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, i!. rel a}l s;�t. � ,i�f z.t:l - - �; '• t 's ! s ., x-. - t 4 � 'a <br /> O.""A 1;-1 • W ad k ., i. d <br /> 1p <br /> H �k r �-• - ,`. \ J rr-moi - , •� ? , { �, - ,x - ,, i�' t <br /> t� ,'� x , November�3 995 r � ,.- , �• ,` a= �, :. <br /> NC(`LProject N0. <br /> 95-0114 <br /> 'Page. 22 . <br /> 6 V <br /> h9, I fJ .. y_,•a- <br /> 2r3, INITIAL SOIL' AND.GROUNDWATER INVESTIGATION'S <br /> ' groundwater monitoring,wells (MW-1,.MW-2 and MW.-3) were,installed at the•site:an 23 .- <br /> 'Three <br /> October,1993 :No TPH or BTE&X were.'detected in soil:samples collected from MW-1 and'•MW-2 . <br /> during drilling: However,�petroleum hydrocarbons.were detected-in soil'samples collected'from'MW- ' <br /> 3 at concentrations up to 2;000,ppm. <br /> Ground water samples have:been collected infrequently between November 1993 :and'July 1995. <br /> Petroleum hydrocarbons have been.detected in each well.during each sampling event. <br /> During installation 6f M-3, a surge block used for'developmenf;could not be-retrieved-frorn the well <br /> and remains at a_ depth'of approximately 45 feet'inahe well. Because'of the blockage'in the well, .= <br /> r= , samples obtainied from MWJ are,questionable. Numerous attempts have been°made to recover the+ <br /> surge,block; none have been successful. ; <br /> GROUND WATER PLOW DIRECTION AND GRADIENT 1 <br /> Since installation'of the,three-monitoring well s,•depth'to groundwater has averaged 42:43 feet. Since <br /> Janua 1994; the round water flow direction has remained between,'N'.5° E'and',N'43 °•,W. <br /> . rY g <br /> 2.5. =ADDITIONAL SOIL.AND GROUND WATER ASSESSMENT ' <br /> The down gradient extent of the hydrocarbon impacted soil and ground water'has,nat been defined; <br /> therefore the PHS-EHD is requiring further assessinent'ofthe:imparted..soil.and ground Water.,, <br /> r <br /> 3.0.` SCOPE OF WORK <br /> 3:'1. DRILLING AND.SAMPLING- ' <br /> : The proposed sco a of work includes+the drillin and installation of three round water,monitori <br /> P P P, .g. g g,:­ <br /> wells <br /> F wells and.the'abandonment of one existing well: <br /> .. . The first,bori' will be drilled 'mmediately!adjacerit-to the existing MW-3 and completed'a_s"a,2-inch <br /> .diameter.ground water monitoring-well;MW=3'will then be abandoned b k-essure routin thecae " l <br /> • Y g. g Dl <br /> Two additional wells will be installed offsite. h� <br /> A second.boring will,be;installed West of the' Ate; along the west side of Van Buren Street:• This-well' <br /> E ' :'will be.drilled to a depth of approximate,ly'.65 feet and completed:as a ground water.monitoring well. <br />