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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> N: � Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • iq. �P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �iFibi'' Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JAY & MARY MCILRATH JUL 16 2003 <br /> P O BOX 326 <br /> STOCKTON CA 95201 <br /> RE: Jay's Mini Mart SITE CODE: 1289 <br /> 3302 West Lane <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> "Additional Assessment Report" dated June 2003, prepared by GHH <br /> Engineering, Inc. for the above referenced site. The report shows low levels of <br /> contaminants were found in the soil and groundwater in this latest phase of <br /> investigation. MTBE was found in both soil and groundwater. This is the first <br /> time 1,2-Dichloroethane was analyzed for in the soil and groundwater samples <br /> obtained at the site and it was found in the grab water sample from SB-3. This <br /> chemical was used in gasoline when the former underground storage tanks were <br /> operated at this site. There is a California Water Service Well (#77) located less <br /> than 1000 feet southeast of this site. Therefore, the lateral and vertical extent of <br /> contamination must be determined. A minimum of three monitoring wells must <br /> be installed to further investigate the contamination and to determine the <br /> groundwater gradient and direction. <br /> A work plan for installation of the monitoring wells should be submitted to EHD by <br /> September 10, 2003. <br /> if you have any questions contact me at (209) 468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> c: CVRWQCB —Jim Barton <br /> GHH Engineering —Tom Ballard <br /> SJCADA— David Irey <br />