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Home My WebLink About0601_AveryCounty_MSWLF_Sept21LFG_FID1628589_20211222DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 SMITH GARDNER ADDRESS TEL WEB 14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com October 10, 2021 Ms. Jaclynne Drummond NCDENR DWM Solid Waste Section 2090 U.S. 70 Highway Swannanoa, North Carolina 28778-8211 RE: Operations, Monitoring, and Maintenance Report — September 2021 Avery County Closed MSW Landfill (Permit No. 06-01) Spruce Pine, North Carolina Dear Ms. Drummond: On behalf of Avery County (County), Smith Gardner, Inc. (S+G) is pleased to present this report regarding the operation and maintenance (0&M) of the Avery County Closed MSW Landfill (Permit No. 06-01) Landfill Gas Collection and Control System (LFGCCS), and the perimeter monitoring probes for September 2021. Site details are provided below. SITE HISTORY The Avery County Closed MSW landfill is located approximately 0.6 miles southeast of the intersection of Highway 19 and Brushy Creek Mountain Road next to the Avery County Airport and the Unimin Corporation sand mine facility. There is no active mining in the immediate vicinity of the landfill. The MSW landfill was operated from 1970 until it closed in 1993. The property consists of approximately 14.4 acres, with the landfill footprint occupying approximately 9.6 acres of the site. Landfill topography ranges in elevation from approximately 2770 ft. msl to 2670 ft. msl, and slopes downhill toward Brushy Creek. Landfill gas monitoring and LFGCCS maintenance is completed on a monthly basis due to Landfill gas concentrations detected in monitoring probes off -site. LFG COLLECTION AND CONTROL SYSTEM MONITORING ACTIVITIES The site has an active Landfill Gas Collection and Control System (LFGCCS) consisting of 10 Landfill gas extraction wells (W-1 through W-10), HDPE piping for transmission of collected Landfill gas, a one (1) horsepower blower, a condensate trap and storage tank, a candlestick Rare, and associated valves and gauges. Well field and flare station data are provided in the attached Table 1. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 Ms. Drummond December 6, 2021 Page 2 of 4 LFG Extraction Well Field • W-1 through W-10: S+G performed methane (CH4), oxygen (02), and carbon dioxide (CO2) monitoring as well as flow and pressure monitoring. In general, gas quality has a wide variance across the wellfield. All wells with the exception of W-5 and W- 6 had recorded oxygen levels below 5% this sampling event. The wells will continue to be tuned to limit the concentration of oxygen in the landfill gas. Flare Station Gas quality measured at the flare is nominal with low levels recorded of methane, and higher levels recorded of oxygen. The higher oxygen levels may be a result of higher oxygen levels measured in the wellfield, and will be investigated further. The wellfield will continue to be monitored, tuned, and maintained as necessary to identify potential issues with the system and to improve gas quality levels. LFG MONITORING WILL (PERIM[TER) MONITORING PROGRAM S+G performed monitoring of the perimeter LFG monitoring network during this event. The network consists of probes P-1 through P-13 located around the facility, and in some cases, on adjacent properties. Monitoring results for this month indicate the following probes have Landfill gas concentrations above the LEL: • P-3 • P-7 It should be noted that P-3 is located on the landfill property, immediately adjacent to waste on the northern boundary of the site. The concentration in P-3 is significantly lower than the peak observed in fall of 2019. Monitoring probe P-7, also located on the landfill property adjacent to waste, had a methane concentration of 11.3% this month. This is above the LEL, and is higher than the past monitoring event. Both P-3 and P-7 have been connected to the LFG collection system with an applied vacuum to reduce the migration of LFG. Off -site monitoring probes, P-11 and P-12, which are located further from the waste near P-3 and P- 7 do not have detectable concentrations of methane. The remaining perimeter monitoring probes generally do not have detectable concentrations of methane. Attachment 1 includes the monitoring forms with results while Attachment 2 provides a CH4 concentration graph over time for monitoring wells that have historically had methane present. Monitoring of the current well network will continue, and data will be reported to NCDEQ and the County. