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The actual well depth will be determined in the field by the Engineer based on the <br /> first encountered groundwater level. Contractor shall leave well bores open for a <br /> minimum of 12 hours to allow water level to stabilize before installing the well. <br /> 3.02 EXISTING SITE CONDITIONS <br /> A. Contractor shall examine the areas and conditions under which work of this <br /> section will be performed. Contractor shall notify the Engineers if site conditions <br /> are not in accordance with the scope of work or the well specifications. <br /> B. The Contractor shall protect any existing survey monuments, groundwater wells, <br /> bollards and other monitoring wells in or near the work area. Any existing items <br /> damaged by the Contractor shall be repaired or replaced by the Contractor to its <br /> original or better condition. <br /> 3.03 DRILLING <br /> A. Drilling does not require EHD inspection. <br /> B. The Contractor shall drill at the location staked by the Engineer. Contractor shall <br /> verify drilling location with the Engineer before drilling. <br /> C. The Contractor shall decontaminate the drilling rig and drilling equipment before <br /> drilling. <br /> 1. Decontamination <br /> a. Decontamination shall be in accordance with ASTM D 5088 and ASTM <br /> D 5608. The drill rods, drill bits, augers, temporary casing, well <br /> development equipment, tremie pipes, grout pumping lines, and other <br /> associated equipment shall be cleaned with high-pressure hot <br /> water/steam prior to drilling. Weighted measuring tapes used in <br /> previous projects or between borehole locations shall also be <br /> decontaminated. <br /> b. Decontamination shall be performed either at a central decontamination <br /> station or an area that is remote from, and cross- or down-gradient from, <br /> the well being drilled. <br /> 2. If drilling equipment is found unclean by the Engineer, then the Contractor shall <br /> clean the equipment at the site without charging drill rig down time. <br /> D. Contractor shall clear the boring location of all brush and minor obstructions. <br /> E. Drilling shall be in the presence of the Engineer. <br /> North County G-15&G-16 San Joaquin County <br /> Groundwater Monitoring Well Specifications 5 Public Works Dept <br /> Solid Waste Division <br />