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4 . 0 CONCLUSIONS AND RECOMMENDATIONS } <br /> ' The inve3tigation4 conducted to date have documented diesel F <br /> contamination of the groundwater beneath the site . The newly <br /> developed data indicates that a snail plume of dissolved diesel <br /> hydrocarbons with concentrations below state DOHS Action levels <br /> for drinking water exists on-site . <br /> The minor diesel contamination detected in the groundwater is <br /> well below the designated level to protect groundwater of 1,000 <br /> ppb. It is reasonable to expert natural biodegradation to <br /> p remediate such low levels of dissolved hydrocarbons . However, it <br /> i= cannot be determined at the present level of knowledge if the <br /> Plume may simply not have reached the downgradient wells . In <br /> order to monitor the chemical levels in the water bearing zone <br /> while assuring that no significant expansion of plume size occurs <br /> i? tAn1;V d,. Wells will be monitored and then purged until pH, <br /> temperature and electrical conductivity stabilize . All purged <br /> 1 water will be contained on-site until laboratory results are <br /> received . At such time, trea":tment. and d°isposa - aiterrtaives: wi;l,l" <br /> be evaluated The water samples will be collected per Waterwork <br /> water sampling protocol (Appendix IV) and analyzed for BTEX and <br /> TPH as gasoline and diesel . A gradient map will be prepared from <br /> the water level data . <br /> If quarterly monitoring shows plume migration or an increase in <br /> hydrocarbon levels„ Further investigation and possible initiation <br /> of a remediation program involving hydraulic control can be <br /> Implemented . <br /> 1A <br /> X04 <br /> -s <br /> rf <br /> I <br /> .k <br /> O <br /> r, <br />