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t 1 l 1' <br /> Advanced <br /> GeoEnvironmental, Inc . ~o <br /> 26 May 2009 <br /> AGE-NC Project No. 02-0962 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department- <br /> 600 East Main Street <br /> Stockton,California 95201 <br /> Subject: Revision to Quarterly Update-First Quarter 2009 <br /> VANCO TRUCK&AUTO PLAZA <br /> 1033 West Curter Way,Stockton,California <br /> Dear Mr. Infurna: <br /> On behalf of Mr. David Atwater of Van De Pol Enterprises, Advanced GeoEnvironmental, Inc. <br /> (AGE)has prepared this revision to the Quarterly Updat -First Quarter 2009,dated 30 April 2009, <br /> for Vanco Truck&Auto Plaza,located at 1033 West C iarter Way, Stockton CA(site). <br /> AGE had previously prepared the Quarterly Update - First Quarter 2009 and notified the San <br /> Joaquin County Environmental Health Department ( HD) that a soil vapor investigation (i.e. <br /> collection of two soil vapor samples)would be performed during the third quarter 2009. The EHD <br /> had previously directed the performance of a soil vapor intrusion evaluation by letter dated 24 March <br /> 2009. The evaluation was directed based upon diesel ' pact encountered at the site exceeding the <br /> San Francisco Bay Regional Water Quality Control oard's Environmental Screening Levels <br /> (ESLs).However,after further review of the soil data,A E believes that residual soil contamination <br /> left in place will not pose a significant threat to human an al <br /> or to the environment.The following <br /> is submitted for your consideration: <br /> • The Vanco site is surfaced by either concrete or asphalt, thereby creating a barrier for <br /> potential soil vapor direct exposure.. . <br /> • The Vanco mire-mart building was built on concrete slab, thereby creating a barrier for <br /> potential soil vapor direct exposure. <br /> • Diesel is a longer-chain(i.e. heavier) hydroc n and isnot generally considered to be a <br /> volatile compound. <br /> • There is no soil=vapor California EPA Human Health Screening Level(CHHSL)for diesel. <br /> • Diesel has not been identified as a "known inogen" by either the Environmental <br /> Protection Agency nor the California Environmental Protection Agency. <br /> • The Vanco site will remain a commercial petrol fueling station for the foreseeable.-future.- <br /> 837 <br /> oreseeable future.837 Shaw Road,Stockton,California 95215 <br /> Telephone(209)467-1046 Fax 209)467-1118 <br />