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Pump Station Ventilation Upgrades Project SEPA Environmental Checklist

SEPA Checklist Pump Station Ventilation Upgrades 020618.docx February 6, 2018

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SEATTLE PUBLIC UTILITIES SEPA ENVIRONMENTAL CHECKLIST

This SEPA environmental review of Seattle Public Utilities’ Pump Station Ventilation Upgrades Project (Pump Stations 17, 20, 48, 49, 51, and 67) has been conducted in accord with the Washington State Environmental Policy Act (SEPA) (RCW 43.21C), State SEPA regulations [Washington Administrative Code (WAC) Chapter 197-11], and the City of Seattle SEPA ordinance [Seattle Municipal Code (SMC) Chapter 25.05].

A. BACKGROUND

1. Name of proposed project:

Pump Station Ventilation Upgrades Project – Pump Stations 17, 20, 48, 49, 51, and 67

2. Name of applicant:

Seattle Public Utilities

3. Address and phone number of applicant and contact person:

Arnel Valmonte, Project Manager Seattle Public Utilities Project Delivery & Engineering Branch Seattle Municipal Tower, Suite 4900 P.O. Box 34018 Seattle, WA 98124-4018 (206) 615-1438 [email protected]

4. Date checklist prepared:

February 6, 2018

5. Agency requesting checklist:

Seattle Public Utilities (SPU)

6. Proposed timing or schedule (including phasing, if applicable):

Construction is scheduled to occur between July 2018 and July 2019. The construction duration is expected to be 15 working days at Pump Station 20; 11 working days each at Pump Stations 17, 49, 51, and 67; and six working days at Pump Station 48.

7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain.

The proposed project would upgrade the ventilation systems at six existing wastewater pump stations that are connected to sewer lines greater than 12 inches in diameter. For efficiency, SPU plans to bundle the work at these six pump stations into a public works construction contract that will also construct ventilation system upgrades at 22 other wastewater pump stations. These additional 22 pump stations are connected to sewer lines that are 12-inches or less in diameter. Work at the 22 pump stations is not addressed in this SEPA checklist because it is exempt from a SEPA threshold determination per Seattle Municipal Code (SMC 25.05.800, subsections X.2 and X.5).

mailto:[email protected]



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With the exception of Pump Stations 20 and 67, none of the pump station upgrades depend upon the construction of other pump station upgrades to meet the project’s operational objectives. Pump Stations 20 and 67 share some common electrical infrastructure, and upgrades at both of those sites must be constructed concurrently for the project improvements to function properly. Another SPU project called the Portage Bay (Basin 138) Gate Retrofit Project is proposed in the vicinity of Pump Stations 20 and 67. The Portage Bay Gate Retrofit Project is a separate project and will have its own SEPA review. SPU may construct the ventilation upgrades at Pump Stations 20 and 67 at the same time as the Portage Bay Gate Retrofit Project to reduce the potential for construction-related neighborhood disruption and to provide for more efficient site restoration following construction.

8. List any environmental information you know about that has been prepared, or will be prepared,

directly related to this proposal.

No environmental information has been prepared or will be prepared for this proposal.

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.

Besides the proposed work, there are no known pending applications related to the facilities covered by this proposal.

10. List any government approvals or permits that will be needed for your proposal, if known.

All pump stations, as applicable under Seattle Municipal Code: City of Seattle Mechanical and Electrical Permits. Pump Stations 20, 49, and 67: City of Seattle Street Use/Right of Way Permit Pump Stations 20, 48, 49, 51, and 67: City of Seattle Shoreline Substantial Development Permit (SSDP) or SSDP Exemption.

11. Give a 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.

Seattle Public Utilities (SPU) owns and operates a wastewater collection system that serves the City of Seattle. The system includes pump stations located throughout the City. Pump stations are structures (typically located partially or wholly below ground) that house pumps, piping, valves, and auxiliary equipment used to convey wastewater. The majority of SPU’s pump station structures are configured into separate, divided chambers, referred to as “wet wells” and “dry wells”. The wet well is the portion of the pump station that serves as a receiving area or holding sump for wastewater that flows into the pump station, and the area from which the pump station’s pump draws suction. The dry well is the portion of the pump station that typically houses the pump motor, pump station monitoring and control systems, and other equipment. During normal pump station operation, wastewater is fully contained within piping, valves, and pumps as it passes through the dry well portion of the pump



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station. Pump stations are equipped with ventilation systems that are designed to prevent the build-up of combustible fumes, prevent corrosion and other conditions that damage or affect the operational reliability of equipment, and maintain safe conditions for worker entry. A typical pump station ventilation system schematic diagram is shown in Figure 1. A system-wide evaluation conducted in 2015 determined that ventilation systems currently in place at a number of SPU wastewater pump stations are inadequate and do not comply with the current provisions of the National Electric Code (NEC) and the National Fire Protection Association (NFPA) Standard 820. The NFPA Standard establishes minimum ventilation and fire protection requirements for wastewater treatment and collection facilities. The current ventilation deficiencies result in increased risks to worker safety during routine pump station operation and maintenance activities, and to the longevity and service reliability of pump station equipment. SPU proposes to upgrade pump station ventilation systems at the six wastewater pump stations described in this Checklist to ensure a safe and reliable working environment for equipment and SPU personnel, and to bring pump station ventilation systems into compliance with National Fire Protection Association and National Electric Code standards. The proposed upgrades are listed below. Proposed project elements for each project site generally fall under one or more of the following categories: dry well ventilation upgrades, wet well ventilation upgrades, and pump station access modifications. The general project elements of each category are listed below, followed by a more specific listing of work to be accomplished at each project site. Dry Well Ventilation Upgrades (All Pump Stations) The following dry well ventilation upgrades will be included for all six pump stations:

• Installation of new dry well supply and exhaust fans, sufficient for at least 6 air changes per hour at a nominal positive pressurization.

• Construction of new ventilation exhaust stacks, ducts, and electrical conduits internal and external to the existing pump station structure.

