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' pack extended from the bottom of the screened interval to <br /> approximately 2 feet above the top of the well screen. A layer of <br /> bentonite pellets was placed above the sand pack, and the remainder <br /> of the boring was backfilled with grout The grout consisted of Type I- <br /> II cement and was well mixed with bentonite powder and sufficient <br /> water to create a fluid The well was secured with a locking cap and <br />' was covered with a utility box which was set flush with the ground <br /> surface. <br />' Selection of screengd Interva Confined ground water conditions <br /> were encountered in MW-5A. Ground water was initially <br /> encountered at approximately 8 feet bgs in MW-5A The ground <br />' water level rose to an approximate depth of 6 feet bgs. A 10-foot <br /> screened interval was placed between 8 and 18 feet bgs. <br /> Manitor• MW-5A was developed <br /> 1 on May3, 1993 by surging and bailing. Some difficulty was <br /> encountered when silty material plugged the well screen, resulting <br /> in slow recharge The well development was eventually successfully <br />' completed. The well development records are included in <br /> Appendix P <br />' On April 28, 1993, well MW-5A was surveyed for elevation and <br /> location (Appendix P). The elevation of the top of the well casing was <br /> measured with respect to the same benchmark that had been used <br /> during the Phase I investigation An arbitrary base elevation of <br /> 100 feet was utilized, as with previous investigations. <br /> MgWtoringr' Purging was accomplished <br /> by removing a minimum of three well volumes of werrWater <br /> le <br /> vels <br /> were measured before and after purging. purged w was <br />' monitored for conductivity, temperature, pH, and turbidity. <br /> All purge water and rinsate was stored in sealed 55-gallon drums <br /> analyses. Each <br /> pending the results of' dicate its contentss alaboratond boring number. The rum was clearly <br /> labelled to Indic The drums were <br /> stored on pallets located on the loading dock <br /> ' All wells were sampled on April 30 and May 3, 1993 using a <br /> precleaned Teflon® bailer. Water samples were placed in containers <br /> provided by the laboratory Water samples were labelled with a <br /> ' unique sample number, the project name and location, the date and <br /> time, and the sampler's initials Samples were then placed in Zip- <br /> Lock® type plastic bags, sealed, and placed in an iced cooler. <br /> ' Information noted on the label was recorded on a chain-of-custody <br /> form. The samples were delivered under chain-of-custody to <br /> Anametrix, Inc., a California-certified laboratory <br /> 5-11 <br />