHQWDWLRQ«««««««««««««««««3DJH 6HFWLRQ±5HIHUHQFHV«««««««««««««««««««««««««««««3DJH SECTION 1 - 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Landfill Gas Monitoring Plan Anson Waste Management Facility Attachment B LFG Monitoring Locations Site – Figure 1 SCS ENGINEERS, PC 2520 WHITEHALL PARK DRIVE, SUITE 450 CHARLOTTE, NORTH CAROLINA 28273 PHONE: (704) 504-3107 FAX: (704) 504-3174 LFG1LANDFILL GAS MONITORING LOCATIONS LANDFILL GAS MONITORING PLAN WASTE CONNECTIONS OF THE CAROLINAS 375 DOZER DRIVE POLKTON, NC 28135 N Landfill Gas Monitoring Plan Anson Waste Management Facility Attachment C LFG Well Construction Schematic Landfill Gas Monitoring Plan Anson Waste Management Facility Attachment D Landfill Gas Monitoring Field Log Revised – March 6, 2017 NC Division of Waste Management - Solid Waste Section Landfill Gas Monitoring Data Form 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). Facility Name: Permit Number: Sampling Date: NC Landfill Rule (.0500 or .1600): Sample Collector Name & Position: Gas Meter Type & Serial Number: Gas Meter Calibration Date: Field Calibration Date & Time: Field Calibration Gas Type (15/15 or 35/50): Field Calibration Gas Canister Expiration Date: Gas Meter Pump Rate: Ambient Air Temperature: Barometric Pressure (in. or mm Hg): Weather Conditions: Instructions: Under “Location or LFG Well”, list monitoring well # or describe monitoring location (e.g., inside field office). Attach a test location map or drawing. Report methane readings as both % LEL and % CH4 by volume. Convert % CH4 (by volume) to % LEL as follows: % methane (by volume)/20 = % LEL. *Hydrogen Sulfide (H2S) gas monitoring may be required for Construction & Demolition Landfills (CDLFs). See individual permit conditions and/or Facility LFG monitoring plan. Location or LFG Well ID Sample Tube Purge Time of Day Time Pumped (sec) Initial % LEL Stabilized % LEL % CH4 (volume) % O2 (volume) % CO2 (volume) % H2S* (volume) NOTES NOTE: If needed, attach additional data forms to include additional LFG monitoring data locations for the facility. ACTION LEVELS: Methane: >1.25% by volume (inside structures) AND >5% by volume (at facility boundary) Hydrogen Sulfide: >1% by volume (inside structures) AND >4% by volume (at facility boundary) Certification 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. SIGNATURE TITLE