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V & W DRILLING, INC. , the successor of SOILS EXPLORATION <br /> SERVICES, INC. , was the driller for the borings and well <br /> construction. The Boring Logs were prepared by the Certified <br /> Engineering Geologist, who directed the drilling and recorded the <br /> observations of the geologic units, materials, and stratigraphy <br /> encountered on site during the drilling. Soil Samples were <br /> collected at five foot intervals commencing at approximately 10 <br /> feet below grade. The samples were collected for the geological <br /> description of the subsurface soil conditions. Soil samples were <br /> collected and checked for a reading of 10 or more above <br /> background. The soil samples with a reading of 10 or higher <br /> above background were labelled, placed in a cooler and <br /> transported under Chain of Custody (COC) for chemical analysis. <br /> The Boring and Well Logs, with PID readings and observations made <br /> during drilling, are contained in Appendix A. <br /> Drilled Boring <br /> The first boring, identified as B-1, was bored to approximately <br /> 115 feet at which point a clay layer was encountered. The boring <br /> was terminated at 115 feet below grade. <br /> Well Construction <br /> l <br /> The next boring, identified as MW-4, was drilled to approximately <br /> 62 feet below ground level, groundwater was observed <br /> Approximately 75 feet below grade, the drilling terminated. The <br /> well 's end cap is approximately 74 feet below grade. <br /> The Well Log for Boring-Monitoring Well MW-4 shows 20 feet of <br /> 0 .02 inch screened 2-inch-diameter, Schedule 40 PVC, casing with <br /> a slip on end cap, was placed at the bottom of well MW-4. The <br /> remainder of the well was constructed using regular 2-inch-- <br /> diameter, Schedule 40 PVC casing. Twenty-two feet of #3 Lonestar <br /> Sand was used for the filter pack with a three feet doubly <br /> hydrated Bentonite seal which held water for 15 to 20 minutes <br /> placed above the sand. The remaining portion of the well was <br /> filled with a concrete grout seal and a manhole well cover <br /> installed. A locking cap with lock was placed in the casing to <br /> avoid surface contamination to groundwater. <br /> The Well Log for Boring-Monitoring well MW-5 shows 20 feet of <br /> 0 . 02 inch screened 2-inch-diameter, Schedule 40 PVC, casing with <br /> a slip on end cap, was placed at the bottom of well MW-5 . The <br /> remainder of the well was constructed using regular 2-inch- <br /> diameter, Schedule 40 PVC casing. Twenty-two of #3 Lonestar Sand <br /> was used for the filter pack with a three feet doubly hydrated <br /> Bentonite seal which held water for 15 to 20 minutes placed above <br /> 3 <br />