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HomeMy WebLinkAboutRS_Defoor_Geomorphic_Assessment_060501.pdfMay 1,2006
Talasaea Consultants, Inc.
15020 Rear Cn:ek Road NW
Woodinville, Washington 98077
Attention: Jason Walker
Subject: Defoor Property
Geomorphic Assessment
Renton, Washington
file No. 13495-001-00
GEoENGfNEER~
INTRODUCTION
GeoEngineers, Tnc is pleased to provide this letter report summarizing the results of a geomorphic
assessment regarding drainage channels located on the Defoor Property, in Renton. Washington. This
report was requested by Jason Walker of Talasaea Consultants on April 26, 2006. The purpose of the
requested services is to qualitatively assess the geomorphic character and origin for two streams,
Stream B and Stream A, on the Property.
The project work scope consists of reviewing reports and maps provided by Talasaea C()nsultants, and
visiting the Defoor Property to observe the stream.... The Reports reviewed by GeoEngineers include:
Hydrogeological Consultation; Stream B Corridor, dated March 24, 2006 and prepared by Icicle Creck
Engineers (ICE); Coal Mine Hazard Assessment and l)rcliminary Geotechnical Evaluation, Renton Hill
Property, dated June 10, 2005, prepared by ICE; and a section of a report entitled Defoor Property ---
Wetland Study, Stream Assessment, Habitat Study, Watershed Restoration and Mitigation Plan, dated
October 3, 2005, prepared by Talasaea Consultants. GcoEngineers also reviewed the Wetland and Stream
Basin Restoration Plan, Existing Conditions and Overview Plan, dated 28 June .. 2005, prepared by
Talasaea Consultants_
OBSERVED CHANNEL CONDITIONS
The site visit was conducted on April 28, 2005. The reconnaissance included walking the length of
Streams A and B from Renton A ve So to the base of the slope just east of wetland B.
Stream A originates up-!,'Tuciient of Renton Ave S, passes through a culvert beneath the road and flows
downstream in a well defined swale with side slopes inclined from 20 to 50 percent. The swale is
reflected as a dip in Renton Ave So. The Stream A cross section dispJay au-shaped Hoor with side walls
inclined to the angle of repose of the soils.
Stream B conditions are well described in the ICE March 24 2006 report. The "stream" originates at a
culvert outfall at Renton Ave S. No observable expression of a drainage appears to extend upslope from
Renton Ave So. Thc culvert is situated on a topoh'Taphic high point on the right limb of the Stream A
swale. Immediately do\vn gradient of the culvert outfall, the stream consists of two or three deeply
incised channels with nearly vertical side walls. The channels do not reside in a topographic swale.
TaLasaca Consultants. lnc.
May 1,2006
Page 2
Roughly 125 to 150 feet down gradient from the culvert the channels merge to form a singlc channel.
The dimension of the single channcl is uncharacteristically narrow and deep, with entire sections
measuring 2 to 3 wide (top of channel) by 5 or 6 feet deep. The side walls of the single channel are
generally vertical to overhanging, giving the channel cross section a tear drop shape, narrow at the top
and wide at the basco
CONCLUSIONS
STREAM A
The morphologic character of Stream A channel and swale features indicates that it has evolved over
several thousand years. The cross sectional form of this swale is consistent with the long term adjustment
of other Puget Sound drainage systems to climate, discharge, regional gradient, hillslope soils. The long
term development of the drainage is panicularly apparent from the stability and inclination of the swale
sidewalls. These slopes are inclined back to the apparent angle of repose and well stabilized by the
growth ofmoderatcly dense deciduous trees and understory vegetation.
STREAM B
In contrast, the morphologic character of Stream B indicates that it is not a naturally fomled stream. We
abrree with the conclusion of the Mary 24th ICE report that Stream B is an erosional gully formed in direct
response to stonn water runoff (from residential development upslope of Renton Ave So) discharging
from the culvert over the period of several decades. The morphologic character of the gully is consistent
with numerous other gullies and ditches in the Puget Sound area that have formed similar gullies in
similar soils and urbanized settings.
