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2.0 FIELD PROCEDURES ' Procedures to be used during abandonment of wells MW-1 and MW-12 are described in the following subsections. All work will be performed by a C-57 licensed contractor under the direction of a California Registered Professional Engineer, Geologist or Engineering Geologist. ' Work will conform to Well Standards promulgated by San Joaquin County Public Health Services, Environmental Health Division. ' 2.1 Description of Existing Wells ' Monitoring well MW-1 is approximately 25 feet deep and is constructed of 2-inch Schedule 40 PVC blank casing to a depth of approximately 5 feet below ground surface (bgs). Twenty feet of 0.020-inch opening Schedule 40 PVC well screen was installed from 5 to 25 feet bgs. A filter pack consisting of silica sand was installed to about 2 feet above the top of the well screen,with a 2-foot thick bentonite seal above the filter pack. A concrete grout seal extends from the top of ' the bentonite seal (3 feet bgs)to the flush-mounted ground surface completion. ' Monitoring well MW-12 is approximately 18 feet deep and is constructed of 2-inch Schedule 40 PVC blank casing to a depth of approximately 8 feet below ground surface (bgs). Ten feet of 0.020-inch opening Schedule 40 PVC well screen was installed from 8 to 18 feet bgs. A filter pack consisting of silica sand was installed to about 2 feet above the top of the well screen, with a 2-foot thick bentonite seal above the filter pack. A concrete grout seal extends from the top of the bentonite seal (3 feet bgs)to the flush-mounted ground surface completion. t Descriptions of wells MW-1 and MW-12 can be found in Groundwater Assessment Report, Leprino Foods, Tracy, California(Kleinfelder,April 13, 1994) and Supplemental Groundwater Assessment Leprino Foods Facility, 2401 MacArthur Drive, Tracy, California (Kleinfelder, November 30, 1994), respectively. ' (CAPROJECfS\S LEPRINO\MW Abandonment\Work Plan Rev 4.wpd) 3 HSI GEOTRANS