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1 t T • � c t 1 r <br /> ICone Penetrometer Testing Report - December 2003 <br /> . Former MEL BOKIDES PETROLEUM - MOSSDALE <br />' 444 Mossdale Road, Lathrop, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Nick Bokides of Mel Bokides Petroleum,Inc ,Advanced GeoEnvironmental, <br />' Inc (AGE),has prepared the enclosed report for 444 Mossdale Road,Lathrop,California The report <br /> documents procedures and results for a cone penetrometer testing(CPT)investigation conducted at <br />' the site during December 2003, the objective of the investigation was to model the geologic and <br /> hydrogeologic frameworks and to assess potential dissolved petroleum-migration pathways beneath <br /> the site The site setting is illustrated on Figure 1, site structures, boring, monitoring well and CPT <br /> locations are depicted on Figure 2 <br /> This report is prepared in accordance with guidelines issued by the Central Valley,Regional Water <br />' Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites <br /> Background information, including details of previous site assessment work, and ground water <br /> sampling procedures for the site were presented in the AGE-prepared Additional Site Assessment <br />' Work Plan dated 02 August 2002 Previous soil and ground water data is presented in Tables 1 to 4 <br />' • 2.0 PROCEDURES <br /> On 09 December 2003, three soil borings (CPT-1, CPT-2, and CPT-3) were advanced on site <br />' (Figure 2)utilizing CPT technology, at each boring location, lithologic data was collected from the <br /> initial CPT boring, an immediately adjacent twin boring was then advanced to collect grab ground <br /> water samples from selected depths <br /> I <br /> 21 CPT LITHOLOGIC INVESTIGATION <br />' The PT investigation utilized a 25-ton truck-mounted CPT drill n equipped with 1 50-inch <br /> C g g <br />' diameter hollow-stem rods A hydraulic ram was utilized to advance apiezocone(cone penetrometer <br /> with pore pressure measurement) attached to the hollow-stem rod assembly to total depth of each <br /> soil boring, a piezocone illustration is provided in Appendix A <br />' Soil borings CPT-1,CPT-2 and CPT-3 were advanced to a total depth of approximately 110 feet <br /> below surface grade (bsg) [GPT' 1 c w -tv 107 `hq� 4ly�jay <br /> IAt each boring location, the soil parameters of piezocone tip resistance, sleeve friction and pore <br /> water pressure were continuously measured as the piezocone was advanced to depth Utilizing the <br />' soil parameters, the Hogentogler Co computer program interpreted general hthology types based <br /> on the CPT Soil Behavior Classification System (Robertson, P K , Campanella, R G, Gillespie, D, J <br /> 1 Advanced GeoEnvironmental,Inc <br />