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CLEARWATER <br /> C R O U P I \ C <br /> E"E1,011mratal sen ire, <br /> GROUNDWATER MONITORING AND SAMPLING ACTIVITIES(FOURTH QUARTER 1998) <br /> Date of groundwater sampling 12/8/98 <br /> Wells gauged MW-1 through MW-3 <br /> Wells purged and sampled MW-1 through MW-3 <br /> Analytes tested TPHg and BTEX (Method 8015M/8020), five fuel <br /> oxygenates (Method 8240B) <br /> Laboratory Entech Analytical Labs, (Sunnyvale, CA) <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> Depth to groundwater 9 01 to 9 64 feet below top of casing <br /> Flow direction Southeast at 0 009 feet/foot <br /> TPHg concentration range <50 gg/L (MW-2) to 26,000 �Lg/L(MW-1) <br /> Benzene concentration range 0 97 gg/L(MW-2)to 1,600 gg/L (MW-1) <br /> MTBE concentration range (EPA 8020) <5 0µg/l,(MW-2) to 140 gg/L (MW-1) <br /> MTBE concentration range(EPA 8240) <1 0 µg/L (MW-2 and-3), <20 gg/L (MW-1) <br /> Remarks no fuel oxygenates were detected at concentrations exceeding the laboratory reporting <br /> limits by EPA Method 8240 (B) <br /> PROJECT STATUS <br /> Implementation of the Workplan, including the installation of three monitoring wells and performing a <br /> well survey is scheduled for early January 1999 As directed, groundwater monitoring will continue on a <br /> quarterly basis Based on the groundwater sample results presented, Clearwater recommends the analysis <br /> for the five fuel oxygenates be discontinued in future groundwater sampling events <br /> APPENDIX <br /> • Site Location Map (Figure 1) <br /> • Site Plan (Figure 2) <br /> • Groundwater Contour Map-12/8/98(Figure 3) <br /> • Hydrocarbon Distribution Map- 12/8/98 (Figure 4) <br /> • Groundwater Elevations and Analytical Results (Table 1) <br /> • Clearwater Gauging Data/Purge Calculations and Well Purging Data <br /> • Certified Laboratory Reports, Chromatograms, and Chain-of-Custody Form <br /> • Clearwater Groundwater Monitoring and Sampling Protocols <br /> • <br /> CGI 0-178 4Q98 2 December 21, 1998 <br />