ITEM NO: 6d_attach 
DATE OF MEETING: June 5, 2012 

SEPA ENVIRONMENTAL CHECKLIST 

South Riverside Drive, Shoreline Rehabilitation Project 
West Shoreline Duwamish Waterway 

A.  BACKGROUND 
1.   Name of proposed project, if applicable: 
South Riverside Drive, Shoreline Rehabilitation Project (fish and wildlife habitat restoration
project)Duwamish Waterway west shoreline, River Mile 3.2 
2.   Name of applicant:  Port of Seattle 
3.   Address and phone number of applicant and contact person: 
Geo. Blomberg 
Seaport Environmental and Planning Services 
Port of Seattle 
P.O. Box 1209 
Seattle, Washington 98111 
Telephone: 206-728-3194 
E-Mail: blomberg.g@portseattle.org 
4.  Date checklist prepared: December 19, 2011 
5.   Agency requesting checklist: Port of Seattle: Port of Seattle (SEPA Number: ) 
6.   Proposed timing or schedule (including phasing, if applicable): 
The proposed project includes removal of existing inter-tidal debris and excavation of existing
failing and eroding rubble-filled bank line, re-exposure of inter-tidal area, installation of low-impact
shoreline stabilization, planting of native marsh and riparian vegetation, and installation of a
shoreline pathway connecting South Riverside Drive and the Eighth Avenue South/South Portland
Street intersection. Pending approval by participating city, state, and federal agencies, the shoreline
rehabilitation project would be completed in December 2012. 
7.   Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain 
There are no current plans for additions, expansion or further changes in shoreline area at the
proposed shoreline rehabilitation  site  beyond the scope of the present proposal.  No other
construction activities or improvements are related to this proposal. 
8.   List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal. 

POS SEPA No 12-03 
South Riverside Drive 
Rehabilitation Project 
June 5, 2012 
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The Port is preparing an evaluation of soil conditions in upland area at the project site for the purpose
of (1) determining if contaminated soils are present at the site and (2) identifying the potential for reuse
of soils excavated or re-graded at the site. A copy of the soil evaluation may be obtained from
the  Port  for  review  (Contact  G.  Blomberg,  at  206-728-3194  or  by  email  at
blomberg.g@portseattle.org). 
Please note that the present proposal, excavation and grading in approximately 14,350 square feet of
publicly-owned shoreline area for the purpose of rehabilitating inter-tidal and shoreline fish and
wildlife habitat, is located adjacent to and north of the South Park neighborhood, Eighth Avenue
South public shoreline access site constructed by the port in 2007-2008. The present proposal is
intended to complement the previous public shoreline use and open space improvements. Copies of
the South Park public shoreline access environmental evaluation (Port of Seattle SEPA File Number
05-18) and permit approval documents are available for review and may be obtained, contact G.
Blomberg. (206-728-3194, blomberg.g@portseattle.org). 
9.   Do you know whether applications are pending for governmental approvals of other proposals
directly affecting the property covered by your proposal? If yes, explain. 
There are no other known applications pending for governmental approvals for other development
actions or proposals in the immediate vicinity of the proposed shoreline restoration site. 
10.  List any government approvals or permits that will be needed for your proposal, if known. 
City of Seattle  Shoreline Substantial Development/Master Use Permit 
City of Seattlestreet use authorization 
Washington Department of Fish and Wildlife  Hydraulic Project Approval 
US Army Corps of Engineers  Section 10/404 Permit 
Washington Department of Ecology  Section 401 Water Quality Certification 
11.  Give brief, complete description of your proposal, including the proposed uses and the size of
the project and site. There are several questions later in this checklist that ask you to describe
certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead
agencies may modify this form to include additional specific information on project
description.) 
The proposed shoreline rehabilitation project includes re-grading port-owned Duwamish Waterway
margin and adjacent City-owned South Riverside Drive right-of-way to provide combined intertidal
, marsh, riparian and upland vegetation, and publicly accessible shoreline. 
The proposed project includes approximately 180 linear feet of port-owned shoreline and upland
on the west margin of Duwamish Waterway and the water-ward portion of South Riverside Drive,
City of Seattle right-of-way, adjacent to port shoreline ownership. The existing abrupt and
eroding filled shoreline area includes industrial rubble, debris, and a derelict wooden barge.
Existing upland area includes unimproved port shoreline property and City right-of-way formerly
used for vehicle parking and uncovered construction materials storage. The existing derelict
wooden barge and inter-tidal debris field would be removed, re-exposing existing inter-tidal area. 
Habitat rehabilitation would also include excavating and re-grading the existing failing bank-line,
relocating the top-of-bank approximately ten to 15 feet land-ward. The re-shaped bank-line would
be stabilized using a combination of vegetated gabions, anchored large woody debris, and riparian
vegetation. Re -graded inter-tidal and shoreline area would be planted with native marsh and

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South Riverside Drive Rehabilitation Project 
June 5, 2012 
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riparian vegetation. Upland at the site would be re-graded to receive excavated shoreline
materials and for retention  of site surface water. Shoreline habitat restoration would be
complemented with a pedestrian pathway, connecting pedestrian use in South Riverside Drive
with the port's existing Eighth Avenue South public shoreline access site, constructed in 2007-
2008. 
The proposed shoreline rehabilitation project includes two elements: (1) inter-tidal area clean-up,
including removal of an existing derelict wooden barge and removal of industrial debris and
rubble and (2) re-grading an existing eroding, rubble filled bank line, removing previously placed
fill material to rehabilitate inter-tidal area, followed by installation of large woody debris, native
marsh, riparian, and upland vegetation. The proposed shoreline rehabilitation work will be
accomplished as follows: 
Remove existing derelict wooden barge and inter-tidal rubble: This will require barge -mounted
crane equipment or long-reach shoreline-based excavation equipment. The derelict barge will be
separated into sections and all barge material and debris removed from the inter-tidal area
(totaling approximately 1210 square feet). Concrete, metal, and other debris occupying adjacent
inter-tidal area will be hand-loaded into equipment hoppers or buckets (totaling approximately
2865 square feet). All barge material and debris will be removed to an approved upland disposal
site. The total volume of derelict barge and inter-tidal industrial debris removal is approximately
300 cubic yards, providing approximately 4075 square feet of re-exposed, rehabilitated inter-tidal
area. 
Shoreline re-grading and excavation: Shoreline restoration will include reducing existing
shoreline and upland elevations from approximately plus 15 to 16 feet MLLW to approximately
plus 11 to 13 feet MLLW. Approximately 425 cubic yards of shoreline excavation, consisting of
previously placed rubble and inert fill materials, is proposed. The MHHW contour will shift up to 
15 linear feet land-ward, providing approximately 1975 square feet of re-exposed,rehabilitated 
inter-tidal area suitable for establishing marsh vegetation. Please note that the existing bank line,
approximately 180 linear feet, will be expanded due to re-grading. The re-shaped bank line will
be longer, approximately 220 linear feet as a result of moving the bank line land-ward and
curving the bank line west into publicly-owned shore land area. 
Following excavating and re-grading of the eroding, rubble bank line, the re-shaped shoreline will
be stabilized using rock-filled gabions, shaped with vegetation planting tubes and pockets, to
form a terraced, vegetated bank edge. The vegetated gabions will include approximately 180
linear feet, between plus 14 and 11 feet MLLW, and require approximately 260 cubic yards
fractured rock-fill. The water-ward base of the vegetated gabions will be protected with large
woody debris anchored at the toe of the terraced gabion slope. 
Upland excavation will include grading to create a surface water collection/retention swale.
Existing grade elevations will be reduced approximately 1.5 to 2.0 feet, to 14.5 to 13 feet MLLW,
including removal of approximately 50 cubic yards. 
Shoreline and upland excavation materials will be stockpiled on site in the form of a landscape
mound. Placement of excavation materials includes use of locking concrete barriers to form a
back-wall for containing excavated materials as an elevated landscape mound. Approximately
180 linear feet of concrete barrier will be installed, allowing for a contoured mound sloping up-

