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55-gallon drums and has been contained on-site Approximately 25 gallons of water was <br /> removed from each well by this method Once each well was developed, the filter or sand <br /> pack thickness was remeasured to ensure a that a two-foot minimum thickness was present <br /> Following this verification the wells were completed as described above by installing a <br /> ' sanitary seal of bentonite pellets, a cement-grout surface seal and lockingChristy, ty box <br /> 4.3 Sampling of Groundwater <br /> Purging and sampling of each of the wells was performed by Murray & Associates on April <br /> 23, 1993 The well was unlocked, opened and allowed to stand for a few minutes to <br /> release any trapped vapors Purging was accomplished by using a 2-inch by 3-foot stainless <br /> steel bailer to remove a sufficient volume of water to ensure that a subsequent sample <br /> of water collected from the well was representative of true aquifer conditions Purging <br /> continued until the temperature, conductivity and pH of the water had stabilized i e <br /> subsequent values were within 2 to 3 percent of previously obtained values (See Field <br /> Logs, Appendix 2). This was usually accomplished by removing four to five well volumes <br /> All water purged from the wells were contained in DOT approved 55-gallon drums and <br /> will be temporarily stored on-site until analysis of the contained water has been completed <br /> The standing water level was measured before, and after purging prior to sampling to <br /> verify that the well was fully recovered Separate disposable hand bailers for each well <br /> ' were used to obtain the samples required for laboratory analysis for all except the first <br /> well purged The water samples were transferred directly from the bailers to two 40 ml <br /> volatile organic analysis (VOA) vials, checked for headspace bubbles, labeled, inserted into <br />' a foam holder and placed in an ice chest cooled to 4 degrees centigrade g g e for transport to <br /> the laboratory <br /> 1 <br /> Disposable gloves were worn by the technician to collect all samples and were changed <br />' with each sampling event Care was taken to minimize sample agitation from the initial <br /> filling of the bailer to the transfer of the sample to the VOA vial <br /> 10 <br /> i <br />