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Mr. Don Litchfield <br />June 21, 2012 <br />Page 3 <br /> <br /> <br />58.7% by volume). Note, that the methane gas concentrations at these locations, which are for <br />evaluation purposes and are not compliance locations, have indicated a fluctuating trend. <br /> <br />Finally, during this reporting period, SCS performed monitoring of probe GP Nos. 7 (D, M, S) <br />through GP-12 (D, M, S). These locations were replaced during the recently approved <br />monitoring network expansion as authorized by the San Joaquin County Local Enforcement <br />Agency and Cal Recycle. See data in Table 1 (Subsurface Evaluation Points). Note that these <br />locations are for evaluation purposes only and are not compliance locations. <br /> <br />SCS is scheduled to perform third quarterly monitoring of 2012 (July through September) of the <br />GP probes by the end of the month of September 2012, or as directed by RSI. <br /> <br />ON-SITE INTERIOR STRUCTURE TESTING <br /> <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 April 30, 2012, on-site structures (i.e., landfill office, <br />portable office, scale house, locker room and supply room) were tested for the presence of methane <br />gas. In each structure, random selected locations (i.e., electrical outlets and junction boxes, <br />conduits, drains, floor cracks, etc.) were tested. Test results (Table 1A) indicated no methane gas <br />was detected at any accessible location tested. <br /> <br />SCS is scheduled to perform third quarterly monitoring of 2012 (July through September) of the <br />interiors of on-site structures by the end of the month of September 2012. <br /> <br />STANDARD PROVISIONS <br /> <br />This report addresses conditions at the subject site during the test dates only. Accordingly, we <br />assume no responsibility for any changes that may occur subsequent to our monitoring which <br />could affect the quantity of LFG at the subject site or adjacent properties. <br /> <br />Should you have any questions, do not hesitate to contact either of the undersigned. <br /> <br />Very truly yours, <br /> <br /> Rebecca L. Lucero Sean T. Bass <br />Project Coordinator Project Manager <br />SCS FIELD SERVICES SCS FIELD SERVICES <br /> <br />