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 Ms. Drummond December 6, 2021 Page 3 of 4 In general, the landfill gas extraction system continues to operate nominally. W-5 and W-6 will continue to be tuned to limit oxygen into the system. S+G will continue to monitor the methane concentrations at the site monthly, and advise the County as needed on repairs required to maintain an effective collection system. The next monitoring event is scheduled for October 2021. If you have any questions, or require additional information, please contact us at your earliest convenience at 919-828-0577 or by e-mail (address below). Sincerely, SMITH GARDNER, INC. `�„�11111111Hrrlr/l � s A �� DocuSigned by: _' • QP �ZZ��Z 1 SEAL _ 5r81313721KE5F488..c,wu,v i1i1. %�bl(bwtbw cn 046707 z . � • .C) 91 S J ti Spencer W. Hollomon, P.E. G1NS1�- " O Project Engineer, ext. 134 �,'�F� W \A \`�� sDencer(asmithaardnerinc.com Attachments cc: Eric Foster - Avery County file CAR 0� EN a SSEA 9 EDocuSigned by: bav� B9779EBA711F488... Joan A. Smyth, P.G. Senior Hydrogeologist ext. 2 ioanfasmithgardnerinc.com H:\Projects\Avery County INCI\02 AC Compliance\LFG Monitoring\MSW\2021\09 September2021\September 2021 Avery MSW LFG Monitoring Report.docx ��ri ��` A. ✓. 1 DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 Ms. Drummond December 6, 2021 Page 4 of 4 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 MUM DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 ti 41 w i• — & . - I AP • •.. , , 0. r - `• ♦ i ► ' r+• i� O+ , \ . i 1• ARN 10 go Ok Irk y ,� *fit•' � 6 �,. -7,/ ,,�J � r� •,w • 1 r O % . ; / ' • �. op . - • A • v� 4 • ... •" `- 'low � �► #. AVERY COUNTY V LANDFILL low,f ,jam •' �} tti.• a �r 1 1- � ..,�, �! •� A LEGEND • T� ' 1 • . 0 EXISTING LANDFILL GAS PROBE • +• ® OFFSITE STRUCTURE TO BE ' •^ ■ MONITORED ,,. •�;�` REFERENCES «�A 1. ADJACENT PROPERTIES ARE FROM AVERY COUNTY GIS MAPPING DEPARTMENT. _• r 2. MONITORING WELL LOCATIONS FROM FIELD SURVEY DATED 1/14/08, BY SURVEYING SOLUTIONS, P.C. 3. PROPERTY LINE FROM FIELD SURVEY DATED APRIL 9, 2010, BY .1�►.,N APPALACHIAN PROFESSIONAL LAND SURVEYORS & CONSULTANTS. • 4. LFG PROBES LOCATIONS FROM FIELD SURVEY DATED APRIL 9, 2010, BY APPALACHIAN PROFESSIONAL LAND SURVEYORS & CONSULTANTS. �, • • PROBE P-2, P-3, AND P-9 THROUGH P-13 LOCATIONS WERE NOT •; SURVEYED AND ARE APPROXIMATE. or•�411F 00 0 N 0 m w w z z a w � J O U -) a Lu Z 11, U C U Q G w Qa � Z J cn o W M d c" C j U Q y x LJJ cm y o J V J a � z c' z o I— ..: o U W c-3 x x W d Q en DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This Page Intentionally Left Blank DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 TABLES DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-96OD-E2D8B83DD408 SMITH GARDNER TABLE 1 Avery County Closed MSW Landfill Landfill Gas Collection and Control System Monitoring September 2021 DATE: October 6, 2021 BY: SCR Device10 Date/Time CH4 CO2 02 Balance Init. Temperature Init. Static Pressure Adj. Static Pressure Init. Diff. Pressure* Init. Flow Adj. Flow System Pressure mm/dd/yyyy % % % % deg F in H2O in H2O in H2O Scfm Scfm in H2O AVERY-W1 9/22/2021 71.8 26.8 0.3 1.1 76.2 -33.66 -33.7 0.009 0.3 2 -32.99 AVERY-W2 9/22/2021 79.7 19 0.1 1.2 81.9 -1.16 -1.18 -0.013 0 0 -0.86 AVERY-W3 9/22/2021 72.2 27.1 0 0.7 74.3 -33.39 -33.48 0.233 1.6 1.6 -32.88 AVERY-W4 9/22/2021 57.5 14.8 4.7 23 82.1 -5.56 -5.63 0.018 4.7 4.9 -4.98 AVERY-W5 9/22/2021 32.4 20 5.9 41.7 75.1 -23.48 -23.48 0.52 2.3 2.3 -23.47 