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PART 3 EXECUTION <br />3.01 GENERAL <br />The actual well depth will be determined in the field by the Engineer based on the <br />groundwater level. Contractor shall leave well bores open for a minimum of 8 <br />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 developing <br />equipment, tremie pipes, grout pumping lines, and other associated <br />equipment shall be cleaned with high-pressure hot water/steam prior to <br />drilling. Weighted measuring tapes used in previous projects 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, the <br />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 />NC -Groundwater Monitoring <br />Well Specifications 12/08/17 Page 4 of 13 San Joaquin County Public Works Dept <br />Solid Waste Division <br />