Laserfiche WebLink
during the drilling of SG-3A. A 10-inch diameter borehole was drilled to 76 feet bgs <br /> and a 8-inch diameter borehole was drilled from 76 feet bgs to 261 feet bgs. Continuous <br /> core samples were collected from 36 feet bgs (just below the depth of SG-3) to 261 feet <br /> bgs. Three casings were installed. Each casing includes a 20-foot screen. The screens <br /> were placed at 50 to 70 feet bgs, 140 to 160 feet bgs, and 215 to 235 feet bgs (see <br /> Appendix B). The well monument was installed the week of May 23, 2016. <br /> The planned total depth of the deep casing was 260 feet bgs; however, groundwater was <br /> detected at approximately 250 feet bgs. The bottom of the deep casing was set at 235 feet <br /> bgs to keep the bottom of the screen 15 feet above the static groundwater level. <br /> Drilling and Installation —SG-6A <br /> Drilling and installation of SG-6A occurred from May 11, 2016 through May 13, 2016. <br /> SG-6A replaced SG-6. The well monument, casing, and annular fill from SG-6 were <br /> removed during the drilling of SG-6A. A 10-inch diameter borehole was drilled to 76 <br /> feet bgs and a 8-inch diameter borehole was drilled from 76 feet bgs to 198 feet bgs. <br /> Continuous core samples were collected from 46 feet bgs (just below the depth of SG-6) <br /> to 196 feet bgs. Three casings were installed. Each casing includes a 20-foot screen. <br /> The screens were placed at 1.0 to 30 feet bgs, 75 to 95 feet bgs, and 175 to 195 feet bgs <br /> (see Appendix B). The well monument was installed the week of May 23, 2016. <br /> The planned screened interval of the shallow casing was 15 to 35 feet bgs; however, the <br /> boring log for SG-6 showed that there is too much silt and clay in the original planned <br /> screened interval for the soil gas monitoring well to be effective. The screened interval <br /> of the shallow casing was moved to 10 to 30 feet bgs to allow a greater portion of the <br /> screen to be set in sand. <br /> Drilling and Installation —SG-10A <br /> Drilling and installation of SG-10A occurred from May 17, 2016 through May 19, 2016. <br /> A 10-inch diameter borehole was drilled to 76 feet bgs and a 8-inch diameter borehole <br /> drilled from 76 feet bgs to 262 feet bgs. Continuous core samples were collected from <br /> the ground surface to 261 feet bgs. Three casings were installed. Each casing includes a <br /> 20-foot screen. The screens were placed at 50 to 70 feet bgs, 140 to 160 feet bgs, and <br /> 240 to 260 feet bgs (see Appendix B). The well monument was installed the week of <br /> May 23, 2016. <br /> Drilling and Installation —SG-11A <br /> Drilling and installation of SG-11A occurred from April 19, 2016 through April 22,2016. <br /> SG-11A replaced SG-11. The well monument, casing, and annular fill from SG-11 were <br /> removed during the drilling of SG-11A. A 10-inch diameter borehole was drilled to 71 <br /> feet bgs and a 8-inch diameter borehole drilled from 71 feet bgs to 261 feet bgs. <br /> Continuous core samples were collected from 37 feet bgs (just below the completed depth <br /> of SG-11) to 261 feet bgs. Three casings were installed. Each casing includes a 20-foot <br /> screen. The screens were placed at 50 to 70 feet bgs, 140 to 160 feet bgs, and 240 to 260 <br /> feet bgs (see Appendix B). The well monument was installed the week of May 23, 2016. <br /> 3 <br />