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was decontaminated with steam cleaning prior to use. A summary of the well construc- <br /> tion is presented in Table A-1. <br /> TAIL- A-1 <br /> Monitoring Wells MW-4, MW-5, MW-6 and MW-7 <br /> Construction Details <br /> Well Name: MW-1, h1W-2,MW-3 Date Built: 2/27/91, 2/28/91 <br /> Location: 350 W. Grantline,Tracy Hole Diameter. 10 inches <br /> 1 Client. Souza Realty Well Diameter. 4 inches <br /> Project No.: 6254-01-02 Casing Type: sch. 40 PVC <br /> Contractor. Melton Drilling Corp. Screen Type: sch. 40 PVC <br /> Driller. Randy Walton Screen Slot: 0.02 inch <br /> Helper. Daryl Padget Completion: Flush mounted <br /> Christy Box, locked <br /> , y <br /> Equipment Top/Bottom End Caps locking/screw on <br /> Drill Rig: B-53 <br /> Method: Hollow Stem Geologist'. J. F. Herrick <br /> M. Morton <br /> Decon: Steam <br /> Sampling: N/A <br /> Decon: Alconox,water <br /> Well Name Drill Depth Well Depth Screen Sand Pack in- Seal Interval <br /> (feet BGS) (feet BGS) Interval terval (feet SGS) <br /> (feet BGS) (feet BGS) <br /> MW-1 20 19.0 3.5-18.5 2.5-20.0 1.5-2.5 <br /> 11 <br /> r MW-2 20 19.5 4.0-19.0 3.0-20.0 2.0-3.0 <br /> MW-3 20 19.5 4.0-19.0 3.0-20.0 2.0-3.0 <br /> Each of the three wells was developed by using a submersible pump to evacuate water <br /> from the well. The wells were pumped continuously to liberate as much fine material from <br /> the borehole walls as possible. Wells MWA and MW-2 each had a total of 110 gallons <br /> pumped, while MW-3 had 105 gallons removed. In each well approximately ten to eleven <br /> standng well volumes were removed. At the end of the development process, the water <br /> derived from all wells was only slightly cloudy and relatively free from suspended <br /> sediment. All purge water was containerized, labeled, and left at the site pending <br /> A - 2 <br /> d <br />