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if <br />April .: ,•. » <br />t *V A. Li. <br />Dear Mr. Sween: <br />The land owned by the Freshv/ater 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 ”Hish shaped’’ <br />spoil area is such that the Institute will cr.;: up=1* <br />a flat field approximately level with the l.igh areas acv. <br />Another real benefit is that, as we pump, tr:.? sludge will <br />be retained several days before v;ater runs into the lake. <br />This allows time for the suspended solids to settle out <br />and guarantee the runoff water will meet S.P.A. ^srocIfica- <br />tions for turbidity and suspended solids conten-*;. <br />r.f xh?As the pond becomes filled with r.ludc^e near xh- <br />project, the volume lefx for conxaiiiisg the sludge' would <br />be reduced. To insure enough holliJ^g saiacity fer tV:e <br />entire job, we would bjild a temporary barrier to noli the <br />water longer. ':?he barrier v/ouii be a cembination of <br />enov/ fence and pusned up dirx from the- incize-. The lire <br />barrier woald be no higher than two feet in anj- spot and <br />would be leveled once the dredging is uone.. <br />« <br />Finally, v/hen the area has dried suffiuiently, the spoil <br />will be leveled and see led. ^*ince la.ka bottom material is <br />Rorraallj* sour when first lemovec, it vou3 i be best to wait <br />until late fall or early next spring b-iore seeding. <br />. \% <br />^iiicerely yours, <br />Vz'z Slovak, P7 r; cisent <br />" liT-lfiTldS, Tnc. • <br />'• •• . Ros.. i r.lcn <br />MINI-DREPGE/ Inc. p.o. box 385 t EAST grand forks, MINNESOTA 56721 TELEPHONE 218-773-3331 <br />■> <br />1