Laserfiche WebLink
E. Well Survey <br /> The measurement point at the top of each well casing will be clearly marked, and <br /> the elevation of the measurement point determined using standard surveying <br /> methods. The vertical surrey shall be reported to the nearest 0.01 foot <br /> referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal <br /> coordinates for mapping well locations shall be surveyed and reported to the <br /> nearest foot. Coordinates shall be in State Plane Coordinate System Zone 3 <br /> using North American Datum of 1983 (NAD 83). <br /> ' Surveying shall be conducted by MacKay & Somps and Carlson Barbee & <br /> Gibson. Any deviation that requires utilizing a different surveyor shall be <br /> identified in the Groundwater Well Project Description Addendum(s) and <br /> ' confirmed and documented in the subsequent Well Installation Report(s). <br /> F. Monitoring Well Destruction <br /> ' Monitoring wells may be approved for elimination from the groundwater <br /> monitoring network. If approved for elimination, proper abandonment procedures <br /> ' shall be implemented. The principal objective of destroying and sealing <br /> abandoned wells is to restore, as far as possible, the original (natural) <br /> hydrogeologic conditions that protect groundwater. The following general <br /> ' procedure shall be employed to destroy and seal monitoring wells that are <br /> approved for abandonment. <br /> ' 1. Obtain well destruction permits from the Environmental Health Division, San <br /> Joaquin County Public Health Services. Perform all work in accordance with <br /> County Well Standards. <br /> ' 2. Schedule well destruction inspections with the County and perform all sealing <br /> operations in the presence of a County inspector, unless directed otherwise <br /> ' by the County. <br /> 3. Over-drill the wells with a drilling rig equipped with a guide bit positioned over <br /> ' the existing well casing. The total depth of the over-drilled boring will be <br /> approximately 20 to 25 feet below land surface (the typical design well depth <br /> is approximately 21-feet below land surface). <br /> 4. Remove the PVC well casing from the borehole. <br /> 5. Seal the borehole by pumping a neat cement mixture through a tremmie pipe <br /> starting from the bottom of the borehole and allowing it to flow upwards to the <br /> land surface. <br /> 1 $ <br />