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CLEARWATER <br /> C R 0 L " 1 \ C- <br /> Errr rrnnm.rtfaf Strt•u r, <br /> The groundwater flow direction observed this quarter has returned to the northeasterly direction typically observed <br /> beneath the site(Figure 3) The groundwater levels are lower than those observed last quarter by approximately three feet, <br /> which is typical of this time of year at the site <br /> The extent of dissolved-phase gasoline contamination retrains well delineated by the existing monitonng well network <br /> (Figure 4) It is noteworthy that contaminant concentrations this quarter are once again significantly lower than pre- <br /> remediation levels, and considerably less than those observed in the previous quarter This reduction in contaminant <br /> concentrations is likelv the direct result of active remediation at the site from October 1998 to September 1999 <br /> Sample results indicate that the domestic well continues to be free of detectable Gasoline hydrocarbon concentrations The <br /> domestic well will continued to monitored on a quarterly schedule <br /> Groundwater monitoring data and analytical results are presented in Table 1 and laboratory anaIN tical reports are attached <br /> in Appendix C <br /> 2.3 Groundwater Monitoring Recommendations <br /> Results of recent groundwater monitonng indicate that the SVE/AS system had a dramatic etfect on dissolved-phase <br /> contaminant concentrations beneath the site Dissolved-phase contaminant concentrations tar the plume are down <br /> approximately two orders of magnitude since the fourth quarter 1998 Following shut-down of the SVE/AS system <br /> groundwater beneath the site will continued to be monitored for several quarters to evaluate post-remediation dissolved- <br /> phase contaminant trends The wells will continue to be monitored in accordance with the schedule previously <br /> recommended <br /> Well LD Quarterly Annuallv <br /> (1st. 2nd. 3rd 4th Barters) fist carter) <br /> MW-1 DTW TPHg BTEX MTBE <br /> MW-2 DTW TPH2 BTEX MTBE <br /> MW-3 DTW TPH4 BTEX %tTBE <br /> MW-4 DTW TPHa BTEX ti1TBE <br /> MW-5 DTW TPHe BTEX MTBE <br /> MW-6 DTW TPHs BTEX MTBE <br /> MW-7 DTW TPHQ BTEX %ME <br /> Domestic Well TPHQ BTEX MTBE <br /> Ngtes. <br /> DTW=depth to water <br /> TPHg BTEX=by EPA Method 801518020(modified) <br /> MTBE=by EPA Method 8260 <br /> D-107 4Q99 GW&WP Coziffi cation Borings 3 November 15, 1999 <br />