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� <br />��� STS CoNSu <br />Pequot Lakes Dump <br />STS Project 97511-YB <br />March 10, 2003 <br />• Site hydrageology has the following characteristics: <br />— The ciepth to groundwater varies due to the uneven topography of the land <br />surface, but was observed at depths ranging from about 33 feet to greater than <br />42 feet below land surface (bls). <br />— An accurate determination of the groundwater hydraulic gradient could not be <br />determined frorn water levels obtained from the boreholes. <br />B The estimated volume of solid waste, based on thic{<nesses of wastes observed in <br />the soil borings, is approximately 3,000 cubic yards. <br />• No significant methane irnpacts were identified in soil borings conducted at the site. <br />�:% Total chromium and copper were detected in surface soil samples at concentrations <br />`./ <br />exceeding standards. <br />� �• 7otal chromium �vas detected in a composite waste sample at a concentration <br />exceeding the SLV standard establishecl for chroniium (VI); meihylene chloride �A�as <br />detected in a waste sample at a concentration above its established SLV but is <br />believed to be the result of laboratory contamination. <br />� <br />� Selenium and mercury were detected in ground���ater samples at concentrations <br />exceeding standards. <br />�.� Three n�eta{s (cadmium, copper, and lead) and tv�o pesticides (4,4'-DDD and <br />U <br />4,4'-DDT) were detected in a sediment sampie collected as part of an earlier Pl�ase I <br />ESA at concentrations exceeding standards. Four metals (chromium, copper, lead, <br />and nickei) v✓ere detected at concentrations above established standards in a <br />sediment sample collected as part of this Phase II investi�ation. <br />• Mercury and selenium were detected in a duplicate surface water sampie at <br />concentrations above the chronic standards established for these metals in Class 2D <br />surface waters. <br />� <br />THE INFRASTRUCTURE IMPERATIVE <br />� <br />, <br />R6118001.do�' <br />I <br />