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t � <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> N :{ Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> c9' •..£.• ' �P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> F o R Linda Turkatte,RENS <br /> Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> January 16, 2013 <br /> Ms. Yvonne Miller <br /> A.R. and M.E. Glover Trs. <br /> Fayette Manufacturing Corporation <br /> P. O. Box 336 <br /> Tracy, California 95376 <br /> Subject: Former Fayette Manufacturing <br /> 7675 W. Eleventh Street <br /> Tracy, California 95304-8831 <br /> Dear Ms. Miller: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Work Plan for Soil Gas Investigation at Former Fayette Manufacturing Site (work plan), dated 02 <br /> January 2013, prepared by your consulting firm, Cardno ATC, on your behalf. The work plan <br /> was submitted in response to the EHD letter dated 30 October 2012 directing submittal of a <br /> work plan that includes proposals to collect soil gas and indoor air samples and evaluate the <br /> results from the data collected. <br /> In the work plan, Cardno ATC proposes to: <br /> • Advance three soil borings to total depth of approximately five feet below surface grade <br /> (bsg) using either direct push technology or a 2.5-inch-diameter hand auger to install <br /> temporary soil vapor probes at locations illustrated on Figure 2 of the work plan. <br /> • Construct three soil vapor probes using 0.25-inch outer diameter Teflon tubing fitted with <br /> a stainless steel wire screen tip implant at the base of the vapor probe. <br /> • Backfill the bottom of the borings with four to six inches of 2/12 Monterey sand around <br /> the screen tip and overlay the sand with hydrated granular bentonite to seal the annular <br /> space above the sampling interval. <br /> • Allow an equilibration period of at least two hours following the installation of the soil <br /> vapor probes by direct-push technology and forty-eight hours by hand auger installation. <br /> • Purge three volumes of air using a 60-milliliter (mL) (not millimeter) syringe prior to <br /> connecting the vapor probe assembly to a 400-mL Summa canister fitted with a 200 mL <br /> per minute flow restrictor for sample collection. <br /> • Spray 1,1-difluoroethane (1,1-DFA) onto cotton rags in a plastic bag and place the rags <br /> adjacent to the above-ground connections of the soil vapor probe system to check for <br /> leaks prior to sampling. (The use of a shroud is proposed if conditions are windy.) <br />