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Lee Higgins -2- 6 July 2011 <br /> Chevron Environmental ManagemE___ ;ompany <br /> • Contingent step-out borings will be advanced if stained soil is observed in the original <br /> samples. The locations of potential step-out borings will be determined based on <br /> results of the primary sampling activities. <br /> • Soil samples will be submitted for analysis of total petroleum hydrocarbons as crude oil <br /> (TPHc); benzene, toluene, ethylbenzene, and xylenes (BTEX); and polynuclear <br /> aromatic hydrocarbons (PAHs). <br /> • Groundwater samples will be collected from the soil borings noted above. If TPH <br /> affected soil is observed a groundwater sample will not be collected and the location for <br /> a step-out boring with sampling will be evaluated. <br /> • Groundwater samples will be submitted for analysis of TPH as diesel (TPHd), BTEX, <br /> and PAHs. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed and concurs with the Workplan with the following comment.. <br /> • At least one soil sample exhibiting TPH affected soil should be submitted for fuel <br /> fingerprint evaluation. <br /> By 15 December 2011, please submit the soil and groundwater investigation report. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179 or <br /> by email at dhubbard(cD_waterboards.ca.gov. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> CC'. Michael J. Infurna, San Joaquin County DEH, Stockton <br /> Gary Foote, AMEC, Oakland <br />