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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).
<br /> Other 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 August 14, 15, and September 14, 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 fourth quarterly monitoring of 2023 (October through December) of
<br /> the GP probes by the end of December 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-10S, GP-11D,
<br /> GP-11S, GP-12D, GP-13D, GP-1AD, GP-1AS, GP-2AD, GP-2AM, GP-3AM, GP-3AS, GP-4AD and GP-5AM
<br /> exhibited VOC concentrations in excess of the 10 PPB standard. The highest VOC reading was
<br /> observed at LFG Monitoring Probe No. GP-11D (up to 14.60 ppm). No methane gas was detected at
<br /> any location monitored in excess of 1 percent by volume, except for LFG Monitoring Probe Nos. GP-
<br /> 10D (55.80 percent by volume), GP10M (47.60 percent by volume), and GP-10S (49.60 percent by
<br /> volume) (please see Table 1). Note that these probes are intended for evaluation purposes only and
<br /> are not Title 27 compliance locations. As required, on October 10, 2022, annual samples were
<br /> obtained and analyzed using EPA method TO-15. These results were submitted directly to Republic.
<br /> The next annual sampling event will be performed by the end of November 2023 or as requested by
<br /> the client.
<br /> SCS is scheduled to perform the fourth quarterly monitoring of 2023 (October through December) of
<br /> the GP probes by the end of December 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 September 14, 2023, on-site structures (i.e., landfill office,
<br /> scale 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—Third Quarter 2023 www.scsenaineers.com
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