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iCone Penetrometer Testing Report - March 2001 <br /> CURTISS PONTIAC-BUICK <br /> 2450 Toste Road, Tracy, California <br /> I1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Mr Joe Toste, Jr of Tracy Marine Sales, Advanced GeoEnvironmental, Inc <br /> (AGE), has prepared the enclosed cone penetrometer testing (CPT) report for 2450 Toste Road, <br /> Tracy, California The report documents procedures and results for a subsurface investigation <br /> I conducted at the site during March 2001 The site setting is illustrated on Figure 1 Site structures, <br /> bonng, monitoring well and CPT locations are depicted on Figure 2 <br /> The objective of the CPT investigation was to charactenze and assess petroleum hydrocarbons in <br /> ground water and to characterize stratigraphy at the site This report is prepared in accordance with <br /> guidelines established by the California Regional Water Quality Control Board - Central Valley <br /> IRegion (RWQCB) for Investigation of underground storage tank (UST) sates A summary of <br /> previous Investigations at the site and background information is included in the AGE-prepared <br />' Additional Site Assessment Work Plan, dated 30 October 2000 and Quarterly Report - December <br /> 1999, dated 14 February 2000 <br /> 2.0. PROCEDURES <br />' On 13 March 2001, two soil borings (CPT-1 and CPT-2) were advanced on-site utilizing CPT <br /> technology to model the geological and hydro-geological framework and to assess the vertical extent <br /> of dissolved petroleum-hydrocarbons beneath the site Llthologlc data was collected from an initial <br /> CPT soil boring in each locality, a twin boring was then advanced to collect grab ground water <br /> samples from selected depths Bonng logs are presented in Appendix A, a site plan depicting boring <br /> locations is presented in Figure 2 <br /> I <br /> 21 CPT LITHOLOGIC INVESTIGATION <br /> ISoil borings CPT-1 and CPT-2 were advanced vertically to a maximum depth of 70 feet below <br /> surface grade (bsg), utilizing a 25-ton truck-mounted CPT drill ng equipped with 1 50-inch diameter <br /> Ihollow-stem rods A hydraulic ram was utilized for each CPT soil boring to advance a cone <br /> penetrometer tip to total depth of the soil boring Soil parameters such as cone penetrometer tap <br /> resistance, sleeve fraction, friction ratio (ratio between sleeve friction and tip resistance) and pore <br /> water pressure were continuously measured as the cone penetrometer was advanced to depth A <br /> continuous boring log was generated utilizing the Hogentogler Co CPT computer program The <br /> Hogentogler Co computer program utilized the CPT Soil Behavior Classification System <br /> (Robertson, P K, Campanella,R G, Gillespie,D and Greig, J , 1986) to generate a general lithology <br /> . type and display on a CPT boring log(See Appendix A) Rinseate generated during this Investigation <br /> Advanced GeoEnvironmental,Inc <br />