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. 1 California Regional Water Quality Control Board Central Valley Region 01M� Robert Schneider,Chair Alan C.Lloyd,Ph.D. Arnold Secretaryjor Fresno Branch Office Schwarzenegger Environmental 1685 E Street,Fresno,California 93706 Governor Protection (559)445-5116•Fax(559)445-5910 http://w .waterboards.ca.gov/centmlvalley 30 March 2006 [RECDWDD MAR 3 1 2006 ENVIRONMENT HEALTH M. Scott Mansholt PERMIT/SERVICES Chevron Environmental Management Company 6001 Bollinger Canyon Road Rm K2066 San Ramon, California 94583-2324 REVIEW—ADDENDUM TO MONITORING WELL DESTRUCTION WORKPLAN,ALDEN PARK, TRACY, SAN JOA QUINCOUNTY Central Valley Regional Water Quality Control Board staff has reviewed the referenced document for destruction of an out of service unnamed vacuum remedial well located adjacent to a building previously used to contain bio-venting equipment. The report, dated 21 March 2006, was submitted by Science Applications International Corporation (SAIC) on behalf of Chevron. According to SAIC staff,use of the vacuum well and associated building(installed in late 1987 or early 1988) was last utilized in latter 1994 or early 1995 and has not been used since that time. The vacuum well and four monitoring wells (MW-1/KJC, MW-2, MW-13 and MW-17) located at Chevron's Alden Park project site will be destroyed in accordance with the workplan for this task approved by Regional Board staff on 31 January 2006. It is our understanding that a well destruction permit from the San Joaquin County Environmental Health(SJCEHD) is required. We have the following comments to the addendum report: • The historical documents indicate there is a 3-inch PVC vent pipe between the vacuum well and the bio-vent building. The proposal did not indicate if the 3-inch PVC vent line approximately 15-feet in length and the well vault will be removed during the well destruction and building demolition. hi order to eliminate uncertainties in the event future excavations occurs in this area, the PVC line and well vault should be removed. • During our review of the addendum report, SJCEHD staff contacted this office and stated one of their conditions for approval of Chevron's Alden Park well destruction permit was that any equipment, piping, utility lines, etc. that are associated with the vacuum well must be removed. We concur with the amended workplan to destroy the vacuum well provided our comments outlined above are addressed and the destruction process is consistent with the SJCEHD requirements. California Environmental Protection Agency 0 Recycled Paper