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Mr. Don Litchfield January 13, 201 1 Page 3 Also, during this reporting period, SCS performed monitoring of temporary subsurface evaluation probe Nos. TGP-01 through TGP-39 (Table 1). Results of this testing indicated that most of these evaluation probes exhibited methane gas concentrations above the LEL (up to 51.9 percent by volume). Note, that the methane gas concentrations at these locations, which are for evaluation purposes and are not compliance locations, have indicated a fluctuating trend. SCS is scheduled to perform first quarterly monitoring of 2011 (January through March) of the GP probes by the end of the month of March 2011. In accordance with the approved testing schedule, the interiors of on-site structures are to be tested at a minimum, on a quarterly basis. On December 29, 2010, on-site structures (i.e., landfill office, portable office, scale house, locker room and supply room) were tested for the presence of methane gas. In each structure, random selected locations (i.e., electrical outlets and junction boxes, conduits, drains, floor cracks, etc.) were tested. Test results (Table IA) indicated no methane gas was detected at any accessible location tested. SCS is scheduled to perform first quarterly monitoring of 2011 (January through March) of the interiors of on-site structures by the end of the month of March 2011. This report addresses conditions at the subject site during the test dates only. Accordingly, we assume no responsibility for any changes that may occur subsequent to our monitoring which could affect the quantity of LFG at the subject site or adjacent properties. Should you have any questions, do not hesitate to contact either of the undersigned. Very truly yours, tA.14la� ' Whitney M. Bills Project Professional SCS FIELD SERVICES cc: Lochlin Caffey — Keller Canyon Landfill Sean T. Bass Project Manager SCS FIELD SERVICES