Laserfiche WebLink
s `` i �< ;,€ ..- ra..�".:` �i..,r.,:x.:iez::st'�'�..a;''�_..AT��y7� �tr.€atP,�i,• �'� 'r ,:chi �: � <br /> 3 <br /> z. <br /> r <br /> Groundwate <br /> r gradients in the area are relatively shallow, so <br /> groundwater impacts on surrounding wells are not expected. The <br /> d greatest difference in groundwater elevation observed across the <br /> site before installation of well RW-1 was 0.4' . The closest <br /> off-site wells are approximately one-tenth of a mile away and are <br /> used intermittently for domestic or agricultural water supply and <br /> irrigation. All of the wells apparently produce from the deeper <br /> a lower aquifer, zone 5 or deeper, It is not anticipated that <br /> their operation or activity will be impacted by remediation <br /> f <br /> activities at this site, Figure 4. <br /> i - <br /> Soil contamination is confined to a small area where hydrocarbons i <br /> have trickled down to the water table. Grou Eater is affected <br /> In a plume oriented northwestward and southea and from the tank <br /> f <br /> pit area, Figure' 5. The horizontal di•s utionof petroleum <br /> �F <br /> hydrocarbons in groundwater is pri "} ited to the area <br /> immediately underlying the s.item it " minor movement from beneath <br /> the property off-site. The` extent of subsurface <br /> hydrocarbon.. contaminatian d cted on Figure 5 showing the <br /> situation on March 31, 7' The close striping pattern depicts <br /> the horizontal extent of b nxene contamination in groundwater in ' <br /> both aquifers 3 ana' 5. Similarly, the wide-spaced stripes show <br /> the maximum horizontal extent or boundary of total petroleum .. <br /> hydrocarbon in: groundwater at the site. The June <br /> groundwater - <br /> sampling showed no contamination in well MW-11. Other perimeter. ' <br /> wells (BIW-12, 15, 16, 17) have shown significant decreases in BTX <br /> f <br /> F7, <br /> levels since RW-1 began operation. Extrapolation of this data <br /> .,� suggests that the. zero concentration line of the plume is now q <br /> w 1 <br /> a .. - <br /> 5 }Y, <br /> lL _ <br /> CiE - - - <br />