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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PpU1fY SAN JOAQUIN COUNTY <br /> �o._ .cow Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> =< Director 304 East Weber Avenue,Third Floor g <br /> Mike Huggins,R.E.H.S.,R.D.J. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • . Pro ram Manager <br /> 4�tFoa;�� Laurie A.Cotulla,R.E.H.S. Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> , <br /> Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> 7-ELEVEN CORP. APR 14 <br /> �(! � <br /> KEN HILLIARD <br /> P.O.BOX 711 'I AFZ 15 2004 <br /> DALLAS, TX 75221-0711 <br /> RE: 4627 DaVinci SITE CODE: 1047 <br /> San Joaquin County Environmental Health Department(EHD) is the lead agency providing the <br /> oversight of the investigation and cleanup of releases from underground storage tanks (USTs) <br /> within San Joaquin County. EHD has a contract with the California State Water Resources <br /> Control Board to conduct a UST corrective action program. The above referenced site was <br /> placed in the EHD Local Oversight Program (LOP) in March, 1997. <br /> A soil and ground water investigation has been conducted at the above referenced site and <br /> contamination has been documented. The vertical and lateral extent of soil and ground water <br /> contamination has not been fully defined with the information obtained from the existing 7 <br /> monitoring wells installed on site. The analytical results of the ground water from MW#7, <br /> located down gradient on the southwest portion of the property, have shown high concentrations <br /> of both MTBE and TBA. <br /> You are directed to continue with your investigation and define the full extent of soil and ground <br /> water contamination caused by the unauthorized release from the USTs. After the extent of <br /> contamination is defined, you will be required to conduct feasibility testing and perform <br /> corrective action. <br /> Please submit a Work Plan, an EHD well permit application, and $89.00 permit fee to perform <br /> additional investigation and sampling by June 1, 2004. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at (209)468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Harlin Knoll, Senior REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> Cc: Howard N.Sweet <br /> Secor-Brian Carey <br />