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PaEc i I of 4 I <br />Permit Na. AVA•003197-G <br />n�toAificatirni D.�tc: A1ay I, 2007 <br />I-huur Ilo��� ratc predictcJ by an approeed continuous runofl' <br />modcl, increased hy a factor of LG, may be used. l he <br />hydrologic analysis shall usc ihe �xisting land covcr candition <br />for prcdicting Flo�t• ratcs from trihutary arcas outsidc thc <br />prqjcct limits. Por trihutary arcas on �hc prujcct sitc. �hc <br />:malysis shall usc thc tcmporan• or permancnt prqjeci IanJ <br />covcr condition, ��hichevcr will producc thc highcs� Ilo��� <br />rates. II using thc W\VI IM to prcdicl �lo���s, bare soil arcas <br />:should hc mudcicd as "landsc�pcd. arca:' <br />[xca�atcd material shall bc placcd on thc uphill sidc of trcnchcs, <br />consistcnt �vi�h safety and space considcrationsl <br />i. Check dams shall he placed at regular inten�als �� ithin constructed <br />ch�nncls �liat arc cut down a slopc. <br />7. Prutcc� Drain Inlc�s <br />a. All slonn drai�i inlcts madc operable during constniction shall bc <br />pro�ccicd so th:u storm�v;ucr runolTdocs not rnicr thc convc}ancc <br />tiVSll'Ol \\'1lIlOUI flfti( Lll'llll' �Illl'fC(� or �rc.dcd �u rcmovc scdimcnt. <br />,b. Inlet protection deaices shall he ck:med or rcmo��ed and replaced <br />achen sediment has tillcd one-third of thc available storage (unlcss <br />a diffcrent standard is spccificd b�� thc proJuc� m�nufacturcr). <br />R. Stabilizc Channels anJ Ouilets <br />;,i.. _—All tcmporan on-sitc convcyancc channcls shall hc dcsigncd, <br />�construc�cd. �ad st�hili_zcJ t�_prc��cnt crosion from ihc (ollowing <br />yxpccicd pcak fo��s> — - <br />\ti�es� ol �hc Cascade A1ouNains Cre�e Channcls tihall h:mdle <br />ihr pcak 10-minu�c � cloriq uf Ilo��- Gotn a'1'� pc I A. 10-� car; <br />2�6hour �rcyucnc� slorm litt Ihc Jcvclupcd conditiun. - <br />Allcrnativrh. Ihc 10-�car, I-hour Iluw ratc indicaicd hy an <br />appr�ncJ rc,niinuous runotl mudcl. increaud hy a fac�or of <br />LG, may hc uxd. 'I'hc hydrologic anah�sis shall usc thc <br />csisting land cnv�r can�!9tion �or prcdicline �lo��� r,ucs Gam <br />trihuLin� arcas uu!sidc thc pro.jcct limils. I'or trihWan arcati <br />im Oic projcct sitc. thc analysis shnll u�c !hc tcmporary or <br />prnnancnt pmjcc� land covcr cundi�ion. ���hichc� cr will <br />producc �he highcsl tlow ralcs. If using thc AV��'I IM lo <br />prcJic� fluws. barc tioil arc;�t shoulJ hc mc�dcicd :is <br />„IanJscaped arca... <br />