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ENVIRONMENTAL HEALTH DEPARTMENT <br /> 'o PgUiry CD <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Bergman,R.E.H.S. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> • �q�/FORN`P • Program Manager Telephone: 468-3420 Douglas W.Wilson,R.E.H.S. <br /> 209 <br /> Laurie A.Colons,R.E.H.S. p ( Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> EDWARD RALSTON HARDEV & AMARJIT KHINDA ETAL <br /> CONOCOPHILLIPS 27000 S LEEWARD <br /> 76 BROADWAY TRACY CA 95304 <br /> SACRAMENTO CA 95812 f 'L <br /> RE: Circle K / TOSCO-Service Station #01205 SITE CODE: 5�7T9S E COPY <br /> 16470 Cambridge Drive. RO#:0000138 <br /> Lathrop, CA., 95330 WORK PLAN: "Additional Vertical Site Assessment" F90 <br /> DATED: August 17, 2005 <br /> PREPARED BY: Secor – Rusty Benkosky, P.E. <br /> TAS— APPROVED (with conditions noted below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S <br /> 25296.10. subd(c)(3)1: <br /> • Install one intermediate depth (55' bgs), 2-inch PVC monitoring well <br /> offsite and three (3) deep (75' bgs), 2-inch PVC monitoring wells on and <br /> offsite thru steel conductor casings for vertical petroleum ground water <br /> plume investigation as required by EHD and, <br /> • Analyze selected soil samples (at least one per every vertical ten feet) <br /> and groundwater samples for TPH as gasoline, BTEX, 1,2-DCA, EDB, <br /> Ethanol, MtBE and other Oxygenates by 8260B and, <br /> • Update the area receptor survey and provide the well construction <br /> details for Lathrop Grammar School's irrigation well and, <br /> • Submit a report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> • Submit copies of City of Lathrop encroachment permit and two EHD <br /> well installation permit applications and fees in a timely manner. <br /> • All grout annular spaces shall not be less than 2-inches and, <br /> • The report of findings to be in the format of an updated Site Conceptual <br /> Model (SCM). <br /> • Add new monitoring wells to quarterly sampling and reporting. <br /> REASONS FOR DISAPPROVAL OF THE WORK PLAN [H&S 25296 10 <br /> subd(c)(3)1: <br /> • none <br /> z� <br /> DATED: September 28, 2005. BY: Ze, 6�f <br /> Michael Infurna, REH (209) 468-3454 <br /> [X]Faxed to consultant on: 9-28-2005 <br />