Loading...
HomeMy WebLinkAbout0601_AveryCounty_MSWLF_Aug21LFG_FID1606498_20210830DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 SMITH- GARDNER ENGINEERS August 20, 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 — August 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 August 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 flare, and associated valves and gauges. Well field and flare station data are provided in the attached Table 1. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 Ms. Drummond August 20, 2021 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 flow and pressure monitoring. In general, gas quality has a wide variance across the wellfield. All wells with the exception of W-6 had recorded oxygen levels below 5% this sampling event. W-9 was repaired prior to this sampling event and its readings were normal. 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 (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 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 7.4% 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 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: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 Ms. Drummond August 20, 2021 Page 3of4 CONCLUSIONS In general, the landfill gas extraction system continues to operate nominally. 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 September 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. `�5`111f1111111f11/1/ N S A5 �'/i DocuSigned by:SEAL APO �` •• - ~ Es8B13721467078/za,�2zo1 KE5F488... 'Q ;'S0 Spencer W. Hollomon, P.E. O Project Engineer, ext. 134 ��,, W. \-1 1 g SDencer(dsmithaardnerinc.com Attachments cc: Eric Foster - Avery County file DocuSigned by: E bal� Q. SM4L B9779EBA711F488... CAR"0 N a SSFA, 9 1369 8/3 /2 1 Joan A. Smyth, P.G. Senior Hydrogeologist ext. ioan(asmithaardnerinc.com H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitoring\MSW\2021\08 August 2021\August 2021 Avery MSW LFG Monitoring Report.docx DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 Ms. Drummond August 20, 2021 Page 4of4 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 FIGURES DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51F31 ti or a rt ►fie r• 41 C• ■. . r AP + s• f" � L • ram. r �+� ��"`�+�+ �';e .'"�; �• • •* 1 y� + .� i • ARN v, • * . �''go ' - _; - - • O aR� .•,.tom * j401 or *—.;A M • i r a/ • 74 •ems i+ ` w, � " �� _�� -. + �• ������ � �•. �r� •,w . .' *A% -k 0 br f . NOR • mi • w .►�.� ' — •r Ir ! • . r ■".1-1 7 ♦. / ' • *�. r e et �. •AVERY COUNTY •� • dw �►01. V LANDFILL#. - �' •low , � •' I , fr or a �r 1 •- �' .. or �! •� A LEGEND • T� ' • . 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 •0 200' 0 N 0 m w w z z a w � J O U -) a Z 1u U > C U Q G w Qa � Z J cn o W M d C/7 C I--- = U Q y x cm y o J Lm J a c L z ' z o ..: a O U W >- c-3 x x W d Q en DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This Page Intentionally Left Blank DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 TABLES DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 SMITH GARDNER TABLE 1 Avery County Closed MSW Landfill Landfill Gas Collection and Control System Monitoring August2021 DATE: August '18, 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 8/5/2021 71.9 25.7 0.2 2.2 84.1 -23.8 -23.91 0.107 1.1 1.1 -23.26 AVERY-W2 8/5/2021 80.5 18.1 0 1.4 85.1 1.1 1.1 -0.009 0 0 0.87 AVERY-W3 8/5/2021 74.1 24.7 0 1.2 77.8 -23.15 -23.23 