9300 W MALL DR 2018-01-01 MF Import

The wetpond control structure should be located at the southeastern corner of the pond to facilitate access to it for maintenance (unless the present location is accessible, it is difficult to tell whether it is or not). An easement should be obtained from the PUD and a 15� wide all weather surface access road should be constructed to the control structure fr.om West Mall Drive. The wetpond does not meet the City's requirements for a length to width ratio of 3:1. Solid baffles should be used to create an effective .length to width ratio greater than 3:1. The standards al.o call for at least one baffle across the width of the pond - this baffle should not be a completely solid baffle. A wooden baffle essentially constructed like a fence in the bottom of the pon3 has been used successfully in the past. A plan detail and information on an environmentally safe wood preservative are attached for the applicant's in£ormation. An idea for the configuration of tha wetpond, swales and baffles is included. This configcration would address the length to width ratios, the required baffle, the lack of a swale, and the location of the control structure to allow maintenance. However, the applicant would need to demonstrate that adequate detention and wetpond volumes would remain as part of the surface area and depth of the pond would be lost. The two dotted lines in the pond should be labeled in order to avoid confusing future plan users. The outlet of the wetpond must not be below the ordinary water level of the northern wetland. The actual contours for the pond and how they relate to the surrounding topography must be shown. Only minor grading in the wetland buffers is allowable. The SEPA conditions call for a 10 foot buffer between the wetpond and any buildings. A planting schedule for the treatment areas of the wetponds must be approved by Public Works. The plan should call out the type of vegetation to be planted, the density of the plantings, and the total number of plants needed. Plants suited to the depth of water in the treatment areas should be used, such as hardstem bulrush and/or cattails. The density of the plantings should be one every 1-2 square feet (approximately). jjn,� �,��a deia�l n�„s1- c�e�-�y show -Fi�,e ��F� o�+he pond �u be pl�n�eci clnd c� noi-e 5hu�lcl �e�e�ence -thC �lan rir�� S cbud��e --11�u sc�v-c��le sh��1c! a lso foe ��cl�decl �n -�, e p �a�s .