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South Riverside Drive Rehabilitation Project 
June 5, 2012 
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ward from existing grade, approximately plus 15 MLLW, to a top-of-slope elevation at
approximately plus 23 feet MLLW. The landscape mound will be placed in existing upland area
and include a total of approximately 475 cubic yards of stockpiled excavated materials. 
Re-exposed inter-tidal area, between approximately plus 11 feet and 13 feet MLLW will be
planted with native marsh vegetation. Total area of new marsh plantings is expected to be
approximately 1975 square feet. 
In order to stabilize shoreline and upland slope conditions, and to improve shoreline natural
resource value, native riparian vegetation will be installed at the site. Shoreline and upland
vegetation will include approximately 8350 square feet riparian and upland trees, shrubs, and
ground-cover. 
Existing below-grade sanitary sewer and water lines will remain, unaffected by site grading
activities. 
12.  Location of the proposal. Give sufficient information for a person to understand the
precise location of your proposed project, including a street address, if any, and section,
township, range, if known. If a proposal would occur over a range of area, provide the range
or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and
topographic map, if reasonably available. While you should submit any plans required by the
agency, you are not required to duplicate maps or detailed plans submitted with any permit
applications related to this checklist. 

The proposed shoreline rehabilitation site, including combined Port of Seattle, Duwamish Waterway
property and South Riverside Drive, City of Seattle, right-of-way area, has no street address. The
project site is located on the west shoreline of the Duwamish Waterway, near River Mile 3.2, east of
the South Riverside Drive/South Holden Street/Seventh Avenue South intersection. 
South Riverside Drive project site: Latitude47 degrees, 32 minutes, 2 seconds (North Latitude);
Longitude122 degrees, 19 minutes, 24 seconds (West Longitude) 
Tax parcel number for Port of Seattle property located in shoreline areas of the Duwamish
Waterway: 292404HYDR. No tax parcel number applies for City of Seattle right-of-way area in
South Riverside Drive. 
Note: The proposed shoreline restoration project includes  removal of industrial debris  and
excavation and re-grading of an existing eroding bank line area located adjacent to River Mile 3.2 in
the Duwamish Waterway. The bank line and debris removal area is owned by the Port of Seattle.
Adjacent upland area, land-ward of the port's shoreline ownership, consisting of City of Seattle
right-of-way, will also be re-graded. Inter-tidal influence will be restored, expanding inter-tidal area
in public property controlled by the port and the City of Seattle. The proposed shoreline restoration
project includes two property owners, each with existing upland area converted to inter-tidal aquatic
area conditions.

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South Riverside Drive Rehabilitation Project 
June 5, 2012 
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TO BE COMPLETED BY APPLICANT 
B.  ENVIRONMENTAL ELEMENTS 
1.   Earth 
a.   General description of the site (circle one): Flat, rolling, hilly, steep slopes, and
mountainous, other __________. 
The South Riverside Drive shoreline rehabilitation site is located on the west shoreline of the
Duwamish Waterway, approximately 3.2  miles south of Harbor Island. The site is
approximately 0.75 miles south (upstream in the Duwamish Waterway) from the First Avenue
South Bridge crossing of the Duwamish Waterway and approximately 0.5 miles north of the
South Park Bridge. The site is without in-water or upland structures, excepting a METRO pump
station building, approximately 12 feet high and approximately 325 square feet, located
approximately 65 feet north of the east end of South Portland Street. A derelict, abandoned
wooden barge, approximately 55 feet long and 22 feet wide (approximately 1210 square feet),
occupies inter-tidal area at the north end of the proposed rehabilitation site. 
The proposed shoreline rehabilitation site includes approximately 14,350 square feet, obliquely
oriented to the existing shoreline at the water-ward (east) end of South Riverside Drive. The
proposed shoreline re-grading area includes upland elevations between 14 and 15 feet above
MLLW. The bank line at the site is abrupt and eroded, with concrete, metal, and inert rubble and
construction debris extending from a top-of-bank elevation at approximately plus 14 feet
MLLW to a toe-of-slope elevation between plus 10 and 11 feet MLLW. Water-ward of the toeof-slope
inter-tidal mud/sand substrate is present, with the MLLW contour approximately 40 to
70 feet water-ward and parallel to the toe-of-slope. Existing inter-tidal substrate surface area is
covered with substantial debris, resulting from past activities in the Duwamish Waterway and
derived from inert construction rubble used as past shoreline fill material eroding from the
unstable bank line. 
b.  What is the steepest slope on the site (approximate percent slope)? 
The steepest slopes at the proposed shoreline rehabilitation site are in the eroded bank line,
between elevation plus 14 and plus 10 feet MLLW. The slope profile is nearly vertical
throughout the entire project shoreline, approximately 180 linear feet. 
c.   What general types of soils are found on the site (for example, clay, sand, gravel, peat,
muck)? If you know the classification of agricultural soils, specify them and note any
prime farmland. 
All existing upland area at the proposed shoreline rehabilitation site consists of filled former
tideland area of the Duwamish River estuary. Fill at the site consists of sediments dredged from
the previous tideland area, excavated in the first two decades of the last century in order to
create deep draft navigational access in the Duwamish Waterway, and more recently placed fill
materials from adjacent upland locations. The site included in the present proposal consists 
entirely of filled upland and has no previous, existing, or potential agricultural use.

