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<br />Forward/Austin Landfill – Third Quarter 2022 www.scsengineers.com
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<br />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 July 12, August 8 and 15, 2022, all accessible
<br />perimeter Gas Monitoring Probes defined as GP-01 through GP-28R were tested for the presence of
<br />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 fourth quarterly monitoring of 2022 (October through December) of the
<br />GP probes by the end of the month of December 2022, 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-12S, GP-13D, GP-13S, GP-14D, GP-14S, GP-15D, GP-
<br />15M, GP-1AD, GP-1AM, GP-2AD, GP-2AS, GP-3AS, GP-4AM, GP-4AS, GP-5AD, GP-5AM, GP-5AS, and
<br />GP-6AM exhibited VOC concentrations in excess of the 10 PPB standard. Highest VOC reading was
<br />observed at LFG Monitoring Probe No. GP5AM (up to 72.1 ppm). No methane gas was detected at
<br />any location monitored in excess of 1 percent by volume, with the exception of LFG Monitoring Probe
<br />Nos. GP-10D (up to 57.40), GP-10M (up to 54.70) and GP-10S (up to 39.80) (please see Table 1).
<br />Note, that these probes are intended for evaluation purposes only and are not Title 27 compliance
<br />locations. As required, on November 8, 2021, annual samples were obtained and analyzed using
<br />EPA method TO-15. These results were submitted directly to Republic. The next annual sampling
<br />event will be performed by the end of December 2022, or as requested by the client.
<br />SCS is scheduled to perform the fourth quarterly monitoring of 2022 (October through December) of
<br />the GP probes by the end of the month of December 2022, or more frequently as directed by
<br />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 August 8, 2022, on-site structures (i.e., landfill office, scale
<br />house, breakroom, storage container and maintenance room) were tested for the presence of
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