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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Karl E. Longley,SO), Ply, Chair i <br /> Linda S.Adams Arnold <br /> Secrelalyfor Fresno Branch Office <br /> 1685 E Slreel,Fresno,California 93746 Schwanenegger <br /> r"rrviran�rienicrl Gayerrmr <br /> Proreelion (554)445-5116•Fax{5 59)445-5910 <br /> ht(p.11ivtiv%,v.waleirboards.ca.gov/centraIvaIley <br /> ER=EIVED <br /> ­] <br /> 4 May 2007 <br /> R 2007 <br /> ig maWMW c4. <br /> --------------- <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> Rm K2066 <br /> San Ramon, CA 94583-2324 <br /> REVIEW OF SOIL AND GROUNDWATER INVESTIGATION WORKPLAN, VERNALIS <br /> OFFSITE, BOGETTI PROPERTY, VERNALIS, SAN JOAQUIN AND STANISLAUS <br /> COUNTIES <br /> Regional Water Board staff has reviewed the referenced workplan, dated 30 April 2007 and <br /> submitted by Science Applications International Corporation (SAIC) on behalf of Chevron. The <br /> site is located southeast of the intersection of California Highway 33 and Welty Road south of <br /> Vernalis. The adjacent properties' land use is primarily for agricultural crops, light industrial <br /> purposes and some rural residences; the Bogetti property land use is for agricultural purposes. <br /> The associated former Vernalis Pump Station site is west of Highway 33. <br /> In 2006, SAIC completed a soil and groundwater investigation at the former Vernalis Pump <br /> Station site and on the Bogetti property consisting of borings to collect soil and groundwater <br /> samples for laboratory analysis of the petroleum hydrocarbon constituents of concern. SAIC <br /> concluded, and Regional Water Board staff concurred, that soil and groundwater conditions <br /> had been adequately delineated on the pump station site, but petroleum affected groundwater <br /> had not been defined downgradient on the Vernalis Offsite (Bogetti) property. <br /> The current workplan proposes to advance seven borings on the Bogetti property and the <br /> Highway 33 right-of-way to obtain soil and groundwater samples for analysis of the petroleum <br /> constituents of concern. Provided petroleum-affected soil or groundwater is encountered, at <br /> least one representative sample from each medium will be submitted for analysis. In addition, <br /> the groundwater samples will be analyzed for "general minerals" water quality parameters. <br /> Regional Water Board staff concurs with the proposed field investigation workplan. <br /> By 1 October 2007, please submit your investigative report of findings. <br /> California Environmental Protection Agency <br /> vo Recycled Paper <br />