• Sealing of existing electrical conduits and wall penetrations between wet well and dry well to be gastight.

• Ventilation flow monitor and SCADA upgrades internal to the pump station structure.

Wet Well Ventilation Upgrades and Access Modifications (Pump Station 20 only) In addition to dry well ventilation upgrades, the following wet well upgrades and worker access modifications will be included at Pump Station 20:

• Installation of new wet well supply and exhaust fans sufficient for at least 12 wet well air changes per hour at a nominal negative pressurization.

• Construction of new ventilation exhaust stacks, ducts, and electrical conduits internal and external to the existing pump station structure.

• Ventilation flow monitor and SCADA upgrades internal to the pump station structure.

• Installation of explosive gas detector in pump station wet well.

• Sealing off existing internal access opening between wet well and dry well.

• Construction of a new physically separate, external access door to the existing wet

well.



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The following is a more detailed listing of the project improvements to be constructed, and is organized in two groups for each site: the work/improvements that are internal to the existing pump station structure, and those that are external to the pump station structure:

Wastewater Pump Station No. 17

Proposed upgrades at this pump station are associated with dry well ventilation

improvements, and include the following:

Internal to existing pump station structure:

• Removal of existing ventilation fan, ductwork, and associated electrical cabling and

conduits;

• Construction of new ventilation ducts, electrical cabling, and conduits;

• Installation of a new ventilation fan (dry well exhaust);

• Sealing off openings around electrical conduits and other wet well/dry well wall

penetrations;

• Installation of air flow monitoring equipment and upgrades to SCADA components.

External to existing pump station structure:

• Removal of existing dry well vent riser;

• Construction of concrete pads for new above-ground fan, and wet well exhaust vent

riser;

• Construction of new below-grade ventilation ducts, a new dry well exhaust riser,

electrical cabling, and conduits;

• Installation of a new above-ground ventilation fan (dry well supply) and associated

weatherproof enclosure.


Proposed upgrades at this pump station include dry well ventilation improvements, wet well

ventilation improvements, and worker access structural modifications, and include the

following:


• Removal of existing ventilation fans, ductwork, and associated electrical cabling and

conduits;


• Installation of four new ventilation fans (dry well supply, dry well exhaust, wet well

supply, and wet well exhaust);


penetrations;

• Installation of air flow and combustible gas monitoring equipment, and SCADA

components.



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• Construction of concrete pad for new dry well vent riser;

• Construction of new ventilation riser;

• Installation of new dry well exhaust weather hood on pump station exterior;

• Construction of a new pump station exterior wall section, wet well access door and

stairs, and dry well maintenance hatch.






conduits;


• Installation of two new ventilation fans (dry well supply and exhaust);


penetrations;



• Construction of concrete pad for new dry well vent riser;

• Construction of new ventilation duct and riser.






conduits;




penetrations;



• Removal of two existing dry well vent risers;

• Construction of concrete pads for new above-ground fan and new dry well vent riser;

• Construction of new ventilation duct and riser, electrical cabling, and conduits;





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conduits;




penetrations;



• Removal of an existing dry well vent riser;

• Construction of concrete pad for new above-ground fan;

• Construction of new ventilation duct, electrical cabling, and conduits;








conduits;




penetrations;



• Removal of an existing dry well vent riser;

• Construction of concrete pad for new above-ground fan;

• Construction of new ventilation duct, electrical cabling, and conduits;





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Site Restoration (All Pump Stations) Excavation, grading, and filling will be necessary to construct the proposed pump station upgrades and restore each site. Once the pump station improvements have been completed, excavated areas would be backfilled and areas of surface disturbance would be restored. When disturbed area is located within a public street right-of-way, all damaged or demolished street panels, curbs, sidewalks, and traffic aprons would be restored consistent with Seattle Department of Transportation (SDOT) requirements. Other disturbed paved surfaces would be replaced in-kind. Parking strip vegetation would be replaced in-kind, or as required by SDOT requirements, if different. Vegetation removed for project construction in areas outside of public rights of way would be replaced in-kind.

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, and 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 project would upgrade pump station ventilation systems at six wastewater pump stations in the following locations:

Pump Station Address Township, Range, Section Pump Station 17 410 S Norfolk St Township 23 North, Range 04 East, Section 03

Pump Station 20 1205 E Shelby St Township 25 North, Range 04 East, Sections 17 & 20

Pump Station 48 3701 Brooklyn Ave NE Township 25 North, Range 04 East, Section 17

Pump Station 49 3720 Latona Ave NE Township 25 North, Range 04 East, Section 17

Pump Station 51 6666 NE 60th St Township 25 North, Range 04 East, Section 11

Pump Station 67 1350 E Shelby St Township 25 North, Range 04 East, Section 17

Attachment A also summarizes the following location information for each project site: pump station number, a physical address for the general site vicinity, and the names of the public street(s) that provide access to the site. In addition, a project vicinity map is provided as Attachment B, and a location map and site plan for each project site is provided in Attachment C.

B. ENVIRONMENTAL ELEMENTS

1. Earth

a. General description of the site: [Check the applicable boxes]

Flat Rolling Hilly Steep Slopes Mountainous

Other: (identify)



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b. What is the steepest slope on the site (approximate percent slope)?

Most of the project sites have flat to gently sloping terrain. Some are located near steeper slopes of up to 40 percent. (See Checklist Section B.8.h for further information regarding sites located near mapped Steep Slope areas.)

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 agricultural land of long-term commercial significance and whether the proposal results in removing any of these soils.