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d.  Are there surface indications or history of unstable soils in the immediate vicinity? If so,
describe. 
As a filled former aquatic area site, the proposed shoreline rehabilitation site is subject to
liquefaction and is identified by City of Seattle Critical Area maps as within a liquefaction zone.
Liquefaction potential zones are considered environmentally sensitive but not environmentally
critical areas. 
e.   Describe the purpose, type, and approximate quantities of any filling or grading proposed.
Indicate source of fill. 
No dredging or filling of existing aquatic area is proposed. Removal of up to 300 cubic yards of
existing inter-tidal debris and approximately 425 cubic yards of previously placed shoreline fill
material is proposed as a remedy for the existing actively eroding bank line. Excavation would
be restricted to areas landward of the existing MHHW contour and replace the existing nearly
vertical bank line with a vegetated gabion slope, with native marsh vegetation and large woody
debris at the new toe-of-slope and native riparian vegetation stabilizing the upper portions of the
rehabilitated slope. 
f.   Could erosion occur as a result of clearing, construction, or use? If so, generally describe. 
No erosion due to the proposed project, in existing upland area or adjacent aquatic area, is
anticipated. All construction activities will take place in existing upland areas or, in the case of
barge and debris removal, during periods of low water, when tide levels are below work area
elevations. Debris removal will extend to approximately plus four feet MLLW, however, no
inter-tidal grading will take place and debris removal will be limited to exposed low-water
periods. Excavation of the failed rubble bank line will extend no lower than approximately
MHHW. 
g.   About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)? 
The proposed shoreline rehabilitation project includes approximately 14,350 square feet. No
impervious surface is within the project site at present and no new impervious surface is
proposed. 
h.  Proposed measures to reduce or control erosion, or other impacts to the earth if any: 
Best management practices for control of potential sources of erosion will be implemented
during derelict barge and inter-tidal debris removal and during excavation for the purpose of
shoreline restoration, consistent with the City of Seattle Stormwater, Grading, and Drainage
Control Ordinance and Department of Planning and Development Director's Rule 6-93. 
Re-shaping existing eroded shoreline areas in order to re-expose inter-tidal area and create more
gradual transition slopes between MHHW and the relocated top-of-bank will entail up to 425 
cubic yards of excavation of bank line and shoreline areas above approximately MHHW. A
temporary erosion and sediment control plan will be prepared for managing site excavation and
re-grading. During excavation the water-ward portion of the site will be isolated with a floating
debris boom and upland areas will be fitted with temporary silt fences. All exposed soil surfaces
will be protected from storm water-related sediment disruption through use of temporary straw
bales and graded slopes will be stabilized by application of erosion control, plant-fiber mats and
formed plant material logs. Finally, all re-shaped bank line and excavated upland areas will

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June 5, 2012 
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receive native marsh plants and riparian and upland vegetation as long-term soil stabilization
measures. 
2.   Air 
a.   What types of emissions to the air would result from the proposal (i.e., dust, automobile,
odors, and industrial  wood smoke) during construction and when the project is
completed? If any, generally describe and give approximate quantities if known. 
The proposed activity is limited to the following construction activities: (1) removal of up to
300 cubic yards of existing inter-tidal debris; (2) excavation of approximately 425 cubic yards
of previously placed fill material; (3) stabilizing the new shoreline slope with a sub-surface and
terraced vegetated gabions, including up to 260 cubic yards of confined rock fill; (4) stockpiling
excavated shoreline soils as an on-site landscaped berm;  and, (5) placement of topsoil and
mulch, with subsequent installation of native riparian and marsh vegetation. 
Air emissions are expected from vehicles and equipment used during excavation and grading.
Equipment anticipated for use at the site will include motor-powered construction machinery
and heavy trucks. 
Please note that air emissions anticipated from the completed rehabilitation area will be minimal
and limited to maintenance vehicles and vehicles used by site visitors. Air emissions from the
finished fish and wildlife habitat site are not expected to change substantially in comparison
with past activities at the site. 
b.  Are there any off-site sources of emissions or odor that may affect your proposal? If so,
generally describe. 
No off-site sources of air emissions are present that have the potential to adversely affect the
present proposal. 
c.   Proposed measures to reduce or control emissions or other impacts to air, if any: 
Motor-powered equipment used for the proposed construction activities  and subsequent
maintenance operations will be operated and maintained consistent with existing air emissions
requirements. 
3.   Water 
a.   Surface 
1)  Is there any surface water body on or in the immediate vicinity of the site (including
year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe
type and provide names. If appropriate, state what stream or river it flows into. 
The proposed project site is located on the west margin of the Duwamish Waterway, in the
area of river mile 3.2. Please note that the Duwamish Waterway is continuous with the 
Green/Duwamish watershed (WRIA 9). 
2)  Will the project require any work over, in, or adjacent to (within 200 feet) the
described waters? If yes, please describe and attach available plans. 
The proposed project will take place in existing shoreline area. Shoreline excavation and
upland grading will take place within 200 feet of the shoreline. Re-shaping of the existing
eroded shoreline is proposed landward of the approximate MHHW, while construction

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South Riverside Drive Rehabilitation Project 
June 5, 2012 
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activities proposed for area between MHHW and plus four feet MLLW will be limited to
removal of existing rubble and derelict materials. 
3)  Estimate the amount of fill and dredge material that would be placed in or removed 
from surface water or wetlands and indicate the area of the site that would be
affected. Indicate the source of fill material. 
No dredging or fill activities are proposed. 
4)  Will the proposal require surface water withdrawals or diversions? Give general
description, purpose, and approximate quantities if known. 
No surface water withdrawals or diversions are proposed as part of the proposed project. 
5)  Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. 
The proposed shoreline rehabilitation project will alter existing inter-tidal and adjacent
shoreline and upland areas. Project activities will take place in existing aquatic area, below
MHHW. Please note, however, that the shoreline restoration project is located in non-flow
restricted flood plain area in the Duwamish Waterway. In addition, one of the shoreline
rehabilitation objectives is to increase area subject to tidal influence. As a result the intertidal
aquatic area prism at the project site will increase, improving the volume of tidal
influence in this portion of the Duwamish Waterway. 
6)  Does the proposal involve any discharges of waste materials to surface waters? If so,
describe the type of waste and anticipated volume of discharge. 
The proposed shoreline rehabilitation project does not include discharge of waste materials
to aquatic area in the adjacent Duwamish Waterway. 
Two aspects of the proposed project are important to note regarding potential releases of
contaminants to aquatic area in the Duwamish Waterway. First, all operating equipment at
the site will be subject to best management practices (BMPs) and Spill Prevention,
Containment and Countermeasures (SPCC) plans implemented to avoid and minimize
potential releases of fuel and petroleum products used by construction equipment to the
marine environment. Second, proposed derelict barge and inter-tidal debris removal
activities will be controlled by best management practices intended to avoid and minimize
potential releases of fugitive materials to the aquatic environment. 
Please refer to Section B.3.d. below for additional information concerning avoiding and
minimizing potential adverse effects to aquatic area in the Duwamish Waterway, aquatic
area important to fish and wildlife habitat. 
b.  Ground: 
1)  Will ground water be withdrawn, or will water be discharged to ground water? Give
general description, purpose, and approximate quantities if known. 
The proposed project, including excavation of up to 425 cubic yards of existing fill
material, with on-site placement of all excavated material does not include withdrawal of
groundwater or discharge of materials to ground water at the project site. 
2)  Describe waste material that will be discharged into the ground from septic tanks or
other sources, if any (for example, Domestic sewage; industrial, containing the
following chemicals; agricultural; etc.). Describe the general size of the system, the

