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MEMORANDUM --� <br />'('p; Paul McKcc <br />I� RONI: June Zimmennan <br />llA7T: August ]2, 200-1 <br />SU13.►1;C7': Revision to SEPA# 03-2G, 8��crctt P4all Lxpansi�n. 1402 <br />SG Evcrett Mall Wa�- <br />My comments on the subject project arc: <br />A significant portion ot'thc sitc discharges to thc south in a convcy.mcc s)'s�cm, and to a <br />detention pond, that are located within parccls shown as "separate ownersiii�i' on thc <br />currcnt si�e plans. 7lic LvcrGt Mall m.ist have or oblain drainagc casentents to ha��c Ihc <br />riglu to dischargc to thcsc off-sitc facilitics. If cascmen�s do not cxiu, or cannot bc <br />obtaincJ, tl���� Ihc runoff currentl}' discharging to ofl'-sitc facilitics mu�l hc rc-diitctcJ to <br />an Gvereu 'Mall storm�caler rontrol facility where it will receive equivalenl delcntiun and <br />U'Cal �1tC �l t. <br />Thc existing on-sire facililiex �vere designed �o provide an unknown volumc uf �Iclentian. <br />There is an caslcrly and x westerly pond connected hy a 24-inch pipe, und a 2�1-inch outict <br />pipc from thc wcstcrly pond that appcars to scrvc as thc onl}' resu'iction for thc sy�tem. <br />However. the westerly pond recei�es a significant amount of off-sile drainagc and a <br />ignificant amount ol dctcution may aclually occur in thc connectcd ponds. '1'hc ultin�atc <br />�lischargc locution for Ihc c.,stcrly and weslcrly pondti and off-silc pond is lo a culvcri <br />under 100°i Yl.�ce SL=, lo the south���est ol thc Everett Mall. "I'his culvert discharges intu <br />Sih�cr Lakc Crcck. �'his projcct shall not mukc moditicalions ta thc existin,_ s�orm�vatcr <br />cunU'ol f:icilities Ihat ��ould retiult in an increase of �he rale of stormw.itrr runol� enterin�� <br />thc do�vnsu�eam draina�,c s��slcm. <br />fhc condiiiun of thc connccting pipc bct���ccn thc c�utcrly and a�cslcrly punds. .md thc <br />nuUel pipe Irom Ih� ��csiu�ly pond. nmst be detennined. These pipes arc huth murc Ih,m <br />?> years old. and .ue likely made ol corruga�e�i mctal. If neressary. the ��ipes shall he <br />rcp,iircd �n� rcplaccd a� p;u1 ul Ihis projrct. <br />f3ccausc Ihc silc is locatcd �vilhin Ihc Sihcr Lakc draina��c hasin. a��'rlpund in ,crics �� ith <br />a vcgctatcd svalc is requircd to provide nturm ���.itcr uealmcm. 'I�rc:umcnt ul s�orim��atcr <br />nuiofl is rcquired from all ne��� and rede��eloped paved areas. The City ma�� �+ai��c thc <br />rcquircmcnt �ix:i vcgclatcd swalc il thc stonm��alcr man:�gcmcnt plan pruridcs fur an <br />� <br />1 <br />i3'; <br />i�Aj�iinui�imAwmdA..III`0 <br />