Edmonds Civic Center Groundwater Monitoring Memorandum 9.4.2020 (2)BLD2019-1590 RESU B
LANDAU Nov 04 2020
CITY OF EDMONDS
ASSOCIATE D PARTMENRVICES
September 4, 2020
Walker Macy
111 SW Oak St, Suite 200
Portland, OR 97204
Attn: Ms. Andrea Kuns, ASLA, Senior Associate
Transmitted via email to: akuns@WalkerMacy.com
Re: Summary of Wet Season Groundwater Monitoring
Civic Center Playfield Improvements
Edmonds, Washington
LAI Project No. 1548002.010.011
Dear Ms. Kuns:
This memorandum summarizes the results of groundwater monitoring completed by Landau
Associates, Inc. (LAI) in support of the Civic Center Playfield Improvements project, located at 598
Edmonds Street in Edmonds, Washington (site; Figure 1).
Project Understanding
LAI's project understanding is based on information provided by the City of Edmonds (City;
project owner) and Walker Macy (project architect). The City plans to improve the existing Civic
Center Playfield by adding a restroom and concession building, a shade pavilion, athletic courts
and field, a water feature, a playground, a skate park, a scramble wall, view terraces, walkways,
and stormwater infiltration facilities.
To facilitate design of the proposed stormwater management systems, LAI monitored
groundwater elevations at the site during the 2018-2020 wet seasons. Services were provided in
accordance with the scope outlined in the Standard Form of Agreement between Architect
(Walker Macy) and Consultant (LAI), dated April 24, 2017.
Groundwater Observations
During an earlier phase of the project, LAI installed monitoring wells in borings B-5 and B-6. The
approximate locations of the borings are shown on Figure 2. LAI installed Solinst° leveloggers in
both monitoring wells to measure and log semi -continuous groundwater levels at the site.
Additionally, a Solinst barologger was installed in a dry, sheltered area of the site to measure and
log changes in atmospheric pressure. Barologger data were used to compensate the water and
130 2nd Avenue South • Edmonds, Washington 98020 • (425) 778-0907 • www.landauinc.com
Civic Center Playfield Improvements
RESUB
Landau AssociateNov 04 2020
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
atmospheric pressure measurements recorded by the leveloggers. The compensated water
pressure measurements were then converted to water level -equivalent measurements.
Site groundwater levels were initially logged between October 24, 2018 and March 19, 2019.
Subsequently, groundwater levels were logged between September 30, 2019 and May 4, 2020. An
equipment malfunction during the 2018-2019 wet season resulted in an incomplete set of
groundwater data. LAI replaced the leveloggers and barologger before the 2019-2020 wet
season.
During the 2019-2020 wet season, the leveloggers measured and logged groundwater levels at 2-
hour intervals. Between late September 2019 and early May 2020, LAI personnel manually
measured groundwater levels on or around the first of each month. LAI's manual water -level
measurements for the 2019-2020 wet season are presented in the following table. The
compensated water levels are presented on Figure 3 along with precipitation data from the
National Oceanic and Atmospheric Administration Weather Forecast Office Seattle Station.
Depth to Groundwater
(ft bgs)
Location
of Manual 9/30/2019 11/1/2019 12/2/2019 1/2/2020 2/3/2020 3/3/2020 3/31/2020 5/4/2020
Reading
B-5 4.2 4 3.8 3 3 2.9 3.1 3.36
B-6 2.8 3.75 2.8 2.5 2.75 3 3 3.09
bgs = below ground surface
ft = feet
Use of This Memorandum
Landau Associates has prepared this wet season groundwater monitoring memorandum for the
exclusive use of Walker Macy and the City of Edmonds for specific application to the Civic Center
Playfield Improvements project in Edmonds, Washington. No other party is entitled to rely on the
information, conclusions, and recommendations included in this document without the express
written consent of Landau Associates. Reuse of the information, conclusions, and
recommendations provided herein for extensions of the project or for any other project, without
review and authorization by Landau Associates, shall be at the user's sole risk. Landau Associates
warrants that, within the limitations of scope, schedule, and budget, its services have been
provided in a manner consistent with that level of care and skil I ordinarily exercised by members
of the profession currently practicing in the same locality under similar conditions as this project.