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June 5, 2012 
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number of such systems, the number of houses to be served (if applicable), or the
number of animals or humans the system(s) are expected to serve. 
The proposed project does not include any discharge of waste material to ground water at
the site. 
c.   Water Runoff (including storm water): 
1)  Describe the source of runoff (including storm water) and method of collection and
disposal, if any (include quantities, if known). Where will this water flow? Will this
water flow into other waters? If so, describe. 
Upland excavation will include grading to create a surface water collection/retention
swale. Existing grade elevations will be reduced approximately 1.5 to 2.0 feet, to 14.5 to
13 feet MLLW, including removal of approximately 50 cubic yards. The surface water
collection/retention swale is intended to receive upland storm water from public right-ofway
and port shoreline property, including the proposed upland excavated material
stockpile landscape berm. 
Excavation and grading activities necessary to re-shape existing eroded bank line areas will
be controlled using silt fences, debris booms and plant materials, including woven, plant
material mats and fabric. These erosion control practices are expected to minimize and
avoid potential discharges of sediment-laden storm water to the Duwamish Waterway. 
The proposed shoreline rehabilitation area will be in use as a permanent fish and wildlife
habitat and public use/open space area. Following construction, the re-graded area will
include a combination of native shoreline and upland vegetation cover, with the only
exception being a pedestrian pathway linking South Riverside Drive right-of-way with the
previously constructed public shoreline access site. 
Placement of native vegetation will be accompanied by use of plant material fabric and
mats to prevent erosion during plant establishment. Site design will ensure that storm water 
will infiltrate or flow through vegetated areas to the retention swale, minimizing potential
discharge to the Duwamish Waterway. No below-grade storm water conveyance system or
drainage system is proposed for the site. 
2)  Could waste materials enter ground or surface waters? If so, generally describe. 
Only minimal volumes of waste materials, anticipated rubble or potentially contaminated
upland soils, will be generated during excavation and grading activities. These materials
will be confined and collected as they are exposed and identified, with the objective of
avoiding and minimizing releases of debris to surface water. 
Please note that motorized equipment used for construction activities at the proposed public
shoreline access site  will be subject to stringent controls prohibiting discharge of
deleterious materials to the aquatic environment. 
d.  Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: 
All excavation and grading activities will be controlled to avoid and minimize potential releases
of debris to the aquatic environment. Motorized equipment used to perform excavation and
grading activities will be subject to prudent best management practices and stringent discharge
controls.

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June 5, 2012 
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Potential adverse effects on water quality and wildlife are expected to be limited to temporary,
localized turbidity increases in the Duwamish Waterway in the vicinity of excavation at the
existing filled shoreline toe-of-slope. In addition, removal of derelict barge and rubble debris
may result in temporary and limited turbidity. 
Potential adverse effects will be minimized during excavation and grading by the following inwater
construction controls and best management practices: 
All in-water excavation and grading activities will be limited to periods determined by
participating state and federal agencies to avoid potential adverse effects on migratory
fish 
Barge removal, rubble removal, and excavation of the existing failed bank line will be
limited to periods when work areas are exposed by low tide conditions. 
Best management practices, spill response procedures, and erosion and sediment control
measures will be implemented during all phases of work in shoreline and upland
locations to avoid discharges and prevent entry of debris to surface waters.
No dredging or placement of fill material is proposed. 
4.   Plants 
a.   Check or circle types of vegetation found on the site: 
___ deciduous tree: alder, maple, aspen, other 
___ evergreen tree: fir, cedar, pine, other 
___ shrubs 
___ grass 
___ pasture 
___ crop or grain 
___ wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other 
___ water plants: water lily, eelgrass, milfoil, other 
___ other types of vegetation 
b.  What kind and amount of vegetation will be removed or altered? 
Present upland and bank line conditions at the proposed shoreline restoration site include two small 
deciduous trees (less than 15 feet in height), blackberry vines, annual grasses, and weedy vegetation.
No significant native vegetation is present in the area. Please note that the base of the eroding bank
line includes several isolated emergent plants, consisting of sedge, rush, and salt-grass vegetation,
with a total area of less than fifteen square feet. 
The proposed shoreline rehabilitation project includes re-shaping the existing eroded bank lineto 
create native riparian and marsh  planting area throughout the entire 220  linear feet  of the
rehabilitated bank line. 
c.   List threatened or endangered species known to be on or near the site. 
No threatened or endangered plant species are known to be in the project area. 
d.  Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any:

