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I' ,=M <br /> a <br /> Golden Grain Company <br /> June 2, 1989 <br /> 202/799-5045.01 <br /> iewing all previou_ly collected data, including <br /> above, after revsurvey. Because monitoring <br /> that obtained during the soil-vapor <br /> wells will be installed in the boreholesr the locations of the <br /> will be chosen so as to provide the most useful data <br /> soil borings ' <br /> groundwater gradient, hydrocarbon impact on soil an <br /> about the g off-site <br /> water beneath the site, and whether or not there is any any from <br /> contribution to the subsurface contaminations <br /> including any <br /> The <br /> the fuel transMission line located upg <br /> well locations will also allow them to be used later in a <br /> recovery system. <br /> resented in Section 2.0, all borings <br /> Based aal the reasoning p except for one that will <br /> will be drilled to a d^,pth of 50 feet, <br /> This deeper borehole will be <br /> be drilled to 75 feet below grade. or to be in- <br /> located adjacent to a monitoring well (existing <br /> led and outside the zone of soil contamination. The purpose <br /> stalled) welk <br /> of this Yioring is to allow the installation o.adjacent We <br /> ta <br /> screened acrass a deeper interval than the vertical <br /> from these two wells will provide information about any <br /> r <br /> gradient in the groundwater flow. <br /> s will be continuously cored to provide <br /> Three of the boring gy and hyc�rogeology beneath the <br /> detailed information about lith�ared borings will be the one <br /> site. one of the continuously <br /> drilled to 75 feet. <br /> 4.4.2 Drilling and sampling Metilods <br /> s will be drilled with <br /> The three continuously cored boring <br /> 7.5-inch outside diameter <br /> (C.D.) hollow-stem augers fitted on a <br /> truck-mountid drill rig. A continuous core will be extracted <br /> from- each-5- feet drilled. A soil sample will then be taken with <br /> GROUNDWATER <br /> TECHNOLOGY.INC. <br />