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IV <br /> San Joaquin County <br /> p <br /> Environmental Health Department DIRECTOR <br /> Z �G Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> i:►' Jeff Carruesco,REHS,RDI <br /> 9LKasey Foley,REHS�FOR� Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser, REHS <br /> March 18-2�1� i <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 j <br /> Revised Work Plan for Soil Gas Investigation at Former Fayette Manufacturing Site (work.plan), <br /> dated 06 March 2013, prepared by your consulting firm, Cardno ATC, on your behalf. The work <br /> plan was submitted in response to,the EHD letter dated.16 January 2013 directing that the <br /> original work plan be resubmitted after addressing bulleted items listed in the EHD letter <br /> concerningthe collection of soil as, indoor and ambient air samples and evaluation of the <br /> 9 <br /> results from the data collected. <br /> I <br /> I� Although Cardno ATC did not provide the room location of the one indoor air sample and the <br /> approximate location of the one ambient air sample proposed to be collected upwind, the EHD <br /> approves the work plan with these conditions: <br /> I <br /> • If a rotohammer drill is used in conjunction with a drill rod to advance the borehole prior <br /> to installing the soil vapor probe, the equilibration time is two hours; however, if the <br /> rotohammer drill Is used with an auger-type attachment, the equilibration time is twenty- <br /> four hours. <br /> • When constructing each vapor probe, after backfilling the bottom of the boring with sand <br /> 9 <br /> to a height several inches above the probe tip, emplace approximately six to twelve <br />�I <br /> inches of dry granular.bentonite before emplacing the pre-hydrated bentonite Into the <br /> boring. (The purpose of the dry bentonite is to prevent hydrated bentonite from <br /> infiltrating the sand pack.) <br /> When calculating the purge volume, include the void space of the dry bentonite in the <br /> annular space in addition to the internal volume of tubing, the annual space around the <br /> probe tip, and the tubing volume of the above ground sampling assembly. <br /> When purging and collecting soil gas samples, maintain a vacuum of less than or equal <br /> to one-hundred inches of water. <br />