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HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment,Remedial Testing,Design and Operation r t., February 20, 1997 12: 5 7 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, Califorma 93230 Subject Letter Report for Abandonment of Monitoring Wells and Vapor Wells Former Beacon Station No 494 2185 East Fremont Street, Stockton, California Mr Earnest At the request of Ultramar Inc (Ultramar), Horizon Environmental Inc (Horizon) implemented the abandonment of five groundwater-monitoring wells, five vapor wells and rune vapor points at the subject site (see attached Figure 1) This work was performed as part of regulatory closure for the site as approved by the San Joaquin Public Health Services-Environmental Health Division (SJCPHS-EHD) in their letter dated December 13, 1997 Well abandonment permits were filed on January 29, 1997, with the SJCPHS-EHD, and an additional permit with the City of Stockton for approval to enter the public right-of-way where monitoring well MW-4 is located Both were subsequently approved on January 29, 1997 A copy of the permits is included as an attachment to this letter report Monitoring wells MW-1 through MW-4, vapor wells VW-1 through VW-3 and CB-1 were overdrilled and grouted with a "6-sack" bentonite/cement slurry to grade The well boxes were removed prior to the wells being overdrilled The nine vapor probes, VP-1 through VP-9 were destroyed by pressure grouting with a neat cement/bentonite slurry, then the top three feet of the casing was removed by overdrillirg or with a backhoe and the remaining excavation backfilled wtih neat cement Mr Michael Infurna Jr of the SJCPHS-EHD was on-site to witness abandonment activities V&W Drilling Inc of Rio Vista, California performed the abandonments Former locations of all destroyed wells and vapor probes along with othencurrent and former site facilities are shown on Figure 2 In addition, subsurface lateral lines beneath the site that converged at a central manifold on the west side of the property and utilized for the former remediation system were abandoned These subsurface lines were abandoned by pressure-grouting Portland cement into the lines from the manifold, forcing cement through to the well end on the other side, and filling the entire volume with cement 5011 Golden Foothill Parkway,Suite 7 • El Dorado HIlls,CA 95762 • (916)939-2170 • FAX(916)939-2172 PO Box 5283 • Bakersfield,CA 93388 • (805)589-8389 • FAX(805)589-1456