Landau Associates makes no other warranty, either express or implied.
September 4, 2020 2
Civic Center Playfield Improvements
RESUB
LandauAssociate9VOV 04 2020
— CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Closing
If you have questions, or if additional information is required, please contact the undersigned at
(425) 329-0251.
LANDAU ASSOCIATES, INC.
Sean M. Gertz, PE
Senior Project Engineer
sy� w�4
Steven R. Wright, PE
Principal
BCS/SMG/SZW/mcs
[P:\1548\002\R\GROUNDWATER MONITORING MEMO\EDMONDS CIVIC CENTER GROUNDWATER MONITORING MEMORANDUM 9.4.2020.DOCX]
Attachments: Figure 1. Vicinity Map
Figure 2. Site and Exploration Plan
Figure 3. Groundwater Level Readings: September 2019—May 2020
September 4, 2020 3
Puget Sound
I
Gaspers St�
Project Location =
>
a
Mta ��P I
P,F t
♦+
ON
Main St
I
I
N 0 0.5 1
Miles
Data Source: Esri 2012
Civic Center
LANDAU Playfield Improvements
ASSOCIATES Edmonds, Washington
l
RESUB
NOTM 2020
rD�vVCFIITY OF E MONDS
Snoho nyfifELOPMEN SERVICES
DEPART ENT
County
Park
f .
Esperance
ti i
Seattle Spokane
Tacoma
Ilympia
Washington
Vicinity Map
Figure
1
RESUB
OH— OHS OH -
I I
q
I .
I
----------------------------�
2020
CI+Y OF ED ONDS
EVE40PMEN SERVICES
DEPART ENT
I I I
I j I
Jww Q I
Legend
B-1 Boring Location and Designation
TP-1 Test Pit Location and Designation
Basemap source: KPFF Land Surve)
Civic Center
LANDAU Playfield Improvements
ASSOCIATES Edmonds, Washington
Bell —._._._.—.—....
{
0 150 300
Scale in Feet
rs September 2017
Figure
Site & Exploration Plan 2
RESUB
Nov 04 2020
0 14/4U rreUrnUaraU I rprojeas\ 1046rUU4nMuruunuwaler rvronuonny vieuiwrua 4u i a - 4u4u vvv Uara.000X
DEVELOPMENT SERVICES
DEPARTMENT
N C, I F N N N N N
l0 F-' O O FA A
\ O \ \ \ F-� \ \ \ IVl IV \ \ \ F-� \ \ \ I� \ \ \ W W \ \ \ A \ \ \ (/1
W \ I--' fV 00 \ I--' 00 r1jUn \ \ I--' W W \ W 0 fJ \ 0 I--' fJ \ \ I--' W W \ W 0 -4 \
O V A I--� 00 A F-� 00 U'I fV lD Ol W O Ol W O V W O V A fJ l0 Ol W O Ol W O V A
\ \ \ \ \ III\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ILD W W ILD LID W W W LD W ILD W W W 0 0 CD r1jC fv fv fv fv fv fJ fJ Ili0 0 0 0 0 CD CD
lO lO lO lO � lD lD lD l0 lD lD lD lD lD O O O O O O O O O O O O O O O O O O
0.0 6
5.5
too 2.0 5LO
�
L
4.5
4.0 4 •�
3.5 i
6.0 3
fV
0
2.5
0 8.0 2
1.5
I?
0 10.0 1
0.5
I
12.0 0
13-5 Water Level B-6 Water Level Rainfall
Notes
1) Water level data were collected from monitoring wells installed in borings B-5 and B-6 and have been converted to depth -to -
water, relative to ground surface.
2) Precipitation data are from the National Oceanic and Atmospheric Administration Weather Forecast Office Seattle Station.
Civic Center Playfield Improvements Groundwater Level Readings: Figure
LANDAU Edmonds, Washington September 2019—May 2020 3
ASSOCIATES
W_ -IV