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M. Scott Mansholt - 2 - 8 May 2008 <br /> Chevron — US Can-Welty Road <br /> Regional Water Board staff has the following comments: <br /> • Previously, by letter of 11 October 2007 we concurred that, since groundwater <br /> elevations had dropped and had been below the screened levels for some time, MW-3, <br /> 4, and 5 could be destroyed; however, it appears that groundwater has recovered <br /> sufficiently to provide sufficient water for sampling of MW-3 and 4; <br /> • We concur that MW-4 and 5 should be destroyed (approved in our 11 October 2007 <br /> letter) and we concur that MW-3 should not be destroyed at this time and that <br /> groundwater monitoring and sampling should continue until an analytical trend is re- <br /> established; and, <br /> • The due date for the Additional Sail and Groundwater Investigation and Well <br /> Destruction workplan was revised due to site access issues. <br /> By 31 October 2008, please provide the results of the Soil and Groundwater Investigation and <br /> the details of destruction for MW-4 and 5. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5170. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 5357 <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 /> C D H I R\S taffC hevOVP\U S CaWAn u 108 GWrpV8May08 <br />