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STATE OF CALIFORNIA-Environmental Protecbk%, 4ency PETE WILSON Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARDS :;i_;_" <br /> CENTRAL VALLEY REGION Tit <br /> 3443 Routier Road,Suite A ! - -- <br /> Sacramento,CA 95827-3098O; �1 <br /> PHONE:(916)255-3000 J' uL r ; � <br /> FAX:(916)255-3015 <br /> 1 October 1996 <br /> ,Mr. Young Chong <br /> US Army Corps of Engineers <br /> Sacramento District <br /> 1325 J Street <br /> Sacramento, CA 95814-2922 <br /> REVIEW COMMENTS ON THE SITE CLOSURE REPORT FOR THE UNDERGROUND STORAGE <br /> TANK REMOVAL AT THE TRA.C'YAUXILIARY FIELD NO. S, TRACY, SAN JOA QUIN COUNTY <br /> We have reviewed the Site Closure Plan, dated 4 December I995, for the work at the Tracy Auxiliary Field No. <br /> 5 site near Tracy, in San Joaquin County. The Closure Plan, which was prepared by CKY Inc. on behalf of the <br /> US Army Corps of Engineers (USACE), was forwarded to our office by the USACE on 22 January 1996. In <br /> general, the Closure Plan adequately describes the procedures used during the removal of one 10,000 gallon <br /> underground fuel storage tank. <br /> The San Joaquin County Public Health Services Department was the lead regulatory agency for the actual tank <br /> removal. Since this is a formerly used defense facility, the Regional Water Quality Control Board, Central Valley <br /> Region would have been the lead regulatory agency on the site for water quality concerns, including underground <br /> storage tanks, if evidence collected during the tank removal indicated there was a threat to water quality, or any <br /> soil contamination extended beyond the depth of overexcavation. Since no contamination was detected in the <br /> confirmation samples collected from the excavation, there does not appear to be threat to water quality from this <br /> tank removal. As such, we defer site closure oversight for this particular underground storage tank closure to <br /> the San Joaquin County Public Health Services Department. Once we have received San Joaquin County's <br /> response to the closure plan, we will provide the USACE with a final concurrence letter for the actions <br /> performed during this last phase of work. <br /> According to the Inventory project Report (NPR) for this site, dated J anuaq 1990, there is also an 3,000 gallon <br /> underground fuel storage tank at the site that may have been used by the Department of Defense. The USACE <br /> should determine if this 8,000 gallon underground storage tank was used by the Department of Defense. If it <br /> was, and it is still in place and not being used, it should be properly removed. If you have any questions or <br /> comments, please call me at (916) 255-3066. <br /> JOHN RUSSELL <br /> Associate Engineering Geologist <br /> cc: Robert McCiellon, San Joaquin County Environmental Health Division, Stockton <br /> Eric Hong, Department of Toxic Substances Control, Sacramento <br /> l <br />