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The objective of the proposed shoreline project is to combine environmental restoration and the
existing Eighth Avenue SouthSouth Park public shoreline access site, adjacent and upstream
(south) from the shoreline rehabilitation area. Present plans for the site include re -shaping existing
eroded bank line conditions, moving the top-of-bank approximately 10 to 15 feet land-ward, to
create a gradual shoreline slope in place of a nearly vertical, unstable bank line. The re-shaped slope,
beginning at the MHHW contour and extending landward to approximately plus 15 feet MLLW will
be stabilized with vegetated gabions, large woody debris, and native riparian and marsh vegetation.
In addition, upland area, where excavation materials will be shaped as a landscaped stockpile 
mound, will receive native upland vegetation as habitat improvements located in the shore land
district boundary. No existing emergent vegetation will be removed. 
5.   Animals 
a.   Circle any birds and animals which have been observed on or near the site or are known to be on or
near the site: 
birds: hawk, heron, eagle, songbirds, other: 
mammals: deer, bear, elk, beaver, other: 
fish: bass, salmon, trout, herring, shellfish, other: 
The  proposed shoreline rehabilitation  site includes approximately 14,350  square feet and
approximately 180 linear feet of shoreline. The existing upland and shoreline have been significantly
altered by past filling activities. Shore land and upland area at the site does not include significant
upland habitat for birds or mammals. Aquatic area in the adjacent Duwamish Waterway, connecting
with the East and West Waterway in south Elliott Bay, approximately 3.2 miles downstream, and 
upstream to the Green/Duwamish River, provides habitat important to numerous species of resident
and migratory fish and wildlife. 
The proposed shoreline rehabilitation project is intended to remove a modest amount of derelict
materials and rubble from upper intertidal area at the project site, followed by excavation of the
existing eroded bank line in order to re-establish inter-tidal conditions in filled former aquatic area.
Following site grading the project area will receive dense plantings of native riparian trees and
shrubs. In combination, these improvements are expected to enhance the aquatic resource value of
existing adjacent intertidal and shallow sub-tidal area in the Duwamish Waterway. These actions
will, therefore, provide the potential for positive aquatic area effects, offsetting any potential
negative effects due to temporary in-water construction activities included in the proposed project. 
The proposed bank line  re-grading  and re-vegetation activities represent  minimal in-water
construction activities. These activities will, however, require review by City of Seattle, state, and
federal agencies. In recent years, development and construction activities in marine and estuarine
locations in Puget Sound have been the subject of increased scrutiny as a result of Endangered
Species Act listings, with particular concern for the life cycle and aquatic habitat requirements of
ESA listed species. The following provides summary information concerning potential adverse
effects on fish and wildlife due to the public shoreline access improvement project, emphasizing fish
and wildlife of particular concern. 
Species listed under the Endangered Species Act (ESA) that may be present in the vicinity of the
proposed shoreline rehabilitation project include: (1) Puget Sound Chinook salmon  threatened; (2)
bull trout- threatened; (3) Stellar sea lion  threatened; (4) humpback whale  endangered; and (5)
bald eagle  threatened.

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 12 of 23 
South Elliott Bay, the East Waterway and West Waterway, and the Duwamish Waterway are part of
a migration corridor important to anadromous salmon species, serving as a connection between
Elliott Bay and the Green/Duwamish watershed. In particular, Puget Sound Chinook and bull trout
are known to use the project area. 
Removal of derelict barge and rubble/debris from inter-tidal area, followed by rehabilitation of the
existing eroded bank line to restore area to inter-tidal influence, are not expected to result in direct
effects, indirect effects, or cumulative effects on ESA-listed species of concern in the Duwamish
Waterway. Construction activities necessary to accomplish shoreline restoration have the potential to
temporarily increase turbidity in water column habitat that could be occupied by sub-adult or adult
salmonids, but no adverse effects are expected. Because specific project timing and construction
methods will be used to control potential adverse effects, turbidity is not expected to affect juvenile
Chinook salmon or bull trout. 
Extraction of derelict materials and rubble/debris will disturb some subtidal and intertidal benthic
infauna, but effects on these populations would be temporary and are not expected to adversely
affect Chinook salmon or bull trout. 
Bald eagles that may be present in the project area, and their prey, could be temporarily disturbed by 
shoreline construction activities. However, bald eagles that have been observed near the project area
appear to be habituated to a relatively high level of human activity, and rehabilitation of shoreline at
this location is not expected to adversely affect eagles. Further, given the large feeding territories
occupied by bald eagles, temporary disturbance of prey at the relatively compact work site, affecting
approximately 0.3 acres of combined upland and aquatic area along the west bank line of the
Duwamish Waterway, is not expected to impair foraging opportunities for these birds. The nearest
known bald eagle nest site is approximately 5.5 miles north and west of the project site. 
Steller sea lions are not common in the project area and typically would not be expected to enter the
area when construction activities occur. Humpback whales are unlikely to be present in the project
area at any time. There are no direct, indirect, or cumulative effects due to the proposed project that
are expected to adversely affected Steller sea lions or humpback whales. 
b.  List any threatened or endangered species known to be on or near the site. 
Species listed under the Endangered Species Act (ESA) that may be present in the vicinity of the
proposed shoreline restoration project include: (1) Puget Sound Chinook salmon  threatened; (2)
bull trout- threatened; (3) Stellar sea lion  threatened; (4) humpback whale  endangered; and (5)
bald eagle  threatened. 
c.   Is the site part of a migration route? If so, explain. 
South Elliott Bay, the East and West Waterways, and the Duwamish Waterway, comprise a portion
of the migration corridor important to anadromous salmon species, linking Elliott Bay and the
Green/Duwamish watershed. In particular, Puget Sound Chinook and bull trout are known to use the
project area. 
d.  Proposed measures to preserve or enhance wildlife, if any: 
Measures to avoid and minimize potential adverse effects on ESA species of concern and, as a result,
function as conservation measures, may include a combination of the following: 
Timing restrictions specifying allowable in-water work periods. Removal of derelict barge
materials and rubble/debris and shoreline excavation/re-shaping activities would take place

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 13 of 23 
only between August 15 and February 15, or other period determined by state and federal
agencies. In addition, in-water debris removal and shoreline excavation will be accomplished
during low water periods, when work areas are fully exposed by low tide levels. 
Water quality standards and procedures that limit the effect of turbidity to a defined mixing
zone, stipulate limits for chemical constituents, dissolved oxygen, and other parameters,
implemented by the Washington Department of Ecology. 
Best management practices (BMPs ) required to reduce the potential for construction-related
potential affects on aquatic species and their habitats, including: (1) prevention of releases of
petroleum products, chemical, or other toxic or deleterious materials to the water; (2)
immediate stop of work to report and contain any spills or releases, and, (3) preparation and
application of a Spill Prevention, Control, and Countermeasure (SPCC) plan for use through
the piling removal and installation activities. 
Upland area at the proposed shoreline rehabilitation site is the result of more than 80 years of past
development and fill activities. Existing intertidal mud/sand substrate (extending water ward from
approximately plus 11 feet MLLW to minus four feet MLLW) consists of a relic band of native
sediment exposed during construction of the Duwamish Waterway. Sub-tidal aquatic area (water
depths greater than minus four feet MLLW) water-ward of the project site is the result of past
waterway dredging actions. 
Two proposed development actions have the potential to alter existing intertidal and sub-tidal aquatic
area at the project site. First, removal of up to approximately 300 cubic yards of combined derelict
barge and rubble/debris from existing intertidal area will improve intertidal habitat conditions
between plus 11 feet and plus four feet MLLW. Second, re-habilitation of up to 180 linear feet of
bank line by eliminating erosion and replacing an abrupt bank profile with a terraced, vegetated
gabion bank line up to 15 feet land-ward of the existing bank line, accompanied by densely planted
native marsh and riparian vegetation, will enhance the biological resource value of adjacent intertidal
and shallow sub-tidal aquatic areas. 
Please also see Section B.3.d. (Water) above for measures to avoid and minimize potential adverse
effects on water resources important to the life forms noted above. 
6.   Energy and Natural Resources 
a.   What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the
completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc. 
No significant change in use of energy is anticipated to result from the proposed shoreline
rehabilitation project. No structures or other energy-requiring facilities are included in the
proposed project. 
b.  Would your project affect the potential use of solar energy by adjacent properties? If so,
generally describe. 
The proposed project will have no adverse effect on potential use of solar energy at adjacent
sites. 
c.   What kinds of energy conservation features are included in the plans of this proposal? List
other proposed measures to reduce or control energy impacts, if any:

