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ENVIRONMENTAL HEALTH DEPARTMENT <br /> 1 Pq l!+ry <br /> Donna K Heran,R E H S <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> y Director 304 East Weber Avenue, Third Floor Carl Borgman,R E H S <br /> Al Olsen,R E N S Stockton, California 95202-2708 Mike lasWHuggins,R E x s,R D 1 <br /> Douglas W Wilson,R E H S <br /> C'QCr <br /> r- 3VO4" Laurie A Cotlla,R E H 3 program uMan Fax ( <br /> Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> F209)464-0138 Robert M(-Clellon,R E H S <br /> Program Manager Mark Barcellos R E H S <br /> Lorre Islas <br /> City of Stockton <br /> 425 North El Dorado, Room 301 <br /> ' Stockton, CA 95202 <br /> RE FORMER CHASE CHEVROLET FACILITY APR 14 2004 <br /> 424 VAN BUREN <br /> STOCKTON, CA 95203 <br /> WORKPLAN Soil and Groundwater Investigation Work Plan <br /> DATED Aril 7 2004 PREPARED BY Treadwell &Rollo <br />' X APPROVED with Conditions (See Below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299 37,subd (c)(3) ): <br /> 1 Removal of approximately 684 cubic yards of contaminated soil in a 30 foot-long by <br />' 28 foot-vide by 22 foot-deep excavation at the site near the location of the former <br /> rnomtonng well MW-3 The excavation will be facilitated with shoring <br /> 2 De-watering of 12,000 gallons to 30,000 gallons of contaminated groundwater <br /> expected to come into the excavation <br /> 3 Characterization of excavated stockpiles by sampling and analyses <br /> 4 Characterization of the de-watered contaminated groundwater by sampling and <br /> analyses <br /> 5 Disposal of contaminated soil to off-site facilities <br /> 6 Potential (on-site) reuse of overburden soil of analytical results of the samples <br /> indicate the soil to be clean <br /> COMMENTS AND CONDITIONS <br /> 1 Contaminated and clean stockpiles should be segregated The soul is determined <br /> clean only if both geologist/project manager and EHD staff on site concurred based <br /> on field observation and field data from organic vapor meter such as an photo <br /> ionization detector (PID) <br /> 2 One soil sample should be collected per 100 yards of clean excavated soil <br /> 3 Contaminated soil scheduled to be disposed off site should be characterized <br />' according to the requirements of the accepting facility <br /> 4 Groundwater de-watered from the excavation should be stored in a baker tank and <br /> characterized before disposal <br /> RECEIVED <br /> t APR IS 2004 <br /> TRMWELL & ht ,U) <br />