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\ California Regional Water Quality Control Board a <br /> Central Valley Region 3. <br /> Robert Schneider,Chair <br /> Terry Tamminen Fresno Branch Office Arnold Schwanenegger <br /> Secretatyfor Internet Address: http://www.swrcb.ca.gov/—nvgcb5 Governor <br /> Environmental 1685 E Street,Fresno,California 93706 <br /> Protection Phone(559)445-5116•FAX(559)445-5910 <br /> 9 July 2004 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW OF WORK PLAN—ADDITIONAL SOIL BORINGS AND INSTALLATION OF <br /> MONITORING WELLS, FORMER VERNALIS PUMP STATION, VERNALIS, SAN JOAQUIN <br /> AND STANISLAUS COUNTIES <br /> We have reviewed the workplan, dated 29 June 2004, for the ChevronTexaco Old Valley Pipeline (OVP) <br /> project at the Former Vernalis Pump Station site located near Vernalis. The site consists of two separate <br /> properties - the north portion is referred to as the Bellini (former Roberts) property and the south portion, <br /> the Arcos property. <br /> You have proposed the following tasks for the investigation: <br /> • Advance soil borings at eight downgradient locations and one soil boring upgradient of existing <br /> monitoring wells and/or former boring locations; collect soil and groundwater samples for <br /> analysis to delineate the extent of impacted soil and groundwater. Up to five contingency step-out <br /> borings are proposed if impacted soil is encountered in the original borings. <br /> • Advance borings for installation of five monitoring wells, one upgradient and four downgradient <br /> locations. <br /> • Initiate and conduct quarterly groundwater monitoring for a minimum of four consecutive <br /> quarters using the four existing wells and the five proposed wells that will be installed. <br /> • Conduct a search of Department of Water Resources (DWR) records to detennine if there are <br /> domestic, municipal, irrigation, or other production wells within a 2,000-foot radius of the site. <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />