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Home My WebLink About0601_AveryCounty_LFG_DIN28234_20170515 May 18, 2017 Ms. Jaclynne Drummond NCDENR DWM Solid Waste Section 2090 U.S. 70 Highway Swannanoa, North Carolina 28778-8211 RE: Operations, Monitoring, and Maintenance Report –May 2017 Avery County Closed MSW Landfill Spruce Pine, North Carolina Dear Ms. Drummond: Smith Gardner, Inc. (S+G) is pleased to present this report concerning the operation and maintenance (O&M) of the Avery County Closed MSW Landfill (Permit No. 06-01) Landfill Gas Collection and Control System (LFGCCS). Monitoring of the on- and off-site landfill gas probes was also performed. Mr. Frank Terry with S+G performed the site visit on May 15-16, 2017. Site visit details are provided below. LFG EXTRACTION WELL MONITORING PROGRAM Monthly monitoring of the LFGCCS will continue and shall include the following items: • CH4, O2, CO2, and pressure monitoring at each extraction well head; • CH4, O2, CO2, and pressure monitoring at the flare station; and • Adjustment of the LFGCCS to balance recovery and ensure safe system operation. The County will maintain this LFGCCS and will continue to evaluate the effectiveness of increased LFG recovery from the waste mass in alleviating off-site LFG migration. Results from monthly monitoring events will be reported in accordance with the approved LFG Monitoring Plan. LFG EXTRACTION WELL MONITORING ACTIVITIES Mr. Terry performed the flare station and well field monitoring on May 15-16, 2017. Initial measurements indicated there was approximately 32 inches of available vacuum at the vacuum blower inlet, ranging from approximately 29 inches of available vacuum at each of the LFG wells across the well field. The results from this event are summarized below. Recommended actions are underlined. Well field data and flare station data are provided in the attached Table 1. Ms. Drummond May 18, 2017 Page 2 of 3 LFG Extraction Well Field • W-1 through W-10: S+G performed methane (CH4), oxygen (O2), carbon dioxide (CO2), and pressure monitoring. No wellhead valves adjustments were required during this sampling event. • Orifice Plates: S+G continues to evaluate orifice plate sizes at wells W-5, W-7, W- 9, and W-10 during each site visit. As LFG flow potential at these locations remains stable, the correct orifice plate sizes are currently installed. Flare Station • Condensate Tank: The condensate tank was observed during this site visit; the liquid was at an acceptable level. S+G will continue to monitor the liquid level of the condensate tank. • Filter Tank: The filter tank was observed during the site visit and the liquid level was found to be at a normal level. S+G will continue to monitor the liquid level of the filter tank. • Flare operation: Due to low concentrations of methane measured at the flare combustion was not observed. The spark generator was operational; however, attempts manually ignite the flare were unsuccessful. S+G will continue to adjust the system to optimize gas flow and quality. LFG MONITORING WELL (PERIMETER) MONITORING PROGRAM Mr. Terry performed monitoring of the perimeter LFG monitoring network during this event. Monitoring Wells P-1, P-3, P-7, P-8, P-12, and P-13 exhibited CH4 concentration readings of 4.8%, 2.2%, 2.5%, 0.1%, 0.1%, and 1.9% respectively which do not exceed the LEL of 5%. The other wells, monitored during this event, had no detectable concentrations of CH4. Results of this monitoring event are included in Attachment 1. Attachment 2 provides a CH4 concentration graph over time for monitoring wells that have historically had methane present. The current well network will continue to be monitored and data will be reported to NCDEQ and the County. CONCLUSIONS The site has been generally characterized by a trend of consistently decreasing LFG concentrations and flow rate. Methane concentrations have increased slightly from the April 2017 monitoring event in several probes during this monitoring event. We will continue to monitor the CH4 concentrations at the site monthly. Ms. Drummond May 18, 2017 Page 3 of 3 The next routine monitoring event is scheduled for June 2017. 