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_ RECEIVE® <br /> JUN 3 0 2014 <br /> ENVIRONMENTAL HEALTH <br /> CCCGROUND ZERO PERMIT/SERVICES <br /> ANALYSIS,INC. <br /> 1172 Kansas Avenue,Suite A <br /> Modesto,CA 95351 <br /> 209.522.4119-PH <br /> 209.522.4227-FAX <br /> groundzeroanalysis.com <br /> June 24, 2014 <br /> Project No.: 723.2 <br /> Project Name: Valentine (Castle Motors) <br /> Mr. Nuel Henderson <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, CA 95205-6232 <br /> r Re: Indoor Air Intrusion Issue <br /> 6� Steve & Genes Service <br /> 2315 N. El Dorado St. <br /> Stockton, CA 95204 <br /> Site Code: 2080 <br /> Dear Mr. Hutchison: <br /> In response to your phone call on 6/5/14 and follow-up emails on 6/10/14, GZA is submitting <br /> this correspondence to address the issue with the potential of soil sourced petroleum vapor <br /> intrusion to indoor air space. <br /> According to the LTCP vapor exemption rule, an active service station includes actual <br /> pumping of fuel at a service station facility. This facility no longer dispenses fuel. Its <br /> business is servicing and repair of vehicles inside the shop. Although we understand that to <br /> Gqualify for the vapor exemption in the LTCP it specifically refers to sites that are active <br /> commercial fueling facilities, it is important to note that since the petroleum fumes generated <br /> during repairs of vehicles greatly exceeds that generated in your typical fuel station mini mart <br /> Cit would seem also appropriate to allow for an exemption of this type of business. Assuming <br /> this exception will not be granted; below we will utilize historical vapor removal and soil <br /> data to demonstrate vapor intrusion should not be considered a factor for closure under the <br /> LTCP. <br /> The table below shows Concentrations of Petroleum Constituents in Soil That Will Have No <br /> Significant Risk of Adversely Affecting Human Health from the Low-Threat Underground <br /> Storage Tank Case Closure Policy. <br />