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 14 of 23 
Fuel-efficient electrical and motorized equipment will be used to the extent possible during
construction of the proposed project. Please note that the proposed project includes restoration
of fish and wildlife habitat and passive public use/open space and does not include operations at
the site with requirements for energy use. 
7.   Environmental Health 
a.   Are there any environmental health hazards, including exposure to toxic chemicals, risk of
fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal?
If so, describe. 
The proposed project does not include operations or activities with the potential to produce
hazardous materials or waste products at the site. Please note that the proposed shoreline
rehabilitation site has no history of past industrial use and the potential for hazardous materials
due to past industrial practices at the site is minimal. However, the location has been altered in
the past 80 years through placement of fill material, elevating the site from upper intertidal
elevation, approximately plus ten to 11 feet MLLW to approximately 14 to 15 feet above
MLLW. In addition, the adjacent Duwamish Waterway is identified as a Federal Superfund site.
The present proposal will be reviewed with the Environmental Protection Agency and
participating natural resource trustees to ensure that debris removal from existing aquatic area is
consistent with emerging Duwamish Waterway Superfund requirements, aiding in correction of
waterway conditions, without impeding future cleanup actions in the waterway. 
Item A.8. above, indicates that previously placed upland fill material at the site will be evaluated
for potential presence of contamination. Soil test results will determine the necessity for
placement of excavation materials at an off-site controlled landfill or if excavation materials
may be safely re-used at the site in preparation of landscape berms. 
Please note that motorized equipment used for construction activities may include potentially
hazardous materials in the form of fuel, lubricants, and associated materials. These materials
will be subject to local, state, and federal controls and regulations pertaining to use, handling,
and storage. No increase in exposure is anticipated. 
1)  Describe special emergency services that might be required. 
No special emergency services are anticipated or necessary due to the proposed project. 
2)  Proposed measures to reduce or control environmental health hazards, if any: 
Potentially hazardous fuels, lubricants, and associated materials used for operation of motorized
equipment as part of the proposed excavation and re-grading activities will be subject to existing
local, state, and federal controls for use, handling, and storage, with the objective of avoiding
potential environmental health exposure and hazards. 
b.  Noise 
1)  What types of noise exist in the area which may affect your project (for example: traffic
equipment, operation, other)? 
The proposed shoreline rehabilitation project site is located on the west shoreline of the Duwamish
Waterway, near river mile 3.2, between the First Avenue South and South Park bridge crossings of
the Duwamish Waterway. The site is in the Duwamish industrial area and existing sources of noise
at the site include motor-driven vehicles, particularly heavy trucks and industrial equipment.

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 15 of 23 
2)  What types and levels of noise would be created by or associated with the project on a shortterm
or a long-term basis (for example: traffic, construction, operation, other)? Indicate what
hours noise would come from the site. 
Short-term noise levels will be affected at the site during construction. Noise-generating construction
equipment will include derelict barge and debris removal activities, excavation and grading, hauling
of project materials to and from the site, and installation alternative shoreline stabilization features. 
Construction activities are expected to take place during normal working hours. It is expected that
noise generated from construction equipment will be within existing industrial area day time baseline
levels and noise levels are not expected to exceed industrial noise code standards implemented by
City of Seattle. 
No significant increase in noise resulting from public use of the site is expected to result from the
proposed project. 
3)  Proposed measures to reduce or control noise impacts, if any: 
All motorized construction equipment will be maintained and operated consistent with prudent
measures to control potential noise emissions. 
8.   Land and Shoreline Use 
a.   What is the current use of the site and adjacent properties? 
The proposed shoreline rehabilitation site is located in the Duwamish industrial area, surrounded by
sites and businesses built and committed to general industrial uses and activities. 
b.  Has the site been used for agriculture? If so, describe. 
The project site, as filled, former estuarine aquatic area, has no historic agricultural use. 
c.   Describe any structures on the site. 
The site proposed for rehabilitation of shoreline features benefiting estuarine and shoreline fish
and wildlife resources does not include above grade structures, in upland or aquatic area. 
Upland area at the site, west of the shoreline proposed for excavation and re-grading, consists of
un-improved street right-of-way and vacant shoreline property separating street right-of-way and
the Duwamish Waterway. Upland area has been used in past years for vehicle parking and
outdoor storage. As public right-of-way, no structures or exclusive, permanent uses of the area
have been permitted. Similarly, the narrow upland strip located between the east end of the street
right-of-way and the Duwamish Waterway has no above-grade structures and past use has been
limited to vehicle parking and un-improved, outdoor storage. No above-grade structures are
present in the area of the proposed project, water-ward of MHHW. The site has not been subject
to industrial uses or moorage. Please note, however, that an above grade vessel/structure is
present at the north margin of the site, consisting of a derelict wooden barge, approximately 1210
square feet in area. 
Below-grade structures at the site include two utility lines, passing through street right-of-way,
through the shoreline property between the right-of-way and the Duwamish Waterway, and
connecting to public right-of-way at the South Portland Street/Eighth Avenue South intersection.
The below-grade utilities consist of: (1) a single 36 inch diameter sanitary sewer line,
approximately eight feet below-grade and (2) a single 12 inch diameter water line, approximately
three feet beneath existing ground level.

