|
SCS monitored structures by testing randomly selected locations where methane gas would most
<br /> likely accumulate (e.g., electric outlets,junction boxes, conduits, drains, cabinets and closets). Other
<br /> required monitoring documentation (e.g., sampling personnel, date, time and meteorological
<br /> conditions) are shown on the attached testing data tables.
<br /> GAS MONITORING PROBE TESTING
<br /> In accordance with the approved testing schedule, all perimeter compliance GP probes are to be
<br /> tested at a minimum on a quarterly basis. On April 27, May 11, June 1 and June 12, 2023, all
<br /> accessible perimeter Gas Monitoring Probes defined as GP-01 through GP-28R were tested for the
<br /> presence of LFG.
<br /> Test results (Table 1) indicated that all GP probes exhibited methane gas concentrations below the
<br /> LEL (5 percent by volume), or no methane gas was detected. These results indicated that as of the
<br /> date of this report,the subject site perimeter probes are in compliance with the requirements of Title
<br /> 27 CCR Article 6.
<br /> SCS is scheduled to perform the third quarterly monitoring of 2023 (July through September) of the
<br /> GP probes by the end of September 2023, or more frequently as directed by Republic.
<br /> NEW POINT OF COMPLIANCE MONITORING PROBE TESTING, SITE WIDE
<br /> WDR LOCATIONS
<br /> In accordance with the approved testing schedule, all perimeter compliance GP probes are to be
<br /> tested at a minimum, on a quarterly basis. During this reporting period, all accessible perimeter Gas
<br /> Monitoring Probes defined as GP-1A through GP-6A and GP-10 through GP-15 were tested for the
<br /> presence of LFG.
<br /> The results of this monitoring indicated that LFG Monitoring Probe Nos. GP-10D, GP-10M, GP-10S,
<br /> GP-11D, GP-11M, GP-11S, GP-12D, GP-12M, GP-13D, GP-14M, GP-15M and GP-1AD exhibited VOC
<br /> concentrations in excess of the 10 PPB standard. The highest VOC reading was observed at LFG
<br /> Monitoring Probe No. GP-11D (up to 64.10 ppm). No methane gas was detected at any location
<br /> monitored in excess of 1 percent by volume, except for LFG Monitoring Probe Nos. GP-10D (61.50
<br /> percent by volume), GP10M (60.30 percent by volume), GP-10S (60.00 percent by volume), GP-11D
<br /> (0.80 percent by volume), and GP-11S (0.40 percent by volume) (please see Table 1). Note that
<br /> these probes are intended for evaluation purposes only and are not Title 27 compliance locations.
<br /> As required, on October 10, 2022, annual samples were obtained and analyzed using EPA method
<br /> TO-15. These results were submitted directly to Republic. The next annual sampling event will be
<br /> performed by the end of November 2023 or as requested by the client.
<br /> SCS is scheduled to perform the third quarterly monitoring of 2023 (July through September) of the
<br /> GP probes by the end of September 2023, or more frequently as directed by Republic.
<br /> ON-SITE INTERIOR STRUCTURE TESTING
<br /> In accordance with the approved testing schedule, the interiors of on-site structures are to be tested,
<br /> at a minimum, on a quarterly basis. On June 1, 2023, on-site structures (i.e., landfill office, scale
<br /> house, breakroom, storage container and maintenance room) were tested for the presence of
<br /> methane gas. In each structure, randomly selected locations (i.e., electrical outlets and junction
<br /> Forward/Austin Landfill—Second Quarter 2023 www.scsenaineers.com
<br /> 2
<br />
|