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AL HORIZON ENVIRONMENTAL INC, <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation. GT- <br /> July 27,2010 <br /> Mr. Michael 1. Infurna Jr. ' <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stoekton, California 95202-3029 <br /> Subject: Soil Gas Investigation Report <br /> r Beacon Station.No. 3641; <br /> 1210 East Hammer Lane., Stockton, California <br /> Mr. Infurna: <br /> I <br /> At .the request of Ultramar Inc. (Ultramar), Horizon Environmental (Horizon) has prepared <br /> this report documenting the results of,a soil gas investigation (SGI) conducted'at the subject <br /> F site located in San Joaquin'County; California as shown on Figure 1. Ili a.letter dated 21 <br />` August 2008, the San Joaquin 'County Environmental„t'Health .Department (EHD) <br /> recommended submittal of an SGI work plan on the basis!'.of California Regional. 'Water <br /> Quality Control Board (RWQCB) closure evaluation requirements. Horizon proposed:`the <br /> SGI in a work plan dated 30 Octo* 2009 (Work Plan). In a;16 November 2009 letter, the <br /> EHD advised Ultramar that it.may be acceptable to address'the risk of vapor intrusion 'by <br /> technical justification and 'comparison of site data with .San Francisco Bay RWQGB <br />' environmental screening levels (ESLs). Horizon submitted Technical Justification for No <br /> 1i Soil Gas Investigation dated 29 .December 2009. In a 2 February 2010 letter] the EHD <br /> stated non-concurrence with the technical justification and directed-Ultramar W conduct an <br /> -SGI between the station building and the .underground storage tanks (USTs): 'In an <br /> electronic mail dated 19 April 2010, Horizon requested utilizing the single°soil -gas probe <br />+, location SG-3 between the station building and the.USTs as proposed in the 30 October <br /> 2009 Work Plan, In a letter dated 4 May 2010,-the EHD granted approval ofthe.19 April <br /> 2010 proposal with the -condition that one additional soil gas probe be installed <br /> approximately 30 feet south of SG-3, The EHD correspondence,is attached: <br /> The purpose of the SGI was-to collect data on which to evaluate the potential for soil.,gas <br /> that may exist-in the subsurface to inirude into the.station building. This SGI report has <br /> been prepared in general accordance with reporting recommendations. contained in.Tri- <br /> Regional Board.Staff Recommendations for Preliminary Investigatr!on and Evaluation. of <br />{ Underground Tank Sites dated 1.6 April 2004. <br /> Site Description and Background. <br /> The Site is an operating service station located on the southwest corner of the intersection of <br /> East Hammer Lane and Kathleen Drive in Stockton; California as shown.on Figure 2. 'Site <br /> facilities include a service station/convenience store, two canopy-covered-dispenser islands <br /> i <br /> f 4970 Windplay Drive,#C5 • EI Dorado Hills,CA 95762 (916)939-2170 FAX(916)939-2172 <br />` P.O.Box 5283 Bakersfield,CA 43388 {661,)589-8389 FAX(661)589-1456 <br /> I <br /> F . <br /> I - <br />