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Mr. Lochlin Caffey April 24, 2006 Page 3 Also, during this reporting period, SCS performed monitoring of temporary subsurface evaluation probe Nos. TGP-01 through TGP-39. Results of this testing indicated that most of these evaluation probes exhibited methane gas concentrations above the LEL (up to 62.5 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 decreasing trend. SCS is scheduled to perform second quarterly monitoring of 2006 (April through June) of the GP probes by the month of June 2006. On-Site Interior Structure Testing 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 March 27, 2006, 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 (shown on Table 2) indicated no methane gas was detected at any accessible location tested. SCS is scheduled to perform second quarterly monitoring of 2006 (April through June) of the interiors of on-site structures by the month of June 2006. Standard Provisions 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 t•uly yours, Mr. Arthur E. Jon Project Superintendent Anton Z. Svorinich Project Manager SCS FIELD SERVICES AZS:das/Forward Qrt cc: Lochlin Caffey—Keller Canyon Landfill