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PDT 17-1
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Hearings Official Decision
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Last modified
5/16/2018 4:02:00 PM
Creation date
5/15/2018 12:02:14 PM
Metadata
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Template:
PDD_Planning_Development
File Type
PDT
File Year
17
File Sequence Number
1
Application Name
CAPITAL HILL PUD
Document Type
Decision Document
Document_Date
5/15/2018
External View
Yes
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Similar to the system proposed for Capital Drive, the applicant has proposed to collect <br />stormwater runoff from the private street into a series of underground storage facilities with <br />orifices in order to meet the flow control requirements of EC 9.6793. As shown in Tables 1 and 2 <br />of the applicant's Stormwater Management Plan and Drainage Study, runoff contributed by the <br />construction of the private street will be discharged at Discharge Sites 1, 2, and 3. For the <br />northern and southern portions of the proposed private street, runoff will be collected into <br />underground detention vaults with orifices that will reduce the peak discharge rate that are less <br />than or equal to pre-development conditions. Water will then connect into the proposed public <br />system where it will discharge at the locations identified in the Stormwater Management Plan <br />and Drainage Study. Tables 1 and 2 show that the peak discharge rate at Discharge Site 1 will be <br />less than that under existing conditions, and the peak discharge rate at Discharge Site 3 will be <br />equal to that under existing conditions, consistent with EC 9.6793(3)(a). <br />For the remaining portion of the private street, runoff will be directed into a series of <br />underground storage tanks with orifices that will reduce the peak discharge rate. Runoff will then <br />be released through level spreaders into a designated preservation area on the east side of the <br />development site. Based on existing topography, the proposed system closely mimics existing <br />runoff locations. The discharge location is identified as Discharge Site 2 in Tables 1 and 2 of the <br />applicant's Stormwater Management Plan and Drainage Study. As shown in Table 2, the peak <br />discharge rate being released out of each level spreader mimics that of the existing conditions. It <br />is noted in the report that a 38-foot wide section was used to establish the existing basin and its <br />peak discharge rate of 0.16 cubic feet per second (cfs). The proposed system includes two 38- <br />foot wide level spreaders, each being 38 feet long and each having a peak discharge rate of 0.16 <br />cfs, which matches the existing condition, and which is consistent with the flow control <br />standards outlined in EC 9.6793(3). <br />Individual Lots <br />The applicant has stated that individual lots will address flow control and water quality standards <br />when applying for building permits on a case by case basis. The flow control standards for the <br />individual lots will be addressed on a case by case basis at the time that each lot applies for a <br />building permit. <br />Based on these findings, this standard is met and will be further reviewed at the time of <br />development. <br />EC 9.6794 Stormwater Oil Control <br />This standard does not apply because the proposed development will not result in any of the <br />conditions listed under EC 9.6794(2) (a)-(d). <br />EC 9.6795 Stormwater Source Controls <br />This standard does not apply because this application will not result in any of the site uses or <br />characteristics listed under EC 9.6795(2) (a)-(h). <br />Hearings Official Decision (PDT 17-1) 75 <br />
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