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M. Scott Mansholt— Chevron - 2 - 11 October 2007 <br /> US Can-Welty Road Workplan <br /> • Soil and/or groundwater samples with obvious presence of crude oil will be submitted <br /> for fuel fingerprint analysis to evaluate the potential source of the petroleum <br /> hydrocarbons encountered; <br /> • Sample depths will be chosen to be consistent with future environmental screening risk <br /> assessment purposes and for lateral and vertical delineation evaluation; and, <br /> • Groundwater samples will be obtained from two borings and submitted for analysis of <br />' General Minerals water quality parameters. <br /> Based on our review of the SAIC workplan, we have the following comments: <br /> e Regional Water Board staff concurs with the plan for advancing additional borings for <br /> soil and groundwater sampling and destroying the three monitoring wells; and, <br /> • The monitoring well destruction documentation, including a copy of the San Joaquin <br /> County permit, should be included with the soil and groundwater investigation report. <br />' By 1 April 2008 pleaserovide the well destruction results and <br /> p . the soil and groundwater <br /> investigation report. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br />' P.G. No. 6357 <br /> cc: Amy Terrell, RWQCB, Sacramento <br /> Harlan Knoll, San Joaquin County EHD, Stockton <br /> Norm Hunter, Kentfield <br /> Lee Higgins, SAIC, San Ramon <br /> Mike Jenkins, SAIC, Sacramento <br /> CDH/R\CommonChavOVPWS Can,soil/GW WP,Oct 07 <br /> 1 <br />