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Eckert Cold Company <br /> Storage g P Y <br /> 757 Moffat Blvd, Manteca, California May 5, 199S <br /> Underground Tank Investigation, Phase I Report of Findings Page: 3 <br /> laboratory analys.s 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 pnor 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 /> 1 and factory perforations for placement in the saturated zone (talang 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 /> 1 <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 /> containenzed 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 /> 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 /> sampling methods, date and time of sampling, the number of well volumes removed <br /> before sampling, preservatives added (if any), and any filtration performed on samples <br /> ' The samples were immediately refrigerated for delivery Yto the laboratory and were <br /> ' under no circumstances opened by anyone other than laboratory personnel Chain of <br /> Custody records were maintained at all times(Appendix B) <br /> ' 3.4 Soil Sampling <br /> All soil sampling egwpment was thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination Relatively undisturbed soil samples were <br />