The general geologic condition of the Puget Sound region is a result of glacial and non-glacial activity that occurred over the course of millions of years. Review of the geologic map covering the project location (Troost et al. 2005, available at http://pubs.usgs.gov/of/2005/1252/ ) indicates that the 6-site project area is underlain primarily by Vashon till, advance outwash deposits, and Lawton clay (member of Vashon drift). Glacial till is a mix of poorly sorted silt, sand, and sub-rounded to well-rounded gravels and cobbles that are transported by the glacier and deposited under the ice resulting in a very dense to over consolidated deposit. Advance outwash consists of well sorted sand and gravel that was transported by meltwater channels emanating from the toe of the advancing glacier and subsequently overridden by the glacier. Lawton clay consists of laminated to massive silt, clayey silt, and silty clay. However, urban development and buried utility construction at and near the project sites over the last 100 years has resulted in a predominance of disturbed native soils/sediments, cut slopes, and large placements of fill material.

d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe:

Soil stability is likely to vary from location to location. It is possible that unstable soils could be found on steep slopes, and at sites that are in or contain areas mapped as liquefaction or settlement hazards. Pump Station 17 is located in an area mapped by the Seattle Department of Construction and Inspections as a Liquefaction Prone area. See Checklist Section B.8.h for more information about geologic environmentally sensitive area designations that have been mapped by the City of Seattle for each site.

e. Describe the purpose, type, total area, and approximate quantities and total affected area of

any filling, excavation, and grading proposed. Indicate the source of fill.

Construction would include excavation, grading, and filling necessary to construct the proposed pump station upgrades and restore each site. The area of ground disturbance would vary at each site, but is not expected to exceed 500 square feet at any one site and in most cases, would be considerably less. Attachment A provides information for each site regarding the approximate volume of excavation/backfill, and the anticipated depth of excavation. Fill materials would include backfill of excavated material (if suitable), sand, crushed rock, asphalt, and concrete. Excess unsuitable excavated materials would be exported from work sites and properly disposed at a location to be approved in advance by SPU.

http://pubs.usgs.gov/of/2005/1252/



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f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe:

Erosion and sedimentation could occur as a result of construction activities, although this risk is low because most project sites are flat or relatively flat; ground disturbance would be minimized; and temporary erosion and sediment control best management practices would be deployed, inspected, and maintained as needed.

g. About what percent of the site will be covered with impervious surfaces after project

construction (for example, asphalt or buildings)?

The project sites at Pump Stations 17, 49, and 51, are predominantly vegetated and unpaved, and no existing paving would be disturbed at those sites. The project sites at Pump Stations 48, and 67 also predominantly consist of vegetated and unpaved surfaces; however, up to 27 square feet of existing paved sidewalk would be disturbed at Pump Station 48, and up to 54 square feet of existing concrete stairs and walkway would be disturbed at Pump Station 67. The project site at Pump Station 20 predominantly consists of paved walkway and stairs, and up to 100 square feet of existing paved area would be disturbed at that site. At Pump Stations 48 and 67, existing paved surfaces damaged and demolished by construction would be repaired or replaced in-kind. At Pump Station 20, up to 100 square feet of disturbed concrete walkway would be restored with temporary pavers. The pavers would remain in place until the Portage Bay Gate Retrofit Project is constructed, at which time the latter project would permanently restore the concrete walkway. Construction of the project would create a small amount (less than 50 square feet) of new impervious surface at each pump station. Attachment A provides information for each site regarding the type of ground cover to be disturbed and restored, and the area of any new impervious surfaces.

h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any:

No filling or excavation would take place in watercourses or wetlands, and stormwater control Best Management Practices would be used to protect the existing stormwater drainage systems and to minimize erosion and sedimentation. Best Management Practices as identified in the City of Seattle’s Stormwater Code found at SMC Title 22, Subtitle VIII, City of Seattle Director’s Rule SDCI 17-2017/SPU DWW-200, and Volume 2 Construction Stormwater Control Manual, would be used to manage stormwater runoff, construction disturbance, and erosion as needed during construction. All work would be required to be performed consistent with an approved construction stormwater and erosion control plan (CSECP).



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2. Air

a. What types of emissions to the air would result from the proposal [e.g., dust, automobile, odors, industrial wood smoke, greenhouse gases (GHG)] during construction, operation, and maintenance when the project is completed? If any, generally describe and give approximate quantities if known.

Air Quality and Odors During project construction, emissions would occur from vehicles and equipment at the site, such as crew vehicles, trucks, and construction equipment. Emissions would include carbon monoxide, reactive organic gases, and nitrogen oxide. Also, airborne dust particles may result from construction activities. Upon the completion of project construction activities, emissions related to construction would cease. During normal pump station operation, wastewater in the dry well portion of the pump station is fully contained within piping, valves, and pumps and is not exposed to the air inside the drywell, thereby minimizing or eliminating the potential for the generation of airborne odor producing molecules. Therefore, no increased perception of odors would be expected as a result of the dry well ventilation improvements at all sites. Wastewater at the bottom of pump station wet wells typically does have some exposure to air inside the wet well. The wet well ventilation improvements at Pump Station 20 would increase the rate and volume of air supplied to and exhausted from the wet well, which could potentially result in the emission of odors. However, the generation and transmission of odor producing molecules in outdoor air is determined by many factors, including environmental and atmospheric conditions, physical landscape, and in the case of wastewater pump stations, the chemical composition of the wastewater and the piping configuration and velocity of the wastewater through the pump station. Additionally, the higher ventilation air flow also has the potential to result in a dilution effect associated with reducing the concentration of odor causing molecules in the air within the wet well. To the extent that odor concentration is reduced inside the wet well as a result of the increased air flow resulting from the project, the project improvements could also result in no increase of emitted odors. Greenhouse Gas Emissions Greenhouse gas emissions can be characterized as “direct”- emissions from sources owned or controlled by the reporting entity, and “indirect” - emissions from sources that are a consequence of the reporting entity, but occur at sources owned or controlled at another entity (e.g., electricity purchased to operate facilities and equipment). This checklist provides information regarding the potential for new or increased direct greenhouse gas emissions to result from construction and operation of the project. Estimates of direct greenhouse gas emissions related to construction of the project presented as total metric tons of carbon dioxide (MTCO2e) are noted in Table 1. Please refer to Attachment D for more detailed calculations.