1.268 3.9 3.9 -22.88 AVERY-W4 8/5/2021 77.2 22 0 0.8 84.9 2.3 2.32 0.026 6 5.8 1.7 AVERY-W5 8/5/2021 60 27.9 1 0.8 11.3 84.5 -15.25 -15.37 0.453 2.2 1 2.2 -15.31 AVERY-W6 8/5/2021 15.9 12.7 5.1 66.3 79.1 -25.04 -25.05 0.04 11.9 11.9 -25.1 AVERY-W7 8/5/2021 51.6 19.4 0.1 28.9 91.3 0.03 0.03 -0.026 0 0 0.03 AVERY-W8 8/5/2021 32.6 18.6 1.1 47.7 80.2 -1.96 -1.89 0.028 10.3 10.5 -1.78 AVERY-W9 8/5/2021 60.1 29.6 0.1 10.2 77.3 -24.31 -24.34 0.008 2.7 2.9 -24.26 AVERY-W10 8/5/2021 50.4 23 4.6 22 80.3 -22.32 -22.91 0.012 3.3 3.6 -20.51 Av-Flare 8/5/2021 18.3 4.4 42.3 87.1 5.8 5.79 -2.434 0 0 5.96 r35 *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: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 ATTACH MENT 1 PERIMETER MONITORING PROBE DATA DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE5lF31 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: 8/5/2021 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: 8/5/2021, 1052 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: 79 F Barometric Pressure: 27.43 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 01nLEL 11/XH4 by Volume %0_2 "/6CG2 Notes H 2S p p m P-1 >60s 1216 >60s 0 0 0.0 17.3 3.1 0 P-2 >60s 1219 >60s 0 0 0.0 19.1 0.7 0 P-3 >60s 1224 >60s 124 124 6.2 15.2 4.6 1 P-4 >60s 1228 >60s 0 0 0.1 19.4 0.3 0 P-5 >60s 1207 >60s 0 0 0.0 19.2 1.6 0 P-6 >60s 1159 >60s 0 0 0.0 17.6 0.5 0 P-7 >60s 1155 >60s 148 148 7.4 3.8 12.2 9 P-8 >60s 1147 >60s 10 10 0.5 18.5 1.7 0 P-9 >60s 1241 >60s 0 0 0.0 19.0 0.1 0 P-10 >60s 1244 >60s 0 0 0.0 18.4 1.3 0 P-11 >60s 1236 >60s 0 0 0.0 18.9 3.4 2 P-12 >60s 1151 >60s 0 0 0.0 17.6 0.2 0 P-13 >60s 1255 >60s 0 0 0.0 17.9 2.8 0 Airport Structures >60s 1250 >60s 0 0 0.0 20.0 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: COFF2284CA504F5... SIGNATURE Staff Environmental Technician TITLE DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 ATTACHMENT 2 HISTORICAL PERIMETER MONITORING PROBE TRENDS DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank. DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 SMITH GARDNER % CH4 by Volume 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 I -_i_I I_i:__ _L\Alf) /fln Connection Installation of P7/W8 and P1/W10 Connection (September 11, 2014 (September3, 2015) _ 0.0 �v�� ���v���1n1n1n1n rLnLnLnu Lr)Lr) nI'o11o(.oiD rQ0lOtpID�DIDI0r-r-rl-1, 1-n1,n1,r1�00000000 00000000000000ornrna)a) ra,rnrnrnrnmm0000 `0000000rl"Irlrl "I"1-1 r-1 rl ci rl ci ci rl ri ri rl ri ri ri ci rl �' ri ci rl ri ri c-I r-I r-I r-I -I �--I �' .--I i--I i--I �--I �--I .--I i--I .--I i--I c-I .--I .--I i--I .--I i--I i--I .--I �--I �--I .--I c-I i--I �' .--I �--I i--I .--I .--I i--I i--I �--I �--I c-I i--I �' �--I c-I .--I r-I i--I i--I .--I N N N N T N N N N N N N N N N N N N N ro ro to tB , r C i i C W Q— > U C L L C bA Q +' > U C-0 i C to Q +-' > U C-0 i C W 0- +' > U C-0 L C w Q +' > U C-0 i C bA Q +-' > U C-0 L C- to Q +' > U C i C W ro v@ �� �_ � v U o a) (u v a� �_ � a, u o v ca v M 0� � v U o v ro v m a� = � v U o v ro v �� � v U o v M v D v U o v ca v 00 a� = D v U o v L.Q L Q —� Q !n O z —� LL Q — Q rn O z L.L 2 Q Q rn O z LL 2 Q — Q LA 1L O z Q Q rn O z 0 Q Q (A O z LL 2 Q Q rn O z 0 LvL Q ; Avery County MSW Landfill Landfill Gas Monitoring Well Network Methane Concentrations Between January 2014 and August 2021 By: MJL Date: 8/18/2021 P1 Well P3 P7 DocuSign Envelope ID: 73BF6FD6-AEC3-423F-A794-15B03DE51 F31 This page intentionally left blank.