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'< r <br /> ENVl,��)r;iv,-N7 <br /> p��M'TISEr vIC <br /> S <br /> contamination has moved northly, which is the indicated direction <br /> of groundwater flow. <br /> 3 . A "zero" line has not been fully defined to the north and <br /> northeast , and there are insufficient data at this time to define <br /> the size and direction (s) of the plume. <br /> I <br /> 4 . Additional work will be required to define the lateral extent <br /> of groundwater contamination. Additional spoil was removed from <br /> the site of the UST, but due to space constraints, it was not <br /> possible to remove all the contamination. The spoil has been <br /> removed to a licensed landfill, and the excavation filled with <br /> clean pea-gravel and covered with concrete . Refer to the Interim <br /> Assessment report, dated March 20 , 1995 , prepared by Wm. J. <br /> Hunter & Associates, for details of that work . <br /> ECOMMENDATIONS : <br /> 1 . It is recommended that quarterly sampling of wells #1 & #3 be <br /> discontinued; they have not shown any contamination since <br /> monitoring began. Quarterly water sampling should continue in <br /> well #2 until conditions change . Water level measurements should <br /> continue in all three wells to determine gradient direction; if <br /> major changes occur, sampling of wells #1 & #3 should be done <br /> again. <br /> 2 . We had previously recommended that an additional monitoring <br /> well be placed in downgradient position in an attempt to define <br /> the limits of the plume in that direction. However, we now <br /> believe that several shallow soil borings in the area to the <br /> north & northeast of MW-2 would allow obtaining more information <br /> than an additional well . Because the water table is now less <br /> than 10 ' below ground surface, such work could be performed <br /> quickly and cheaply. Soil & water samples could be obtained, <br /> which would allow the delineation of both soil and groundwater <br /> plumes in one operation. <br /> We will prepare a workplan for conducting that work, but because <br /> of the State Fund' s staff requirements for preapproval, it will <br /> take additional time to obtain sufficient bids, etc . , to comply <br /> with those rules . Your correspondence of April 10, 1995 <br /> requested a workplan be submitted by May 15 . Due to an extremely <br /> heavy workload, and the necessity to solicit bids for the work, <br /> we will be unable to meet that time schedule . We request an <br /> extension until July 1 to comply with that request . <br /> 2 <br /> I <br /> I <br /> I <br />