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Just beyond the nutermost monitor wells , as shown in Figure 5. <br /> The proposed new outer monitoring wells (discussed later) should <br /> locate the zero line exactly. The local groundwater gradient is <br /> flat and flow rates are slow, so that the rate of horizontal <br /> migration is limited, 1-10 inches per day, under natural <br /> conditions. The direction of groundwater motion has been toward <br /> RW-1 since its installation, which has reduced the area and <br /> concentration of contamination. <br /> i <br /> The hydrogeology of the site is comprised of five distinct <br /> geologic soil zones. The u <br /> � ppermost sail horizon.- is designated as <br /> zone 1; the deepest soil horizon tested was ao 5. T <br /> .. he genera] <br /> characteristics of each zone are graphically res ted to ' <br /> illustrate the interrelations between,.,so1 orizons that exist at <br /> this site. This is shown on t <br /> geolo9i ections A-A' and <br /> B-S', The location and orient,tio he <br /> �f geologic cross <br /> fi <br /> sections are shown on Figur, `. <br /> Geologic cross section A- gore 7, shows Zone 1 is comprised <br /> P <br /> of sandy silts and sand with <br /> good permeability. Zone. 2 is finer <br /> grained material which would inhibit migration of fluids. Zone 2 <br /> s is missins, near well RW-1. it has been eroded -in a HN1:-SSW i <br /> paleo-channel , Figure 8. . This channel allows direct <br /> communication of zones :1 and 3. Zone 3 is sandy silts and silty. <br /> ��+' sands and has good g permeability. The .bottom of .zone 3 is <br /> y saturated: by a,water table aquifer. . Zone is an undErlying <br /> silty .clay and clayey silt aquitard. Zone: 5 is an aquifer a <br /> comprised of silty sands and sandy. silts which have moderate <br /> ` 'vertical and horizontal permeabilities, <br /> 'rTf <br /> _rT <br /> V. <br /> a ; <br /> k i y <br /> � *� _-. � 11 ♦ f .. 1. <br /> J i <br /> �t�fk <br /> jJlP �k� f <br /> y <br />