Laserfiche WebLink
. I <br /> axtena to Casino F.oad on tae sou:h, �ne niosiltration swale <br /> an Lne nor:h and notthwest, aaa tce pzaptrty boundary on tn� <br /> east. The wat�r wiil enter s�� wecland portion ot sh� <br /> :nmpoaent sttrouQn a auriac• wat�r awale in th• norch��it <br /> corner of cn� si�e. Thss wacer will be eoll�cc�a irom th� <br /> rooftoos sarouQri a pipe syatem undern�atn the paved porcions <br /> oL tna s1t• to b• datct.arqed at this point. Watet w111 Llow <br /> into che wetlana wher• at will accumulat� until iL reach�s 1 <br /> foot in �l�vation. From this poant, tne was�r will flow '`� <br /> southwest�rly into a common collection baain for the roof <br /> Wat�r anri th� pav�d sursace area wat�r wnich will r�ach this <br /> point �hrouph a araaalin�d iwal• syst�m. Th• qrasalaned <br /> swale aill b• 3 :1 slop�d wath a flat boctom. The area will <br /> ae open prsaa, allowinq maint�nanc• aa recommsnded by the <br /> Horn�r r�port of Unlversity oi Washinpton and the Naahinqton <br /> Depa�tment of Ecolopy. <br /> r� <br /> 11s Lhe watet completes its treatment sn the <br /> aioiiltrataon swale, iL will be discharQea into the common <br /> colleccion aatentaon area before betnQ discnsrpec throuan <br /> the existlnq culverc under Casino koad. <br /> Tne •levacion of tne entire aystem ss requiated by tAe <br /> inve:t-elevation oP :he culvert exitiaa tnt aite under <br /> Caslno Road. Th• auritce elev�cion ui the wetlans rortaon <br /> ox �ne mit:oation componen[ w1�1 re tefs a� exi��ir.a araaas . <br /> Siopea szaas oi u.e wetlann poruon oi tae c:,mper.en[ �aill be <br /> :reac.c with zill material extenaina to meec Lhe sie�walr. <br /> snd reaa-siae elevstions alonq tue noutr: ssae a�u�tina <br /> Casino hoaa ana [o tnis elevation aiona :nt eas� �rope:��� <br /> noundar!�. [t will excena to a aike-hiat. elevation aior:a the <br /> norcn ana wes[ sid�a oi tne mitlga[ion area to create a <br /> aeparation between Lh• mi�ioation and bufier ar�as and che Faa <br /> sursace uater ciofiltration praaalsaed swale nystem. The <br /> qrasslinea sNale uill be praded ac a 3':i slope alona Lhe <br /> insid• alopes. From the ilat boCtom, th�y will ae qraded up <br /> slipntly to parkinQ iocs or the entry road. <br /> 3. Results. <br /> 3.1. Veqetacion. <br /> The vegetation proposed includes a �nix ot emerQen[ <br /> marsn and prasa apeeies includanq three-square buirush <br /> ��cir�us a�erica,}}�},s � , sostrush (,�uncus �ftusus) , biq-stem <br /> buiruan (Scireus acutus ! aaa spikeruah (E!eQcharis <br /> paiuscrisl in the nortneaat curner of the wetlana p�rtion oi <br /> cna area. Tnese aeaaes and rushea Will act as e <br /> baoiil�ration cnamber to cil�er out any a�diments LGiL may i <br /> be dlacnarqe�l witA she rooLLop water. The weat two-inlras <br /> oi tne marsn area wall ee planted with a ws�lanc qrass m:x <br /> iacluu�a rtdLop tAprost.as aiba� velvet �rass tholcus <br /> 3 <br />