HomeMy WebLinkAbout25_Wetland-Assessment
May 21, 2016
AOA-5175
Stein Skattum
skattum@comcast.net
SUBJECT: Wetland and Stream Reconnaissance for:
17018 and 17022 - 106th Ave. SE, Renton, WA
Parcels 008700-0265 and -0270
Dear Stein:
On May 19, 2016 I conducted a wetland and stream reconnaissance 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). No wetlands or streams are mapped on the City of
Renton mapping and no wetlands or streams were identified on or adjacent to the
property during the field investigation.
Each of the two parcels are currently developed with a single-family residence and
associated lawn and maintained yard areas. Scattered trees including Douglas fir
(Pseudotsuga menziesii), big-leaf maple (Acer macrophyllum), western red cedar
(Thuja plicata), and black cottonwood (Populus trichocarpa) were observed
throughout both lots. An upland forested area is located off-site to the east. This
off-site area was dominated by big-leaf maple, Indian plum (Oemleria cerasiformis),
vine maple (Acer circinatum), bracken fern (Pteridium aquilinum), trailing blackberry
(Rubus ursinus), and sword fern (Polystichum munitum). No hydrophytic plant
communities were observed on or adjacent to the property.
Borings taken throughout the two parcels revealed high chroma, dry, non-hydric,
soils and there was no evidence of ponding or prolonged soil saturation anywhere
on the property.
Stein Skattum
May 21, 2016
Page 2
Ditch
During the field investigation, a small (~1-foot wide) ditch was observed along the
east and south property lines of the site (Figure 1). Stormwater runoff from an off-
site development to the northeast is collected in a vault and the overflow is
discharged from a pipe at the NE corner of the 17018 residence. Intermittent runoff
within the ditch then drains south and west before entering the roadside ditch
adjacent the east side of 106th Ave. SE.
A slight flow was observed discharging from the off-site vault at the time of the site
visit. This runoff was observed infiltrating within the ditch near the southeast corner
of the 17018 residence and the remainder of the ditch was dry.
Since the ditch: 1) conveys entirely artificially collected stormwater runoff and 2) was
cut through an upland where no stream previously existed, the ditch should not be
considered a stream by the City of Renton or any other regulatory jurisdiction.
Conclusion
No wetlands or streams were identified on or immediately adjacent the site. This
determination is based on a field investigation during which no hydrophytic plant
communities, hydric soils, or evidence of wetland hydrology were observed.
If you have any questions regarding the reconnaissance, please give me a call.
Sincerely,
ALTMANN OLIVER ASSOCIATES, LLC
John Altmann
Ecologist
King County, Pictometry International Corp., King County
Figure 1
Date: 5/21/2016 Notes:
±The information included on this map has been compiled by King County staff from a variety of sources and is subject to changewithout notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness,or rights to the use of such information. This document is not intended for use as a survey product. King County shall not be liablefor any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profitsresulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map isprohibited except by written permission of King County.