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c <br />v: <br />Ap^i- -% • »*f <br />riBlfTEFi' <br />• •!4 4, L. <br />• <br />Dear Kr. Sween: <br />The land owned by the Freshwater Biological Institute <br />appears to be an ideal natural site for a spoil arc-'.* <br />We estimate there are about 11,600 to 13»000 yards of <br />material to be removed from the lake association and <br />Institute sites. The contained volume of the "'i.ish shaped’’ <br />spoil area is such that the Institute will cr.;i ••r". <br />a flat field approximately level with the r.igh areas aov. <br />Another real benefit is that, as we pump, th? sludge will <br />be retained several days before water runs into tne lake. <br />This allows time for the suspended solids to settlf- out <br />and guarantee the runoff water will meet E.P.A. ,sprclfica- <br />tions for turbidity and suspended solids content. <br />As the pond becomes filled with r.ludcse near thv rni cf xii? <br />project, the volume left for corr-ainir.g the sludge \/ou3u <br />be reduced. To insure cnoug?h holiing oap'icity Ter the <br />entire job, we Viould build c. temporary barrier to nolu the <br />water longer, The barrier v»oul.l be a combination of <br />snow fence and r.uaued up dirt fvor'. the- incide. The dirt <br />barrier wtald bs no higher than t’.o feet in .-.ny spot end <br />would be Is'/elcd once the dredging is idne.. <br />Finally, v/hen the ere? hes dried sufficiently, the spoil <br />will be leveled and seeded, irince lake bottom material is <br />normally sour when first removed, it vou3 i be best to wait <br />until l2 te fall or early next opi*ing b-'fore sei'ding, <br />^ I <br />& <br />rely yours, <br />V7.~ 'Movok, Pif-cident <br />ri'.T-v:-;d'JS,Tuc. <br />?a:.* •P.oc.:.^ r.lf'U <br />NIINI'DRIDGi, Inc. P.O. BOX 3BS • CAST GRAND FORKS, HINNESOTA 56721 niCPHONE 218-773-3331 <br />. . V