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t <br /> California Regional Water Quality Control Board <br /> `- Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tamminen Fresno Office Arnold Schwarienegger <br /> Secretaryfor 1695 E Street,Fresno,California 93706 Governor <br /> Environmental Phone(559)445-5116•FAX(559)445-5910 <br /> Protection Intemet Address: http://w .sw b.ca.gov/— gcb5 <br /> GL' I 1 1 2004 <br /> 7 October 2004 E;"�iVIRGi�, HEALTH <br /> PERMIT; ;IWICES <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> Property Management <br /> P.O. Box 6012 <br /> San Ramon, California 94583-0712 <br /> REVIEW OF WORKPLAN, ADDITIONAL SUBSURFACE INVESTIGATION, FORMER <br /> LYOTH LOADING STATION,TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the referenced workplan, dated 22 September 2004, for the ChevronTexaco Old <br /> Valley Pipeline (OVP)project at the former Lyoth Loading Station property, 26501 Banta Road, in <br /> Tracy, San Joaquin County. The workplan was prepared for ChevronTexaco by Science Application <br /> International Corporation(SAIC). In addition, we have reviewed soil and groundwater investigation <br /> reports previously conducted at this site. <br /> The Lyoth property is a former crude oil loading station located on a triangular land parcel adjacent to the <br /> former OVP and the California Northern Railroad Company tracks. Several aboveground storage tanks <br /> were utilized for temporary containment of crude oil and Bunker C locomotive fuel. The crude oil and <br /> Bunker C fuel were transferred from storage to railroad cars from the early 1900's until 1957 when the <br /> tanks and facility were dismantled and removed from the site. Hoffman Brothers Trucking Company <br /> purchased the property several years ago and has operated a trucking operation at the site since that time. <br /> Site investigations have been conducted at the site since 1990 to assess the extent of soil and groundwater <br /> affected by leaks associated with the former OVP and loading station facility. Numerous soil borings <br /> were advanced and seven monitoring wells installed both onsite and offsite (one damaged monitoring <br /> well was abandoned in 2001). Quarterly groundwater monitoring, including product removal from one <br /> well, has been performed at the site from 1997 to 2002 when sampling was changed to semi-annual; <br /> product removal continues quarterly with approximately 5-gallons removed to date. Currently, an <br /> absorbent sock is being utilized for the product removal from the well (MW-2) containing a crude oil <br /> "sheen". Depth to groundwater ranges from approximately 15 to 19 feet and the gradient is generally <br /> north-northeast. <br /> Following review of the 2003 and the April 2004 semi-annual reports, Regional Board determined that <br /> the extent of impacted groundwater had not been delineated downgradient offsite -north of MW-1, <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />