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C <br /> CAMBRIA <br /> November 11, 1997 <br /> Mr Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <<tlri�Fic��sP � traF*t, t it L: �j <br /> Martinez, California 94553 <br /> 5 <br /> Re Site Investigation Report/Quarterly Monitoring Report <br /> Fourth Quarter 1997 55 <br /> Shell Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC # 204-7525-0104 <br /> Dear Mr Perez <br /> This report was prepared by Cambria Environmental Technology Inc (Cambria) on behalf of <br /> Shell Oil Products Company (Shell) and documents the recent site investigation and quarterly <br /> imonitoring activities for the fourth quarter of 1997 at the above referenced site (Plates 1 and <br /> 2) The scope of work followed during this investigation included evaluating the extent of <br /> petroleum hydrocarbons in soil and ground water as presented to Enviros, Inc 's Work Plan <br /> dated May 1, 1996 The investigation was required by the San Joaquin County Public Health <br /> Services (SJCPHS) based on correspondence dated December 13, 1995 and discussions from a <br /> meeting held between SJCPHS and Shell on February 2, 1996 This work was performed in <br /> accordance with SJCPHS and Regional Water Quality Control Board (RWQCB) guidelines <br /> CAMBRIA SITE BACKGROUND <br /> ENVIRONMENTAL The subject site is located on the southeast corner of the intersection of Pacific Avenue and <br /> TECHNOLOGY,INC Porter Avenue in Stockton, California (Plate 2) The service station layout consists of three <br /> underground gasoline storage tanks, two product islands, and a station kiosk <br /> 270 PERvINS STREET, <br /> PO Box 259 In 1990, the former underground fuel storage tanks (USTs) were removed A total of fourteen <br /> SONOMA, soil borings (B-I through B-14) were drilled and sampled Total Petroleum Hydrocarbons <br /> calculated as Gasoline (TPH-G) concentrations ranged from non detect (ND) to 17,000 parts <br /> CA 95476 per million (ppm) in selected soil samples Benzene concentrations ranged from ND to 400 <br /> 9351850 ppm Borings TS-1 through TS-6 were drilled through the former UST complex to a depth of Tj <br /> 16 feet below grade (fbg) Borings TR-1 through TR-6 were drilled along product lines and near <br /> FAX (707)935 9 <br />