The location of the gully is not consistent with the long term development of natural drainage channels,
which otherwise form swales. in addition, the configuration of mUltiple gullies extending downstream
from the culvert is typical of the dispersion of unmitig'dted storm water dispersing from the culvert. The
depth of the single stem gully and cross sectional shape is a direct result of the high volumes of
unmitigated (undetained) storm water runoff generated by urban development.
The gully walls appear to be highly unstable and subject to failure. The faces of the walls are near
vertical to overhanging and bear no vegetation. This characteristic indicates that the floor of the gully
may still be undergoing incision, and the channel is still adjusting to storm discharge from the point
source.
We also agree with ICE that the gully represents a public health and safety risk. The gully is obscured by
the local topography, in that there is no observable swale, and by ground cover vegetation, both of which
make it difficult to see and easy to fall into. In our opinion, the physical condition of this gully should be
modified to minimize or eliminate the risk of public injury.
LIMITATIONS
GeoEngineers has developed this report to support the geomorphic evaluation in general accordance with
the scope and limitations of our proposal. Within the limitations of scope, schedule and budget, our
services have been executed in accordance with the generally accepted practices [or slope stability
evaluations in this area at the time this report was prepared.
Filr No, 13495·00}·00 GeoENGINeeR~
aJ.asaea Consultant.s. Inc.
May 1,2006
Page 3
This report has been prepared for the exclusive usc of Talasaea Consultant, Inc and their authorized
agents. No other party may rely on the product of our services unless we agree in advance to such
reliance in writing. The information contained herein should not be applied for any purpose or project
except the one originally contemplated.
Any alteration, deletion or editing of this document without explicit ""Titten pennlSSlOn from
GeoEngineers is strictly prohibited. Any other unauthorized use of this document is prohibited. This
document is intended to be: used in its entirety. If an excerpt is quotcd or paraphrased, it must be properly
referenced.
Any electronic fonn. facsimile or hard copy of the original document (email, text, table. andlor figure), if
provided, and any attachments are only a copy of the original document. 'lbe original document is stored
by GeoEngineers and will serve as the official document of record.
Sincerely,
GeoEngineers, Inc.
.?
A:.~ /1.;
./
Mary Ann Reinhart, LG, LHG
Associate
MAR:ja
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rile ,Vo. 13495-001-(}{)
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(J9TALASAEA
CONSULTANTS, INC.
Resource Be Environmental Plannin,
15020 Bear Creek Road Northeast
Woodinville. Washington 98077
Bus (425)661-7550 -Fax (425)861-7549
--
EXHIBIT -FIGURE I
VICINITY MAP
DEFOOR PROPERTY
RENTON, WA
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5/1/06
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sire PLAN PROVIDB:1 6'1' GORE DE51eN, 14111 NE
2<lTll PL. suire 101, 6ELLEWE. I!VI Q!lOO1
(425)005-1&11.
2. 5G\JRGE DRAHN5 IAAS MroIFIB:1 BY T ALASAEA
CON5UI..TANT5 FOR VISUAL EI+lANG&lENT.
eTALASAEA
CONSULTANTS, INC.
Rellource & Environmental Planning
15020 Bear Creek Road Northeasl
Woodinville, Washington 98077
Bus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FI6URE 2
DESIGN
EXISTIN6 CONDITIONS FOR SCALE
OVERALL SITE a WETLAND ENLAR6EMENT AS NOTED
DEFOOR PROPERTY DATE
RENTON, WA 5/1/06
REVISED
PROJECT
<131
© Copyright -Talasaea Consultants, INC.
---------------~--E:~r~lff~~----
8UILDING
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NOTES
511'1: PLAA PROVID8:) BY CORE DESlc;N. 141" IE
2'111-1 PL. SUITE 101, BELLEWE, IAA <15001
(4:25}MS-1&11.
2. ~E DRAHNtSlAA5 MODIFl8:) BY TALA5AEA
c:.otat. T,AIoIT5 FOR Vl5UAL EI+lAIte1ENT.
@TALASAEA
CONSULTANTS, INC.
