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locations were selected in the field after conferring with the site <br /> foreman and a project engineer from the San Joaquin County Department <br /> of Public Works. The main factors in determining the final locations <br /> of the wells were: (1) concerns regarding protection of the wells, <br /> (2) possible interference with site operations, and (3) regional and <br /> local hydrogeologic information. The wells were placed as close to <br /> existing fence lines as possible, due to planned drainage ditches <br /> around the perimeter of the landfill property. <br /> The borings for Monitoring Wells MW-1, MW-2, MW-3, and MW-4 were <br /> drilled with air-rotary drilling equipment to total depths of 159, <br /> 147, 148, and 144 feet, respectively. Water injection was used to <br /> enhance recovery of material and to aid in drilling the lower sections <br /> of each borehole. Samples were collected at 5-foot depth intervals to <br /> log the materials encountered. Additional samples were occasionally <br /> obtained to aid in the determination of subsurface materials, as <br /> deemed appropriate by the geologist on site. <br /> In accordance with the approved ground-water monitoring plan, borings <br /> were drilled through the uppermost water-bearing zone and terminated <br /> in apparently impermeable clay layers. Materials encountered were <br /> described according to the Unified Soil Classification System by an <br /> EMCON geologist under the direct supervision of a registered geologist <br /> (pursuant to the requirements of Subchapter 15) . Boring logs and well <br /> construction details are included in Appendix B. <br /> Monitoring Well Gonstr' tine <br /> The four borings were converted to monitoring wells at somewhat shal- <br /> lower depths, as listed on Table 1. The borings were completed as <br /> monitoring wells with the installation of 4-1/2-inch, polyvinyl chlo- <br /> ride casing, with 50-foot screen intervals, as documented on the well <br /> details, which accompany the attached exploratory boring logs (see <br /> Appendix B) . Fifty-foot screens were installed in the four wells <br /> because the depth to the static water level was approximately the same <br /> PJ9 9390102.00D 3 <br /> Emcon Associotes <br />