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i i Anheuser-Busch, Stockton, California February 12; 1992 I San Joaquin County Public Health Services 2 .Soil cuttings will be placed in 55-gallon drums, labeled and stored on-site, end'in laborato :anal ses to I _ _ determine a proper disposal method Copies of_the laboratory-analytical results and chain-of-custody records will be submitted to San Joaquin County Public Health Services, Environmental Health'Division. If groundwater is encountered within 30 feet of the surface, three groundwater monitoring wells will be ! installed in the soil borings. The wells will be completed with 2-inch diameter, 0.010-inch slotted, PVC screen from completion depth to 5 feet above water levels. The wells will be finished to the surface with 2-inch-diameter PVC casing. The annular space between the borehole and casing will be backfilled with I No. 2/12 Lapis Lustre sand from the well completion depth to approximately-1 foot above fhb-top of the well screen. A sanitary seal., consisting of.1'/2 to 2 feet of bentonite followed by cement grout, will be installed to the surface. The wells will be finished with a water-tight locking cap inside a traffic-rated street box. Attachment C is a diagram showing typical well construction details. The monitoring wells will be deve. loped during well installation to improve hydraulic communication with the surrounding aquifer. Before the sanitary seal is installed, suspended sediment will be removed from the wells using a surge and bail technique until the extracted groundwater is free of fine sediments. All development water will'be placed in 55-gallon drums, labeled, and stored on site pending laboratory analyses to determine a proper disposal method. The depth to groundwater will be measured in the three monitoring wells using an INTERFACE PROBE'" Well Monitoring System. (The wellhead elevations will be surveyed relative to an arbitrary datum. Groundwater levels and wellhead elevations will be used to determine the local groundwater gradient and flow direction. Before sampling, the wells will be purged of approximately four well volumes or until the purge water temperature, conductivity, and pH stabilizes. The.wells will be allowed to recharge to a least 80 percent of their initial water level before sampling. Groundwater samples will be collected using a TeflonO bailer, placed in 40-milliliter glass vials, and sealed with Teflon° caps. The sample vials will be labeled and placed in an ice-chilled, insulated cooler for transport to a California-certified laboratory, accompanied by a chain-of-custody record. The samples will be analyzed for Appendix IX (40 CFR 264) constituents. Copies of the laboratory analytical results and chain-of-custody records will be submitted ` to San Joaquin in CountYPublic Health Services, Environmental Health Division. I i I I D GROUNDWATER ❑ TECHNOLOGY,INC. i