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r <br /> rCone Penetrometer Testing Report - January 2002 <br /> MANTECA CITY CORPORATION YARD <br /> r210 East Wetmore Street, Manteca, California <br /> r1.0. INTRODUCTION AND SCOPE OF WORK <br />' At the request of Mr Frederic Clark of the City of Manteca, Advanced GeoEnvironmental, Inc <br /> (AGE), has prepared the enclosed cone penetrometer testing (CPT) report for 210 East Wetmore <br /> Street, Manteca, California The report documents procedures and results for a subsurface <br /> r investigation conducted at the site during January 2002 The site setting is illustrated on Figure 1 <br /> Site structures, boring, monitoring well and CPT locations are depicted on Figure 2 <br /> r The objective of the CPT investigation was to characterize and assess petroleum hydrocarbons in <br /> ground water and to characterize stratigraphy at the site This report has been prepared in accordance <br /> with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) <br /> r for investigation of underground storage tank(UST)sates A summary of previous investigations at <br /> the site and background information was included in the AGE-prepared documents Preliminary <br /> Investigation and Evaluation Report, dated 12 October 2000 and Monitoring Well Installation & <br /> rQuarterly Report- Second Quarter 2001, dated 13 June 2001 <br /> 2.0. PROCEDURES <br /> On 08 and 09 January 2002, three soil boring (CPT-1, CPT-2 and CPT-3) were advanced on-sate <br /> rutilizing CPT technology to model the geological and hydra-geological framework and to identify <br /> and assess potential dissolved petroleum-migration pathways beneath the site Lithologic data was <br /> collected from an initial CPT soil boring A twinned boring was then advanced immediately adjacent <br /> rto the initial boring to collect soil grab ground water samples from selected depths The CPT borings <br /> were advanced utilizing a 25-ton CPT track Boring logs are presented in Appendix A, a site plan <br /> rdepicting the boring locations is presented in Figure 2 <br /> r21 CPT LITHOLOGIC INVESTIGATION <br /> Soil boring CPT-1 was advanced vertically to a maximum depth of 112 feet below surface grade <br /> I (bsg),CPT-2 was advanced vertically to a maximum depth of 104 feet bsg and CPT-3 was advanced <br /> vertically to a maximum depth of 104 feet utilizing a 25-ton truck-mounted CPT drill ng equipped <br /> with 1 50-inch diameter hollow-stem rods A hydraulic ram was utilized for the CPT soil borings <br /> r to advance a cone penetrometer tip to total depth of each soil boring Soil parameters such as cone <br /> penetrometer tip resistance, sleeve friction, friction ratio (ratio between sleeve friction and tap <br /> resistance) and pore water pressure were continuously measured as the cone penetrometer was <br /> I advanced to depth Continuous boring logs were generated utilizing the Hogentogler Co CPT <br /> computer program The Hogentogler Co computer program utilized the CPT Soil Behavior <br /> • Classification System (Robertson, P K , Campanella, R G, Gillespie, D and Greig, J , 1986) to <br /> Advanced GeoEnvironmental,Inc <br /> r <br />