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Operation of the project improvements would result in greater volumes of air being vented to the atmosphere from the pump station dry wells of all six sites, and from the wet well of Pump Station 20. The amount of greenhouse gases in the air exhausted from pump station dry wells is expected to be negligible. Dependent on the concentration of greenhouse gases such as carbon dioxide or methane in the air exhausted from the wet well of Pump Station 20, there is a potential for the incremental increase of greenhouse gas released directly to the atmosphere as a result of the increased wet well ventilation air flow resulting from the project. However, the amount of any greenhouse gas currently being released directly to the atmosphere during operation of Pump Station 20 is not known, and at present there is no widely-accepted general model or methodology for estimating the effect of ventilation, or changes in ventilation, on greenhouse gas emissions associated with direct releases to the atmosphere from wastewater collection and conveyance facilities. Therefore, the magnitude of potential changes in direct greenhouse gas emissions associated with operation of the project has not been estimated. Long-term maintenance of the project improvements would not result in increases in greenhouse gas emissions above current levels. The project upgrades would be constructed at existing, operational wastewater pump stations, and would not result in increases to the frequency or duration of pump station maintenance visits/activities.

Table 1: Summary, Greenhouse Gas (GHG) Emissions for

Construction of Wastewater Pump Station Ventilation Upgrades

Activity/Emission Type

GHG Emissions (pounds of CO2e)1

GHS Emissions (metric tons of CO2e)1

Paving 317 0.14

Diesel Construction Equipment 17,682 8.0

Gasoline Construction Equipment 17,909 8.1

Total GHG Emissions 35,908 16.2

1 Note: 1 metric ton = 2,204.6 pounds of CO2e. 1,000 pounds = 0.45 metric tons of CO2e

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 emissions or odors that would affect the project are known.

c. Proposed measures to reduce or control emissions or other impacts to air, if any:

During construction, impacts to air quality would be reduced and controlled through implementation of federal, state, and local emission control criteria and City of Seattle construction practices. These would include requiring contractors to use best management practices for construction methods, proper vehicle maintenance, and minimizing vehicle and equipment idling.



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For all project sites, the project includes sealing electrical conduits, access openings, and other penetrations to create a gas-tight seal between the pump station wet well and the dry well, which would prevent wet well air and any associated odors from directly entering the dry well and then being exhausted from the dry well to the outside air during pump station operation.

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 so, describe type and provide names. If appropriate, state what stream or river it flows into.

Yes, five of the six pump stations are located within 200 feet of a surface water or wetland as noted below. Information about each waterbody is provided the first time the waterbody appears in this section.

Pump Station 20: Located approximately 25 feet west of Portage Bay, a freshwater embayment within the Lake Washington Ship Canal that is designated as a Shoreline of Statewide Significance.

Pump Station 48: Located approximately 150 feet north of Portage Bay.

Pump Station 49: Located approximately 35 feet north of Lake Union, a freshwater lake that is connected to Puget Sound and Lake Washington by the Lake Washington Ship Canal. Lake Union is considered part of the Lake Washington Ship Canal, and is designated as a Shoreline of Statewide Significance.

Pump Station 51: Located within 15 feet of the western shore of Lake Washington.

Pump Station 67: Located within 10 feet of the southern shore of Portage Bay.

(2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If so, please describe, and attach available plans.

No work is proposed over or in surface waters or wetlands. Work at the above listed sites located within 200 feet of surface waters or wetlands will occur as described in Checklist Item A.11 and shown in Attachments A and C.

(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 fill or dredge material would be placed in or removed from surface waters or wetlands.

(4) Will the proposal require surface water withdrawals or diversions? If so, give general

description, purpose, and approximate quantities if known.

The proposed work would not require surface water withdrawals or diversions.



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(5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan.

The project is not located with a 100-year floodplain.

(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 project does not propose any discharges of waste materials to surface waters. However, several construction activities such as concrete pouring and handling, etc., would generate pollutants that could potentially enter local drainage conveyance systems. Non-sediment pollutants that may be present during construction include:

• Petroleum products including fuel, lubricants, hydraulic fluids, and form oils • Paints, glues, solvents, and adhesives • Concrete and concrete washwater • Chemicals associated with portable toilets.

Procedures to prevent and control pollutants, including hazardous materials such as hydrocarbons and pH-modifying substances, would be described in the Spill Prevention, Control, and Countermeasures Plan to be prepared as part of the project’s Storm Water Pollution Prevention Plan.

b. Ground:

(1) Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well. Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known.

No groundwater withdrawals are planned. If dewatering of excavation areas is necessary during construction, collected water would be managed according to the Spill Prevention, Control, and Countermeasures Plan. Quantities of water potentially collected by dewatering are unknown. No other ground water withdrawals or discharge are anticipated.

(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 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 project would not discharge waste material from septic tanks or other sources into groundwater.

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.

During construction, vegetation clearing and ground disturbance activities could result in short-term, temporary changes to drainage patterns and an increased potential for sedimentation and erosion at the project site. Best Management



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Practices consistent with the City of Seattle Stormwater Code and City of Seattle Stormwater Manual would be used to protect the existing stormwater drainage system, manage construction disturbance and stormwater runoff, and minimize erosion and sedimentation. Increases in stormwater runoff resulting from the completed project are expected to be negligible. The ground surfaces disturbed for project construction would be in existing developed areas and would be replaced in kind upon completion of the pump station upgrades. The project would create some new impervious surfaces associated with the new concrete pads for pump station ventilation fan enclosures and duct risers. However, these pads would have relatively small surface areas, and a number of them would be constructed in areas that are already paved. New impervious surface areas for each project site would range from approximately 4 to 40 square feet, with most sites creating less than 20 square feet of new impervious surfaces. Attachment A provides information on the amount of new impervious surface that would be created at each project site.

(2) Could waste materials enter ground or surface waters? If so, generally describe.

