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CLEARWATEX <br /> G R O U P, 1 N C, <br /> Erni ranmev¢trs!Sernfres - <br /> 2.1.3 Recovery Well Installation and Develo meat <br /> The recovery well was constructed with clean, flush threaded, schedule 40 polyvinyl <br /> chloride (PVC), 4-inch 'diameter' well 'Materials. Well' screen, with 0.020-inch <br /> slotting, was extended from 10 to 30 feet below grade. Blank PVC was coupled to the <br /> screen .and extended to the surface. The filter pack .consists of clean #3 Lonestar <br /> Sand installed fro&9 to 30 feet below grade, and was sealed with a 3-foot thick layer <br /> of hydrated bentonite. The remaining. annular space was filled with neat cement. <br /> The well was capped with a locking expansion plug, and a tamper resistant well-box <br /> was .set with concrete over the wellhead. Well construction detail is included in <br /> Appendix A. <br /> Recovery well RW-1 was developed on May 19, 1995 by a combination of surging <br /> and bailing. Following surging, water was removed from the well using a clean <br /> bailer until the water was relatively free of sediment, and pH, temperature,. and <br /> r conductivity of the water had stabilized. <br /> 2.1.4 Sparge Well Installation <br /> The sparge wells were constructed with clean, flush threaded, schedule. 40 (PVC), 2- <br /> inch diameter well materials. .Well screen, with 0.020-inch slotting, was extended <br /> from approximately 23 to 25 feet below grade. Blank-PVC was:coupled to.the screen <br /> and extended to the surface. The filter pack consists of clean #3 Lonestar Sand <br /> installed from 22 to 25 feet below grade, and was sealed with a 3-foot thick layer of <br /> hydrated bentonite. The remaining annular space was filled with neat cement. The <br /> well was capped'with a locking expansion plug, and a tamper resistant well-box was <br /> set with concrete over the wellhead. Well construction details are included in <br /> Appendix A. <br /> 2.2 Groundwater Sampling (4th Quarter 1995 and 1st Quarter 1996) <br /> 2.21 ..Groundwater Gau in -,and Sampling Methods <br /> On October.19, 1995, and January 5, 1996, Clearwater,gauged the depth to water in all <br /> monitoring and recovery wells. A water sample was also collected from the <br /> domestic well on January 5, 1996. The thickness of SPH in well MW-1 was also <br /> measured. Well MW-1 was not sampled due to presence of SPH. The remaining <br /> I� <br /> wells were purged of approximately three saturated casing volumes .prior to <br /> sampling. During purging, groundwater was monitored for stabilization of <br /> temperature, conductivity;-and pH. All wells were then sampled once water levels <br /> had recovered to approximately 80% of the pre-purge water level. Well gauging and <br /> purging field data is presented as Appendix C. <br /> Groundwater samples were collected from the monitoring wells usingde`dicated_-)� <br /> polyethylene bailers. The samples were given the same designationnation as the well <br /> from which they were collected. Samples were labeled, documented on a chain-of- <br /> D-107,PAR/RAP 4 June 11, 1996 <br />