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Regional Office INTERNATIONAL 4585 Pacheco Boulevard TECHNOLOGY Martinez,California 94553-2233 CORPORATION 5I0-372-9100 Fax:510-372-5220 May 15, 1996 IT Project No. 190916.011 Ms. Mary Meays San Joaquin County Environmental Health Department 304 East Weber Street Stockton, CA 95201 Letter Report of Monitoring Well Abandonment Activities Pacific Bell Facility 345 North San Joaquin Street Stockton, California Dear Ms. Meays: IT Corporation (IT) was retained by Pacific Bell to complete the abandonment of three two- inch diameter groundwater monitoring wells and two two-inch diameter vapor monitoring wells, at the above referenced Pacific Bell Facility located in Stockton, California (Figures 1 and 2). The abandonment procedures were completed on May 1, 1996. The following letter work plan discusses the well abandonment procedures as they were executed and completes all required work for final site closure. Field Procedures Prior to commencement of work, a Tailgate Safety Meeting was held to ensure that the proper site safety precautions were observed. This safety meeting was conducted in accordance with the site-specific health and safety plan. Abandonment activities were performed on May 1, 1996 by representatives of Gregg Drilling and Testing, Incorporated (a C-57 licensed driller), under IT supervision. A well abandonment permit was obtained from your office as well as an encroachment permit from the City of Stockton, prior to commencement of field activities. The well box and cover at each of the five wells was hammered out using heavy hand tools. Following well box removal, a tremie pipe was inserted immediately into each boring, with a Portland Cement grout poured in and finished to one foot below grade. As the wells were grouted under pressure, the volume of sealing material emplaced during abandonment was IT Corporah'on is a wholly owned subsidlcry of International Technology Corporation