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1 , • Cone Penetrometer Testing Site Investigation -February 2004 - NOMELLINI CONSTRUCTION CO ' 1045 West Charter Way, Stockton, California 1.0. ' INTRODUCTION AND SCOPE OF WORK - At the request of Mr Dante John Nomellim, Advanced GeoEnvironmental, Inc (AGE) has prepared this report of findings for 1045 West Charter Way (the site), Stockton, California The report documents procedures and results for cone penetrometer testing (CPT) conducted at the site during February 2004 (First Quarter 2004) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of this investigation was to characterize and assess the vertical and horizontal extent of dissolved petroleum hydrocarbons, hydrocarbon -impacted soil and to characterize the geologic and hydrogeologic framework underlying the site This report is prepared in accordance with guidelines established by the California Regional Water Quality Control Board (RWQCB) - Central Valley Region for investigation of underground storage tank (UST) sites The following is a chronology of the CPT investigation • 05 February 2004- Advancement of CPT soil borings (CPT -1 and CPT -3) to maximum ' • depths of 100 feet below surface grade (bsg), collection of both soil and ground water samples at selected depths • 06 February 2004- Advancement of CPT soil borings (CPT -2 and CPT -4) to maximum depths of 100 feet bsg, collection of both soil and ground water samples at selected depths All CPT soil and grab ground water samples were collected from an adjacent soil boring bearing the same designation as the initial CPT, boring , 1 1 2 0. CONE PENETROMETER TESTING On 05 and 06 February 2004, four soil borings (CPT -1 through CPT -4) were advanced at the site utilizing CPT technology to characterize the geologic and hydrogeologic framework and to identify potential contaminant -migration pathways CPT procedures for the site were outlined in Work Plan Addendum, dated 17 June 2003, prepared by AGE and approved by the San Joaquin County Environmerital Health Department (SJCEHD) by letter dated 25 September 2003 (Appendix A), a ' copy of the SJCEHD drilling permit for CPT -1 through CPT -4 is included in Appendix A Based on CPT lithologic sounding data collected from the initial borings CPT -I through CPT -4, soil and depth -discrete `grab' ground water samples were collected adjacent each initial CPT location ■ • via a duplicate soil boring advanced within two feet of each initial CPT soil boring CPT boring logs are presented in Appendix B, a site plan depicting boring locations is presented on Figure 2 IAdvanced Geo Environmental, Inc