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Cone Penetrometer Testing Report - March 2001 TRACY MARINE SALES 2353 Toste Road, Tracy, California INTRODUCTION AND SCOPE OF WORK At the request of Mr roe Taste, Jr of Tracy Marine Sales, Advanced GeoEnvironmental, Inc (AGE), has prepared the enclosed cone penetrometer testing (CPT) report for 2353 Toste Road, Tracy, California The report documents procedures and results for a subsurface investigation conducted at the site during March 2001 The site setting is illustrated on Figure 1 Site structures, boring, monitoring well and CPT locations are depicted on Figure 2 The objective of the CPT investigation was to characterize and assess petroleum hydrocarbons in soil and ground water and to model the geological and hydro-geological framework and to assess potential dissolved petroleum-migration pathways beneath, the site This report is prepared in accordance with guidelines established by the California Regional Water Quality Control Board - Central Valley Region (RWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site and background information was included in the AGE-prepared Additional Site Assessment Work Plan, dated 26 September 2000 2.0. PROCEDURES On 12 March 2001, four soil borings(CPT-1 through CPT-4) were advanced on-site utilizing CPT technology Lithologic data was collected from an initial CPT soil boring in each locality An adjacent twin boring was then advanced to collect soil and grab ground water samples from selected depths All CPT borings were advanced utilizing a 25-ton CPT truck Boring logs are presented in Appendix A, a site plan depicting boring locations is presented in Figure 2 21 CPT LITHOLOGIC INVESTIGATION Soil borings CPT-1 through CPT-4 were advanced vertically to a maximum depth of 60 feet below surface grade(bsg), utilizing a 25-ton truck-mounted CPT drill ng equipped with 1 50-inch diameter hollow-stem rods A hydraulic ram was utilized for each CPT soil boring to advance a cone penetrometer tip to total depth of each soil boring Soil parameters such as cone penetrometer tip resistance, sleeve friction, friction ratio (ratio between sleeve friction and tip resistance) and pore water pressure were continuously measured as the cone penetrometer was advanced to depth A continuous boring log was generated utilizing the Hogentogler Co CPT computer program The Hogentogler Co computer program utilized the CPT Soil Behavior Classification System (Robertson,P K, Campanella, R G, Gillespie,D and Greig, J , 1986) to generate a general lithology type and display on a CPT boring log(See Appendix A) Rinseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums and was stored on-site The soil borings were backfilled over their entire depth range with a portland cement grout mix Advanced GeoEnvaronmcntai,Inc