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Home My WebLink About6401_NashCoMSWLFQtr4_GWMR_20171115 1100 Crescent Green Drive, Suite 208 • Cary, North Carolina 27518 • O: 919-792-1900 • F: 866-311-7206 December 18, 2017 Mr. William W. Hill, Jr., M.P.H. - Health Director Nash County Health Department P. O. Box 849 Nashville, NC 27856 RE: Results of Landfill Gas Monitoring – November 2017 Nash County Municipal Solid Waste Landfill Nashville, Nash County, North Carolina Permit # 64-01 Dear Mr. Hill: This letter presents the results of landfill gas monitoring conducted at the site referenced above on November 14, 2017. Landfill gas was monitored using a calibrated GEM-2000 landfill gas monitor at the on-site gas monitoring probes, as well as within the on-site structures and within the crawl space of a private residence located on an out parcel approximately 350 feet east of the facility. A site map showing the locations of the landfill gas monitoring probes is attached. The results of monitoring at each of the gas monitoring probes are summarized in the attached Landfill Gas Monitoring Data Forms. The landfill gas reading at GP-7 was greater than 100% of the lower explosive limit (LEL). The methane reading at GP-7 was 11.7%. The % LEL and methane readings measured at this gas monitoring probe is indicative of soil gas conditions proximal to the buried waste. Moreover, access to the site in the vicinity of this probe is restricted to trained landfill personnel who are aware of these conditions. Methane was not detected in excess of the LEL at any of the remaining gas monitoring probes, within the on-site structures, or within the crawl space of the nearby private residence. The results of the November 2017 landfill gas monitoring are consistent with previous monitoring completed at the site, indicating that landfill gas is not migrating laterally away from the buried waste. Consequently, there does not appear to be an immediate risk associated with the migration of landfill gas at the facility. The next quarterly landfill gas monitoring event is scheduled for February 2018. If you have any questions or require further assistance regarding this matter, please do not hesitate to call me at 919-792-1904. Mr. William Hill December 18, 2017 Page 2 of 2 Sincerely, Garrett & Moore, Inc. Craig M. Fortner, P.E. Professional Engineer Cc: Jaclynne Drummond, NCDENR, Division of Waste Management, Solid Waste Section Ben Barnes – Solid Waste Director, Nash County 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: Nash County MSW Landfill (Closed) Permit Number: 64-01 Sampling Date: 11/14/17 NC Landfill Rule (.0500 or .1600): .1600 Sample Collector Name & Position: Isaac Hardison, EIT Gas Meter Type & Serial Number: GEM 2000 +, GM08230-05 Gas Meter Calibration Date: 11/14/17 Field Calibration Date & Time: 11/14/17, 9:45 AM Field Calibration Gas Type (15/15 or 35/50): 35/50 CO2 & CH4 ; 50/25 CO & H2S Field Calibration Gas Canister Expiration Date: 8/31/19 Gas Meter Pump Rate: NA Ambient Air Temperature: 47 ̊ F Barometric Pressure (in. or mm Hg): 29.89mm Weather Conditions: Sunny Instructions: Under “Location or LFG Well”, list monitoring well # or describe monitoring location (e.g., inside field office). Attach a test location map or drawing. Report methane readings as both % LEL and % CH4 by volume. Convert % CH4 (by volume) to % LEL as follows: % methane (by volume)/20 = % LEL. *Hydrogen Sulfide (H2S) gas monitoring may be required for Construction & Demolition Landfills (CDLFs). See individual permit conditions and/or Facility LFG monitoring plan. Location or LFG Well ID Sample Tube Purge Time of Day Time Pumped (sec) Initial % LEL Stabilized % LEL % CH4 (volume) % O2 (volume) % CO2 (volume) % H2S* (volume) NOTES GP-1S 1min 11:01 1min 0 0 0 13.7 5.4 0 GP-1D 1min 11:03 1min 0 0 0 11.7 8.3 0 GP-2S 1min 10:42 1min 0 0 0 14.4 6.8 0 GP-3S 1min 10:23 1min 0 0 0 16.5 2.9 0 GP-3D 1min 10:26 1min 0 0 0 15.8 3.8 0 GP-3RS 1min 10:30 1min 0 0 0 17.9 1.5 0 GP-3RD 1min 10:33 1min 0 0 0 18.7 0.6 0 GP-4RS 1min 10:16 1min 0 0 0 20.0 0.4 0 GP-4RD 1min 10:19 1min 0 0 0 20.1 0.2 0 GP-4S 1min 9:54 1min 0 0 0 12.7 6.1 0 GP-4D 1min 9:58 1min 0 0 0 3.9 13.3 0 GP-5S 1min 10:04 1min 0 0 0 15.1 7.5 0 NOTE: If needed, attach additional data forms to include additional LFG monitoring data locations for the facility. ACTION LEVELS: Methane: >1.25% by volume (inside structures) AND >5% by volume (at facility boundary) Hydrogen Sulfide: >1% by volume (inside structures) AND >4% by volume (at facility boundary) 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. Professional Engineer SIGNATURE TITLE Revised – November 17, 2017 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: Nash County MSW Landfill (Closed) Permit Number: 64-01 Sampling Date: 11/14/17 NC Landfill Rule (.0500 or .1600): .1600 Sample Collector Name & Position: Isaac Hardison, EIT Gas Meter Type & Serial Number: GEM 2000+, GM08230-05 Gas Meter Calibration Date: 11/14/17 Field Calibration Date & Time: 11/14/17, 9:45 AM Field Calibration Gas Type (15/15 or 35/50): 35/50 CO2 & CH4 ; 50/25 CO & H2S Field Calibration Gas Canister Expiration Date: 8/31/19 Gas Meter Pump Rate: NA Ambient Air Temperature: 47 ̊ F Barometric Pressure (in. or mm Hg): 29.89mm Weather Conditions: Sunny Instructions: Under “Location or LFG Well”, list monitoring well # or describe monitoring location (e.g., inside field office). Attach a test location map or drawing. Report methane readings as both % LEL and % CH4 by volume. Convert % CH4 (by volume) to % LEL as follows: % methane (by volume)/20 = % LEL. *Hydrogen Sulfide (H2S) gas monitoring may be required for Construction & Demolition Landfills (CDLFs). See individual permit conditions and/or Facility LFG monitoring plan. Location or LFG Well ID Sample Tube Purge Time of Day Time Pumped (sec) Initial % LEL Stabilized % LEL % CH4 (volume) % O2 (volume) % CO2 (volume) % H2S* (volume) NOTES GP-5RS 1min 10:10 1min 0 0 0 19.7 1.1 0 GP-5RD 1min 10:13 1min 0 0 0 16.7 3.8 0 GP-6S 1min 11:06 1min 0 0 0 8.4 12.0 0 GP-7 1min 10:50 1min 0 >>> 11.7 0.8 23.3 0 GP-7RS 1min 10:57 1min 0 0 0 18.9 1.8 0 GP-7RD 1min 10:54 1min 0 0 0 20.0 0.5 0 GP-8S 1min 10:46 1min 0 0 0 10.8 10.5 0 Scalehouse 1min 11:11 1min 0 0 0 20.7 0.0 0 Dwelling 1min 11:17 1min 0 0 0 20.6 0.0 0 GP-5D 1min 10:07 1min 0 0 0 11.1 8.2 0 NOTE: If needed, attach additional data forms to include additional LFG monitoring data locations for the facility. ACTION LEVELS: Methane: >1.25% by volume (inside structures) AND >5% by volume (at facility boundary) Hydrogen Sulfide: >1% by volume (inside structures) AND >4% by volume (at facility boundary) 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. Professional Engineer SIGNATURE TITLE Revised – November 17, 2017