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Home My WebLink About0601_AveryCounty_MSWLF_Nov21LFG_FID1636403_20220110DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E SMITH{ GARDNER ENGINEERS January 10, 2021 Ms. Jaclynne Drummond NCDENR DWM Solid Waste Section 2090 U.S. 70 Highway Swannanoa, North Carolina 28778-8211 ABBRESS TEL WEB 14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com RE: Operations, Monitoring, and Maintenance Report — November 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 November 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 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 flare, and associated valves and gauges. Well field and flare station data are provided in the attached Table 1. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E Ms. Drummond January 10, 2022 Page 2of4 LFG Extraction Well Field • W-1 through W-10: S+G performed methane (CH4), oxygen (02), and carbon dioxide (CO2) monitoring as well as temperature and pressure monitoring. In general, gas quality varies across the wellfield. All wells with the exception W-10 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 WELL (PERIMETER) 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 detectable landfill gas concentrations: • P-1 • 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 6.8% this month. This is above the LEL, but is lower than the past two monitoring events. 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 probe, P-11, which is located further from the waste near P-3 did not have detectable concentrations of methane. Monitoring probe P-12 is located downstream of P-7, and historically has not indicated the presence of methane; however, it was discovered last month that the well casing was struck by a fallen tree. Although the casing of P-12 is now angled due to a fallen tree, it is able to be monitored and LFG readings were normal with no indication of methane. In addition to damage to P-12, probe P-7 was damaged with the lid broken off. The lid to P-7 was repaired during the November event. The remaining perimeter monitoring probes generally do not have detectable concentrations of methane, with the exception of P-1 which had 0.4% methane (8% of the LEL) during this event. 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 DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E Ms. Drummond January 10, 2022 Page 3of4 present. Monitoring of the current well network will continue, and data will be reported to NCDEQ and the County. CONCLUSIONS In general, the landfill gas extraction system continues to operate nominally. W-10 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 December 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. \`��pit�nnurrrrrii CARo, P DocuSignedby: SEAL 1/10V2032 046707 58B13721B7E5F488... S-13 .� a � Spencer W. Hollomon, P.E. `•FNGINe ....Ho�\\��. Project Engineer, ext. 134 ��rfrrrriliin�4u„`� sspencer(dsmithgardnerinc.com Attachments cc: Eric Foster - Avery County file DocuSigned by: B9779EBA711F488... A 1R0 o�` " 2 ,SEAL 9 1369 1/1 /2 2 Joan A. Smyth, P.G. fir,^', Senior Hydrogeologist ext. 0oanfdsmithgardnerinc.com H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitoring\MSW\2021\11 November 2021\November 2021 Avery MSW LFG Monitoring Report.docx �k0�` A. �. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E Ms. Drummond January 10, 2022 Page 4of4 This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E FIGURES DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E I .►.I� — It. r I • . r ABANDONED SCALEHOUSE IUILPING 74 / EMQVED Q• P8 +- 1� I +* P111, 2 • A n7 R P� � STORMWATER DRAINAGE SYSTEM IN THIS AREA T( Qr urwuTADM ■".1-1 7 Lot O ■ #i 1• • y• + r CIE ! �* w r 'oil r.- Ap� y dip df lop ,� *fit•' � 6 �,. -7,/ ,,�J � r� et /)P dw Ir V LANDFILL or a �r 12 . , or �! •� A LEGEND dF ' 1 • . 