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
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The proposed project area is un-improved. No storm water pipe collection system, catch basins,
or storm water outfall is present. The site is un-paved. 
d.  Will any structures be demolished? If so, what? 
The proposed project includes only limited demolition, including removal of a derelict abandoned
wooden barge and rubble/debris from existing intertidal area. 
e.   What is the current zoning classification of the site? 
The existing zoning classification is Heavy Industrial (IG1/U 65) 
f.   What is the current comprehensive plan designation of the site? 
Existing comprehensive land use designations for the site include Heavy Industrial, General
Industrial, and Manufacturing. 
g.   If applicable, what is the current shoreline master program designation of the site? 
The present City of Seattle Shoreline Master Program designation for the site is Urban Industrial
(UI). 
h.  Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. 
City of Seattle Critical Area Maps indicate that the project site is within a liquefaction zone, since the
upland and shoreline area proposed for excavation and re-grading was created by means of fill 
placed in a portion of former Duwamish estuary tidelands. Liquefaction zones are considered
environmentally sensitive but not environmentally critical areas. 
i.    Approximately how many people would reside or work in the completed project? 
No residential uses are present at the project site and no residential occupancy isproposed. No 
workers would be employed at the finished shoreline restoration site. 
j.   Approximately how many people would the completed project displace? 
The completed project will not result in displacement of workers. 
k.  Proposed measures to avoid or reduce displacement impacts, if any: 
No displacement of residents will result from the proposed project; therefore, no measures for
avoiding or reducing displacement impacts are included in the present proposal. 
l.    Proposed measures to ensure the proposal is compatible with existing and projected land uses
and plans, if any: 
The proposed shoreline rehabilitation project is consistent with existing plans approved by the City
of Seattle and the port, relating to fish and wildlife habitat restoration, shoreline stabilization, and
improved public shoreline use and open space. Estuarine habitat restoration and public shoreline use
at the proposed location are intended to be compatible with adjacent industrial uses and activities,
while serving as an area-wide and community asset for the nearby South Park neighborhood. The
project is consistent with the port's long-rangeSeaport facility objectives and consistent with the
permitted uses and activities identified in the Seattle Shoreline Master Program. 
9.   Housing 
a.   Approximately how many units would be provided, if any? Indicate whether high, middle, or
low-income housing. 
No housing units are included in the proposed project.

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 17 of 23 
b.  Approximately how many units, if any, would be eliminated? Indicate whether high, middle,
or low-income housing. 
No housing units would be eliminated due to the proposed project. 
c.   Proposed measures to reduce or control housing impacts, if any: 
Since no housing resources will be affected, no measures to reduce or control adverse effects on
housing are included in the present proposal. 
10.  Aesthetics 
a.   What is the tallest height of any proposed structure(s), not including antennas; what is the
principal exterior building material(s) proposed? 
Proposed site changes include grade-level construction throughout, with the exception of creating an 
upland landscape berm to receive excavated shoreline materials. The landscape berm would for a
mound up to eight feet above existing grade level (top of berm elevation approximately 23 feet
above MLLW and existing street right-of-way grade elevations of approximately plus 15 feet
MLLW). 
b.  What views in the immediate vicinity would be altered or obstructed? 
No adverse effects on views of adjacent water and shoreline areas are expected to result from the
proposed fish and wildlife habitat restoration activities. Public use or the area will include improved
shoreline views/perspectives. 
c.   Proposed measures to reduce or control aesthetic impacts, if any: 
No significant changes in view conditions at the site are anticipated and no offsetting aesthetic
measures are included in the present proposal. 
11.  Light and Glare 
a.   What type of light or glare will the proposal produce? What time of day would it mainly
occur? 
The proposed shoreline rehabilitation project does not include any new lighting or changes in
existing lighting. 
b.  Could light or glare from the finished project be a safety hazard or interfere with views? 
No lighting is proposed and existing conditions will not be altered. 
c.   What existing off-site sources of light or glare may affect your proposal? 
No off-site sources of light and glare in the area of the project site are expected to adversely affect
the present proposal. 
d.  Proposed measures to reduce or control light and glare impacts, if any: 
No glare reduction or control measures are necessary. 
12.  Recreation 
a.   What designated and informal recreational opportunities are in the immediate vicinity? 
The Port of Seattle has constructed and maintains four public shoreline access sites in the Duwamish
Waterway in the area of the proposed shoreline rehabilitation project: (1) Duwamish Public Access
at Terminal 105, 4030 West Marginal Way Southwestincluding 210 feet of shoreline, 1.3 acres,
fishing pier, covered tables, hand-carried boat launch, and fish and wildlife habitat; (2) Diagonal

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 18 of 23 
Avenue South Public Access, at Terminal 108, west of East Marginal Way South, on Diagonal
Avenueincluding 1.2 acres with 700 feet of shoreline, interpretive signs, hand-carried boat launch,
and fish and wildlife habitat restoration area; (3) Duwamish Public Access at Terminal 107, 4700
West Marginal Way Southwestincluding 7.2 acres, wildlife observation, shoreline pathway, tables
and benches, interpretive information, and fish and wildlife habitat restoration areas; and, (4) Eighth 
Avenue SouthSouth Park Public Shoreline Access Siteincluding approximately 17,000 square
feet and 200 linear feet of shoreline, with seating, tables, concrete walkways, steps to MHHW
access, native marsh/riparian vegetation, and passive shoreline stabilization. Additional public use
areas near the project site include public right-of-way at the east shoreline of the Duwamish
Waterway, Eighth Avenue South street-end, Georgetown, and public access and fish and wildlife
habitat areas in the area of Turning Basin Number Three, upstream of the project site. 
b.  Would the proposed project displace any existing recreational uses? If so, describe. 
The proposed project will not alter or disrupt existing public shoreline or recreational uses in the
project area. 
c.   Proposed measures to reduce or control impacts, if any: 
As described above, the objective of the proposed shoreline rehabilitation project is to complement
the existing Eighth Avenue SouthSouth Park public shoreline access site, adding approximately
0.3 acres of restored fish and wildlife habitat, native vegetation, upland native vegetation, and a
connecting pathway to South Riverside Drive public right-of-way.
13.  Historic and Cultural Preservation 
a.   Are there any places or objects listed on, or proposed for, national, state, or local preservation
registers known to be on or next to the site? If so, generally describe. 
No listed historic or cultural resource sites are known to be present at or adjacent to the project site.
The possibility that historic or cultural resources are present at the site is low since the present
shoreline site consists of fill placed in former aquatic area of the Duwamish estuary. 
Please note that aquatic area in the vicinity of the project site consists of Treaty-reserved "usual and
accustomed" fishing area. The Muckleshoot Indian Tribe, together with the Washington Department
of Fish and Wildlife, manages fishing activity in this area. Fishing by Tribal members in this area is
consistent with past federal government treaties and subsequent court decisions. Treaty fishing is an
ongoing activity, and thus, a baseline condition within this area. 
Members of the Muckleshoot Indian Tribe harvest chinook, coho, chum, pink and steelhead salmon
in the Elliott Bay/Duwamish traditional fishing areas during summer, fall, and winter of each year,
generally from August through February. The shoreline restoration site is an active set net fishing
area. Removal of the derelict barge and inter-tidal debris field will improve the area for net fishing,
eliminating obstacles to placement of nets. No loss of fishing access will result from the proposed
shoreline rehabilitation project. 
b.  Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural
importance known to be on or next to the site. 
No landmarks or evidence of historic, archaeological, scientific, or cultural features of importance
are known to be at the project site or potentially affected by project actions. 
c.   Proposed measures to reduce or control impacts, if any:

