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R <br /> SITE PREPARATION <br /> rhe well completion data listed in Figue R 's legend suggests that <br /> geohydroioglcal zones 3 and 5 are crossconnected in man <br /> - y places <br /> by domestic and agricultural wells in the area surrounding the <br /> Lodi site. A high degree of crossconnection is also suggested by <br /> t <br /> ? the geological cross sections A-A' and B-B ' , and by the <br /> observation that water levels observed in wells MW-19 and MW-20, <br /> wells completed solely in zones 3 and 5 respectively, are very <br /> (( similar. <br /> 3 <br /> Before beginning active remediation work invoivi the active <br /> circulation of nutrient solutions through thg sub face of this <br /> site the hydrological p <br /> g properties of the cr nate %lquifers, <br /> zones 3 and 5 need to be defined. So' � T revi <br /> .+sly drilled <br /> on the site were completed so that' e gra el packings and i <br /> - screens completely span the zon q drd and open into both <br /> p <br /> the zone 3 and zone. 5 'aqui" ers. T e wells and graver packings <br /> I have created` vertical hydro 1 connections between the two. i <br /> f i <br /> zones:.and interfere with proper well testing ,and ;solution <br /> 7 control : To "provide proper conditions for testing the hydrologic <br /> properties of' zones 3 and 5, all artificial interconnections need <br /> a <br /> to be" removed. <br /> We pian to remove or redrill: these leaky wells, Table 5, and <br /> conduct adequate.weil tests so that in situ biological <br /> remediation efforts can begin. Otherwise, movement of the <br /> nutrient solutions cannot be effectively controlled. To abandon <br /> �f wells, they will be drilled out. to remove the casings and <br /> campletion materials and then completely backfilled ' <br /> with a i <br /> a <br /> i <br /> Y� <br /> ✓�' i; t '_: i " #� .'—'l foot' � �� / '. <br /> 1 <br /> x 1 <br /> x1 . .. C�'dS:EcMW4�T�7 - <br /> � a i � . •l <br /> 1 <br /> r <br /> s - <br /> i��{¢ _ <br />