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k" <br /> 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 wall was also <br /> T;�is sezu was allowed to set for 24 hours before <br /> installed by free-falling from surface. <br /> ell devel <br /> subsequent activities of w ,ment wind sampling. <br /> Nil <br /> The top of each mon*',)ring well was protected by a water-tight locking cap with lock <br /> inside a flush-mounted, watertight traffic box mounted in concrete ar = sloped to about <br /> one inch above grade to drain away surface water. <br /> } <br /> Each monitoring well location was surveyed by a California registered land surveyor <br /> for exact elevation relative to the USGS MSL datumThe elevation was surveyed at a: <br /> measuring point marked on the top of the well casing, which is the point from whirl, all <br /> i{ water level measurements were recorded. <br /> WELL DEVELOPMENT <br /> mechanical sur and Bailin with a Teflon (trademark <br /> �. Each well was developed by ging g <br /> i <br /> name) bailer. Evacuation of water way performed until the water was generally free o <br /> 9 sediment Temperature, pH and specific conductivity parameters were measured in the <br />= '. <br /> field during development <br /> e. WATER-LEVEL MEASUREMENTS <br /> Each monitoring well was measured for static water level with a battery-powered <br /> i , <br /> £ , with a recision of + or - <br /> sounder before sampling activities began and after purging p <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 pertinent <br /> water level information. <br /> GROUNDWATER SAMPLING <br /> purged p Equipment used was a <br /> i The standing water in each well was ur ed before sampling. Eq �P <br /> Teflon bailer. Each well was purged until 3 to Ile5 well volumes were removed. Dunng <br /> purging, the parameters of temperature, pH, and specific %;onductivity were measured. <br /> T: Sampling was performed after these parameter readings stabilized for two consecutive <br /> z <br /> •'t: 3-3 <br /> 175-07.823 4/24191 <br />