Laserfiche WebLink
<br />will be evaluated using a decontaminated, clear PVC or Teflon <br />bailer. The presence of light-phase organics (llfloatersll) will <br />be evaluated first by lowering the bailer to a depth of <br />approximately two feet below the top of the water column in the <br />well. The bailer will then be retrieved and visually examined <br />for immiscible light-phase liquids. If present, the thickness <br />of the immiscible layer will be measured and the liquid decanted <br />and preserved for analysis. <br /> <br />The presence of dense-phase organics ("sinkers") will then be <br />determined by lowering a dual valve bailer to the base of the <br />well. The bailer will then be retrieved and visually examined <br />for immiscible dense-phase liquids. If present, the thickness <br />of the immiscible layer will be measured and the liquid decanted <br />and preserved for analysis. <br /> <br />Conductivity, pH and temperature will be monitored during well <br />development. The wells will be developed until these parameters <br />stabilize (and sometimes beyond this point) or until the well is <br />bailed dry and will not produce a sufficient amount <br />of water to continue development. If well headspace measurement <br />indicates the presence of organics or if a light or dense <br />immiscible layer is observed, the development water will be <br />contained in plastic-lined 55 gallon drums pending results of <br />the laboratory analyses of water samples collected from the <br />well. <br /> <br />The water level probe used to measure water levels and well <br />depths, and the bailers and pump used to purge the wells will be <br />decontaminated before each use. The water level probe will be <br />rinsed with distilled water. The bailers and hand pump will be <br />decontaminated in the following manner: <br /> <br />1) <br />2) <br />3 ) <br /> <br />Scrub with non-phosphate detergent solution <br />Rinse with distilled water <br />Wrap in plastic until needed. <br /> <br />If polyethylene ropes are used to raise and lower the bailers, <br />they will be discarded between wells. If a single strand wire <br />cable is used, it will be decontaminated in accordance with the <br />procedure described above. <br /> <br />Byrn & Associates, Inc. of San Marcos, licensed surveyors in <br />Texas, will be contracted to survey the coordinates and <br />elevations of the monitoring wells. Jones Environmental <br />Drilling, Inc. of San Antonio will be contracted to conduct the <br />drilling and well completion activities. <br /> <br />The well installation and development information will be <br />transmitted to the City via a letter report with the following <br />documentation: <br /> <br />4 <br />