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KLEINFELDER <br /> through the inside of the protective drill casing. Standard steel centralizers were used <br /> approximately every 50 feet to help center the casing in the boring. In each well, Monterey <br /> Sand No. 2/12 was used as the filter pack material. The sand was placed in the annulus <br /> between the well casing and the protective casing. The protective casing was removed <br /> gradually during the installation of the annular material. The filter pack was brought to a <br /> level seven feet above the top of the screen to allow for compaction of the filter pack under <br /> the weight of the remaining annular seal. Monitoring well construction details are <br /> presented in Table 3-2. <br /> After installing the sand pack, each well was bailed for a period of 15 to 20 minutes. This <br /> allowed for settling of the filter pack. The filter pack dropped 11 inches in MW-2. <br /> Additional sand was added to bring the top of the filter pack to 7 feet above the top of the <br /> screen. The filter pack did not drop after bailing in -1. <br /> Each well is protected by a 4-foot steel locking security cover with a stainless steel well <br /> identification tag. The security covers are secured in place with cement. A representative <br /> of the San Joaquin Local Health District was present during the grouting of both wells. <br /> 3.3.4 Water Level Measurements <br /> The tops of the monitoring wells were, surveyed by R.W. Siegfried and Associates. <br /> Horizontal coordinates of the wells are on the same horizontal datum used in the 1987 <br /> landfill mapping project, conducted by The San Joaquin County Public Works. The <br /> vertical coordinates are referenced to the USGS mean sea level elevation used by the San <br /> Joaquin County Department of Public Works. <br /> Water level measurements were taken July 1989, October 1989, February 1990 and April <br /> 1990 following the protocol discussed in Appendix A. <br /> 3.3.5 Ground Water Sampling <br /> Ground water samples were collected quarterly, following the protocol discussed in <br /> Appendix A. In July 1989, samples were submitted to the laboratory for analysis of <br /> constituents and parameters listed in the SWAT proposal. Subsequent samples were <br /> submitted for analysis of constituents and parameters- listed under "Ground Water <br /> FOOTHILL 20 <br />