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i T Mr. Lochlin Caffey July 1.9, 2006 Page 3 Also, during this reporting period, SCS perfo?m.ed 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 60.4 percent by volume). Note, that the methane gas eoncentratiori.s at these locations,which are for evaluation purposes and are not compliance locations, have indicated a decreasing trend. SCS is scheduled to perform,third quarterly monitoring of 2006 (July through September) of the GP probes by the month of September 2006. On-Site Interior Structure Testi.n4 Tn, accordance with the approved testing schedule, the interiors of on-site structures are to be tested at a minimum, on a quarterly basis. On June 6, 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.thirdquarterly monitoring of 2006 (July through September) of the interiors of on-site structures by the month of September 2006. Standard Provisions This report addresses conditions at the sulliect 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, Mr. Arthur E. Jones Anton. Z. Svorin.ich Project Superintendent Project Manager SCS FT.EL JD SERVICES AMdasTorwed Qrt cc- .Lochlin Caffey—Keller Canyon Landfill