No part of the proposed work involves any discharges of waste materials to surface or ground waters. However, several construction activities such as sawcutting, concrete pouring and handling, etc., would generate pollutants that could potentially enter local drainage conveyance systems. Non-sediment pollutants that may be present during construction include:

• Petroleum products including fuel, lubricants, hydraulic fluids, and form oils • Paints, glues, solvents, and adhesives • Concrete and concrete washwater • Chemicals associated with portable toilets.

Procedures to prevent and control pollutants, including hazardous materials such as hydrocarbons and pH-modifying substances, would be described in a spill prevention, control, and countermeasures plan that would be prepared for the project and approved by the City of Seattle prior to the start of project construction activities.

(3) Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If

so, describe.

Vegetation clearing and ground disturbance activities during construction could result in short-term, temporary changes to drainage patterns and an increased potential for sedimentation and erosion at the project site. The completed project’s effect on local drainage patterns at each project site is expected to be negligible. Most areas of ground disturbance at each site would be replaced in kind, areas of new paved surface would relatively small, and upon the completion of pump station improvements, site grades would be restored to match pre-project conditions.



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d. Proposed measures to reduce or control surface, ground, runoff water, and drainage impacts, if

any:

Prior to starting project construction activities, the following project stormwater pollution prevention plans will be prepared for the project and approved by the City of Seattle:

• Construction Stormwater and Erosion Control Plan

• Tree, Vegetation, and Soil Protection Plan

• Spill Plan

All construction will be performed consistent with the above-listed plans. Best Management Practices as identified in the City of Seattle’s Stormwater Code found at SMC Title 22, Subtitle VIII, City of Seattle Director’s Rule SDCI 17-2017/SPU DWW-200, and Volume 2 Construction Stormwater Control Manual, would be used to manage stormwater runoff, construction disturbance, and erosion/sedimentation as needed during construction. The selection, placement, and maintenance of site stormwater Best Management Practices and Temporary Erosion and Sedimentation Control measures would be required to be performed by, or under the supervision of, a Certified Erosion and Sedimentation Control Lead (CESCL). Most areas of ground disturbance at each site would be replaced in kind, areas of new impervious (paved) surface would be relatively small, and upon the completion of pump station improvements, site grades would be restored to match pre-project conditions. No post-construction measures are proposed because operation of the pump station ventilation upgrades is not expected to generate any new surface, ground, runoff water, or drainage impacts.

4. Plants

a. Types of vegetation found on the site: [check the applicable boxes]

Deciduous trees: Alder Maple Aspen Other: (identify) Evergreen trees: Fir Cedar Pine Other: (identify) Shrubs Grass Pasture Crop or grain

Orchards, vineyards, or other permanent crops Wet soil plants: Cattail Buttercup Bulrush Skunk cabbage Other: (identify) Water plants: water lily eelgrass milfoil Other: (identify) Other types of vegetation: (identify)



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b. What kind and amount of vegetation will be removed or altered?

All but one of the pump stations are located in areas consisting predominantly of impervious surfaces such as paved streets, curbs, sidewalks, parking areas, or walking paths. However, construction at some sites could require the removal of grass, shrubs, and other ornamental vegetation. The area of vegetation disturbance is not expected to exceed 200 square feet at any of these sites, and in most cases, would be considerably less. Pump Station 51 is located in an area predominantly vegetated with planted grass and ornamental shrubs; however, the area of vegetation removal and disturbance at this site is also not expected to exceed 200 square feet. Plant removal, pruning, and other vegetation disturbance would be limited to the minimum required to accomplish project construction. No trees would be removed.

c. List threatened or endangered species known to be on or near the site.

According to a review of the Washington Department of Natural Resources (WDNR) Natural Heritage Program’s document called “Sections that Contain Natural Heritage Features, Current as of February 6, 2017” (available at www.dnr.wa.gov ), there are no documented occurrences of sensitive, threatened, or endangered plant species at or near any of the project sites. All project sites have previously been disturbed for the construction of the sewer system being repaired by this project. Most of the sites have been extensively excavated, filled, paved, and occupied by street, utility, and other constructed features.

d. Proposed landscaping, use of native plants, or other measures to preserve or enhance

vegetation on the site, if any:

Plant removal, pruning, and other vegetation disturbance would be limited to the minimum required to accomplish project construction, and would be conducted in accordance with the approved Tree, Vegetation, and Soil Protection Plan for the project. Construction limits would be clearly and physically delineated by protective construction fencing to prevent unauthorized trespass and collateral damage to nearby vegetation. Planted grass and other ornamental vegetation removed in landscaped areas would be replaced in kind. Roadside vegetation and vegetation removed in unlandscaped areas would be replaced with an appropriate site stabilization seed mix consistent with City of Seattle erosion and sedimentation control Best Management Practices and the City of Seattle Standard Specifications for Road, Bridge and Municipal Construction.

e. List all noxious weeds and invasive species known to be on or near the site.

A review of information maintained by the King County Noxious Weed Program (available at King County iMap interactive online mapping program, http://gismaps.kingcounty.gov/iMap/) did not identify documented occurrence of any noxious weeds on or near the project sites.

http://www.dnr.wa.gov/

http://gismaps.kingcounty.gov/iMap/



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5. Animals

a. List any birds and other animals that have been observed on or near the site or are known to be on or near the site: [check the applicable boxes]

Birds: Hawk Heron Eagle Songbirds Other: (identify) Due to the geographic extent of the project, and the fact that it is

located within the Pacific Flyway migratory corridor, the project area experiences the occurrence of a wide variety of resident and migratory waterfowl, song birds, and raptors. In addition to boxes checked, some commonly observed species include geese, ducks, crows, pigeons, and gulls.

Mammals: Deer Bear Elk Beaver Other:(identify) The geographic extent of the project encompasses the presence and

habitats for a variety of animal species. In addition to boxes checked, commonly observed species include opossums, rabbits, raccoon, skunk, squirrel, rats, mice, and bats.

