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I <br /> t 3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Be r 12 2003 the groundwater surface dropped an average of 1 00 <br /> Between May 9, and September g pp 9 <br /> feet, the groundwater gradient increased from 0 0180 to 0 0263 foot/foot, and the groundwater <br /> flow direction remained constant toward the east-southeast The depth to groundwater beneath <br /> the site is at its lowest level, since the monitoring wells were installed in July 2002 Otherwise, the <br /> groundwater surface characteristics are consistent with historical trends <br /> Between May 9, and September 12, 2003, the concentrations of petroleum hydrocarbons in <br /> groundwater generally decreased in all impacted wells The decline in petroleum hydrocarbon <br /> concentrations in groundwater beneath the site is probably a result of prior source removal efforts <br /> and on-going natural attenuation processes The plume of impacted groundwater appears to be <br /> defined at MW-4 to the north-northeast of the former USTs Since the groundwater flow direction <br /> continued toward the east-southeast, the downgradient extent of impacted groundwater remains <br /> undefined <br /> Based on these conclusions, Ramage Environmental recommends that the four monitoring wells <br /> continue to be monitored and sampled on a quarterly basis to evaluate the stability of petroleum <br /> concentrations and groundwater flow and gradient characteristics The next groundwater <br /> monitoring event is scheduled for December 2003 If the flow direction remains toward the east- <br /> southeast, it may be necessary to install additional monitoring well(s) to define the downgradient <br /> extent of impacted groundwater <br /> 7 <br /> �I <br />