Rellource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville. Washington 98077
Bus (425)881-7550 -Fax (425)881-7549
EXHIBIT _ FIGURE 3
STREAM B
DEFOOR PROPERTY
RENTON, WA
DESIGN
SCALE
AS NOTED
DATE
5/1/06
REVISED
PROJECT
<131
© Copyright -Talasaea Consultants, INC.
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CONSULTANTS, INC.
Resource & Environmental Planning
15020 Ilear Creek Road Northeast
Woodinville, Washington 98077
Ilus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE 4
STREAM B SECTION
DEFOOR PROPERTY
RENTON, WA
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DESIGN
SCALE
AS NOTED
DATE
5/1/06
REVISED
6 1
PROJECT
Cl31
© CopyrIght -TaIasaea Consultants, INC,
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(9TALASAEA
CONSULTANTS, INC.
Reeource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville. Washington 98077
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IDTALASAEA
CONSULTANTS, INC.
Re!!ource & Environmenlal Planning
15020 Bear Creek Road Northeast
Woodinville, Washington 98077
BUB (425)861-7550 -Fax (425)861-7549
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STREAM A
DEFOOR PROPERTY
RENTON, rlA
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DESIGN
SCALE
AS NOTED
DATE
5/1/06
REVISED
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PROJECT
ct31
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<5RAPHIC. SCALE CD (IN FEET1-, , ,
,-I tl I :1 4 o eTALASAEA
CONSULTANTS, INC.
Rel!ource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville. Washington 98077
Bus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE 1
STREAM A SECTION
DEFOOR PROPERTY
RENTON, HA
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NATIVE FOREST UNDERSTORY
SCALE
AS NOTED
DATE
5/1/06
REVISED
PROJECT
'131
© Copyright -Talasaea Consultants, INC.
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PL.ANTINS PL.AN
rn GRAPHIC SCALE GDNOR ( IN FEET)
I I t I o 15 30 60
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e TALASAEA
CONSULTANTS, INC.
Resource & Environmental Planning
15020 Bear" rreek Road Northeast
Woodirn-ille, Washiugton 98077
Bus (.125)861-7550 -Fax (425)861-7519
STREAMB
----
PROVIDE HILlOW FA5c.itEs~'
AT STREAM BANKS,
(SEE DETAIL B AND BA ON 5I£Et 1.1) •
LIMIT OF GLEARIN5'-.2.,
(APPROXIMATE ED6E OF' '
EXI5TIN6 VEGETATION TO
REMAIN)
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EXHIBIT FIGURE 8
PLANTING PLAN
DEFOOR PROPERTY
RENTON, HA
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SCALE
AS NOTED
DATE
5/1/06
REVISED
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© Copyright -Talasaea ConslIlt.anls, INC.
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PI-ANT SCHE:DUI-E:
TREES
SYMBOL SCIENnFIC NAME
1il2\.":'" V ~ A(;ER CIRCINAn.t1
@~ FRAXlttIS LAn FOLIA
~--RHAHHJ5 AJRSHIANA
~ .. --PICEA SITCHENSIS
a. ~. --PlttIS CONTORTA
V" -----THUJA PlICATA
®----THUJAPlICATA
SHRUBS
SYMBOL SCIENTIFIC NAME
0-CORIV5 SERICEA
®---MAHONIA AGlJIFOLIUM
COMMON NAME
VINE MAPlE
OREeoNASH
CAScARA
SITKA 5PR1JC.E
SHORE PINE
HESTERN RED CEDAR
