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H <br /> I <br /> CONESTOGA-ROVERS <br /> & ASSOCIATES <br /> May 4, 2009 4 Reference No. 632277 <br /> Samples will be analyzed on standard turn around time. CRA's Standard Field Procedures is presented as <br /> Attachment C. <br /> Leak Detection: In order to detect any leakage of atmospheric gasses and/ or ambient air during <br /> sampling, CRA will perform leak detection tests. Helium will be used as a source gas for leak detection. <br /> Field application of helium will be accomplished through using a containment structure (i.e. a clear, large <br /> volume RubbermaidO or Tupperware@ storage container) placed inverted over the entire sample probe <br /> and sampling apparatus. <br /> Soil Disposal: Soil cuttings produced during field activities will be temporarily stored in DOT approved <br /> drums on-site. Following review of laboratory analytical results, the soil will be transported to a Chevron <br /> approved facility for disposal/recycling. <br /> Vapor Chemical Analyses: The soil-vapor samples will be kept at ambient temperature and submitted <br /> under chain-of-custody to Air Toxics of Folsom, California, for analysis. The samples will be analyzed on <br /> a standard turn around time for: <br /> • Total petroleum hydrocarbons as gasoline (TPHg) by EPA Method TO-3; <br /> • Benzene, toluene, ethylbenzene, and xylenes (BTEX), and methyl tertiary butyl ether (MTBE) by EPA <br /> Method TO-15; and <br /> • Helium, oxygen, and carbon dioxide by Method ASTM 1946. <br /> Soil Chemical Analyses and Soil Parameters: Soil samples from the soil vapor borings will be analyzed <br /> on a standard turn around time for the following analytes: <br /> • TPHg and total petroleum hydrocarbons as diesel (TPHd) by EPA Method 8015B; and <br /> • BTEX and MTBE by EPA Method 8260B. <br /> Reporting: After the final analytical results are received, CRA will prepare an investigation report that at <br /> a mimmum contains: <br /> • A summary of the site background and history; <br /> • Descriptions of the drilling and sampling methods; <br /> • A Figure illustrating the boring locations; <br /> • Boring logs; <br /> • Tabulated soil analytical results; <br /> • Tabulated vapor analytical results; <br /> • Analytical reports and chain-of-custody forms; <br /> • Soil disposal methods; <br /> • CRA's conclusions and recommendations; and <br /> • Responses to SJCEHD comments noted in their March 26, 2009 letter. <br /> Worldwide Engineering, Environmental, Construction, and IT Services <br />