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• Section No 6 <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 43 of 55 <br /> 6 7 7 Survey Control <br /> The top of the steel protective casing (TOC) relative to mean sea level <br /> will be measured for each well. The TOC elevations and land surface <br /> elevations adjacent to each well will be measured from established U S. <br /> Geological Survey benchmarks by a licensed surveyor to within the nearest <br /> +0 01 foot A mark or notch will be made on the north side of the steel <br /> protective casing indicating the survey point location TOC elevations will <br /> be re-surveyed periodically to check for well and/or land subsidence. <br /> 6 8 Well Development <br /> All monitoring wells will be developed following construction to remove <br /> drilling fluids and/or fine-grained materials in addition to increasing well <br /> efficiency Well development will be completed using surging and/or pumping <br /> methods described below All well development tasks will be overseen by the <br /> project geologist The drilling subcontractor will be a California licensed <br /> water-well driller <br /> Prior to well development, all well development equipment must be <br /> thoroughly steam-cleaned The equipment will be inspected by the project <br /> geologist before use Well construction data will be reviewed to estimate <br /> borehole volumes and determine the equipment needed to complete the task <br /> Prior to pumping/surging, the amount of sediment accumulated at the bottom of <br /> the casing (if any) and static water levels will be measured and recorded <br /> All water and sediment removed from the well will be stored on site in <br /> . a holding tank pending chemical analysis During well development, samples <br /> 6-43 <br />