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' Cone Penetrometer Testing Report - January 2002 • g P rY Former Fisco Warehouse (Howard Lenz Property) ' 1648 Shaw Road, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr. Peter Lenz, Advanced GeoEnvironmental, Inc. (AGE), has prepared the ' enclosed cone penetrometer testing (CPT) report for 1648 Shaw Road, Stockton, California. The report documents procedures and results for a subsurface investigation conducted at the site during ' January 2002.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 ground water and to characterize stratigraphy at the site. This report is prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) 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 documents, Monitoring Well Installation Work Plan, dated 21 August 2000 and Monitoring Well Installation and Quarterly Report-First Quarter 2001, dated 23 March 2001 2.0. PROCEDURES On 10 and 11 January 2002, three soil boring (CPT-1, CPT-2 and CPT-3) were advanced on-site utilizing CPT technology to model the geological and hydro-geological framework and to assess potential dissolved petroleum-migration pathways beneath the site. Lithologic data was collected from initial CPT borings. Twin borings were then advanced to collect grab ground water samples ' from selected depths. The CPT borings were advanced utilizing a 25-ton CPT truck.Boring logs are presented in Appendix A; a site plan depicting the boring locations is presented in Figure 2. 2.1. CPT LITHOLOGIC INVESTIGATION ' Soil borings CPT-1, CPT-2 and CPT-3 were advanced vertically to total depths of 96 feet below surface grade (bsg), 134 feet bsg and 125 feet bsg, respectively, utilizing a 25-ton truck-mounted CPT drill rig equipped with 1.50-inch diameter hollow-stem rods. A hydraulic ram was utilized to advance a cone penetrometer tip attached to the hollow-stem rod assembly to total depth of each soil boring. Soil parameters such as cone penetrometer tip resistance,sleeve friction, friction ratio(ratio I between sleeve friction and tip resistance) and pore water pressure were continuously measured as the cone penetrometer was advanced to depth. Continuous boring logs were 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). • Advanced GeoEnvi ron mental,Inc. I