1707 SCENIC DR SNO CO PUD 2018-01-02 MF Import

NO PROJECT LOGITION �� '��!� �� a � 3 /, � CHK. I W.O. N0. 96 6/88 W►TE � 4383C I I I I I I��_ _1- �� -- - Surface water from the area west of the existing substation, mainly gravel surfaces, drains into a ditch which has two concrete culverts, 18" dia and 12" dia, and flows north to an existing catch basin, and through a short run of 30" dia pipe discharges into the r.atural watercourse, thence easterly to the undeveloped Wetmore Avenue. Surface water from the rough grass area south of the existing substation drains into the substation's storm system and discharges to a natural swale at the northeast corner of the substation which flows easterly through the natural vegetation to the undeveloped Wetmore Avenue. Road frontage area (rough grass and blackberries) on Scenic Drive between the substation and Grant Avenue is discharged by means of sheet-flow into the natural vegetation, thence northeasterly to the undeveloped Wetmore Avenue. i� TiT7i�9�i�Z�Ti � � � . - � . � Proposed landscaping on the south and west side of the �_ existing substation is required for Special Property Use Permit W 16-84. The rate of drainage runoff from this area will not be — increased since area is being landscaped. Some gravel surface — along the west side will be replaced by grass thus reducing the _ rate of runoff. Additioru}landscaping, which is not required by the City, is proposed on the portion of the PNT right-of-way west of the substation to Beverly Boulevard. Approximately 1900 to 1500 cu. yards of fill and topsoil will be imported to elevate the low area on the PNT to approximately street level for landscaping. Most of this proposed landscaped area will be planted with grass, shrubs, ground covers and trees. The existing open ditcY. system will be replaced by a closed storm drain system. The ra�e of drainage runoff will be reduced since most of the gravel ;;urface in this area will be replaced by landscaping. The volum: •�f detention �torage that can be reduced is calculated to be 1S2 cf. Street improvements proposed on Scenic Drive east of the substation is required by the Short Subdivision No. 99-89. The work consists of construct?.ng approximately 310 linea� feet of curb and gutter with a 5 foot wide sidewalk and all necessary drainage facilities and asphalt patching. Landscaping the street frontage behind the sidewalk is also proposed. Approximately 0.17 Ac of earth/shoulder area will be changed to impervious surface, thus the detention storage required will be 290 cf. For storage volume required being less than 250 cf, no detention will be provided for the increased rate of :unoff. - r =n= �_-: i . __i__+-�-i�---; _�__i._. i . . �... ,.. .� .... ..�-�-!- --. l ? f_-j , , , , I