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OUR. <br /> Mr James Barton <br />' July 30, 2004 <br /> Page 7 <br /> Conclusions/Recommendations <br /> Concentrations of benzene, TPHg and MtBE were not reported at or above the laboratory <br />' reporting limits for soil and groundwater samples collected during this investigation The lateral <br /> extent of the dissolved petroleum hydrocarbon plume to the east, southeast, and south of the <br /> site appears to be delineated <br /> 1 Low level concentrations of 1,2-dichloroethane (1,2-DCA), were reported in the groundwater <br /> sample collected from MW-30 on July 14, 2004 Additionally, concentrations of toluene and <br />' total xylenes were reported in groundwater samples collected from MW-28 through MW-30 on <br /> July 14, 2004 Based on historical groundwater analytical data for wells MW-1, MW-5, MW-6, <br /> MW-7, MW-9, and MW-27, located upgradtent and cross-gradient to wells MW-28 through <br /> MW-30, it appears that the low level concentrations of 1,2-DCA reported in the groundwater <br />' sample collected from MW-30 on July 14, 2004 is an anomaly The next sampling event will <br /> further assess whether 1,2-DCA is present in the vicinity of MW-30 Concentrations of toluene <br /> and total xylenes in wells MW-28 through MW-30 are comparable to analytical data reported in <br />' upgradient and cross-gradient B-zone wells during the past eight quarters <br /> Air flow modifications and repeated pulse operations of the AS system within all zones since <br /> June 14, 2004 appears to have caused a reduction of dissolved petroleum hydrocarbons in <br /> groundwater beneath the site ENSR has initiated activities to restart the SVE system including <br /> the resubmittal of permit fees and applications <br /> Based on increases in petroleum hydrocarbon concentrations reported in sal vapor samples <br /> collected from SVE wells and increases in dissolved petroleum hydrocarbons in monitoring <br />' wells ENSR recommends that the SVE be restarted and operated to reduce petroleum <br /> hydrocarbons in soil and groundwater beneath the site <br /> e <br /> J 1Projects10694015098-293TinaMeports15098 Well Results Report doc <br /> 1 <br />' Cr✓e 31, YcarL of E,cellewe in �rivoonmenfaf seivic e <br />