BLD2022-0462+Applicant_Response+6.3.2022_5.15.46_PM+2911890LSyner RECEIVED
gy 6/3/2022
CONSTRUCTION, INC.
F EDM
June 3, 2022 C EITYVELOPMON DS
SERVICES DEPARTMENT
To: Jennifer Lambert Oennifer.lambert@edmondswa.gov)
Christina Barson (christina.barson@edmondswa.gov)
From: David Cohanim (david@synergyconstruction.com)
Re: Application #: BLD2022-0462
Project: Fill/Grade — Contaminated Soils
Project Address: 23625 84th Ave W
This message and supporting documents are provided in response to Plan Review Comments from City of
Edmonds Engineering Division, requesting additional information, corrections, and clarifications
regarding this project. Requests and responses follow.
1) Show a Haul Route to and from the Site. Please note that left turns onto Highway 99
from 2361 St SW will not be permitted.
Response: A map indicating the Haul Route to and from the Site has been provided.
2) Provide a Dewatering Plan for the site.
Response: A Dewatering Site Plan and comments have been provided.
3) Provide a profile showing that the excavation will not impact neighboring sites and
structures.
Response: An excavation profile has been provided, along with a narrative description from the
Project Engineer.
4) Provide a TESC and Final Restoration Plan.
The above referenced Dewatering Site Plan includes details regarding erosion control. The site
will be restored by filling the excavated site with uncontaminated soil, and surface grading to
bring the site level to its surrounding soil.
Dewatering Layout/Erosion Control Notes
Permit Application No. BDL2022-0462
23625 84th Avenue West, Edmonds
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238th Street Southwest
NOTES: Water will be pumped from excavation and conveyed to storage tank using HDPE or PVC pipe.
Water will be transported off site for recycling/treatment at fully -permitted facility located in Seattle.
Erosion control will consist of visgqueen sheeting for stockpile(s) and CB inserts
= See Figure 2
= Test probes in vicinity of Remedial Excavation Site by RGI, 02/22
= Approximate Property boundary
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Approximate Scale: 1"= 50'
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0 25 50
100 N
Corporate Office
17522 Bothell Way Northeast
Bothell, Washington 98011
Phone: 425.415.0551
IILEY Fax: 425.415.0311
Edmonds Terrace Development
Figure 1
RGI Project Number:
2021-847-2
Dewatering Erosion Site Plan
Date Drawn:
06/2022
Address: 23625 84th Avenue West, Edmonds, Washington 98026
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RILEYGROUP
June 1, 2022
Liu Brothers LLC
1641 Evergreen Point Road
Medina, Washington 98039
clo Lobsong Dargey — Anandacom
Subject: Response to City of Edmonds Comments
Terrace Place Edmonds
23625 84th Avenue West
Edmonds, Washington 98026
RGI Project No. 2021-847-2
References: Geotechnical Report, prepared by The Riley Group, Inc. dated April 12, 2022
Review Comments, prepared by City of Edmonds dated May 24, 2022
Dear Mr. Dargey:
As requested, The Riley Group, Inc. (RGI) has evaluated the impact to the neighboring property
and provided response to Comment #3.
Comment #3. Provide a profile showing that the excavation will not impact the neighboring sites
and structures.
RGI Response: The proposed remediation excavation is about 10 feet from the property line and
14 feet from the building. The maximum depth of the excavation will be about 15 feet deep and
most of the excavation will be in very dense glacial till.
The bottom of the excavation will be above the projected 45 degree line from the building
foundation. Therefore, the proposed remediation excavation will not affect the neighboring
building. When the excavation extends to the bottom 5 feet, it will be below the projected 45
degree line from the property line. Since the native soil is very dense and the excavation will last
very short time, RGI doesn't believe that it will have any impact to the stability of the property.
We trust the information presented is sufficient for your current needs. If you have any questions
regarding this letter report or require additional information, please call us at (425) 415-0551.
Sincerely,
THE RILEY GROUP, IN(
Ricky R. Wang, PhD
Principal Engineer
Attachment: Excavation Profile
Corporate Office
17522 Bothell Way Northeast
Bothell, Washington 98011
Phone 425.415.0551 4 Fox 425.415.0311
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www.riley-group.com
2-Story
Commercial P.L.
Building
Concrete slab -
on -grade
IT
Footing
ND
350 ug/L \
Surcharge Zone
Looking North
Grass
TP6A
51 Clean Soil Overburden
—, __[ — — L
17.5' bgsl
17.5' bgs \ 20'
45'
Pybu ppm
170,000 u
P.L.
6'
Depth to
Groundwater
15'
Depth to Remedial
Excavation
= Remedial Excavation & Dewatering
Diesel -range total
Petroleum Hydrocarbon
Contaminated Soil & Perched Groundwater
m (in blue) = Diesel Soil concentration (mg/kg)
♦ (in red) = Diesel groundwater concentration (ug/L)
ND = Not detected at the analytical laboratory Practical Quantification Limit (PQL)
Approximate Scale: 1"= 10'
0 5 10
20 N
Corporate Office
Edmonds Terrace Development
Figure 2
17522 Bothell Way Northeast
Bothell, Washington 98011
Phone: 425.415.0551
RGI Project Number:
2021-847-2
Cross -Section A -A'
Date Drawn:
06/2022
ILEY
Fax: 425.415.0311
Address: 23625 84th Avenue West, Edmonds, Washington 98026