20101105073103416.pdfNovember 2, 2010
Ms. Jeanie McConnell
City of Edmonds
Public Works Department, Engineering Division
121 5th Avenue North
Edmonds, Washington 98020
RE: RIGHT-OF-WAY CONSTRUCTION PERMIT APPLICATION
OLD MILLTOWN PROPERTY - 2015" AVENUE SOUTH
EDMONDS, WASHINGTON 98020
FARALLON PN: 721-003
Dear Ms. McConnell:
Farallon Consulting, L.L.C. (Farallon) has prepared this letter to summarize the scope of work
that will be conducted in the right-of-way on the northeast corner of the intersection of 5th
Avenue South and Maple Street related to the Old Milltown Property at 201 5th Avenue South in
Edmonds, Washington (herein referred to as the Site) (Figure 1). Previous investigations at the
Site have confirmed the release of petroleum hydrocarbons to soil and groundwater from
suspected source areas on the Site. Farallon conducted a geophysical survey of a suspected
underground storage tank (UST) proximate to the southwest corner of the Site on September 20,
2010. The results of the geophysical survey identified two subsurface anomalies that may
represent potential USTs located proximate to the southwest corner of the Site (Figure 2). The
purpose of the scope of work described below is to further investigate and evaluate the two
geophysical .anomalies for the potential presence of USTs to support development and
implementation of a permanent cleanup action for the Site.
The scope of work includes evaluation of the two geophysical anomalies for the potential
presence of USTs proximate to the southwest corner of the Site by advancing three air -knife
borings. The location and rationale for the borings are as follows:
Two borings will be advanced in the sidewalk proximate to the geophysical anomaly
identified on the north side of Maple Street to assess the potential presence of a UST; and
EAProjects1721 Cascade Bank1721003 Old Milltown Property\Workinp PoldcrTity of Edmonds Permit App Ltr_docx
City of Edmonds
November 2, 2010
Page 2
0 One boring will be advanced in the sidewalk proximate to the geophysical anomaly
identified on the east side of 5"' Avenue South to assess the potential presence of a UST.
Traffic control plans for each of the locations are provided as an attachment, Prior to conducting
the subsurface investigation activities, Farallon will retain both public and private utility locating
services to clear each boring location and provide additional information pertaining to the
locations of subsurface utilities at the Site. Preliminary boring locations are depicted on Figure
2. Each boring will be advanced to a depth of approximately 8 feet below ground surface using
air -knife techniques.
The three borings will require concrete coring of the sidewalk. If USTs are identified during the
evaluation, each borehole will be backfilled and patched with concrete until a UST Site
Assessment has been completed and closure options have been selected, If USTs are not
identified during the evaluation, each borehole will be backfilled and patched with concrete until
final restoration is made. Final sidewalk restoration will be made in accordance with City of
Edmonds, codes.
341MIGIVIRM,
Please contact the undersigned at (425) 295-0800 if you have questions or require additional
information.
Sincerely,
Farallon Consulting, L.L.C.
Brett !,,Carp
Environmental scientist
Attachments: Figure 1, Site Vicinity Map
Figure 2, Site Plan with Boring Locations
Traffic Control Plans
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REFERENCE: 7.5 MINUTE USGS QUADRANGLE EDMONDS EAST AND WEST, WASHINGTON, DATED 1953 AND PHOTOREVISED 1981
:EPM410INDS] FIGURE 1
SITE VICINITY MAP
OLD MILLTOWN PROPERTY
EDMONDS, WASHINGTON
FAP,ALLON CONSULTING
975 5th Avenue Northwest
WASHINGTON Issaquah, WA 99027 FARALLON PN: 721-003
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