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CLEARWATER <br /> G R O U P, I N C <br /> E.r,,o..r.fal$eru"es <br /> GROUNDWATER MONITORING AND SAMPLING ACTIVITIES (SECOND QUARTER 1998) <br /> Date of groundwater sampling 5/13/98 <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 8260), TPHd (Method 8015M) <br /> Laboratory Entech Analytical Labs, (Sunnyvale, CA) <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> Depth to groundwater 6 47 to 6 90 feet below top of casing <br /> Flow direction Southeast at 0 012 feet/foot <br /> TPHg concentration range 52 gg/L(MW-2) to 9,200 gg/L (MW-1) <br /> Benzene concentration range 12 gg/L(MW-2) to 230 gg/L(MW-1) <br /> MTBE concentration range <0 5 gg/L (all three wells) <br /> TPHd concentration range <50 gg/L (all three wells) <br /> Remarks no fuel oxygenates were detected at concentrations exceeding the practical quantitation <br /> limits <br /> PROJECT STATUS <br /> Directives from the EHD regarding additional proposed subsurface investigation are pending pursuant to <br /> review of the data contained in this report As directed, groundwater monitoring will continue on a <br /> quarterly basis with the third quarter of 1998 Based on the groundwater sample results presented, <br /> Clearwater recommends the analysis for the five fuel oxygenates be discontinued in future groundwater <br /> sampling events <br /> APPENDIX <br /> • Site Location Map (Figure 1) <br /> • Site Plan (Figure 2) <br /> • Groundwater Contour Map-5/13/98(Figure 3) <br /> • Hydrocarbon Distribution Map-5/13/98 (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 C-178 2Q98 2 July 24,1998 <br />