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Quik Stop Station No 039 February 28,2000 Stockton California Subsurface Site Assessment Drilling and Soil Sampling On November 18, 1999, a Horizon geologist observed the drilling of soil bonngs MW-1, MW-2, and MW-3 The borings were drilled and sampled using a truck-mounted Mobile B-61 drill rig equipped with 8-inch diameter hollow-stem augers Drilling and sampling activities were performed by V&W Drilling (V&W), a C-57 licensed contractor from Rio Vista, California Borings MW-1, MW-2, and MW-3 were advanced to depths of approximately 61 to 61% feet During drilling, soil samples were collected from the borings at five-foot intervals or less, from the ground surface to the total depth of each boring Soil samples and cuttings were screened for the presence of petroleum hydrocarbon vapors with a portable organic vapor meter (OVM) The OVM readings noted during drilling were recorded on the soil bonng logs, which contain soil descriptions and well completion data (Appendix C) All soil samples were contained in chilled storage for transport to the laboratory for the requested analyses Sediments encountered during the drilling of the three borings consisted of alternating layers of silty sand (SM) and clayey to sandy silt (ML) to the total depth of the borings at approximately 61 to 611/2 feet bsg The sediments from the borings were classified using the Unified Soil Classification System (USCS) A copy of the USCS is shown on the Boring Log Symbol Key in Appendix C Groundwater was encountered in the borings at depths of approximately 55 feet bsg Soil cuttings generated during the drilling operations were stockpiled on and covered with plastic and remained onsite until subsequent disposal in late December 1999 The soil cuttings were screened with an OVM, and four soil samples were collected from the stockpile for laboratory analysis 7039-12 rpt 4 HORIZON ENVIRONMENTAL INC