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 19 of 23 
No potential adverse effects on historic resources are anticipated and no measures are proposed to
reduce or control such effects. 
The port acknowledges the need to evaluate the present proposal in detail with the Muckleshoot
Indian Tribe to determine actions necessary to avoid and minimize potential negative effects on
Treaty fishing access. It is important that construction activities necessary for the proposed project
avoid and minimize potential disruption of Treaty fishing activities. 
14.  Transportation 
a.   Identify public streets and highways serving the site, and describe proposed access to the
existing street system. Show on site plans, if any. 
The proposed shoreline rehabilitation site is located on the west margin of the Duwamish Waterway,
in the South Park neighborhood. The site is east of Highway 99 and Highway 509, south of the First
Avenue South Bridge, and north of the South Park. The street grid in South Park provides
connections to Highway 99 and 509, West Marginal Way Southwest, the Southwest Spokane Street 
corridor and East Marginal Way South via existing direct links and arterial traffic routes. 
b.  Is site currently served by public transit? If not, what is the approximate distance to the
nearest transit stop? 
Public transit routes are present south and west of the project site, using Eighth Avenue South, South
Kenyon Street, Fifth Avenue South, and South Holden Street. The nearest King County-Metro
service is present at the intersection of Eighth Avenue South and South Kenyon Street, Metro Route
132.
c.   How many parking spaces would the completed project have? How many would the project
eliminate? 
The proposed project does not include on-site parking. Approximately 7450 square feet of existing
public right-of-way will be altered, removing a modest area of potential vehicle and material storage
potential in the water-abutting portion of the South Riverside Drive street end. Off-site employee
parking areas used by businesses located in adjacent areas of South Riverside Drive will not be
affected. Please note th at South Riverside Drive is not a "through street", ending at the west
shoreline of the Duwamish Waterway. The proposed rehabilitation project will not eliminate a
transportation route. Nor will be project remove existing, approved uses of public right-of-way for
vehicle parking or material/equipment storage. 
d.  Will the proposal require any new roads or streets, or improvements to existing roads or
streets, not including driveways? If so, generally describe (indicate whether public or private). 
The proposed does not include new street improvements. However, existing street use area will be
diminished for the purpose of fish and wildlife habitat restoration. 
e.   Will the project use (or occur in immediate vicinity of) water, rail, or air transportation? If so,
generally describe. 
No changes in adjacent rail or air transportation will result from the proposed project. It is important
to note that the proposed project is not expected to result in significant changes in vehicle use
patterns or the number of vehicles in the area. 
f.   How many vehicular trips per day would be generated by the completed project? If known,
indicate when peak volumes would occur.

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 20 of 23 
No significant change in the volume vehicles in the area is expected. 
During construction, it is expected that vehicle use will include truck trips necessary for material
hauling (including removal of demolition materials and delivery of construction materials) and
construction employee trips. The total number of construction vehicle trips is not expected to exceed
25 trips per day, during a potential 12 week construction period. 
g.   Proposed measures to reduce or control transportation impacts, if any: 
No negative effects on transportation in the area of the project site are anticipated. Vehicle parking
and storage of materials in the water-ward portion of South Riverside Drive will be eliminated.
However, sufficient remaining street right-of-way is present in the area to accommodate worker
vehicle and heavy vehicle parking, as well as potential material storage uses, in support of adjacent
commercial and industrial activities, subject to street use approval from the City of Seattle. 
15.  Public Services 
a.   Would the project result in an increased need for public services (for example: fire protection,
police protection, health care, schools, other)? If so, generally describe. 
No increase in public services is anticipated as a result of the proposed project. 
b.  Proposed measures to reduce or control direct impacts on public services, if any. 
No measures for offsetting, reducing or controlling negative effects on public services are required. 
16.  Utilities 
a.   Circle utilities currently available at the site: electricity, natural gas, water, refuse service,
telephone, sanitary sewer, septic system, other. 
The project site does not require utility service of any kind. 
b.  Describe the utilities that are proposed for the project, the utility providing the service and the
general construction activities on the site or in the immediate vicinity that might be needed. 
No utilities are included in the proposed project and none will be required. 
C.  SIGNATURE 
The above answers are true and complete to the best of my knowledge. I understand that the lead agency is
relying on them to make its decision. 

Signature: 
Geo. Blomberg 
Seaport Environmental 
Port of Seattle 
Date Submitted:

Site Map 
POS SEPA No 12-03 
South Riverside Drive 
Rehabilitation Project 
June 5, 2012 
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POS SEPA No 12-03 
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June 5, 2012 
Page 22 of 23 

ATTACHMENT 1  GREENHOUSE GAS (GHG) EMMISSIONS WORKSHEET 
Supplemental Information for SEPA Environmental Checklist 

GHG Emission        What sources are likely from the
Sources                  proposal?             What is the quantitative or qualitative    What available mitigation will avoid or
(CO2, CH4, N2O, HFCs,  List specific type of activities, and duration     assessment of those emissions?           reduce those emissions? 
PFCs, SF6)i                 of emissions 
On-Road Mobile Sources 
Non-Road Mobile Sources 
Stationary Combustion 
Industrial Processes 
Fugitive Emissions 
Agricultural Emissions 
Land Disturbance 
Purchased Electricity and
Steam 
Construction 
Extraction of Purchased
Materials 
Processing of Purchased
Materials 
Transportation of
Purchased Materials 
Employee Commute

POS SEPA No 12-03 
South Riverside Drive Rehabilitation Project 
June 5, 2012 
Page 23 of 23 

GHG Emission        What sources are likely from the
Sources                  proposal?             What is the quantitative or qualitative    What available mitigation will avoid or
(CO2, CH4, N2O, HFCs,  List specific type of activities, and duration     assessment of those emissions?           reduce those emissions? 
PFCs, SF6)i                 of emissions 
Other Mobile Emissions 
Water Use and Wastewater
Disposal 
Waste Management 
Product Use 

Landfills, production and distribution of natural gas & petroleum, fermentation from the digestive system of
CH4           Methane 
livestock, rice cultivation, fossil fuel combustion, etc. 
N2O           Nitrous Oxide        Fossil fuel combustion, fertilizers, nylon production, manure, etc. 
HFC's          Hydrofluorocarbons     Refrigeration gases, aluminum smelting, semiconductor manufacturing, etc. 
PFC's           Perfluorocarbons       Aluminum production, semiconductor industry, etc. 
SF6              Sulfur Hexafluoride      Electrical transmissions and distribution systems, circuit breakers, magnesium production, etc.