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Chevron Products Company 2 <br /> Chevron Service Station 9 2396 25651 Hi hwa 99 1Vorth Acam o CA 3/18102 <br /> • Permitting The applicable permits required for the installation of groundwater <br /> • monitoring wells will be obtained from San Joaquin County prior to commencing <br /> drilling <br /> • Soil Selection and Analysis. Soil samples will be collected at approximately 5-foot <br /> intervals and selected samples will be submitted under chain-of-custody procedures to <br /> a California state-certified laboratory for analysis of TPHg using Environmental <br /> Protection Agency (EPA) Method 8015 modified, and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), and methyl tertiary butyl ether (MtBE) using <br /> EPA Method 8260 <br /> • Monitoring Well Development and Sampling. Following well installation, the <br /> monitoring wells will be developed by rigorously surging the wells over the length of <br /> the screen interval and by purging approximately 10 casing volumes of water After <br /> well development, groundwater samples will be collected and submitted under <br /> standard chain-of-custody procedures to a California state-certified laboratory The <br /> groundwater samples will be analyzed for TPHg using EPA Method 8015 modified <br /> and BTEX and MtBE using EPA Method 8260 <br /> • Well Surveying and Groundwater Gradient Interpretation. A state-licensed <br /> surveyor will survey the newly installed wells Depth to groundwater measurements <br /> will be collected during sampling activities and utilized for interpretation of <br /> groundwater flow and gradient beneath the site <br /> • Report. A report will be prepared after completion of necessary field work The <br /> report will include soil boring logs, soil and groundwater analytical results, chain-of- <br /> custody documentation, groundwater gradient map, and conclusions <br /> Field and laboratory procedures are presented as Attachment A <br /> SCHEDULE <br /> SECOR is prepared to initiate field work coordination within 4 weeks following approval of <br /> this work plan by the San Joaquin County Environmental Health Division and the securing of <br /> the appropriate permits A report documenting the findings of the well installation is <br /> anticipated to be submitted approximately 8 to 10 weeks after the completion of the field <br /> work and the receipt of all analytical data <br /> Chevron 9-2396/I IChevron1923961ReportslWP for MW installation doc <br />