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Boyett Petroleum June 29, 2401 <br /> 419 South Main Street,Manteca, California Page 5 <br /> ' Final Report of Findings for Lateral <br /> Extent of Groundwater Contamination <br /> 3.2 Well Construction <br /> All materials used in well construction were thoroughly cleaned prior to <br />' introduction into the boring. A Bentonite, or cement and Bentonite grout, was <br /> placed at the bottom of the boring, as necessary. After the seal was allowed to set <br />' long enough to support the weight of the casing, a two inch (2") diameter well <br /> casing (PVC) with end cap and factory perforations for placement in the saturated <br /> zone (taking into account seasonal variation) was placed in the boring. <br />' The screen and filter pack sizes are noted in the well construction drawings <br /> (Appendix A). The casing and end caps were threaded; no PVC cement was used. <br />' The filter pack extends two (2') above the perforated zone. A Bentonite seal at <br /> least three feet (3') thick was placed in the annular space above the filter pack <br /> followed by a cement grout to the surface. <br /> 3.3 Well Development and Sampling <br /> The well was developed until the well water appeared clear of sediment or until an <br /> l� pp , <br /> appropriate number of well volumes (based on the judgment of the responsible <br />' professional) had been evacuated. The water produced during well development <br /> was containerized and left on-site in 55-gallon drums for disposal as hazardous <br />' waste, if deemed necessary, upon receipt of laboratory results. Disposal will be the <br /> responsibility of the client unless other arrangements have been made. The well <br /> was allowed to stabilize for twenty-four hours prior to sampling. <br />' The groundwater sample was properly labeled with date collected, project number, <br /> sample coordinator, and sample identification. Field records document the above <br /> 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 <br /> removed before sampling, preservatives added (if any), and any filtration <br /> performed on samples. <br /> The sample was refrigerated immediately for delivery to the laboratory and under <br />' no circumstances opened by anyone other than laboratory personnel. Chain of <br /> Custody records were maintained at all times. <br /> 3.4 Soil Sampling <br /> All soil sampling equipment was thoroughly cleaned before and between sampling <br /> to prevent cross contamination. Relatively undisturbed soil samples were taken at <br />