Laserfiche WebLink
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 />H. Uncompleted Borings <br />1. If there is an interruption in work, such as overnight shutdown or inclement <br />weather, the Contractor shall: <br />a Measure and record depth of uncompleted borings left overnight. <br />b Cover the well opening a watertight uncontaminated cover with the <br />following methods: <br />Leave the hollow stem auger in the boring and place the drills drive shaft <br />over it. <br />Cover the boring with a 3/ -inch thick 4x8 plywood or a steel plate 2ft x 2ft <br />in size. Contractor shall place bentonite around plywood or steel covers if <br />used. The plywood or steel cover shall be secured in place or weighted <br />down so that it cannot be tampered or blown away by the wind. <br />c Direct all surface runoff away from the boring. <br />d Cordon -off the work area with safety cones and caution tape to the <br />satisfaction of the Engineer. <br />2. Contractor shall verify the depth of the well the next day by measuring with the <br />weighted tape. If the boring has collapsed, then the Contractor shall re -drill the <br />boring at no additional cost to the County. <br />1. If an obstruction or other condition is encountered that prevents the drilling of a <br />well at the location identified, the Engineer may request that the Contractor <br />abandon the boring. If directed so, the Contractor shall fill the hole with neat <br />cement. Neat cement backfill shall be in the presence of EHD inspector. <br />3.01 WELL INSTALLATION <br />A. Well installation shall be in the presence of EHD inspectors. Contractor shall <br />follow the guidelines for well inspection as specified herein. <br />NC -Groundwater Monitoring <br />Well Specifications 12/08/17 Page 5 of 13 San Joaquin County Public Works Dept <br />Solid Waste Division <br />