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Y <br /> r <br /> 1#i <br /> i <br /> " <br /> Harding Lawson Associates <br /> marginally attractive and will not be given further consider-- <br /> t ation. <br /> Horizontal extractions stern - This system involves <br /> installing horizontal drains at strategic locations around the <br /> site. These drains could be designed to act passively or <br /> actively. in a passive system, such as the traditional "French <br /> �,. Drain", water flows into the drain without any mechanical induce- <br /> ment, collects in sumps along the drain and is pumped out period- <br /> ically for treatment and/or disposal. Because this type of <br /> system would establish a minimal zone of influence, the best^ <br /> �. <br /> locat ori,-for it:.would be,..,dbwngradient,-:'o� the...plume, on.the'.' <br /> ' stern-ani northern sides of ;the -building. In this location, <br /> «' the drain would act as a passive interceptor. <br /> 1 orf active -e,mwinvolve placing the drain -under <br /> suction to "assist in_'pu113ng,'ground water into it Because of <br /> p ► ;,a:'zone of?a.nflixence larger.than=that,.created,- <br /> - � the--idechar►ical.� uli <br /> with apassive stem would 1y be�_;established An advan <br /> . Y pr <br /> bbab <br /> ttagf an;;active hornzarital sy <br /> s ostem; aver vertical extrac. ion, <br /> ( wells.-is that a .s stem with a-com -arable: radius;of..influence.-' <br /> k w�11 cover ;a m>.ah larger area::because of its;:horizontal,.orients- <br /> n tion: Therefore, considering its larger zone of - influence and <br /> greater.:rate of withdrawal, the optimum',location "dor an active ; <br /> system; would be along' the`.southerd nd eastern sides of;`the <br /> y ._.-. _ . <br /> building, thrrugh th- known,',area .of ,highest-hydrocarbon; concen- <br /> trations. <br /> r <br /> & 4 <br /> 11 RMPM annul <br />