Laserfiche WebLink
7 <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 />c Leave the hollow stem auger in the boring and place the drills drive shaft <br />over it. <br />d Cover the boring with a 3/ -inch thick 4x8 plywood or a steel plate 2ft x 2ft in <br />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 />e Direct all surface runoff away from the boring. <br />f 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 <br />the weighted tape. If the boring has collapsed, then the Contractor shall <br />re -drill the boring at no additional cost to the County. <br />I. ABANDONED BORINGS <br />1. If an obstruction or other condition is encountered that prevents the drilling <br />of a well at the location identified, the Engineer may request that the <br />Contractor abandon the boring. If directed so, the Contractor shall fill the <br />hole with neat cement. Neat cement backfill shall be in the presence of <br />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 />B. The Contractor shall measure the total depth of the borehole using a weighted <br />sounding line or other method as agreed with the Engineer and EHD inspector. <br />If heaving or cave-ins have taken place, then the Contractor shall clean out or <br />re -drill the borehole before well installation. <br />C. The Contractor shall ask for inspection by the Engineer of the casing, screen, <br />and any other well construction materials prior to installation. <br />San Joaquin County <br />Groundwater Monitoring Well Specifications 6 Public Works Dept <br />Solid Waste Division <br />