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MW <br /> a <br /> Based on analyses of zone 5 water from MW-20, the amount of <br /> dissolved hydrocarbon that has migrated into z <br /> ' one S is considered <br /> to be small. The dissolved hydrocarbon shown in zone 5 around <br /> wells MW-20 and around former well RW-1, depicts the <br /> effect of downward movement <br /> Of hydrocarbons through the cross- <br /> connected well. <br /> ,q Figure 20 depicts the vertical d=atribution of hydrocarbon <br /> f^� contamination along cross section B-Bo. The relatively thick <br /> sequence of zone 2 underlyingInf trio <br /> tank pit <br /> explains the <br /> perching } <br /> 3 and horizontal migration of gasoline along the zone 1/zone 2 <br /> w ocontact. Once the ' <br /> ma . gasalis,e migrated downslope to the channel <br /> which removed zone 2 <br /> s r , it percolated dawn until it reached the , <br /> 14 saturated.portion of .th•,- zone 3 a i <br /> guifer. Here free product <br /> accumulated on the water table surface. Some hydrocarbons <br /> dissolved in groundwater and were transported horizontally under <br /> the <br /> Prevailing groundwater gradients at the site. Some migration <br /> � of dissolved contaminants from zone 3 into zone 5 occurred <br /> i <br /> p <br /> through theormerlY cross- feted well.at the site.. <br /> _• ter: _ � - <br /> S Figure 21 illustrates the vertical.extent of <br /> contamination in the <br /> narc.a-south cross section C-C° at the east side .of the s <br /> � S 4 <br /> its. <br /> f HYdzocarbon contamination is primarily.restricted to the upper <br /> Part of zone 3,1 with minor contamination <br /> +� of .one 5. Water <br /> 'z samples from MW 20, which is completed only in z,�ne 5, show only .. <br /> _.- low---levels cif---dissolved--hydrocarbons. -------------.-- -- ---- —--- — — - <br /> NY <br /> Q <br /> . F 1 <br /> Nu y <br /> y <br /> l i F <br />