ARCHIVED REPORTS_2011_27 - Laserfiche WebLink

Home Browse Search

Mr. Robert McClellon May 28, 2009 Page 3 • WORK PLAN FOR PROBE INSTALLATION Installation Criteria Two probes, to be designated GP -26 and GP -27, will be installed in native soils at the approximate location shown in Figure 2. Probe construction will be consistent with the requirements of Title 27 §20925(d). Table 2 provides predicted well construction details, subject to change depending on actual conditions encountered. The monitoring probes will be drilled and installed using hollow -stem auger equipment and methods. A certified State of California (C-57) licensed drilling contractor will be contracted to conduct the drilling and well construction activities. Key considerations for probe installation are as follows: ■ New Probe Location — The proposed probe GP -26 will be installed on landfill property between probes GP -1 and GP -25; and the proposed probe, GP -27, will be installed on landfill property between probes GP -16 and GP -17. The proposed location is shown on Figure 2. The proposed probes will be located approximately at the midpoint between . the existing probes, but the exact location is subject to change based on conditions encountered in the field. ■ Probe Depth — Existing waste at the landfill is estimated to be at an elevation of 25 feet above mean seal level (msl) at the lowest point. The probe will be drilled below this depth or to the approximate permanent seasonal low water table, whichever is higher, as determined in the field during well installation. Pre -Construction Activities All required well drilling/well installation permits will be obtained prior to the start of well drilling activities. The drilling location will be marked in white paint and Underground Service Alert (USA) will be notified as required by law a minimum of 48 hours prior to any drilling activities. Drilling A split spoon soil core sample will be taken at five foot interval for soil logging. Subsurface geology will be logged during drilling by a qualified professional using the Unified Soil Classification System (USCS). The total depths of the new probes are expected to be approximately 26 feet and 36 feet, respectively, as indicated in Table 2. The actual depth will be