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CST Station No. 3641 October 30, 2014 <br /> Stockton, California Baseline Assessment Report <br /> Soil samples were submitted to Kiff Analytical LLC (ELAP #08263CA) of Davis <br /> California. Selected soil samples (15 and 25-foot samples from each boring) were analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX), and the five fuel oxygenates <br /> methyl-t-butyl ether (MTBE), diisopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), tert- <br /> amyl methyl ether (TAME) and tert-butanol (TBA) by EPA Method 8260B. The 4-point <br /> soil cuttings samples were composited at the laboratory and analyzed for TPHg, BTEX, <br /> MTBE by EPA Method 8260B and for total lead by EPA Method 6010. The analytical <br /> report is attached. <br /> Results <br /> Soils encountered consisted predominantly of silty sand with subordinate sandy silt and silty <br /> clay. Analytical data reported no TPHg, BTEX, or fuel oxygenate concentrations above <br /> reporting limits in any soil boring sample. The sole analyte detected in the soil cuttings <br /> composite sample was total lead at a concentration of 4.7 milligrams per kilogram (parts per <br /> million); this is within the range of naturally-occurring background lead concentrations. <br /> Limitations <br /> The investigation documented in this report was conducted in accordance with the attached <br /> Field Methods and Procedures and generally accepted standards of environmental practice <br /> in California at the time of the investigation. The investigation was conducted solely for the <br /> purpose of evaluating subsurface environmental conditions with respect to fuel-related <br /> hydrocarbons. No soil engineering or geotechnical references are implied or should be <br /> inferred. Evaluation of the geological and environmental conditions at the site was based on <br /> a limited number of investigation points. Subsurface conditions may vary at locations other <br /> than those documented in this report. This report is the property of Horizon Environmental <br /> Inc. and CST Brands and was prepared for CST Brands for their sole use and distribution. <br /> Contact Horizon at 916-939-2170 if you have any questions or re�;�erk [o�� <br /> information. <br /> Sincerely, <br /> HORIZON ENVIRONMENTAL INC. p� �r <br /> PCO, <br /> rvm <br /> t <br /> L <br /> Gary Barker Rexford Smith, P.G. No. 5307 ti.! 4} <br /> Senior Project Manager Project Manager <br /> Attachments Figure 1: Site Map <br /> Boring Logs <br /> Analytical Reports <br /> Field Methods and Procedures <br /> 3641 Baseline Assnmt Oct I4.doc <br /> Project No. 1641.01 2 HORIZON ENVIRONMENTAL INC. <br />