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San Joaquin County DIRECTOR <br /> N '� Donna Ht:ran.REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cctulla.REHS <br /> Stockton, California 95202-3029 <br /> .1 J PROGRAM COORDINATORS <br /> f - -- -- ---- Carl Borgman, REHS <br /> 60 Margaret Website: www.sjgov.org/ehd Mike Huggins, RENS.RDI <br /> Margaret I_agorio, REHS <br /> Phone: (209)468-3420 Robert McClellcn. REHS <br /> Fax: (209)464-0138 Jeff Carruesco. REHS, RDI <br /> Kasey Foley.REHS <br /> May 23, 2008 <br /> Stephanie Furgal <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Rd., RM K2240 <br /> San Ramon. CA 94583 <br /> Subject: Former Chevron 49-4054 Site Code: 1780 <br /> 2103 Country Club Blvd. RO#: 0000635 <br /> Stockton, CA 95204 Global ID#: T0607700063 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Ground <br /> Water Assessment (Plan) dated May 5, 2008 prepared by Arcadis Consulting and offers the following <br /> comments. <br /> The Plan is in response to the requirement from the EHD to continue the subsurface investigation for <br /> vertical plume delineation, and includes the installation of five additional monitoring wells (MW-4D onsite <br /> and MW-9D, MW-12B, MW-12C, and MW-12D offsite) through steel conductor casings. <br /> The Plan is necessary and will be adequate [H&S Code 25296(c)(3)] with the following requirements <br /> included: <br /> • Selected soil and initial ground water samples from each well are to be analyzed for tert-butyl <br /> alcohol (TBA) by EPA Method 8260B. <br /> • Centralizers are to be installed at the bottom, middle, and close to the top of each steel conductor <br /> casing so that a minimal 2-inch grout annulus will be provided between the outer diameter of the <br /> conductor casing and the borehole. <br /> No addendum is needed for this phase of work as long as the above noted items are included in the work <br /> phase. You may start procedures with San Joaquin County Public Works Department to secure the <br /> required encroachment permit(s)to install the wells in the county right of way. Please submit a copy of the <br /> encroachment permit(s)along with the two EHD Well Permit Application Forms and $89 fee each. <br /> You may contact Michael Infurna, Senior Registered Environmental Health Specialist, at (209) 468-3454 <br /> should you have any questions or wish to discuss the site. <br /> Donna Heran, REHS, Director <br /> Environmental Health De en <br /> i'lii�id �, <br /> Michael J. Infurna Jr., R S Margaret Lagorio, REHS <br /> Senior Registered Environmental Health Specialist Program Coordinator <br /> C.' Mr. James L. Barton, -CVRWQCB, 11020 Sun Center Dr.,#200, Rancho Cdr ;CA 9fi670 <br /> Mr. David Evans—Arcadis, 950 Glenn Drive, #125, Folsom, CA 95630 <br /> Mr. John Craig—PO Box 691295, Stockton, CA 95269 <br /> Ails. Robin Ringstad -2421 Franklin Ave, Stockton, CA 95204 1 i <br />