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7.2 Monitoring We11 Develanment <br /> Monitoring wells MW-16, MW-17 and MW-18 were developed on the date <br /> of the drilling using surge block agitation and bailer evacuation in order <br /> to settle the sandpack prior to placing the bentonite and cement seals <br /> Additional water was removed prior to the sampling of each well in order <br /> to further clarify the groundwater produced in the wells In total, at least <br /> ten times the volume of the well casing in the saturated screened interval <br /> plus one total volume of water in the well casing was removed during the <br /> development process <br /> Monitoring wells MW-19 and MW-20, as well as recovery wells RW-1 and <br /> RW-3, were developed at least 72 hours following completion of the wells <br /> The well development was completed using surge block agitation a n d <br /> evacuation with pumps and/or bailers At least ten well casing volumes of <br /> groundwater were removed from the wells during development Upon <br /> completion of the well development, the water produced in all of the wells <br /> was relatively clear <br /> 7 .3 Monitoring Well Sampling <br /> iBetween September 25 and 27, 2000, ASE associate geologist Ian Reed <br /> collected groundwater samples from each monitoring and recovery well <br /> for analysis Monitoring well MW-5 contained 0 01-feet of free-floating <br /> hydrocarbons, and therefore was not sampled A sheen was present on <br /> the surface of groundwater in monitoring well MW-6 Groundwater <br /> samples were collected from the on-site drinking water well on October <br /> 12, 2000 <br /> Prior to sampling, the wells were purged of four well casing volumes of <br /> groundwater using any combination of Purger pumps, Grundfos pumps <br /> and/or dedicated bailers The pH, temperature and conductivity of the <br /> purge water were monitored during evacuation, and samples were n o t <br /> collected until these parameters stabilized Samples were collected from <br /> the wells using pre-cleaned dedicated polyethylene bailers The <br /> groundwater samples were decanted from the bailers into 40-m1 volatile <br /> organic analysis (VOA) vials, preserved with hydrochloric acid and sealed <br /> without headspace The samples were then labeled and stored on ice f o r <br /> transport to Kiff Analytical under chain of custody See Appendix F for a <br /> copy of the Field Logs <br /> Franks One Stop Report - November 2000 <br /> -13- <br />