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. Frank Terry Madeline German, P.G. Project Manager, ext. 142 Project Geologist ext. 222 frank@smithgardnerinc.com madeline@smithgardnerinc.com Attachments cc: Eric Foster – Avery County Deb Aja – NCDEQ file H:\Projects\Avery County (NC)\Avery-15-1 (LFG Sys Ops)\2017 LFG Monitoring\5 May 2017\Avery Co MSW LFG Monitoring Rpt May 2017.docx This page intentionally left blank. FIGURE This page intentionally left blank. 0 2 0 0 ' 4 0 0 ' 123 456 4 G:\CAD\Avery County\Avery 13-6\sheets\AVERY-B0216.dwg - 12/3/2013 11:03 AM Th i s P a g e I n t e n t i o n a l l y L e f t B l a n k TABLE This page intentionally left blank. DATE: BY:FAT Date/Time CH4 CO2 O2 Balance Init. Temperature Init. Static Pressure Adj. Static Pressure Adj. 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 5/15/2017 15:07 72.5 27.2 0.3 0.0 81 -29.1 -29.1 0.0 NR NR -29.5 AVERY-W2 5/15/2017 15:00 52.2 26.4 0.4 21.0 70 -28.9 -29.1 0.0 0.0 8.6 -29.7 AVERY-W3 5/15/2017 14:54 66.3 28.6 0.5 4.6 75 -28.8 -28.8 0.0 0.0 0.0 -29.7 AVERY-W4 5/15/2017 14:58 61.5 26.9 0.1 11.5 88 -28.9 -28.8 0.0 3.0 1.1 -29.7 AVERY-W5 5/15/2017 15:13 3.2 11.9 8.3 76.6 86 -6.4 -6.4 2.8 1.3 1.3 -29.6 AVERY-W6 5/15/2017 15:16 32.0 23.8 0.5 43.7 77 -28.2 -28.2 0.5 2.0 2.1 -29.4 AVERY-W7 5/15/2017 15:22 55.8 34.0 0.5 9.7 88 -29.1 -29.1 0.0 7.9 8.4 -29.7 AVERY-W8 5/15/2017 15:05 67.7 28.9 0.4 3.0 90 -29.1 -29.1 0.2 0.1 0.3 -0.1 AVERY-W9 5/15/2017 14:51 65.7 31.3 1.0 2.0 90 -28.8 -28.8 0.0 0.1 0.1 0.0 AVERY-W10 5/15/2017 15:53 12.0 9.7 12.8 65.5 60 -31.8 -32.0 32.4 NR NR 0.0 AV-FLARE 5/15/2017 15:53 12.0 9.7 12.8 65.5 60 -31.8 -32.0 32.4 NR NR 0.0 NR= not recorded Landfill Gas Collection and Control System Monitoring May 2017 *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. May 17, 2017 Avery County Closed MSW Landfill TABLE 1 Device ID This page intentionally left blank. Attachment 1 This page intentionally left blank. 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: ____________________________ Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________ Name and Position of Sample Collector: _________________________________________ Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________ Date and 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: _____________ 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 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. __________________________________ ________________________ SIGNATURE TITLE 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: ____________________________ Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________ Name and Position of Sample Collector: _________________________________________ Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________ Date and 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: _____________ 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 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. __________________________________ ________________________ SIGNATURE TITLE Attachment 2 This page intentionally left blank. By:FAT Date:5/17/2017 Avery County MSW Landfill Landfill Gas Monitoring Well Network Methane Concentrations Between May 2011 and May 2017 0 10 20 30 40 50 60 70 No v - 1 1 De c - 1 1 Ja n - 1 2 Fe b - 1 2 Ma r - 1 2 Ap r - 1 2 Ma y - 1 2 Ju n - 1 2 Ju l - 1 2 Au g - 1 2 Se p - 1 2 Oc t - 1 2 No v - 1 2 De c - 1 2 Ja n - 1 3 Fe b - 1 3 Ma r - 1 3 Ap r - 1 3 Ma y - 1 3 Ju n - 1 3 Ju l - 1 3 Au g - 1 3 Se p - 1 3 Oc t - 1 3 No v - 1 3 De c - 1 3 Ja n - 1 4 Fe b - 1 4 Ma r - 1 4 Ap r - 1 4 Ma y - 1 4 Ju n - 1 4 Ju l - 1 4 Au g - 1 4 Se p - 1 4 Oc t - 1 4 No v - 1 4 De c - 1 4 Ja n - 1 5 Fe b - 1 5 Ma r - 1 5 Ap r - 1 5 Ma y - 1 5 Ju n - 1 5 Ju l - 1 5 Au g - 1 5 Se p - 1 5 Oc t - 1 5 No v - 1 5 De c - 1 5 Ja n - 1 6 Fe b - 1 6 Ma r - 1 6 Ap r - 1 6 Ma y - 1 6 Ju n - 1 6 Ju l - 1 6 Au g - 1 6 Se p - 1 6 Oc t - 1 6 No v - 1 6 De c - 1 6 Ja n - 1 7 Fe b - 1 7 Ma r - 1 7 Ap r - 1 7 Ma y - 1 7 Ju n - 1 7 P1 P3 P7 P11 P12 P13 Well % CH4 by Volume Installation of W9 and W10 (April 30, 2013) Installation of W9/P3 Connection (September 11, 2014 Installation of P7/W8 and P1/W10 Connection (September 3, 2015) Th i s p a g e i n t e n t i o n a l l y l e f t b l a n k .