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The remaining annular space (above the bentonite plug to surface) was sealed using a <br /> ` mixture of 95% Portland cement/5% bentonite powder. This annular sea] was also <br /> installed by free-falling from surface. This seal was allowed to set for 24 hours before <br /> subsequent activities of well development and sampling, <br /> �s <br /> The top of each monitoring well was protected by a water-tight locking cap with lock <br /> inside a flush-mounted, watertight traffic box mounted in concrete and sloped to about <br /> one inch above grade to drain away surface water. <br /> Each monitoring well location was surveyed b CaliforniaY a registered land surveyor <br /> for exact elevation relative to the USGS MSL datum. The elevation was surveyed at a <br /> measuring point marked on the top of the well casing, which is the point from which all <br /> water level measurements were recorded. <br /> WELL DEVELOPMENT <br /> jr Each well was developed by mechanical surging and bailing with a Teflon (trademark <br /> name) bailer. Evacuation of water was performed until the water was generally free of <br /> sediment. Temperature, pH and spec conductivity parameters were measured in the <br /> field during development <br /> R. <br /> WATER-LEVEL MEASUREMENTS <br /> atte <br /> Each monitoring well was measured for static water level with a b <br /> ry-powered <br /> sounder before sampling activities began and after purging, with a precision of + or - <br /> 0.01 feet. All measurements were recorded as depth-to-water from the surveyed <br /> measuring point at the top of casing. Depth-to-water readings were converted to water- <br /> `' level elevations referenced to the USGS MSL datum, Table 1 displays the <br /> water level information. p Y Pertinent <br /> GROUNDWATER SAMPLING <br /> The standing water in each well was purged before sampling. Equipment used was a <br /> Teflon bailer. Each well was purged until 3 to 5 well volumes were removed. During <br /> purging, the parameters of temperature,pe cure, pH, and specific conductivity were measured. <br /> Sampling was performed after these parameter readings stabilized for two consecutive <br /> T <br /> 3-3 <br /> 6 175-07.RS 4/24)91 <br />