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-- � ,c ���t c.-. > (-� � c t' C �C (,- i.i,. t�„ �-i � �. l-. I li ; . , <br /> , ' . .. ., I�. <br /> (IrF�l�l � Gr on �i�ctl-�c- f� l �yP w, tl-� r.•�{� Fn�.� .i , -i( i . <br /> �� � i� Yr•� r� �ar :i i�.,-Y6-, +i%u L7,� f , I1 � .�l�ir-� � . <br /> f� l � � Ir r . , / <br /> / <br /> � When the required vegetated swale(s) are added to the plans, <br /> ,t �' � the paragraphs given in the attached sheet entitled <br /> , i`" � � "Construction of Vegetated Swales'� should also be included. <br /> i ,, <br /> ' The swale seed and plant list from page IV-17 of the City�s <br /> standards must also be included on the plans. A copy of the <br /> ��f) list is attached. The list of additional vegetation for <br /> m��,f� � biofiltration swales was written for a one foot wide swale. <br /> � • c���� Given that the swales on this site are designed to be wider <br /> � � �� than one foot wide, the specification for each vegetation <br /> ��„ `' � , type must be changed from ��25 clumps per lineal foot of <br /> �U' + �� �� swale" to ��25 clumps per sauare foot of swale". <br /> ��l <br /> Stormwater detention is required for the portion of the <br /> parking lot expansion area that does not naturally drain to <br /> Boeing's detention and water quality facilities on the main <br /> fork of Powder Mill Creek. Current City requirements must <br /> be met. The City will determine the required detention <br /> V' volume and release rates if the area discharging to the <br /> existing detention pond is greater than 5 acres. If this i.s <br /> the case, the following information must be submit•ted: area <br /> of thc site, dimensions of the site, slope of the site <br /> (existing and proposed) , and the percentaqe of impervious <br /> surfacea (existing and proposed) . If the area fs smaller <br /> than 5 acres, a drainaqe calculation submission form mnst be <br /> completed and submitted by the applicant. <br /> The existing detention pond to the north must continue to <br /> provide the design volume and release rates for the roads <br /> and parkinq areas that have been constructed on the Fluke <br /> property. Some extra volume in the pond mav be available, <br /> as the facility included extra detention volume for <br /> ✓ buildings that have not been constructed. However, if this <br /> additional volume is to be applied toward Boeing's detention <br /> requirements, a letter from Fluke will be necessary <br /> indicating that they have forfeited the detention volume for <br /> the buildings. It is likely that additional detention <br /> volume will still be needed to meet current standards. <br /> Options could include modification of the existing pond or <br /> underground detention in the parking lot. <br /> � � .�U ' f Per current City standards, a 15-foot wide gravel access <br /> ��c� - � 4,- road with a minimum compacted thickness of six inches must <br /> �� ,<< ���^ i�-v'� be provided for vehicular traffic to the bottom of the pond. <br /> � �,�1 v �C, ,9c �The maximum slope of the road is allowed to be 6: 1 (N:V) . A <br /> � � 15-foot wide all weather surface (crushed rock or better) <br /> �"`� ✓ must also be provided to the restrictor catch basin. These <br /> two standards may require an easement from Fluke for access <br /> to the pond from one of their roads. <br /> All ponds with a maximum depth greater than three fE �t are <br /> required to be fenced with a six foot high perimeter fence <br /> �" unless one of the following conditions is met: <br />