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� <br />NOU-07-2aQ3 10�47 RICE CREEK WRTERSHED <br />pec-rr►.it A lieation No. O1-S7 Harstad Companies <br />651 766 4196 P.06i07 <br />!6- Xs •�'reliminaty Subswrface Investigaiion prepared by Braun� Engineering <br />Testing, Inc., dated June 1 G, 19�7, Xeceived August 9, 2001. <br />f7, �$13,000 received from Eichi, Ir�c., on June 25, 2001. <br />�indings: ]. Propased pzojeat entails �n 11 lot sin�le family residential <br />developmen.t on S� acres. A1l proposed hotnes have frantage along <br />the existing Lan�vievv Drive east of Siiver Lake Rvad.. No nEw <br />streets or stornnsewer is proposed. Tk�e site is ultiruately �butary to <br />Rice Creek �via overland flow thraugh wetlands downstream of <br />Silver �a3c� Road. <br />2, The proposed plazt addresses 17istrict rate control, water quality <br />treatment, and infiltration requirements via an onsite rT[JRP pond <br />Y r nt�ri:finxiai 'x:s:'�acc��� <br />arid a sediment/infilt�ratian trap. , <br />� <br />� _ , <br />s. <br />The praposed pc►nd NVJI- is below the adjacent wetland baundary <br />elevatiar�s. However, the vvetiand is ditched to the south with a <br />lower oufiXei eleva.rion and based on submitted sail borings, a�p�a�rs <br />to be predomunantly surface water driv�n. Therefor�, the praposed <br />pond outlet invert shauld not �.ewater the wetland. <br />3, Tk�e Wetland Delineation Technical Memorandum identifies the <br />onsite wetland as �mergent and forested (as pet NWI maps <br />Type 6/7), Proposed wetland impact is 0.51 acres via fill fo� hause <br />P��• <br />Froposed wetlan� replacemerit includes four new we�land credit <br />� adj acent ta the western � edge of the impacted wetland for � tatal <br />a.b7� of A:£� acres of IVW'C• In addifipn� �he replacement pian i.noludes <br />6 s� acres of PVC via upland buffer around NWC areas. T}le <br />�,z�p ro pased wetland re placement plan satisfies WCA r�t�u�irements, and <br />se.�uencing discussion has been deem�d acceptable. <br />4. The 100-year #lood elevation for the site is 892.4. Supporting survey <br />information has be�n submitted identifying a wetlan� EOF elevation <br />of 890.7 (Silver Lake Ro2d centerline downstream af the sit�). The <br />lowest progosed �'irst floo�r eIevation is 894.0, 2 feet above �he 100- <br />year elevation and 3.3 feet above the identified EOF, th�reby <br />satisfying District freebdard requirements- <br />Emmons & Olivier Reso�u�ces, lx�c. <br />10 1 / �l <br />rr�r7 f p, <br />