Laserfiche WebLink
STATE OF CALIFORNIA - Emironmental Proton Agency <br /> PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION ` °� <br /> Sacramento, <br /> Rento, Road, Suite A � <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 255-3000 <br /> FAX: (916) 255-3015 IBJ/ <br /> a� <br /> Mr. Don O. Culbertson SEP u G 1994 1 September 1994 <br /> Chevron Pipe Line Company <br /> 5080 California Avenue, Suite 400 ENVIRONMENTAL HEALTH <br /> Bakersfield, CA 93309-1671 PERMIT/SERVICES <br /> INTERIM SITE ASSESSMENT REPORT, FORMER LYOTH LOADING STATION, <br /> CHEVRON PIPE LINE COMPANY, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the July 1994 Interim Site Assessment Repo.. prepared by your consultant, EMCON <br /> Associates, for Chevron's former Lyoth Loading Station. The report shows that both soil and <br /> ground water are contaminated with petroleum hydrocarbons. <br /> EMCON proposes drilling three new monitoring wells in accordance with the December 1993 work <br /> plan. Based upon your maps and the investigations completed to date, you expect total petroleum <br /> hydrocarbon concentrations in ground water from all three monitoring wells to be non-detectable <br /> (ND). Monitoring well MW-5 appears to be a few hundred feet downgradient from the source of <br /> contamination and probably will be ND. If the proposed MW-5 location is ND, this will establish a <br /> zero-line of contamination and any remediation plan will need to include the area out to MW-5. <br /> Therefore, you may want to consider moving MW-5 to a location just northeast of the railroad <br /> tracks across from B-16 (see attached map). A fourth monitoring well needs to be placed northeast <br /> of the railroad tracks across from B-8 and B-10 to monitor for migration downgradient of those <br /> areas of contamination (see attached map). By 27 September 1994, please respond to these <br /> comments and provide a schedule to install and sample the wells and to submit a report of findings. <br /> Based on the investigations completed to date and recent inspections, there are several other areas at <br /> the site which need to be investigated for soil and ground water contamination. These include the <br /> area around the former 35,000-gallon storage tank on the west side of the site, the area around the <br /> former 55,000-gallon storage tank, the area along the old piping between the tanks, and the old <br /> reported sludge pit area west of the former 55,000-gallon tank. Additional soil investigation also is <br /> needed southeast of B-9 to define the limits of the contamination. By 12 October 1994, please <br /> submit a work plan to complete the site characterization. <br /> If you have any questions, you may contact me at (916) 255-3054. <br /> DAVID E. JENKINS <br /> Associate Engineering Geologist <br /> DEJ:lsb <br /> cc: ✓Ms. Margaret Lagorio, San Joaquin County Public Health Services, Stockton <br /> Mr. Richard Larrouy, San Joaquin County Community Development Department, Stockton <br /> Mr. Bill Vizza, Director, Department of Public Works, Tracy <br /> Mr. Ronald E. Hoffman, Tracy <br />