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ENVIRONMENTAL HEALTH DEPARTMENT <br /> Pp U 1 N SAN JOAQUIN COUNTY <br /> o._�.•.coG Unit Supervisors <br /> :� Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> LIQ' r Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • �.. �P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4�iki6*0Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager FaX: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> ROBERT COCHRAN <br /> JAN 17 2003 <br /> CHEVRON PRODUCTS COMPANY <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1452 SITE CODE: 1665 <br /> 334 E. Main Street <br /> Ripon, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> "Chevron Groundwater Monitoring Report (2Q2002)" dated June 28, 2002, <br /> "Chevron Groundwater Monitoring Report (3Q2002)" dated October 9, 2002, both <br /> prepared by SECOR International Incorporated and our file for the above <br /> referenced site. <br /> On July 1, 2002, EHD approved a work plan, submitted by SECOR, for two CPT <br /> borings and installation of a six inch monitoring well. This work has not been <br /> completed to date. In telephone conversations with SECOR staff, EHD has been <br /> informed that this work may be performed by the end of January 2003. Submit <br /> an EHD well permit application and $89 permit fee immediately. The work must <br /> be completed by February 1, 2003 and a report of the work must be submitted to <br /> EHD by March 1, 2003. <br /> The results of the analysis of the water samples from monitoring well MW5S <br /> show increasing concentrations of MTBE, TAME and TBA since the well was <br /> installed in January 2002. The concentration of MTBE in the water sample <br /> collected on August 2, 2002, was 20,000 ug/I. A rapid response to investigate <br /> and remediate the MTBE is required. In addition, assessing the operating UST <br /> system as a potential source and repairing any leaks to prevent an ongoing <br /> release is required. <br /> According to Step 3 within the State Water Resources Control Board Guidelines <br /> for Investigation and Cleanup of MtBE and other Oxygenates (Guidelines)final <br /> draft dated 30 March 2000, sites with persistent concentrations of MtBE over <br /> 10,000 ppb should perform interim remediation to reduce the concentrations and <br /> mass before the plume can spread. Therefore, interim remediation at this site <br /> should be considered. <br /> N <br />