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ENVIRONMENTAL HEALTH DEPARTMENT <br /> " SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> 2` ` .Z Donna K.Heran,R.E.H.S. <br /> .. 304 East Weber Avenue, Third Floor Cad Bergman,R.E.H.S. <br /> 0. ' Director <br /> AlOlsen,R.E.H.S. Stockton, California95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> ` Douglas W.Wilson,R.E.H.S. <br /> dq... N P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> (�Foa Laurie A.Cotulla,R.E.H.S. <br /> R <br /> Fax: (209) 464-0138 obert Mccleuon,R.E.H.s. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JUL 1 U 2002 <br /> GEORGE AND MEI TERANISHI <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: GEORGES SERVICE Site Code: 1550 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Work Plan Addendum for Bio-Venting/Vapor Extraction, dated 10 June 2002, <br /> (WPA); and Report — Groundwater Monitoring First Quarter 2002, dated <br /> 20 May 2002, (1 QR02); and portions of other previous reports for the above- <br /> referenced site - both prepared by Geological Technics, Inc. (GTI). A brief <br /> summary of site activities and findings is as follows: <br /> 1/24/90 Two 1000-gallon gasoline USTs were removed. Soil samples were <br /> collected and sent to FGL Environmental lab. All soil samples collected from east <br /> and west ends of former Tank #1 and Tank #2 and along the product line <br /> contained elevated concentrations of BTEX and TPHg. <br /> 4/5/90 One 400-gallon waste oil tank and one 330-gallon kerosene tank <br /> were removed from the site. <br /> 4/25/95 Exploratory soil borings SB-1, SB-2, and HB-1A through HB-6 were <br /> advanced to approximately 10 feet bsg on the site to assess impacted soil and <br /> monitoring wells MW-1, MW-2 and MW-3 were installed with screen intervals of 5 <br /> to 20 feet below surface grade (bsg). <br /> 4/29/97 Monitoring well MW-102 with a screen interval of 45 to 47.5 feet <br /> bsg was installed. <br /> 4/30/97 Monitoring wells MW-4, MW-5, MW-6, MW-7 and MW-8 were <br /> installed with screen intervals of 7 to 22 feet bsg <br /> 6/30/98 Monitoring wells MW-105 and MW-202 were installed with screen <br /> intervals of 32.5 to 35 feet bsg and 79 to 81.5 feet bsg, respectively. <br />