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To further determine the extent and bevel of ground water and soil contamination installation of ��j`o additional monitoring wells is proposed. Proposed well locations based on the results of the SVCA and previous investigations are illustrated in Figure 11 -1 . IN accordance with the San Joaquin Health Department and California Regional Water Quality Control Board Guidelines the holes will be drilled to the depth of approximately 30-35 feet , i .e . , 20 feet below the static water level or 5 feet into the competent clay layer encountered below the water table. The boreholes will be drilled using a hollow stem auger . During drilling soil samples will be collected using the California Modified split spoon sampler with brass lining starting at five feet below the surface to the total depth of the borehole, every five feet. The samples from just above the water table will be analyzed for total petroleum hydrocarbon and selected gasoline constituents using modified EPA 8015 , 8020 and 602 methods as appropriate. Boreholes will be completed on monitoring wells with screen, 0 . 020-in slot, schedule 40 at intervals 10 feet above to the 20 feet below of static water level or to the competent clay layer . Above the screen to the surface, schedule 40 blank casing will be installed. Each boring will be equipped with bottom threaded plug and well cap. Ann An space from the bottom to approximately 2 feet above the screen will be filled with t3 Monterey sand. Sand pack will be covered with 2 feet of bentonite seal and cement grout to the surface. Top of casing will be secured with water tight Christy box, that can be opened by special wrench, and to protect the well from unauthorized entry. Each well after completion will be developed using either a submerge pump oz PVC bailer (dependent upon yield ) . After well ' development all existing wells MW1 , MW21 MW3 , MW4 , and MW5 will i 4