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SQ -Y OF RESULTS TO DATE= <br /> The results of an analysis of all of the work done on this site <br /> since removal of the UST' s is briefly summarized below_ <br /> 1 . The lateral extent of the plume has not yet been defined. <br /> 2. Although the UST's and a considerable quantity of contaminated <br /> soil has been removed, significant amounts of BTEX & TPHG still <br /> exist in the soil and groundwater. <br /> 3 . Natural bioremediation may be occurring, but evidence to date <br /> is inconclusive. However, it is expected that a gradual decrease <br /> .in the levels of hydrocarbons present should occur, assuming <br /> there is no other source contributing to the contamination. <br /> CONCI.rUSIONS <br /> It is apparent that additional investigative work is needed in <br /> order to define the limits of contamination, a workplan to con- <br /> duct that work is being prepared at this time as instructed by <br /> the San Joaquin County Environmental Health Division. <br /> Quarterly monitoring of the existing wells should continue during <br /> the next investigative stage, and would include any new monitor- <br /> ing wells that may be required. We will continue to provide <br /> reports covering the monitoring activities. <br /> SincPteen <br /> W <br /> Wm. r & ssociates <br /> cc: orp_ DGr�E D <br /> NO.MOf <br /> „ <br /> i <br /> 2 <br />