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rff ""AM"—"Or1A <br /> Working to Restore Nature <br /> A geologist from RESNA collected soil samples from each boring for possible laboratory <br /> analysis and to characterize the geology beneath and near the site Samples were identified <br /> using visual and manual methods and classified according to the Unified Soil Classification <br /> System (Appendix B) The geologist also analyzed the soil samples with a field <br /> photoionization detector to characterize the relative levels of hydrocarbons in the samples <br /> The sediments encountered and the photoionization detector readings are presented on the <br /> Logs of Borings (Appendix B) <br /> 4.3 Assessment of Groundwater <br /> 4.3.1 Groundwater Monitoring Well Installation <br /> i <br /> To assess and delineate the extent of dissolved hydrocarbons in groundwater and evaluate <br /> the hydraulic gradient, ten groundwater monitoring wells (MW-1 through MW-10) were <br /> installed in borings B-2,B-6, B-8, B-9, B-16, and B-21 through B-25, respectively Well MW- <br /> 9 was destroyed due to an obstruction in the well casing. Details on the construction of the <br /> wells are shown on the Logs of Borings (Appendix B) and described on Table 3 <br /> Monitoring wells were developed and sampled according to the procedures described in <br /> Appendix A <br /> 4.3.2 Groundwater Monitoring <br /> RESNA began monitoring the groundwater in wells MW-1 through MW-3 on January 7, <br /> 1992 (RESNA, February 14, 1992) After installation of wells MW-4 through MW-10, these <br /> wells were added to the monitoring program During the sampling events, a technicians <br /> from EMCON Associates and RESNA measured the depth to water, purged the wells, and <br /> then collected samples for subjective and laboratory analyses (RESNA, July 31, 1992 and. <br /> February 16, 1994) A cumulative record of depth to groundwater measurements is <br /> 30003-7 5 <br />