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1 <br /> MW-3, MW-4, and VW-1 Low levels of petroleum hydrocarbons were detected in samples collected <br /> from VW-2 and VW-3 <br />' On October 3, 1995 Clearwater Group, Inc supervised the installation of two soli borings (VW4 and <br /> VW-5) The borings were completed to depths of approximately 40 feet and 50 feet, respectively <br /> Soil samples were collected at depths of 20 and 30 feet from VW-5 <br /> Analytical results are summarized in Table 4 Solt boring logs, monitoring well logs, and Vapor well <br /> logs are included in Appendices E, F, and G,.respectively <br /> 4_3 Assessment of Groundwater Contamination <br /> In March 1992, RESNA installed groundwater monitoring well MW-1 to a depth of 85 feet using a <br /> hollow stem auger drill ng The well was constructed with 2-inch diameter PVC casing and completed <br /> I as shown on the well log contained m Appendix F The well was monitored, developed and sampled <br /> for TPHg and BTEX <br />' Toluene, ethylbenzene, xylenes, and TPHg were detected The well was sampled again in February <br /> 1993, and samples were analyzed for TPHg and BTEX The sample contained no detectable <br /> concentrations of petroleum hydrocarbons <br /> Three additional groundwater monitoring wells, MW-2, MW- <br /> 3 and MW4, were installed in October <br /> 1993 The wells were constructed with 4-mch PVC casing to an approximate depth of 85 feet The <br /> well logs are contained in Appendix F The wells were monitored, developed, and sampled for TPH& <br /> TPHd, and BTEX <br />' TPHd was detected as a non-diesel mux with discrete peaks in samples collected from MW-3 and MW- <br /> 4, at concentrations of 86 and 330 parts per billion (ppb), respectively TPHg and BTEX were not <br />' detected in any groundwater samples collected <br /> Groundwater samples have been collected and analyzed quarterly for TPHg and BTEX since October <br />' 1993 The purpose of groundwater monitoring was to verify the extent of hydrocarbons in <br /> groundwater, monitor the fluctuations in concentrations of dissolved hydrocarbons in <br /> groundwater, and monitor the depth to groundwater The most recent groundwater monitoring <br /> and sampling event was completed by a Smith Environmental technician on January 9, 1996 A <br /> cumulative record of groundwater monitoring and sampling data is presented in Tables i and 2, <br /> respectively The groundwater gradient on January 9, 1996 is depicted on Figure 3 Copies of <br /> field notes are contained in Appendix A and laboratory reports are included in Appendix B <br /> w W5141\quanIy\4gr--1445 doc 5 <br /> SN�TN <br /> 1 <br />