AVERY-W6 9/22/2021 9 15.3 6.3 69.4 79.3 -33.93 -33.91 0.045 12.1 12.1 -33.65 AVERY-W7 9/22/2021 68.1 31.2 0.2 0.5 74.6 -0.14 -0.14 -0.021 0 0 -0.1 AVERY-W8 9/22/2021 7.5 17.1 3.9 71.5 72.8 -3.98 -4.32 0.763 54 52.5 -3.42 AVERY-W9 9/22/2021 28 25.7 0.5 45.8 75.6 -33.63 -33.7 0.021 4.2 3.7 -33.4 VERY-W10 9/22/2021 48.2 24.8 4.9 22.1 77.2 -31.58 -31.8 0.011 3.1 3.4 -26.44 LAAv-Flare ik 14.3 10.9 10.9 i3.9 79.5 3.89 3.88 -1.064 0 0 3.65 *The differential pressure measurement should be positive. A negative differential pressure may indicate no gas flow. Negative differential pressure can be the result of dirt or water obstructing the pitot tube perforations. Overpulling by adjacent extraction wells may also result in negative pressure being displayed. NR= not recorded DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 ATTACHMENT 1 PERIMETER MONITORING PROBE DATA DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 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). FacilityName: Arj g9Lkf-&P[Q,4eLdlM§ L990filLandf ill Permit Number: 06 Al-01 Date of Sampling: 9/22/2021 NC Landfill Rule (.0500 or .1600): .050@500 Name and Position of Samnle Collector- Michael J. Liebl, Staff Environmental Technician Type and Serial Number of Gas Meter: GEM5000, G506472 Date and Time of Field Calibration: 9/22/2021, 0938 Calibration Date of Gas Meter: 12/2020 Type of Field Calibration Gas (15115 or 35/50): 35/15 Expiration Date of Field Calibration Gas Canister: N/A Pump Rate of Gas Meter: 0.5 LPM Ambient Air Temperature: 64 F Barometric Pressure: 27.13 in Hg General Weather Conditions: Overcast/Rain 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 Location or LFG Well ID Sample Tube Purge Time Time fi--raped (s) InitW o/iiLEL Stabilized %LEL 11/XH4 by Volume %0_2 °/OCG2 Notes H 2S p p m P-1 >60s 1141 >60s 0 0 0.0 14.6 7.1 0 P-2 >60s 1147 >60s 0 0 0.0 19.4 0.6 0 P-3 >60s 1152 >60s 170 170 8.5 12.7 3.3 2 P-4 >60s 1200 >60s 0 0 0.0 19.2 0.2 0 P-5 >60s 1127 >60s 0 0 0.0 18.1 2.9 0 P-6 >60s 1118 >60s 0 0 0.0 14.3 4.7 1 P-7 >60s 1113 >60s 226 226 11.3 15.1 14.6 2 P-8 >60s 1102 >60s 2 2 0.1 17.2 1.3 0 P-9 >60s 1213 >60s 0 0 0.0 19.3 0.2 0 P-10 >60s 1217 >60s 0 0 0.0 19.0 1.1 0 P-11 >60s 1206 >60s 0 0 0.0 16.5 5.8 2 P-12 >60s 1105 >60s 0 0 0.0 18.6 1.0 0 P-13 >60s 1226 >60s 0 0 0.0 19.1 1.7 0 Airport Structures >60s 1232 >60s 0 0 0.0 20.2 0.1 0 If your facility has more gas monitoring locations than there is room on this form, please attach additional sheets listing the same information as contained on this form. 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. DocuSigned by: Mil � SIGNATURE Staff Environmental Technician TITLE DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 ATTACHMENT 2 HISTORICAL PERIMETER MONITORING PROBE TRENDS DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank. DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 M11111stMA11,111V % CH4 by Volume 80.0 70.0 60.0 50.0 40.0 30.0 Installation of W9/P3 Connection Installation of P7/W8 (Se tember 11, 2014 and P1/W10Connection P (September 3, 2015) Avery County MSW Landfill Landfill Gas Monitoring Well Network Methane Concentrations Between January 2014 and September 2021 By: MJL Date: 9/24/2021 20.0 10.0 0.0M4 Or i Ln� i Ln ' N Ln Ln l0 W i W 4W W W W l0 l0 I, n i r, ' n n n n n n W W ' i 01 Q1 Q1 Q1 Q1 Q1 01 O O i O ' O O O O O O r-I r-I i ri rl ri rl ri r-I c-I a --I c-I r-I c-I a --I c-I r-I �' a --I c-I a --I c-I r-I c-I a --I c-I r-I �' a --I c-I a --I c-I r-I c-I r-I c-I r-I �' r-I c-I r-I c-I r-I -1 ri c-I L 0�0 T 00 j 00 a�-I r-I �' a --I c-I a --I c-I r-I -, N N N ? N N N N N N N N N N N N N f6 O fC O fC O fC O fC O c4 fC O fC � O fC c��gc�onQzbc�g��conQzbc�g02c�coQ�zbc�g�gc�aoQzbc�g�gc560CL zuC-0 c�coCL zuC-0 c—txoCL uC-0 c—aoQ LL Q �,n0 0 �LL Q �,n0 Q -LL Q (vn0 C roLL Q Ln C roLL Q - Ln 0 9LL Q �,n0 0 gLL Q� 5� v) 0 roLL Q� �� Ln Q Q Q Q Q Q Q Q P1 Well �P3 P7 DocuSign Envelope ID: 1AF90055-943B-4D73-960D-E2D8B83DD408 This page intentionally left blank.