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I Table 2-1 Well Construction Data Del Monte Plant 33 Stockton, California j Total Well Screened Top of Welt Depth Interval Well Diameter Casing Elevation Well (ft, bgs) (ft, bgs) (inches) (ft, NGVD) MW-DIS-1 88.5 68-88 2 20.68 MW-DIS-2 87.5 67-87 2 19.86 } MW-DIS-3 89.5 69-89 2 20.26 MW-DIS-4 90.5 70-90 2 20.60 MW-DIS-5 90.5 70-90 2 19.75 MW-DIS-6 90.5 70-90 2 20.33 MW-DIS-7S 90.5 70-90 2 20.42 MW-DIS-7D 143.5 --F-133-143 2 20.02 ' bgs--below ground surface NGVD--National Geodetic Vertical Datum ( The shallow wells were drilled and installed by Spectrum with a CME-75 drill rig using 8-inch-outside diameter hollow-stem augers. The deep well was also drilled and installed by Spectrum using mud rotary methods. Continuous soil cores were collected using a 94-millimeter core sampler. t Well Development Development was initiated on each well by surging the screened interval for approximately 30 minutes with a 1.5-inch-diameter steel surge block after the sand filter pack installation. Within 24 hours after completion, each well was further developed by groundwater extraction. Approximately 250 gallons of groundwater were pumped from each well using a 2-inch-diameter Grundfos submersible pump. Each well was pumped at the maximum sustainable rate, typically 5 gallons per minute. The pH, electrical, conductivity, temperature, turbidity, and volume of water extracted were measured and 1 recorded at intervals during development. Development was completed when the turbidity was below approximately 10 NTU, or the bottom of a 5-gallon bucket was readily visible when filled with development water. Each well was surveyed relative to the National Geodetic Vertical Datum (NGVD) by Kjeidsen-Sinnock & Associates (Appendix B). s SF0316041RP1003.51 2-5 fI I