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. California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston H.Hickex <br /> Robert Schneider,Chair <br /> Secretaryfor Gray DavisFresno Branch Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/-rwgcb5 <br /> Protection 1685 E Street,Fresno,California 93706-2020 <br /> Phone(559)445-5116•FAX(559)445-5910 <br /> 28 February 2003 RECEIVED <br /> MAR 0 4 2003 <br /> i <br /> CheM Emircr^..n'.', ^ T M r <br /> Ms. Penny T. Fottrell <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW OF OFFSITE GROUNDWATER INVESTIGATION WORKPLAN,ROBERTS <br /> PROPERTY (FORMER VERNALIS PUMP STATION), VERNALIS,SAN JOAQUIN AND <br /> STANISLAUS COUNTIES <br /> We have reviewed the Soil and Groundwater Investigation Workplan, Roberts Property (Former <br /> Vernalis Pump Station)report, dated 13 February 2003 submitted by Geomatrix Consultants, Inc. on <br /> behalf of ChevronTexaco. The Workplan proposes collecting additional data regarding the crude oil <br /> pollution at the Roberts property at 35500 Welty Road in Vernalis. <br /> The Workplan summarizes the results of a data review and proposes six borings and two contingent <br /> boring locations to collect soil and groundwater samples to delineate the lateral and vertical extent of <br /> petroleum hydrocarbons downgradient of the site monitoring wells. <br /> During field work, the findings should be evaluated to determine if one or more of the borings should be <br /> converted to monitoring wells for future groundwater sampling. In accordance with ChevronTexaco's <br /> draft consistent technical approach (CTA), long term quarterly groundwater monitoring may be needed <br /> to confirm that concentrations of petroleum hydrocarbon are gradually decreasing as the mass is depleted <br /> over time. <br /> We concur with the installation of the borings and collection of samples at the locations proposed in the <br /> 13 February 2003 Workplan. Please notify Regional Board staff at least 48 hours prior to initiating the <br /> field activities. <br /> California Environmental Protection Agency <br /> 0 A <br /> Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways <br /> you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />