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Mr. Joyesh Chandra <br /> October 13, 2023 <br /> Page 2 <br /> • Close test valve, disconnect sample instruments and secure sample location. <br /> SCS monitored structures as directed by the County. Other required monitoring documentation (e.g., <br /> sampling personnel, date, time and meteorological conditions) is shown on the attached testing data <br /> tables. Instrument calibration logs are attached to this report. <br /> LFG MONITORING PROBE TESTING <br /> In accordance with the approved testing schedule, all LFG compliance-monitoring probes are to be <br /> tested at a minimum, on a quarterly basis. On August 24 and September 27, 2023, all LFG <br /> compliance and evaluation monitoring probes were tested. Results of the probe testing(Table 1) <br /> indicated that all probes exhibited methane gas concentrations below the LEL (5 percent by volume) or <br /> no methane gas was detected. SCS will continue to monitor all compliance probes quarterly as <br /> directed by the County. SCS is scheduled to perform the fourth quarter monitoring for 2023 (October <br /> through December) of all the probes before the end of the month of December 2023. <br /> STRUCTURES <br /> In accordance with the approved testing schedule,the structures are to be tested on a quarterly basis. <br /> On September 27, 2023, structures were tested for the presence of methane gas. Test results (Table <br /> 2) indicated no methane gas was detected at any structure location tested. SCS is scheduled to <br /> perform the fourth quarter monitoring for 2023 (October through December) of the structures before <br /> the end of the month of December 2023. <br /> STANDARD PROVISIONS <br /> This report addresses conditions at the subject site during the test date only. Accordingly, we <br /> assume no responsibility for any changes that may occur subsequent to our monitoring which could <br /> affect the quantity of LFG at the subject site or adjacent properties. <br /> Should you have any questions, do not hesitate to contact Justin Ruhle at(209) 279-4418. <br /> Sincerely, <br /> Rebecca L. Lucero Justin C. Ruhle <br /> Project Coordinator Project Manager <br /> SCS Field Services SCS Field Services <br /> cc: M. Houghton <br /> J. Acevedo <br />