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CLERK ATE <br /> G R O U P I N C <br /> Envira-me-W Services <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> Depth to groundwater 9 42 (MW-2) to 10 42 feet below top of casing <br /> Flow direction Southeast at 0 0034 ft/ft <br /> TPHg concentration range < 50 gg/L (MW-2, MW-4) to 7,500 gg/L (MW-5B) <br /> Benzene concentration range <0 50 gg/L (MW-2, MW-3, MW-4) to 1,400 gg/L (MW- <br /> 5B) <br /> MTBE concentration range <5 0 gg/L (MW-2 through MW-4, MW-6, MW-7, MW-8) <br /> to 8 1 gg/L (MW-1) <br /> Remarks MTBE was detected by EPA 8020 in the groundwater sample collected from MW-1 this <br /> quarter Previously MTBE has been confirmed as "non-detectable ' by EPA 8260 in all monitoring <br /> wells sampled at the site W <br /> PROJECT STATUS & RECOMMENDATIONS <br /> The contaminant plume is currently delineated and being monitored on a quarterly basis <br /> Clearwater recommends quarterly sampling for four quarters, starting second quarter 2000, to <br /> examine trends in hydrocarbon concentrations and distribution If hydrocarbon concentrations <br /> exhibit a downward trend within the core of the plume, then Clearwater will recommend collecting <br /> data to document remediation by natural attenuation If concentrations do not fall, then Clearwater <br /> will evaluate other options for the reduction of contaminant concentrations <br /> ATTACHMENTS <br /> • Site Vicinity Map (Figure 1) <br /> • Site Plan (Figure 2) <br /> • Groundwater Contour Map - 8/28100 (Figure 3) <br /> • Hydrocarbon Distribution Map - 8/28/00 (Figure 4) <br /> • Groundwater Elevations and Analytical Results (Table 1) <br /> • Clearwater Gauging Data/Purge Calculations and Well Purging Data <br /> • Certified Laboratory Reports and Chain-of-Custody Form <br /> • Clearwater Groundwater Monitoring and Sampling Protocols <br /> • <br /> CGI-ZB178C-3QT00 3 September 6, 2000 <br />