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' Cone Penetrometer Testing/Site Assessment Report THRIFTY OIL COMPANY STATION #171 ' 1250 North Wilson Way, Stockton, California 95202 ' 1.0. INTRODUCTION On behalf of Thrifty Oil Co (Thrifty), Advanced GeoEnvironmental, Inc (AGE) has prepared this report for Thrifty Station#171 located at 1250 North Wilson Way(the site), Stockton, California The scope of work included advancement of three soil probe borings(CPT-2 through CPT-4)and collection and analysis of soil and groundwater samples The field work was conducted in accordance with the Thrifty's Request for Bad,based on Additional Site Assessment Work Plan,dated 25 February 2003 and approved by the San Joaquin County Environmental Health Department (SJCEHD)by letter dated 27 September 2000 Four soil-probe boring locations (CPT-I through CPT-4)were included in the original Additional Site I Assessment Work Plan, however, two soil probe borings (CPT-I and CPT-2) were located on North Wilson Way,in the middle of a traffic lane Due to the logistics of traffic control on North Wilson Way, the City of Stockton imposed work-hour,and lane closure limitations The westbound traffic turn lane would need to remain open at all times,which limited the available area of the work in the north-bound left travel lane Due to heavy traffic volume and the City of Stockton imposed traffic control limitations, the locations of CPT-1 and CPT-2 would have to be closer together than originally anticipated in the �. workplan, the close proximity of the borings may not provide the originally-anticipated independent lithological information On 18 November 2003 an AGE representative at the site discussed with Thrifty Oil Co the possibility of removing one of the borings located in North Wilson Way, thereby narrowing the investigation to three CPT borings After receiving approval from Thrifty Oil Co to pursue removal of one CPT boring in North Wilson Way, Mr Michael Infurna of SJCEHD was contacted and the logistical problems were discussed Mr Inf ima agreed with AGE's recommendation, Iand CPT-1 was removed from this scope of work 2 0. PROCEDURES On 18 to 21 November 2003, three soil borings (CPT-2 to CPT-4) were advanced on- and off-site (Figure 2) utilizing CPT technology At each boring location, lithologic data was collected from the initial CPT boring, two immediately adjacent borings were then advanced at each CPT location to collect soil and grab groundwater samples from selected depths 2 1 CPT LITHOLOGIC INVESTIGATION The CPT investigation utilized a 25-ton truck-mounted CPT drill rig equipped with 150-inch diameter hollow-stem rods A hydraulic ram was utilized to advance a piezocone (cone penetrometer with pore pressure measurement) attached to the hollow-stem rod assembly to total depth of each soil boring, a piezocone illustration is provided in Appendix A Advanced GeoEnvironmental,Inc I