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The monitoring well was finished with a Universal water-tight monitoring well manhole <br /> set into cement A watertight locking cap was sealed with the well casing inside the <br /> manhole. Boring logs/well details are contained in Appendix I. <br /> 3.2.3 Groundwater Sampling <br /> On May 5, 1992, the two new wells and the existing well were monitored and developed <br /> in accordance with RESNA's QA/QC Protocol (Appendix II). Field purge logs are <br /> ' included in Appendix IV Water samples were then collected from all wells, placed on <br /> ice, and transported under chain-of-custody to RESNA Environmental Laboratory for <br /> analysis. The samples were analyzed for BTEX and TPHG utilizing EPA methods 8020 <br /> and 8015, respectively. The laboratory did not detect any BTEX and TPHG at or above <br /> ' method detection limits in any of the monitoring wells Water sampling results are <br /> summarized in Table 2 Laboratory Data Sheets and chain-of-custody documentation are <br /> ' included in Appendix V. <br /> 4.0 SUBSURFACE CONDITIONS <br /> Soils encountered during drilling activities below the site consist of a sequence of interbedded <br /> clays, silts and sands The maximum depth explored was approximately 66.5 feet below grade. <br /> Between the Phase I and Phase II drilling events the static groundwater level has remained <br /> approximately the same Based on May 5, 1992 monitoring data (Table 3) static groundwater <br /> is approximately 48 feet below grade and flows to the northwest under a gradient of 0 0031 ft/ft <br /> or 17 feet/mile A groundwater gradient map is presented on Figure 4 <br /> ' 5.0 CONCLUSIONS/RECOMMENDATIONS <br /> ' 5.1 Soil <br /> To date, approximately 2,100 cubic yards of soil associated with the former tank pit have been <br /> excavated. Impacted soils were removed until field evidence (i.e., odor, discoloration, PID <br /> R-060392 TJL 7 <br />