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7 <br />3.02 EXISTING SITE CONDITIONS <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 />F. The Contractor shall provide soil samples as determined by the Engineer for <br />each drilling method. The Engineer will log the drilling at every 5 -foot intervals <br />based on the characterization of these samples. <br />G. If the borehole was over-drilled, the bottom of the hole shall be filled with sand to <br />raise the bottom of the hole. <br />San Joaquin County <br />Groundwater Monitoring Well Specifications 5 Public Works Dept <br />Solid Waste Division <br />A. <br />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. <br />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 <br />DRILLING <br />A. <br />Drilling does not require EHD inspection. <br />B. <br />The Contractor shall drill at the location staked by the Engineer. Contractor shall <br />verify drilling location with the Engineer before drilling. <br />C. <br />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 <br />the the drill down time. <br />shall clean equipment at site without charging rig <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 />F. The Contractor shall provide soil samples as determined by the Engineer for <br />each drilling method. The Engineer will log the drilling at every 5 -foot intervals <br />based on the characterization of these samples. <br />G. If the borehole was over-drilled, the bottom of the hole shall be filled with sand to <br />raise the bottom of the hole. <br />San Joaquin County <br />Groundwater Monitoring Well Specifications 5 Public Works Dept <br />Solid Waste Division <br />