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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). 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 October 6, 7 and 10, 2022, all accessible perimeter
<br /> Gas Monitoring Probes defined as GP-01 through GP-28R were tested for the presence of LFG.
<br /> Test results (Table 1) indicated that all GP probes tested exhibited methane gas concentrations
<br /> below the LEL(5 percent by volume) or no methane gas was detected. These results indicated that
<br /> as of the date of this report,the subject site perimeter probes are in compliance with the
<br /> requirements of Title 27 CCR Article 6.
<br /> SCS is scheduled to perform first quarterly monitoring of 2023 (January through March) of the GP
<br /> probes by the end of the month of March 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 /> Results of this monitoring indicated that LFG Monitoring Probe Nos. GP-10D, GP-10M, GP-10S, GP-
<br /> 11D, GP-11M, GP-11S, GP-12D, GP-12M, GP-13D, GP-1AD, GP-1AM, GP-2AD, GP-2AS, GP-3AD, GP-
<br /> 3AM, GP-3AS, GP-4AD, GP-4AM and GP-4AS exhibited VOC concentrations in excess of the 10 PPB
<br /> standard. Highest VOC reading was observed at LFG Monitoring Probe No. GP-1AD (up to 12.20
<br /> ppm). No methane gas was detected at any location monitored in excess of 1 percent by volume,
<br /> with the exception of LFG Monitoring Probe Nos. GP-10D (32.00 percent by volume), GP10M (38.60
<br /> percent by volume) and GP-10S (39.20 percent by volume) (please see Table 1). Note, that these
<br /> probes are intended for evaluation purposes only and are not Title 27 compliance locations. As
<br /> required, on October 10, 2022, annual samples were obtained and analyzed using EPA method TO-
<br /> 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 first quarterly monitoring of 2023 (January through March) of the
<br /> GP probes by the end of the month of March 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 October 7, 2022, 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, random selected locations (i.e., electrical outlets and junction
<br /> Forward/Austin Landfill—Fourth Quarter 2022 www.scsenaineers.com
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