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Tony Gonzales Trucking 2 - 13 December 2007 <br /> Escalon, San Joaquin Cour") <br /> all of the above constituent with better detection limits at a reduced cost, and is more <br /> reliable (fewer false positives) than USEPA Method 8021. Additionally, there are labs <br /> that now include Total Petroleum Hydrocarbons as gasoline (TPHg) by USEPA Method <br /> 82608, instead of the USEPA Method 8015 Modified. Use USEPA Method 8260B for <br /> BTEX, and for TPHg, if possible. <br /> f <br /> 3) There is a question whether mobile labs are capable of reaching adequate lower soil <br /> gas sample detection limits for comparison of the benzene and other risk driver results <br /> to regulatory limits.. If the mobile lab detection limits are above the TIER 1 limits <br /> (California Human Health Screening Levels and San Francisco Bay Regional Board <br /> Environmental Screening Levels) or sample results fail-a TIER 1 screening, then <br /> conduct a TIER 2 Risk Assessment. Use of a Johnson and Ettinger Model would fulfill <br /> the requirement for conducting a TIER 2 Risk Assessment. <br /> Please acquire.all necessary drilling clearances and permits, and give the San- Joaquin County , <br /> P Y 9 Y <br /> Environmental Health Department and myself at least three working days- prior notice for <br /> fieldwork. If you have any questions, please contact me at (916) 464-4615•or by email at <br /> jbarton@waterboards.ca.gov. <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br /> Ms. Lorie Duncan, San Joaquin County Environmental Health Services, Stockton <br /> Mr. Eric Price, Ground Zero Analysis, Inc., 1714 Main St., Escalon 95320 <br /> j - I <br />