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California regional Water Quality Control Board <br /> Central Valley Region <br /> Linda A.Adams Arnold <br /> Secretaryfor Robert Schneider,Chair Schwarzenegger <br /> Environmental Governor <br /> Protection Fresno Branch Office <br /> 1685 E Street,Fresno,California 93706 <br /> (559)445-5116• Fax(559)445-5910 <br /> v I <br /> h[tp://www.wa[erboards.ca.gov/central al ey <br /> 15 August 2006 ULLJ <br /> M. Scott Mansholt AUG 16 2006 <br /> Chevron Environmental Management Company ENVIROM IEN f IiEALTH <br /> 6001 Bollinger Canyon Road PERMIT/SERVICES <br /> Rm K2066 <br /> San Ramon, California 94583-2324 5p(:) C"uat A <br /> REVIEW— OIL SEEP VAULT ABANDONMENT WORKPLAN, ALDEN PARK, TRACY, SAN <br /> JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the referenced document describing destruction of <br /> four former oil seep vaults at Alden Park. The report, dated 9 August 2006, was submitted by <br /> Science Applications International Corporation (SAIC) on behalf of Chevron. <br /> The four corrugated steel vaults, approximately two feet in diameter and four feet deep, are <br /> located along the perimeter and east section of Alden Park. Previously, the vaults were <br /> installed in the latter 1980's as an effort to recover crude oil present in shallow soils. The <br /> process was unsuccessful and eventually terminated in 1994; the vaults have not been used <br /> since that time. <br /> According to the workplan, after obtaining appropriate City of Tracy permits, the vaults and <br /> surrounding materials will be removed using a backhoe. The materials removed will be <br /> properly disposed at a permitted landfill. Each excavation will be backfilled with a bentonite <br /> slurry and/or high-density soil to minimize water infiltration. <br /> Regional Water Board staff concurs with the workplan to remove the oil seep vaults. Please <br /> provide a brief summary report after the work has been completed. <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 Geologist <br /> PG No. 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Luis Mercado, SAIC, Sacramento <br /> California Environmental Protection Agency <br /> �t1'Recycled Paper <br />