HomeMy WebLinkAboutRS_Stream Delineation_161130_v1 November 30, 2016
AOA-5029
Jim Dalpay
Dalpay Properties LLC
4033 NE Sunset Boulevard
Renton, WA 98059
SUBJECT: Standard Stream Study Delineation for Dalpay Short Plat
Parcel 042305-9032, Renton, WA
Dear Jim:
On December 14, 2015 a wetland and stream reconnaissance was conducted on
the subject property utilizing the methodology outlined in the May 2010 Regional
Supplement to the Corps of Engineers Wetland Delineation Manual: Western
Mountains, Valleys, and Coast Region (Version 2.0). One stream (Stream 1) was
identified and delineated within a small ravine that traverses the central portion of
the property. No wetlands were identified on the site.
Stream 1
Stream 1 is a tributary to Honey Creek, which is identified as a Type Np stream per
the City of Renton (COR) mapping. The stream on the subject property is not
mapped on the COR mapping.
Stream 1 drains from north to south through a ravine dominated by a coniferous
forest that includes Douglas fir (Pseudotsuga menziesii), western red cedar (Thuja
plicata), Oregon grape (Mahonia sp.), holly (Ilex sp.), Himalayan blackberry (Rubus
armeniacus), sword fern (Polystichum munitum), and English ivy (Hedera helix).
Stream 1 was identified as a Class 4 stream as part of a previous short plat
associated with the subject property. As part of the previous application, Stream 1
and the adjacent slopes were placed within a Native Growth Protection Easement
(Recording No. 20050927003163). It is my understanding that the stream dries out
during the summer months and would therefore be considered a Type Ns stream per
the current City of Renton classification system.
Jim Dalpay
November 30, 2016
Page 2
City of Renton Mapping
The new stream delineation has been surveyed and is depicted on the survey
drawing. Type Ns streams in the City of Renton currently require a standard 50-foot
buffer plus 15-foot building setback from the ordinary high water of the stream
adjacent new development per RMC 4-3-050.G.2 (Figure 1). When a required
stream buffer falls within a protected slope or very high landslide hazard area, the
stream buffer width must extend to the boundary of the protected slope or very high
landslide hazard area (as determined by the geotechnical consultant).
Proposed Project
The proposed project consists of a 4-lot Short Plat. Access to the 3 new lots (Lots 2-
4) in the southeast portion of the site would be from Redmond Court NE to the east.
It is my understanding that the development footprint on Lot 1 in the northwest
portion of the property is vested to the NGPE easement boundary per the previous
short plat and is therefore not subject to the current critical area buffer requirements.
Jim Dalpay
November 30, 2016
Page 3
It is my recommendation that this vesting of the NGPE boundary associated with Lot
1 be confirmed prior to further detailed site planning.
If you have any questions regarding the delineation of classification of the stream,
please give me a call.
Sincerely,
ALTMANN OLIVER ASSOCIATES, LLC
John Altmann
Ecologist
Attachments
PROJECT DRAWN DATE SCALE REVISED Landscape Architecture AOA Environmental Planning &Office (425) 333-4535 PO Box 578Carnation, WA 98014Fax (425) 333-4509 Altmann Oliver Associates, LLC 5029-MIT-11-30-16.dwg
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