The URL can be used to link to this page

Home My WebLink About0601_AveryCounty_MSWLF_May20LFG_FID1423079_20200714DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 SMITH GARDNER ADDRESS TEL WEB 14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com July 14, 2020 Ms, Jaclynne Drummond NCDENR DWM Solid Waste Section 2090 U.S. ?0 Highway Swannanoa, North Carolina 28??8-8211 RE: Operations, Monitoring, and Maintenance Report — May 2020 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. 06-011 Landfill Gas Collection and Control System (LFGCCS), and the perimeter monitoring probes for May 2020. 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 wells 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: 84777617-7154-4D3F-9E53-8D6967B259D5 Ms. Drummond July 14, 2020 Page 2of4 LFG Extraction Well Field • W-1 through W-10: S+G performed methane (CH4), oxygen (02), carbon dioxide (CO2), and pressure monitoring. Available vacuum at each wellhead across the system was observed to range from 30 to 35 inches of water. Flare Station During this site visit the flare was down for maintenance to replace the ignitor, so no flow readings at the flare were obtained. Concentrations of gases were recorded and there appears to be an increase in oxygen concentration from what is observed in the wellfield, to what is read at the flare. The cause of this increase will be investigated and repaired as necessary in upcoming events. 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. Results indicate P-3 and P-7 had an exceedance of the LEL. Both P- 3 and P-7 are located on the landfill property, with P-3 located generally north of the landfill and P-7 located generally southwest of the landfill. P-3 was observed to have a concentration of methane greater than the previous month, while P-7 was observed to decrease in concentration. The cause of the spike in P-3 is unknown but may be related to ongoing maintenance of the LFGCCS. The concentration in this well will continue to be monitored for any changes. 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. CONCLUSIONS In general, the landfill gas extraction system continues to operate nominally. S+G will continue to monitor the methane concentrations at the site monthly, and advise the County on repairs required to maintain an effective collection system. The next monitoring event is scheduled for July 2020. 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). DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 Ms. Drummond July 14, 2020 Page 3of4 Sincerely, SMITH GARDNER, INC. OtUN1util111rrrri DocuSigned by: • QP �` • :: �i E ^ SEAL 046707 z SB13721B7E5F488... `d O S r' S Spencer W. Hollomon, Project Engineer, ext. 134 w;�> y o\zo spencerlasmithgardnerinc.com �Rl1r Attachments cc: Eric Foster -Avery County file ?I DocuSigned by: '__S'�� 6 - Q B9779EBA711F488... Joan A. Smyth, P.G. 4 Senior Hydrogeologist ext. ioan(dsmithgardnerinc.com EN FO SEAL 1369 A. '9zozo H:\Projects\Avery County (NC)\02 AC Compliance\LFG Mon itoring\MSW\2020\05 May 2020\May 2020 Avery MSW LFG Monitoring Report.docx DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 Ms. Drummond July 14, 2020 Page 4of4 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 FIGURES DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 or 4 1• ti 41 .. . # :07 Ow �� r 1 + .� i • .* • kit Mo. O ■ #i Po- 1• . y• + r CIE ! �* w r \O.� AR- go 'oil r.- I ir 4' i •.' • M '�• t y ,� *fit•' � 6 �,. -7,/ ,,�J � r� roc 1167 r . 0 br f . • 1 w ♦. / ' • *. sr a . • "` -InAVERY COUNTY .!" �► #. V LANDFILL s 4w or a �r 1 1- � . ,,�, �! •� � LEGEND � • TN • 1 • . 