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Public Works, Stockton - 3 - 9 September 2022 <br /> soil gas wells in accordance with the 2015 joint agency guidance document <br /> Advisory—Active Soil Gas Investigations (Advisory), including the use of <br /> quantitative leak testing using tracer gas (Appendix C of the Advisory). Sample <br /> analysis should include at least total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene, and total xylenes (collectively BTEX), methyl tert <br /> butyl ether (MTBE), naphthalene, and oxygen concentration (for evaluation of a <br /> bioattenuation zone). <br /> If you have any questions or concerns regarding comments in this letter or regarding the <br /> Site, please contact Alan Buehler at (916) 464-4615 or by email at <br /> alan.buehlerCcDwaterboards.ca.gov. <br /> Alan M. Buehler, P.G. Galvin Kauffman, P.G. <br /> Engineering Geologist Senior Engineering Geologist <br /> cb5�oNAL OALcFo(c RICK o�� <br /> R ALAN M. BUEHLER <br /> No.9340 9542 r <br /> �P <br /> 9�OrCAO' ��rFor CAUFpQ <br /> cc: John Lane, Condor Earth Technologies, Stockton (email) <br />