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Eckert Cold Storage Company <br /> ' 757 Moffat Blvd, Manteca, California November 26, 1997 <br /> Underground Tank Investigation, Continued Please I Report of Findings Page: 3 <br /> bearing zones and the depths at which they were encountered were noted on these logs <br /> (Appendix Q. <br /> Borings into the saturated zone were drilled to a maximum of twenty feet beneath the <br /> ' top of the aquifer being explored. Upon termination, the boring into the saturated zone <br /> was completed as a monitoring well and backfilled with concrete grout, after a <br /> Bentonite seal has been placed. The boring for the monitoring well was of a diameter <br /> iat least four inches greater than the two-inch diameter of the well casing used. <br /> ' The cuttings from the drilling operation were containerized on-site during drilling for <br /> proper disposition. The proper method of disposal will be dependent upon results of <br /> laboratory analysis. This disposal will be the responsibility of the client unless other <br /> ' arrangements have been made. <br /> ' 3.2 Well Construction <br /> All materials used in well construction were thoroughly cleaned prior to introduction <br /> ' into the boring. A Bentonite or cement and Bentonite grout was placed at the bottom <br /> of the boring as necessary. After the seal had been allowed to set long enough to <br /> support the weight of the casing, a two-inch diameter PVC well casing with end cap <br /> ' and factory perforations for placement in the saturated zone (taking into account <br /> seasonal variation) was placed in the boring. The screen and filter pack sizes were as <br /> noted on the well completion log. The casing and end caps were threaded. The filter <br /> ' pack extended one to two feet above the perforated zone. A Bentonite seal 2 to 3-feet <br /> thick was placed in the annular space above the filter pack followed by a cement grout <br /> to the surface. <br /> ' 3.3 Well Development and Sampling <br /> The well were developed until the well water appears clear of sediment, or until an <br /> ' appropriate number of well volumes (based upon the judgment of the responsible <br /> professional) had been evacuated. The water produced during well development was <br /> containerized and left on-site in 55-gallon drums or other suitable containers for <br />' disposal as hazardous waste if deemed necessary upon receipt of laboratory results. <br /> Disposal will be the responsibility of the client unless other arrangements have been <br /> made. The wells were allowed to stabilize for twenty-four hours prior to sampling. <br />' All soil and groundwater samples were properly labeled with date collected, project <br /> ro'ect <br /> number, sample coordinator, and sample identification. Field records document the <br />' above information and other significant data, such as names of on-site personnel, <br />