91-101861CfrY OF
33530 1ST WAY SOUTH
December 30, 1998
Mr. John Altmann
Talasaea Consultants
15020 Bear Creek Road NE
Woodinville, WA 98072
Re: Fall 1998 Lake #1 Monitoring Report
Dear Mr. Altmann:
(206) 661-4000
FEDERAL WAY, WA 98003-6210
CORRESPONDENCE
I have reviewed the above referenced report received December 21, 1998, and concur with your
findings. All previously recommended maintenance items appear to have been successful or
ongoing. There does not appear to be any additional maintenance required beyond that presently
occurring at this time. I look forward to receiving the final 1999 spring and fall monitoring
reports.
If you have any questions, please give me a call at (253) 661-4108.
Sincerely,
Greg Fewins
Principal Planner VVV
L:\PRMSYS\DOCLTN ENT\SEP91 00.01\PL 123098 DOC
TA LASA EA
CONSULTANTS
Resource '&? Environmental Planning
15020 Bear Creek Road Northeast • Woodinville. Washington 98072
Bus: (425) 861-7550 • Fax: (425) 861-7549
TO: C- I `f Or- F�7�,2h� WAY
3>S30 ish wk� soiTa1
F t'OC t�L&U GJ A Y W o�
Attn:
Date:
Subject:
LETTER OF
TRANSMITTAL
I)CC.i4�
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Project Number:
From: J_c N 1�
Transmitting Herewith: The Following: For:
Proposal
Contract
No. of Copies: L _ Change Order Sets X
Letter
Sheets Report
Prints or Drawings
Specifications
Other
Description of Materials:
L o N [,-T612-wn moil Trott-. nt
Txt--1'�0
Review & Comment
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Signature
Your Use & Files
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As Requested
Action Noted Below
1 WLS 1 CAWf J5
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7L� c�SE CALL t'✓t-iN QuC:-5-Vk
Copy To:
Sin ere Yours, C
J�r
10, q $
TA SSA EA Consultamitr A KilTv �F ELCPMENT DEPARTMENT
DEC ? 1 1999
'I
TA LASA EA
CONSULTANTS
December 17, 1998
TAL-190
r Mr. Greg Fewins, Senior Environmental Planner
l Department of Community Development
City of Federal Way
j 33530 1 st Way South
Federal Way, WA 98003
-1 REFERENCE: Long-term Monitoring of Lake 1, West Campus (1998)
�j Dear Greg:
J This letter summarizes the environmental conditions following the fourth year of long-
term monitoring of Lake 1 in the West Campus area of Federal Way, WA. Field
investigations were conducted on June 30 and October 21, 1998 to document the
environmental conditions at the same four sampling transects which were
1 established prior to construction (see Figure 1 and refer to pre -construction
1 assessment report dated July 5, 1994). This monitoring was conducted as part of
the requirements of the approved April 27, 1994 Monitoring Plan. Conditions at the
lake are now being compared to the conditions that existed prior to construction of
�f the stormwater improvements.
1 General Overview
1 The water level within the lake during the 1998 field investigations was considerably
lower than during the 1997 monitoring events. The water level during the June 1998
site visit was about two feet lower than during the June 1997 site visit, and the water
level during the fail 1998 site visit was about five feet lower than during the fall 1997
site visit. This drop in water level is probably attributable to variability in precipitation
from year to year and confirms that water level fluctuations within the lake are
relatively high.
At the time of the 1998 field investigations, the water level of the lake corresponded
roughly to the lower edge of the transition zone which separates the dense Pacific
and Sitka willow strip from the upland forest. For the purpose of this report, the
Jtransition zone is defined as the area between the upper portion of the willow strip
(which corresponds roughly to the ordinary low water edge) and the elevation at the
outlet weir (static water surface elevation of 275').
i
J
Resource '�2 Environmental Planning
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1 Mr. Greg Fewins
December 17, 1998
Page 2
Vegetation in the transition zone continues to be dominated by black cottonwood,
1 red alder, Douglas' spirea, and willow. Similar to 1997 conditions, several black
cottonwood and red alder trees in the transition zone have died or are stressed
(apparently as a result of rising water levels). However, it does not appear that a
-� significant change in the overall plant community has occurred since the pre -
construction period.
�l The area upland of the transition zone continues to be dominated largely by Douglas
fir and salal. As noted during the fall 1997 field investigation, several Douglas fir
trees appear to have died as a result of rising water levels along the upper edge of
�l the transition zone. As previously reported, the death of these trees does not appear
1 to have compromised the functional value of the lake buffer, since a dense terrestrial
buffer still exists between the high -water -line of the lake and the adjacent
�] development. Furthermore, those trees which have died along the lake edge
continue to provide valuable wildlife habitat features (i.e., snags and down logs).
Wildlife
The following wildlife species were observed during the 1998 field investigations:
American crow, song sparrow, black -capped chickadee, spotted towhee, American
1 robin, cedar waxwing, hairy woodpecker, kinglet (?), Canada goose, great blue
heron, red-tailed hawk, and Pacific chorus frog. Due to the seasonality and secretive
nature of most wildlife species, direct observation of wildlife is often difficult.
` Therefore, a much wider variety of species could be expected to utilize the site than
were actually observed during the field investigations.
J
_J
Vegetation Transects
The four vegetation transects which were established prior to construction were
evaluated during the 1998 monitoring events (Figure 1). Each transect consists of
two approximately 10-foot-radius sampling plots: one in the transition zone, and the
other within the upland forest just above the transition zone. Vegetation was
compared to the baseline conditions to identify any impacts to plant communities that
may have occurred due to potentially higher average water levels. For comparison
purposes, photographs taken at the vegetative sampling plots during the 1998 field
investigations are included as Attachment 1 to this report.
The comparison made within the plant communities between baseline conditions and
post -development conditions did not reveal that any significant change had occurred
as a result of possible rising water levels. This was generally expected, since full
build -out of the entire drainage basin has not yet occurred, and stormwater
contributions from these areas has yet to reach design flow rates into Lake 1. In
addition, much of the vegetation surrounding the lake has apparently become
adapted to seasonal fluctuating water levels.
Mr. Greg Fewins
December 17, 1998
Page 3
Maintenance
It was noted during the 1998 field investigations that the Scot's broom that was
dominant between the lake and the outfall wall adjacent to the Senior Center has
been removed. Much of the original planted vegetation in this area (especially the
rose) appears to have survived, and natural recolonization of the area by native
species is occurring. Maintenance of the planted area east of the outfall wall
continues to be ongoing, and has resulted in the successful establishment of the
intended plant community.
Summary
j The comparison made within the plant communities between baseline conditions and
l post -development conditions still did not reveal that any significant change had
occurred as a result of possible rising water levels. As previously reported, the plant
1 communities adjacent to the lake generally do not appear to have experienced a
J significant mortality rate increase. This was generally expected, since full build -out
of the entire drainage basin has not yet occurred, and maximum stormwater
elevations in the lake have not yet been reached.
Monitoring on the site will continue until the fall of 1999, pursuant to the terms and
1 conditions of Talasaea's contract with the City of Federal Way. The next long-term
monitoring event will be conducted in the spring of 1999, and a final report will be
prepared following the fall of 1999 field investigation. Should you have any
questions concerning the monitoring program for this site, please call me at (425)
861-7550.
Sincerely,
TALASAEA CONSULTANTS
Jo Altmann
Ecologist
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wall/dam ranging from two to eight feet high, approximately 400 with spillway,
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