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450 I <br />COPY <br />GORDON R. COFFIN <br />LAND SUNVIVOII AND DCANNH <br />MIB WATKKTOWN HOAD <br />LOND lake . MINN. <br />77'. (r fr f- i; 7 f <br />f I,‘ ■!;; <br />t • ^ — <br />J I 1^. <br />'0li <br />47S.4I41 <br />art OP ORONO <br />1-10-79 <br />#454 <br />Hr« <jDd Kre. Vjratt Hoa <br />1220 Loaa Linda iTtnua <br />Kound, tilnn. 55364 <br />tear .ir. und lira. Hoet <br />Tho proposed eztenBlon of th& culvert on your propurty vill <br />require the addition of a aanbole at th:^ end of Uie exletlnr pipe <br />alnee a change in grade will reeult. Tho same slzo o:' pipe <br />(27" CK?) will be required to carry the 14 cubic feet per aoeond <br />of runoff generated by a JC-year utom. <br />At the inlet to tho existing culvert a 2,000-oubic-foot <br />storage area exists which should be Milntained. In s'-dition <br />e oiu< •.! stoK.e;o ares of 200 cubic feot oxists at uho outlet of <br />the existing culvert, Olnca thie* will to covorod overi other <br />loasures should taken to maintain this saan amount of retention <br />area. <br />If a riprap filter is pieced near th» inlet of th«.* exietin <br />culvert to a depth of one foot, the storage area thet w«e lost <br />hr/ oxtenuin. thu cuivoru will be inalnt’i'‘.ned, Th^ riprap will <br />also filter out dobrie I’roci reachin.:, thr> lake. <br />If there are any additional questions on this Ratter, ploere <br />contact mo. <br />Lincerely, <br />har': C. Grontorg, r,2, ^ <br />HSG/gre <br />ee: City of Orono <br />^ A* v^ »•« **