9226_ShotwellCDLF_GWMR_20170515

ELM Site Solutions, Inc.
P. O. Box 97607 Raleigh, North Carolina 27624 Phone: [phone]
May 15, 2017
Submitted via electronic mail Ms. Jaclynne Drummond, PG Compliance Hydrogeologist North Carolina Department of Environmental Quality Division of Waste Management Solid Waste Section 1646 Mail Service Center Raleigh, North Carolina 27699-1646 RE: Landfill Gas Sampling Event Shotwell C&D Landfill Solid Waste Permit No. 92-26
Wendell, Wake County, North Carolina Dear Ms. Drummond:
This letter summarizes the recent sampling event completed at the above-referenced facility in accordance with Phase 4 of the Shotwell C&D Landfill Monitoring Plan (Garrett & Moore, May 2014). The Gas Control Plan in Appendix B of the referenced plan specifies that hydrogen sulfide, in addition to methane, be monitored at site landfill gas monitoring locations. These locations include LG-1 through LG-11 and the scale house. Field Methods ELM Site Solutions personnel mobilized to the site on April 28, 2017, to collect a full round of landfill gas measurements at the site gas monitoring well locations and the scale house. A calibrated Landtec GEM 2000 Plus gas meter was used to measure landfill gas at each sample location. After purging the instrument for at least 60 seconds, the valve on the well was opened and the meter tubing was connected to the well tubing and allowed to pump for at least 60
seconds until the gas readings on the instrument stabilized. Measurements from each well for methane (CH4), oxygen (O2), carbon dioxide (CO2), hydrogen sulfide (H2S), and carbon monoxide (CO) were then recorded on the Solid Waste Section, Landfill Gas Monitoring Data Form. The
tubing was then disconnected from the well sampled with the well valve subsequently closed.
Ms. Jaclynne Drummond, PG May 15, 2017

Page 2 of 2
Results Results from this monitoring event will be included in the site’s June 2017 Semi-annual Groundwater Monitoring Report. The report will be issued in July/August 2017. Landfill gas measurements for historically measured parameters (CH4, O2 and CO2) were consistent with historical data. The additional gases measured (H2S and CO) showed concentrations of zero percent (%) lower explosive limit (LEL)1 at all 11 gas monitoring well locations and at the scale house.
Please contact us if you have any questions or require additional information.
Sincerely, ELM Site Solutions, Inc.

Rusty Norris, PE, PLS, RSM
Senior Engineer c: Mr. David King

1 - % LEL was calculated by using the conversion factor and the parts per million (PPM) instrument reading