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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PpU1N SAN JOAQUIN COUNTY <br /> Yo.. Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, S.,R.D.I. <br /> Douglas W.Wilson, <br /> R.E.H.S. <br /> • �q. ��P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> i F o R 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 /> ROBERT COCHRAN <br /> CHEVRON PRODUCTS COMPANY JUN 0 3 2003 <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0904 <br /> RE: Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> analytical results for soil samples collected during the removal of three underground <br /> storage tanks (UST) at the above listed site on 24 February 2003, and submitted on your <br /> behalf by Secor International Incorporated. Two soil samples taken from beneath two of <br /> the USTs contained low concentrations of methyl tertiary-butyl ether (MTBE) and <br /> tertiary-amyl methyl ether (TAME), in addition to tertiary-butyl alcohol (TBA) and total <br /> xylenes found in one of these samples. The potential that a release occurred from the <br /> UST system removed in February 2003 is significant, and further investigation of <br /> contamination in soil and groundwater in those areas will be necessary. <br /> EHD has not received the report documenting the destruction of the groundwater <br /> monitoring and ozone sparge wells; removal of USTs, piping, and fuel dispensers; and <br /> site demolition activities. Please submit this report by 7 July 2003. <br /> It is also necessary to prepare a work plan for the installation of monitoring wells at this <br /> site now that demolition and removal have been completed. Please submit a work plan <br /> for additional site investigation and installation of monitoring wells by 21 July 2003. <br /> Should you have any questions or concerns regarding these activities, please contact <br /> Vicki McCartney by mail (address on letter head), or by telephone at (209)468-3456. <br /> Donna Heran, REHS, Director <br /> Environmental Health Services <br /> Vicki McCartney Marga�gonio, EHS <br /> LOP/Site Mitigation Unit Supervisor, Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> William Brasher, Secor <br />