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! r <br /> Former Arco Gas # 443 Page 2 of 2 <br /> 2478 E. Oak Street January 06, 2014 <br /> Stockton, California 95205 <br /> In addition, B & A proposes to perform a leak test simultaneously while purging to check <br /> the integrity of the soil gas sample by ensuring that ambient air is not introduced into it. A <br /> helium shroud connected to the aboveground sample train will be used to perform the leak <br /> test. The EHD recommends that if the shroud is infused with the tracer helium compound, <br /> allow at least five minutes prior to sample collection. This allows the tracer compound <br /> time to equilibrate. Refer to Department of Toxic Substances Control, April 2012, Active <br /> Soil Gas Advisory Investigations. <br /> Please contact Angelica Sandoval Man at (209) 468-2807 or amarin@sjcehd.com if you <br /> have any questions. <br /> Sinc e <br /> Angelica Sand , REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, CVRWQCB, Underground Storage Tank Unit, 11020 Sun <br /> Center Drive, #200, Rancho Cordova, CA 95670-6114 <br /> Mr. Kirk Larson, Underground Storage Tank Cleanup Fund, State Water <br /> Resources Control Board, P.O. Box 944212, Sacramento, CA 94244-2120 <br /> Mr. Sergio Moreschalchi, Atlantic Richfield Company, P.O. Box 1257, San <br /> Ramon, CA 94583 <br /> Mr. Rob Miller, Broadbent & Associates, Inc., 2000 Kirman Avennue, <br /> Reno, NV 89502 <br /> Mr. Rahul Chalke, Broadbent & Associates, Inc., 875 Cotting Ln., Suite G, <br /> Vacaville, CA 95688 <br />