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u fn, ERI 205512 R01 Tosco Facility 5886,Stockton,California , __-_ A.pnl 22,_2002 • accordance with the CAP, a site-specific Health and Safety Plan that was kept on site during field operations, and ERI's field protocol (Attachment C) Soil BorinM On January 21 through 24, 2002, ERI's geologist observed Cascade Drilling, Inc (Cascade) of Rancho Cordova, California, drill ten 8-inch diameter soil borings (ASI through AS10) Soil samples were collected continuously from 20 feet below ground surface (bgs) to total depth (TD) from borings AS through AS5, AS7, AS8, and AS10 Soil samples were collected continuously from 10 feet bgs to TD from borings AS6 and AS9 Borings AS 1 through AS 10 were advanced to approximately 30 to 38 feet bgs ERI's geologist identified the soil samples collected from the soil borings using visual and manual methods, and classified the samples according to the Unified Soil Classification System (USCS) (Attachment D) Descriptions of the materials encountered are presented on the attached boring logs (Attachment D) Soil cuttings generated during drilling activities were temporarily stockpiled on site and covered with plastic sheeting pending appropriate disposal by Tosco ERI collected one composite soil sample (four brass sleeves) from the stockpile for laboratory analysis to be used in evaluating disposal options Momtoring_Well Construction • On January 21 through 24, 2002, ERI observed Cascade construct AS wells AS through AS5, AS7, AS8, and AS10, and nested AS wells AS6SID and AS9SID in the respective borings The locations of the wells are shown on Plate 2 The well construction details are shown on the boring logs (Attachment D) Analytical Methods -_Soil Samples ERI submitted the composite soil sample collected from the soil stockpile generated during drilling activities to Sequoia Analytical Laboratories, Inc (Sequoia), a California state-certified laboratory,under Cham-of-Custody protocol, for laboratory analysis The composite soil sample was analyzed for total petroleum hydrocarbons as gasoline (TPHg)and total petroleum hydrocarbons as diesel(THPd) using EPA Method 8015M,benzene,toluene,ethylbenzene,total xylenes (BTEX)and methyl tertiary butyl ether (MTBE)using EPA Method 8020, and total lead using EPA Method 6010A The laboratory analysis reports and Chain-of-Custody records are provided in Attachment E Groundwater Remediation System Installation and Startup During the week of January 28, 2002, Global Project Management Services,Inc (GPMSI),under direct contract to Tosco, installed the groundwater remediation system at the subject site The groundwater remediation system consists of a K-V Associates,Inc (KVA)"C-Sparge"TM ozone microsparging system The system uses 12 KVA Spargepomt®wells (ASI through AS5, AS7, AS8, AS 10, AS6SID and AS9SID)with piping connected to a "C-Sparge"Tm panel consisting of an ozone generator,air 3