04 0 EXISTING LANDFILL GAS PROBE Ink • +• (@ 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 O m w w z z a W � J O U-) a Z Lu U C U Q G W O Qa � Z J cn o W � d C/7 C j U Q >— y x cm y o J V J a z c' z G U W c-3 x x W d Q y DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This Page Intentionally Left Blank DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E TABLES DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E SMITH GARDNER TABLE 1 Avery County Closed MSW Landfill Landfill Gas Collection and Control System Monitoring November 2021 DATE: December 6, 2021 BY: MA 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-WI 11/23/2021 73.1 26.8 0.1 0 36.1 -35.85 -35.92 0.18 1.5 1.1 -35.67 AVERY-W2 11/23/2021 80.6 18.2 0.4 0.8 41.5 -3.03 -3.04 0.023 0.6 0.6 -2.79 AVERY-W3 11/23/2021 72.9 27.1 0 0 43.1 -35.64 -35.76 0.177 1.5 1.9 -35.67 AVERY-W4 11/23/2021 45.6 12.7 4.1 33.1 44 -7.47 -7.52 -0.004 «» «» -6.71 AVERY-W5 11/23/2021 40.6 26.3 1 0.6 32.5 44 -26.04 -26.1 0.678 2.7 1 2.7 -26.06 AVERY-W6 11/23/2021 8 15 3.4 69.9 62 -36.61 -36.62 0.027 9.4 9.1 -36.61 AVERY-W7 11/23/2021 68.8 29.5 0.2 1.5 62.3 -0.32 -0.35 -0.005 0 0 -0.32 AVERY-W8 11/23/2021 6.9 17.2 4.9 71 42.5 -4.01 -3.92 0.007 5.1 3.6 -3.72 AVERY-W9 11/23/2021 32.4 22.3 0.1 45.2 36.8 -36.06 -36.09 -0.016 «» «» -35.85 AVERY-W10 11/23/2021 9.6 5.3 17.1 68 41.1 -35.77 -35.88 -0.028 «» «» -35.9 Av-Flare 11/23/2021 14 1 11.6 13.7 60.7 1 46.5 1 2.05 1 2.04 1 -1.929 0 0 1 2.02 *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: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E ATTACH MENT 1 PERIMETER MONITORING PROBE DATA DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E 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-o 1 Date of Sampling: 11/23/2021 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: 11 /23/2021, 1008 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: 48 F Barometric Pressure: 27.27 in Hg General Weather Conditions: Sunny 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 %LF-L 11/XH4 by Volume %0_2 °/OCG2 Notes H 2S p p m P-1 >60s 1435 >60s 8 8 0.4 15.1 6.4 0 P-2 >60s 1439 >60s 0 0 0.0 18.6 3.1 2 P-3 >60s 1444 >60s 82 82 4.1 15.3 0.8 0 P-4 >60s 1448 >60s 0 0 0.0 16.4 1.9 0 P-5 >60s 1422 >60s 2 2 0.1 19.7 0.2 0 P-6 >60s 1414 >60s 0 0 0.0 17.2 4.7 0 P-7 >60s 1409 >60s 136 136 6.8 11.5 12.6 1 P-8 >60s 1402 >60s 0 0 0.0 13.9 5.9 0 P-9 >60s 1458 >60s 0 0 0.0 18.8 1.2 0 P-10 >60s 1502 >60s 0 0 0.0 18.4 0.7 0 P-11 >60s 1453 >60s 0 0 0.0 15.1 6.2 0 P-12 >60s 1406 >60s 0 0 0.0 16.8 14.2 0 P-13 - - - - - - - Inaccessible, active construction Airport Structures Inaccessible, active construction 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: Hze" tuu SIGNATURE Staff Environmental Technician TITLE DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E ATTACHMENT 2 HISTORICAL PERIMETER MONITORING PROBE TRENDS DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank. DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E SMITH GARDNER % CH4 by Volume 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 By: MJL Date: 12/6/2021 Avery County MSW Landfill Landfill Gas Monitoring Well Network Methane Concentrations Between January 2014 and November 2021 ��zt ZT -,tv-;tLnLnLn Ln Ln Ln Ln Ln M Ln ML.0'.ototo W A.0 W LO k.0 W W r, ,l,l, 1,1,1,1,1,1,1,00000000 000000000000000)rn0)rn a,arn0)rne,rnrn0000 0000000-4-4-1-4 -4-1-1-4-1 c-I c-I r-I ci rl i--I ri ri ri ci ri ri ri c-I r-I r-I c-I r-I r-I a --I ci ri rl ri ci r-I r-I ci rl ri a --I r-I r-I a --I a --I r-I r-I r-I ci rl ri a --I r-I r-I r-I a --I r-I r-I ci c-I r-I r-I r-I ci ri ri ri -I �--I �--I c-I a --I .-i .--I i--I �--I N r.4 N N ro N N N N N N N N N N N N N N N N N C- C bA Q +' > U C: -0 i i C bA 0-+' > U C-0 i i C bA Q +' > U C-0 i i C W 0-+' > U C-0 i i C W C)-+' > U C-0 L i C W 0-+' > U C-0 L i C bA 0-C +' > U -0 L i C W Q +' > v Q � D v 0 v M v Q� z = v 0 v M v Q� = D v 0 W M v Q z D W 0 a, M y Q� = � W" 0 v M v Q� = z v 0 a� M y Q� = � v 0 v m v Q� = z v 0 ,Lga QLn0z0-Lga QLn0Z0-LL < QLn0Z0-LL < QLn0Z -LL < QLn0zp-La Qun0zo,Lga Q(AOz0-- LL < < n0z P1 Well P3 P7 DocuSign Envelope ID: B328A9F4-9428-46C0-8CEE-D099BFD1523E This page intentionally left blank.