0 EXISTING LANDFILL GAS PROBE d®r +• ® 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. �•�411F 00 0 N 0 m w w z z a w � J O U-) a o � Z 1u U > C G w Q o Qa � Z J cn C= W � d CJ7 CCC,, OW U Q Cn x cm Cn C= J V J a � z c' z o g- a C= V W >— c.3 rr x W d Q CJ7 DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This Page Intentionally Left Blank DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 TABLES DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 AIII1IQH�1Oki 11�1I►� - 9 9.30 9 • EAE July 13, 2020 EN Sw~ Chi ce I D D te'Trre 0-4 CC'P C2 Ebam Iryt.Terrpe-ahre Irit.3atic R�essae A4.3atic F tess<.re Irit. Dff. F tess<.re* ht. F oN A4. FoN �� Ressl-re M-d CtV yyyy % % % % deg F i n 1 0 i n 1 0 i n F20 31m 31m i n F20 AVERY- W1 5/ 22/ 2020 12:12 59.2 24.1 1.7 6 74.3 - 34.89 - 34.96 - 0.224 0 0 - 34.75 AVERY- W2 5/ 22/ 2020 12: 22 55.8 19.8 6.8 6 73.7 - 34.45 - 34.61 - 0.072 0 0 - 34.91 AVERY- W3 5/ 22/ 2020 12: 27 49.3 21.3 3.6 7 70.3 - 34.42 - 34.52 0.066 1.9 2.9 - 34.91 AVE RY- W4 5/ 22/ 2020 12: 39 61.1 15.5 4.7 33 77.4 - 2.24 -19.44 0.298 46.5 46.8 - 33.21 AVERY-W5 5/22/202013:06 70.8 25.9 0.5 8 74.8 0.48 -12.94 -0.312 0 18.1 -33.03 AVERY-W6 5/22/202012:58 67.8 29.4 0.4 13 83.1 0.12 0.2 0.313 46.4 45.5 -33.79 AVERY-W7 5/22/202012:52 60 26 0.5 10 78.1 -0.99 -11.55 -0.282 0 N/A -33.98 AVERY- W8 5/ 22/ 2020 12: 48 31.3 26.1 0.6 7 76.1 - 34.5 - 34.46 0.307 41 40.2 - 34.47 AVERY- W9 5/ 22/ 2020 12:17 45.4 24.3 0.3 18 79.8 - 35.18 - 35.2 0.292 10.3 10.2 - 34.99 AVERY-W10 5/22/202012:31 27.2 13 11.2 27 78.4 -27.34 -25.28 0.291 10.3 10.3 -35.24 Av-Flare 5/22/202013:11 16.9 6.4 13.7 8 78.9 1.67 1.68 1.947 IN IN IN *The differential pressure measurement should be positive. A negative differential pressure may indicate no gas flow. Negative differential pressure can bethe result of dirt or water obstructing the pitot tube perforations. OverpuIIing by adjacent extraction wells may also result in negative pressure being displayed. NR= not recorded DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 ATTACHMENT 1 PERIMETER MONITORING PROBE DATA DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 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: Arig,9Ltf&P[Q?eLdlM§ L990filLandfill Permit Number: 06Al-o1 Date of Sampling: 05/22/2020 NC Landfill Rule (.0500 or .1600): .050@500 Name and Position of Sample Collector: Spencer W. Hollomon, Project Engineer Type and Serial Number of Gas Meter: GEM 5000 Date and Time of Field Calibration: 05/22/2020 830 Calibration Date of Gas Meter: 1/2020 Type of Field Calibration Gas (15115 or 35/50): 15/15 Expiration Date of Field Calibration Gas Canister: 10/2020 Pump Rate of Gas Meter: 0.5 LPM Ambient Air Temperature: 62 F Barometric Pressure: 27.88 inHg General Weather Conditions: Clear 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 P--nped (s) InitW o/uLEL Stabilized 01nLFL 11/XH4 by Volume %0-2 %CG2 Notes H 2 S (p p m ) P-1 >60s 1201 >60s 0 0 0 19.4 0.1 3 P-2 >60s 843 >60s 2 2 0.1 20.2 0.4 0 P-3 >60s 852 >60s 270 270 13.5 8.9 11.8 0 P-4 >60s 856 >60s 0 0 0.0 18.8 1.9 0 P-5 >60s 937 >60s 0 0 0.0 19.5 1 0 P-6 >60s 1011 >60s 0 0 0.0 20.5 0.3 0 P-7 >60s 1147 >60s 142 142 7.1 0.4 8.6 3 P-8 >60s 1154 >60s 0 0 0.0 19.2 0.7 3 P-9 >60s 1326 >60s 0 0 0.0 18.3 1.1 4 P-10 >60s 1323 >60s 0 0 0.0 9.5 6.9 4 P-11 >60s 1331 >60s 0 0 0.0 19.8 0 4 P-12 >60s 1150 >60s 0 0 0.0 19.2 0 3 P-13 >60s 1338 >60s 0 0 0.0 10.8 1.2 4 Airport Structures >60s 1344 >60s 0 0 0.0 20.8 0.0 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. Project Engineer, S+G SIGNATURE TITLE DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 ATTACHMENT 2 HISTORICAL PERIMETER MONITORING PROBE TRENDS DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This page intentionally left blank. DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 SMITH GARDNER % CH4 by 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 Installation of W9/P3 Avery County MSW Landfill Landfill Gas Monitoring Well Network Methane Concentrations Between January 2014 and May 2020 By: SWH Date: 7/ 13/2020 0.0 :Tr—ram:—_� ,ct ct ' -t -,t zt v to to Ln Ln Ln Ln to to to �.o I.D io ` 1,0 kD �.O k.D to LO r` r� r, r` r, 00 00 00 00 00 00 00 00 00 rn rn am rn rn rn am 0) 0) 0 0 0 0 0 0 0 0 0 `6 co O L 1-1 r-I r-I r-O> ri ri rir-I r-I r-I r-I O> r-1 rI L > N li O O O Oc -CS c n a u r--0c 5 Up a uc-0 c to a b r--0c n 0- z u r--0C do a- z u r--0c tw a b r--0c n a- z pu Q-< OQO,<op°i -,<np6i -,<o rtO<op6i -,<Ami -,<oI a o O 0 i , a O tQ , a O iQ , a tO ti Q a O LQ , a Li O 1Q , a t00 DocuSign Envelope ID: 84777617-7154-4D3F-9E53-8D6967B259D5 This Page Intentionally Left Blank