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1 � <br /> CLEARWATER <br /> (r R O L P 1 \ C <br /> E"Ii rro rr rn rn tnf srra+ce, <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Operation of the SVEIAS system will be terminated at the end of September 1999, because contaminant recovery has <br /> become negligible The mobile Selleco ECAT 250 will be removed from the site,however,manifolding and piping will <br /> remain in place until site closure is achieved <br /> Results of recent groundwater monitoring indicate that the SVE/AS system had a dramatic effect on dissolved-phase <br /> contaminant concentrations beneath the site Dissolved-phase contaminant concentrations for 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 1 D Quarteriv Annually <br /> (1st, 2nd, 3rd, 4th uarters) {1st uarter) <br /> MW-1 DTW TPHe BTEX MTBE <br /> MW-? DTW TPHa BTEX MTBE <br /> MW-3 DTW <br /> TPH BTEX 'MTBE <br /> MW-4 DT-W "'PHe BTEX MTBE <br /> MW 5 DTW TPHg BTEX MTBE <br /> MW-6 DTW TPHQ BTEX MTBE ___ <br /> MW-7 DTW TPH BTEX MTBE <br /> Domestic Well TPHe BTEX MTBE <br /> Notes, <br /> DTW=depth to water <br /> 'T'PHg BTEX MTBE=by EPA Method 8015!$020(modified) <br /> D-107 3Q99 GW&Sys Mon Report 5 September 29 1999 <br />