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described in accordance with the Unified Soil Classification System (see Boring Logs, <br /> Appendix A) <br /> 33 Well Completion <br /> Borings MW-2 and MW-3 were completed as groundwater monitoring wells using a 2-inch <br /> diameter PVC casing with 0 020-inch slotted screen from 10 to 30 feet The filter pack (#3 <br /> lonestar sand) was installed from 8 to 30 feet Approximately 15 feet of bentonite pellets <br /> sealed the wells and each well was grouted to the surface with Portland cement <br /> 3.4 Monitoring Well Sampling <br /> On January 30, 1995, the groundwater depths in all wells were measured relative to the top <br /> of the casing using a Solinst water level meter The relative piezometric levels and hydraulic <br /> gradient were determined from these data (Table 1) <br /> After groundwater depths were measured, a two-stage submersible pump was used to purge <br /> standing water from each well MW-2 and MW-3 were developed by removing <br /> approximately 20 gallons of water from each well Approximately 4 gallons of water was <br /> removed from MW-1. Temperature, pH and conductivity were measured at one-gallon <br /> intervals using an ICM water analyzer (Appendix B) Purge water was placed in 55-gallon <br /> DOT drums and stored on-site. <br /> After stabilization, water samples were collected from each well using a new, disposable <br /> plastic bailer Samples were collected in 40-m1 EPA vials and 1-1, amber bottles, placed in <br /> a chilled container, and transported under chain-of-custody procedure to MAI for analysis <br /> TABLE 1 <br /> RELATIVE GROUNDWATER ELEVATIONS <br /> Cal-West Concrete Cutting <br /> 1153 Vanderbilt Circle, Manteca, California <br /> Depth to Relative <br /> Relative Groundwater Groundwater <br /> Well No Casing Elevation Elevation <br /> 1/30/95 1/30/95 <br /> MW-1 5108 1904 3114 <br /> MW-2 5052 1933 3119 <br /> MW-3 5122 2024 3098 <br /> easurements to leet <br /> p.e Smt A&&S.�Im C <br /> GtiFWW P16W1055!}..1495 5 <br />