HESTERN RED CEDAR
COMMON NAME
RED-05IER D06HOOD
0REe0N 6RAPE
H.. STAI1J5 SPA(;IN6 Glrr. SIZE (MINJ NOTES
FA(;-AS StIC>Yf.I 4 3' HT. t-U.TI-STEM (3 MINJ
FA(;H AS SHOHN 5 5-6' HT. SIN6LE ~ HELL tlRANCHED
FA(; AS SHOHN 5 4' HT. B4B, RJLL I BUSHY
FA(; AS SHOHN 10 2-3' HT. B. B, RJLL • BUSHY
FA(; AS SHOI+I 4 4-5' HT. B. B, RJLL • ElUSHY
FA(; AS SHOHN 2 4-5' HT. B4 B, RJLL • BUSHY
FA(; AS SHOHN q 2-3' HT. BI B, RJLL • BUSHY
H.. STAT1J5 SPA(;IN5 Glrr. SIZE (MIN) NOTES
FA(;H 3' O.C. Isq I~· HT. t-U. TI-GANE (3 MINJ
NL 3'0.C. 135 I~· HT. R.U. • ElUSHY
@--.. SALIX LASIANDRA PA(;IFIC HILLOH FACH 3/sYMBOL 4 4' ClITTIN6 ~r;';~E5OBTAINED FROM ON-5ITE CLEARIN5
0------. SALIX SCOULERIANA SCOULER HILLOH FA(; 3/SYMBOL 3M 4' ClITTIN6 HALF INCH DIAMETER, BARK INTACT
SYHPHORICARPOS ALaJ5 COMMON 5NOIoeERRY FAOJ 3'0.C. 140 I~· HT. I'tJLTI-GANE (3 MINJ
EROSION CONTROL SEED MIX (PROVIDE AT ALL EXPOSED SOIL. A1>J:AS)
SCIENnFIC NAME COMMON NAME H.. STAT1J5 SPACIN6
FE5 T1JCA RlJBRA
A6R0Sns TEltJIS
RED FESCUE FA(;. SOlI> APPLICATION RATE PER ACRE,
COLONIAL BENT6RASS FA(; SOlI> 400 SEED MIX
1201 HILBUR aLis FERTILIZER, 5-10-10 50.\1 IBRI, OR EGlUIV.
r
STALASAEA
CONSULTANTS, INC.
Resource & Environmental Planning
15020 neal" Creek Road Northeast
Woodin\'ille, Washington 98077
BIIS 1·125)8GI-7G50 -Fax 1·125)B61-75~9
EXHIBIT FIGURE <1
PLANT LEGEND
DEFOOR PROPERTY
RENTON, WA
DESIGN J DRAWN
CL
SCALE
AS NOTED
DATE
5/1/06
REVISED
""
J PROJECT
<131
~
© Copyright -Talasaea Consult ants, INC'.
eTALASAEA
CONSULTANTS, INC.
Rel!ource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinvllle, Washington 98077
Bus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE 10
PHOTO #10, STREAM B CORRIDOR
DEFOOR PROPERTY
RENTON, WA
SCALE
N.T,S,
DATE
5/1/06
REVISED
© Copyright -TaIasaea Consultants, INC.
mTALASAEA
CONSULTANTS, INC.
Resource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville, Washington 98077
Bus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE II
PHOTO #11, INCISED STREAM B CHANNEL
DEFOOR PROPERTY
RENTON, riA
SCALE
N.T,S,
DATE
5/1/06
REVISED
© Copyright -Talasaea Consultants. INC,
IDTALASAEA
CONSULTANTS, INC.
Resource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville, Washington 98077
BUB (425)661-7550 -Fax (425)861-7549
EXHIBIT _ FI6URE 13
PHOTO #13, CULVERT AT RENTON AVE S.
DEFOOR PROPERTY
RENTON, iI'IA
SCALE
N.T.s.
DATE
5/1/06
REVISED
© Copyright -Talasaea Consultants, INC.
{j9TALASAEA
CONSULTANTS, INC.
Resource Be Environmental Planning
15020 Bear Creek Road Northeast
Woodinville, Washington 98077
Bus (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE 13
PHOTO ltl4, STREAM B CHANNEL
DEFOOR PROPERTY
RENTON, /AlA
SCALE
N.T's,
DATE
5/1/06
REVISED
© Copyright -TaIasaea Consultants, INC,
eTALASAEA
CONSULTANTS, INC.
Resource & Environmental Planning
15020 Bear Creek Road Northeast
Woodinville, Washington 98077
BUB (425)861-7550 -Fax (425)861-7549
EXHIBIT _ FIGURE 15
PHOTO #15, STREAM A CORRIDOR
DEFOOR PROPERTY
RENTON, WA
SCALE
N.T's.
DATE
5/1/06
REVISED
© Copyright -Talasaea Consultants. INC'.