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M. Scott Mansholt - 2 - 31 July 2047 <br /> Mountain House #6 <br /> extent of petroleum hydrocarbon constituents. The contingency borings may be advanced <br /> based on visual observations during the initial field activities. <br /> According to the workplan, soil samples will be analyzed for TPHc, benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), and polynuclear aromatic hydrocarbons (PAHs). <br /> Groundwater samples will be analyzed for TPH as diesel (TPHd), BTEX, PAHs and three will <br /> be submitted for General Minerals analysis, at least one representative sample (soil and/or <br /> groundwater) will be submitted for fuel fingerprint analysis. <br /> Regional Water Board staff concurs with the proposed field investigation workplan. <br /> By 20 December 2007, please submit your investigative report of findings. Please notify <br /> Regional Board staff at least 48 hours prior to initiating field investigation activities. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> SHELTGN R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> cc: Michael lnfurna, San Joaquin County EHD, Stockton <br /> Mike Jenkins, SAIL, Sacramento <br /> Lee Higgins, SAIL, Chevron - San Ramon <br /> C DH1RICommcn10VPIMtn#61JU07 <br />