Fish: Bass Salmon Trout Herring Shellfish Other: (identify)

b. List any threatened or endangered species known to be on or near the site:

Pump Stations 20 and 67 are located within a quarter-township area mapped by the Washington Department of Fish and Wildlife as potential occurrence area for Western Pond Turtle (Actinemys marmorata), a species listed by Washington State as ‘Endangered’. In addition, the following project sites are located within 200 feet of Lake Washington or the Lake Washington Ship Canal: Pump Stations 20, 48, 49, 51, and 67. The following aquatic animal species that are documented to occur or potentially occur in Lake Washington and the Lake Washington Ship Canal are listed as ‘Threatened’ under the federal Endangered Species Act:

• Puget Sound Chinook salmon (Oncorhynchus tshawytscha);

• Puget Sound Steelhead (Oncorhynchus mykiss);

• Bull Trout (Salvelinus confluentus).

c. Is the site part of a migration route? If so, explain.

All the project sites are located in the City of Seattle. Seattle is located within the migratory route of many birds and other animal species and is part of the Pacific Flyway, a major north-south route of travel for migratory birds in the Americas extending from Alaska to Patagonia, South America. Also, Puget Sound, Lake Washington, the Lake Washington Ship Canal, and their associated tributary streams are important water migration routes for many animal species.

d. Proposed measures to preserve or enhance wildlife, if any:

The project would include measures to prevent degradation of fish habitat water quality in surface waters near the project sites as described in Checklist Item B3.d.



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Plant removal, pruning, and other vegetation disturbance would be limited to the minimum required for construction. Construction limits would be clearly and physically delineated by protective construction fencing to prevent unauthorized trespass and collateral damage to nearby vegetation or environmentally sensitive habitats. All removed vegetation would be restored in kind, or as directed by Seattle Department of Transportation for sites located within the public right of way.

e. List any invasive animal species known to be on or near the site.

King County lists the European starling, house sparrow, Eastern gray squirrel, and fox squirrel as terrestrial invasive species for this area (http://www.kingcounty.gov/services/environment/animals-and-plants/biodiversity/threats/Invasives.aspx).

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.

All the project sites are located at existing wastewater pump stations that utilize electricity for pump station operation. The new and replacement ventilation fans, and monitoring and control system improvements installed by the project, will also be electrically powered.

b. Would your project affect the potential use of solar energy by adjacent properties? If so,

generally describe.

The project proposes to install weather-proof enclosures for new fans that are installed above ground. The new fan enclosures would be limited to a height of six and a half (6.5) feet or less. Some adjacent properties could experience brief periods of shading associated with the presence of a new fan enclosure, however the potential occurrence of any shading would be dependent upon multiple factors, including the sun’s solar position, the enclosure’s distance and direction from the adjacent property, and other existing structures or features in the vicinity of the enclosure. Due to the relatively small size of the enclosures, any shading effects to adjacent properties are expected to be minimal.

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:

The project will meet the applicable requirements of the Washington State and City of Seattle Energy Codes. No additional energy conservation measures are proposed.

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:

Small amounts of materials likely to be present at each site during construction include gasoline and diesel fuels, hydraulic fluids, oils, lubricants, solvents, paints, and other chemical products. A spill of one of these chemicals could potentially occur during

http://www.kingcounty.gov/services/environment/animals-and-plants/biodiversity/threats/Invasives.aspx

http://www.kingcounty.gov/services/environment/animals-and-plants/biodiversity/threats/Invasives.aspx



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construction as a result of either equipment failure or worker error. Though unlikely, contaminated soils, sediments, or groundwater could also be exposed during excavation. If disturbed, contaminated substances could expose construction workers and potentially other individuals in the vicinity through blowing dust, stormwater runoff, or vapors. The substances present in wastewater could pose a potential environmental health hazard during construction and operation of the project improvements. The wastewater conveyed by the project pump stations is water that has been used in homes, businesses, or industrial facilities, and in some cases, also includes collected stormwater runoff. It typically consists of a mixture of substances such as human waste, food scraps, oils, soaps, and chemicals. The decomposition of organic household or industrial wastes present in wastewater can produce gases including hydrogen sulfide, ammonia, methane, carbon monoxide, sulfur dioxide, and nitrogen oxides. Many of these gases are heavier than air and tend to settle in low areas. The chemicals potentially present in the wastewater, and the gases they produce, are toxic to humans, and could pose a health risk to workers if exposed during project construction or during routine pump station operation and maintenance activities after construction has been completed. In high enough concentrations, the presence of gases produced by the substances in wastewater can also be flammable, creating a risk of fire or explosion if ignited.

(1) Describe any known or possible contamination at the site from present or past uses.

None of the project sites are known to have environmental contamination. However, it is possible that contamination of soil or groundwater associated with past uses or activities on or near a site may be present.

(2) Describe existing hazardous chemicals/conditions that might affect project development and design. This includes underground hazardous liquid and gas transmission pipelines located within the project area and in the vicinity.

There are no known hazardous chemicals or conditions that might affect project development and design.

(3) Describe any toxic or hazardous chemicals that might be stored, used, or produced during the project’s development or construction, or at any time during the operating life of the project.

Construction activities such as concrete pouring and handling, etc., would generate pollutants that could potentially enter local drainage conveyance systems. Non-sediment pollutants that may be present during construction include:

• Petroleum products including fuel, lubricants, hydraulic fluids, and oils • Paints, glues, solvents, and adhesives • Concrete and concrete washwater • Chemicals associated with portable toilets.

During normal operation of the project improvements, no toxic or hazardous chemicals would be stored at any time at the project sites, however SPU workers may use small quantities of the above items as part of routine operation and maintenance activities.



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During project construction, wastewater flows may be temporarily bypassed around areas of work at each pump station as required to accomplish project work. Upon completion of the project construction, the project would not affect the quantity or composition of wastewater passing through the pump stations. The potential for hazardous chemicals to be produced by or associated with substances present in, or chemical processes occurring in, the wastewater being conveyed through the pump stations, would be the same as prior to construction.

