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M. Scott Mansholt -2 - 25 June 2009 <br /> Chevron <br /> US Lan-Welty Road <br /> Central Valley Water Board staff has the following comments: <br /> ■ Prior to destroying the three monitoring wells, an additional sampling event should be <br /> conducted by SAIC field staff in conjunction with Central Valley Water Board staff. <br /> Central Valley Water Board staff will obtain/submit duplicate groundwater samples for <br /> analysis. <br /> • Historically, groundwater has declined to depths below well screen intervals and <br /> frequently samples could not be collected. Prior to scheduling the sampling event, <br /> depth to water measurements should be obtained to confirm that adequate water is <br /> available. <br /> • After reviewing available analytical results, Central Valley Water Board staff will re- <br /> evaluate SAIC's proposal for well destruction. <br /> By 31 July 2009, please provide a sampling schedule if it is confirmed that the wells contain <br /> sufficient water. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> ry-w- k � rs. nlo. 483D <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geolo i Engineering Geologist <br /> P.G. No. 8357 <br /> cc: Amy Terrell, RWQCB, Sacramento <br /> Harlan Knoll, San Joaquin County EHD, Stockton <br /> Norm Hunter, Kentfield <br /> Michael Hurd, SAIC, Oakland <br /> Michael Jenkins, SAIC, Sacramento <br />