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C. Well Details Dimensions for proposed wells are based on the maximum design refuse depth elevation of 180 ft msl. 1) Shallow Probes Shallow probes of proposed new wells allow sampling from five to ten feet from the surface (Table 1). Shallow probe of existing well SG-12 allows sampling to the depth of fifteen feet. 2) Intermediate Probes Intermediate probes allow sampling at or near half depth of refuse in most wells (Table 1). 3) Deep Probes Deep probes allow sampling at or near the designed refuse depth (Table 1). Existing monitoring well SG-12 was installed in accordance with the regulations in force at the time of installation (June 2004), which required a drill depth to the refuse within 1,000 feet of the well. The design refuse depth elevation within 1000 feet of this well is 222 ft. MSL and the well was drilled to an elevation of 220 ft. MSL. Therefore, the County asks that this well be accepted. D. Well Construction Proposed new soil gas wells will be drilled by a licensed drilling contractor. Wells will be logged during drilling by a geologist or geotechnical engineer. The geotechnical engineer will characterize soil cuttings using the ASTM Designation: D2488-84 method for visual classification. A brief hand written report of the soil classification will be provided to the Local Enforcement Authority (LEA) before well construction. Obstruction to the permeable soil lens layers, if any are discovered during drilling will be avoided. After construction, a final as-built well log of new soil gas wells will be submitted. E. Non-Perimeter Soil Gas Monitoring Wells The previous perimeter-monitoring network included SG-12 and nine other soil gas wells. SG-12 will be incorporated into the proposed monitoring perimeter, whereas the other wells will not. The County intends to retain these wells for other purposes. Foothill Sanitary Landfill 3 County of San Joaquin Landfill Gas Monitoring Plan Department of Public Works Solid Waste Division