(4) Describe special emergency services that might be required.

Possible fire or medic services could be required during project construction activities, as well as possibly during operation of the sewer system. However, the wastewater system would not demand higher levels of special emergency services than already exist at the project locations.

(5) Proposed measures to reduce or control environmental health hazards, if any:

During construction, the contractor would use standard operating procedures and Best Management Practices identified in the City of Seattle’s Stormwater Code found at SMC Title 22, Subtitle VIII, City of Seattle Director’s Rule SDCI 17-2017/SPU DWW-200, and Volume 2 Construction Stormwater Control Manual to reduce or control possible environmental health hazards. SPU work crews and/or contractors would be required to develop and implement a Spill Plan to control and manage spills during construction. In addition, a spill response kit will be maintained at each site during construction work at that site, and all project site workers will be trained in spill prevention and containment consistent with the City of Seattle’s Standard Specifications for Road, Bridge, and Municipal Construction. Any soil discovered to be contaminated from previous land uses or affected by spills during construction would be excavated and disposed of in a manner consistent with the level and type of contamination, in accordance with federal, state and local regulations, by qualified contractor(s) and/or City of Seattle staff. In recognition of the potential fire and explosion hazards associated with wastewater facility environments, the National Fire Protection Association (NFPA) has published NFPA 820, a standard for Fire Protection in Wastewater Treatment and Collection Facilities. In part, the purpose of the proposed project is to improve pump station ventilation systems to ensure a safe working environment for SPU personnel, and to bring pump station ventilation systems into compliance with NFPA 820. The following is a partial list of project features/outcomes to accomplish this (see Checklist Section A.11 for details):

• Upgrading dry well ventilation to meet NFPA standard for a minimum of six

air changes per hour (all project sites);

• Upgrading wet well ventilation to meeting NFPA standard for a minimum of

12 air changes per hour (Pump Station 20);



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• Installation of explosion-proof fan motors for wet well fans (Pump Station

20);

• Installation of explosive gas detector and air flow monitoring equipment

(Pump Station 20); and

• Sealing electrical conduits and other penetrations between pump station wet

wells and dry wells to create a gas-tight seal (all pump stations).

To ensure workers are not exposed to harmful substances that can be present in wastewater or unsafe concentrations of wastewater gases or vapors during project construction, wastewater flows will be bypassed around each pump station as needed to facilitate project work in and on the pump station structure. Additionally, workers will be required to follow the Washington State safety standards for entry and work in confined spaces (Chapter 296-809 of the Washington Administrative Code), which includes requirements for atmospheric testing in a confined space structure prior to entry and work within the structure. Following the completion of construction, SPU workers performing routine pump station operation and maintenance activities will be required to follow the requirements of SPU’s Confined Space Safety Program, which implements the requirements of WAC 296-809.

b. Noise

(1) What types of noise exist in the area which may affect your project (for example: traffic,

equipment, operation, other)?

There are no known noises that exist on or near the project sites that would affect the project.

(2) What types and levels of noise would be created by or associated with the project on a

short-term or a long-term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site.

During construction, short-term noise would be generated at the project sites from construction equipment (for example truck traffic, backhoe, etc.). Noise generating construction work would be limited to the allowable maximum levels provided by Seattle Municipal Code (SMC) section 25.08.425. In general, it is expected that most noise-generating construction activities would take place between the hours of 7 a.m. and 6 p.m. on weekdays. However, in the event SPU determines that project work is required outside of the hours allowed outright under the City’s noise regulations, SPU would seek a noise variance or exemption consistent with City of Seattle noise regulations. Short-term noise impacts would end upon the completion of construction work at each site. During operation of the project, noise would be generated from the new ventilation fans and the air flow through the new and modified vent ducting. The project would replace existing electric ventilation fans at each of the project sites with new, higher capacity (larger) fans. At some sites, additional fans would also be installed. The new fans to be installed would all be rated up to a speed of 1,725 revolutions per minute (RPM), and would range in size (power rating) from 0.25 horsepower (HP) to 0.5 HP.



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The existing fans at the project pump station sites currently operate continuously during normal operation, and as with the existing fans being replaced, the new fans would be electrically powered and would operate continuously during normal operation. Most new fans would be located below-ground, within the pump station structure. Four new fans at Pump Stations 17, 49, 51, and 67 would be located above-ground, outside of the pump station structure as noted in Checklist Item A.11. All new fans would have a maximum noise rating of 50 dB. In addition, the four new above ground fans at Pump Stations 17, 49, 51, and 67 would be installed within acoustically-lined, weather-proof enclosures that would provide a minimum noise reduction of 15 dB.

(3) Proposed measures to reduce or control noise impacts, if any:

Construction of the project will comply with the requirements of applicable noise control laws and regulations addressing maximum noise levels, and the days/hours during which noise-generating construction work is allowed, including the Washington State Noise Control Act of 1974 (70.107 RCW), the implementing Maximum Environmental Noise Level regulations adopted by the Washington State Department of Ecology (Chapter 173-60 WAC), and City of Seattle Noise Control regulations (Seattle Municipal Code Chapter 25.08). The project includes design features to limit noise generated by the upgraded ventilation system. New fans installed by the project would have a maximum noise rating of 50dB, and all the four new fans installed above-ground would be installed within acoustically-lined, weather-proof enclosures designed to reduce fan noise by a minimum of 15 dB. Operation of the project improvements would comply with the City of Seattle Noise Ordinance (SMC 25.08) and the Washington State Maximum Environmental Noise Levels (Chapter 173-60 WAC).

8. Land and Shoreline Use

a. What is the current use of the site and adjacent properties? Will the proposal affect current land uses on nearby or adjacent properties? If so, describe.

