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A1. Scott Mansholt - 2 - 16 August 2007 <br /> Chevron-Vernalis Pump StE. .-i <br /> detection limit [MDL] is 0.01 pg/L; the 0.012 pg/L value falls between the MDL and the method <br /> quantitation limit). <br /> SAIC proposed that, based on the recent and historic analytical documentation, the onsite <br /> petroleum affected groundwater plume is stable and defined and that sampling and monitoring <br /> be reduced to a semi-annual frequency. <br /> Based on our review, we have the following comments- <br /> • Regional Water Board staff concurs that the monitoring and sampling frequency be <br /> reduced to semi-annually at the former Vernalis Pump Station site-, and, <br /> • Until the downgradient extent of affected groundwater is defined offsite (downgradient), <br /> quarterly monitoring and sampling should continue for the Bogetti property monitoring <br /> wells. <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: James Simpson, Stanislaus County DER, Modesto <br /> Michael J. Infurna, San Joaquin County EHD, Stockton <br /> Lee Higgins, SAIC, San Ramon <br /> CDH/R\Common\Chev OVP VernalisPS Q2-07,Aug 07 <br />