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66,19- <br /> 0 0 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> v Robert Schneider,Chair <br /> Arnold Schwarzenegger <br /> Terry Tamminen Fresno Branch Office Governor <br /> Secretaryjor Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Environmental 1685 E Street,Fresno,California 93706 <br /> Protection <br /> Phone(559)445-5116•FAX(559)445-5910 ' <br /> 3 June 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 WORKPLAN—ADDITIONAL INVESTIGATION, 990 BEECHNUT PROPERTY, <br /> TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the Workplan, dated 28 May 2004, for the ChevronTexaco Old ValValu iesi eliwestern OVP) <br /> project at the 990 Beechnut property located in Tracy. The 990 Beechnut property p <br /> portion of the former TAOC Tracy Pump or ChevronTexaco by Geomatrix Consultants, �con located along Beechnut Avenue, west f racy <br /> Boulevard. The Workplan was prepared f <br /> According to previous investigation reports conducted at the property, petroleum hydrocarbons have <br /> impacted soil and groundwater onsite. Based on the most recent groundwater investigation report, the <br /> extent of impacted groundwater has not been delineated downgradient to the north (offsite). <br /> The Workplan proposes to advance four soil borings offsite, two within 9th Street and two on a nearby <br /> commercial property, downgradient of the property. The purpose of the borings is to delineate the lateral <br /> extent of impacted groundwater downgradient (north). Depending on the results of the field work, <br /> additional borings, monitoring wells, and soil and groundwater sampling may be required to assess the <br /> lateral extent of impacts to soil and groundwater. <br /> We concur with the proposed Workplan for the 990 Beechnut property, dated 28 May 2004. Please notify <br /> Regional Board staff at least 48 hours prior to start of the field activities. <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 GeologistRG No. 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Gary Foote, Geomatrix, Oakland <br /> California Environmental Protection Agency <br /> Cs Recycled Paper <br />