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_ FILE COPY <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> 'qul" SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> �: . 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> P Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Tele hone: 209 468-3420 <br /> 9�%FpR � P ( ) Margaret Lagorio,R.E.H.S. <br /> Laurie og Cornua,R.E.H.S. Fax: (209) 464-0138 Robert McClellan,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> EDWARD C RALSTON ` <br /> D <br /> CONOCOPHILLIPS <br /> 76 BROADWAY <br /> SACRAMENTO CA 95812 <br /> RE: Circle K Store / Service Station #01205 SITE CODE: 507198 <br /> 16470 Cambridge St. RO#:138 <br /> Lathrop, CA., 95330 <br /> WORKPLAN: "Addendum to Work Plan for Off-Site Assessment" <br /> DATED: October 13, 2003. <br /> PREPARED BY: Secor — Rusty Benkosky, P.E. <br /> STATUS: APPROVED (with conditions noted below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN IH&S <br /> 25299.37 subd(c)(3)l: <br /> • Two phase approach with phase one proposal to install five offsite <br /> GeoProbes, 12-15 feet deep to north, northeast, and east in <br /> continuing effort to define the lateral extent of the ground water <br /> petroleum plume and, <br /> • In phase two, install (1-5) shallow groundwater monitoring wells <br /> offsite in areas of concern as determined by Geoprobe phase and, <br /> • Analyze selected soil and all ground water samples for TPH as <br /> gasoline, BTEX, 1,2-DCA, EDB, MtBE, Ethanol, and the Oxygenates <br /> and submit the report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> `Response'/ proposal dated December 30, 2003, advised the Site <br /> Conceptual Model (SCM) will not be submitted to EHD until after the <br /> lateral and vertical delineation is completed. Also noted in this latest <br /> proposal was the intent to enter interim remediation (Ozone sparge) <br /> onsite to reduce the MtBE impact. With the highest MtBE ground <br /> water concentration now down gradient and offsite (MW-12), EHD is <br /> concerned that onsite interim (IRAP) action without a clear <br /> understanding of the MtBE migration and extents may not be cost- <br /> effective or practical. <br />