The current land uses of the project sites are as follows: Pump Stations 20, 49, and 67 are located within public street rights of way; Pump Stations 17 and 51 are located on SPU-owned utility properties; and Pump Station 48 is located on a portion of a public educational institution property (University of Washington). The predominant land uses adjacent to the project sites are listed below:

Pump Stations 17, 49: commercial

Pump Stations 20, 67: single-family and live-aboard residential

Pump Station 48: educational institution (public university)

Pump Station 51: single-family residential and private park



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Project construction could result in short-term, temporary street lane and sidewalk closures, and/or route detours for streets or sidewalks in the vicinity of the project that would be experienced by individuals who live, work, or visit destinations near project sites. Additionally, project construction could result in short-term, temporary impacts to the access and use of nearby parks, formal and informal trails and open space areas, and street end shoreline access locations.

Operation of the completed project improvements is not expected to affect current land uses on nearby or adjacent properties.

b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses as a result of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use?

None of the pump station sites have been recently used for agricultural or forestry purposes or are classified as agricultural or forest lands. The project would not convert any farm lands or forest lands to other uses.

(1) Will the proposal affect or be affected by surrounding working farm or forest land normal business operations, such as oversize equipment access, the application of pesticides, tilling, and harvesting? If so, how?

The proposed project sites are not located on or near working farm or forest lands, therefore the project would not affect or be affected by working farm or forest land business operations.

c. Describe any structures on the site.

The project sites are locations of existing wastewater pump stations, associated sewer system infrastructure, and other buried and above ground utilities. There are no other buildings or structures located on the project sites.

d. Will any structures be demolished? If so, what?

The project does not propose to demolish any structures.

e. What is the current zoning classification of the site?

The generalized zoning designations for the project sites are as follows:

Pump Stations 20, 51, 67: Single-family Residential

Pump Stations 17, 49: Manufacturing/Industrial

Pump Station 48: Major Institution

f. What is the current comprehensive plan designation of the site?

The City of Seattle Comprehensive Plan Future Land Use Map designation for the project sites are as follows:

Pump Stations 20, 51, 67: Single-family Residential

Pump Stations 17, 49: Industrial

Pump Station 48: Major Institution



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g. If applicable, what is the current shoreline master program designation of the site?

Five of the six project sites are located within City of Seattle Shoreline Master Program jurisdiction. The shoreline master program environmental designations for these sites are as follows:

Pump Stations 20, 51, 67: Urban Residential

Pump Station 48: Urban Commercial

Pump Station 49: Urban Maritime

h. Has any part of the site been classified as an “environmentally critical” area? If so, specify.

Three of the project sites are located in or near one or more environmentally critical areas mapped by the City of Seattle Department of Construction and Inspections as follows:

Pump Station 17: Located in mapped Liquefaction-Prone Area and near (approximately 35 feet southwest of) mapped Steep Slope area.

Pump Station 20: Located in mapped Steep Slope area.

Pump Station 67: Located immediately adjacent to (east of) mapped Steep Slope area. i. Approximately how many people would reside or work in the completed project?

No people would reside or work in the completed project. j. Approximately how many people would the completed project displace?

The project would not displace any people. k. Proposed measures to avoid or reduce displacement impacts, if any:

There would be no displacement impacts. l. Proposed measures to ensure the proposal is compatible with existing and projected land uses

and plans, if any:

The project would be compatible with existing and projected land uses and plans. m. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term

commercial significance, if any:

The project sites are not located on or near agricultural or forest lands of long-term commercial significance, therefore there would not be any impacts to these lands.

9. Housing

a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing.

The project would not construct any housing units.



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b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing.

The project would not eliminate any housing units.

c. Proposed measures to reduce or control housing impacts, if any:

No measures are proposed because there would be no housing impacts.

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?

The project proposes to construct ventilation system improvements at each of the project sites. Most of these improvements are located within the interior of existing pump station structures, or located at or below the existing ground surface at each site. Project elements that would be above ground include new above-ground fans and enclosures, and new or modified vent riser ducts and vent caps. The heights of new above-ground fan enclosures would vary. Most new fans would be installed within the existing pump stations structures. The four new dry well fans that would be installed above ground (Pump Stations 17, 49, 51, and 67) would be located within new weather-proof fiberglass fan enclosures that would be up to 6.5 feet in height, and up to 2.5 feet in width on each side. The above-ground fan enclosures would be constructed of fiberglass. New or altered above-ground riser ducts and vent caps would generally consist of stainless steel or ductile iron material, and would range from 6 to 10 inches in diameter. For the four sites with new or modified riser ducts, the maximum height would be 10 feet at Pump Station 49, and 3.5 feet at Pump Stations 17, 20 and 48.

b. What views in the immediate vicinity would be altered or obstructed?

Pump Stations 17 and 49 are located within fenced or walled utility sites and there would be no revisions to these fences or walls. The new above-ground fan/enclosure at Pump Station 51 would be visually screened from the neighboring properties by an existing on-site hedge and other vegetation, and the new above-ground fan at Pump Station 67 would also be screened from adjacent properties by existing fencing and vegetation. The new above-ground fan at Pump Station 51 would be visible to users of the private lakefront park property and dock adjacent (east of) the site. No views are expected to be obstructed by the project improvements at any of the project sites.

c. Proposed measures to reduce or control aesthetic impacts, if any:

The proposed projects’ above-ground improvements would be screened from neighboring properties by existing fencing and vegetation as described in Sections B.10.a and B.10.b. No additional measures are proposed to reduce or control aesthetic impacts.



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11. Light and Glare

a. What type of light or glare will the proposal produce? What time of day would it mainly occur?

The constructed project would not produce light or glare. No new street lights are proposed.

b. Could light or glare from the finished project be a safety hazard or interfere with views?

The project would not create light or glare.

c. What existing off-site sources of light or glare may affect your proposal?

There are no existing off-site sources of light and glare that would affect the proposal.

d. Proposed measures to reduce or control light and glare impacts, if any:

No measures are needed to reduce or control light and glare impacts because no impacts would occur.

12. Recreation

a. What designated and informal recreational opportunities are in the immediate vicinity?

The below listed project sites are located in or near recreational areas as follows:

Pump Stations 20 and 67: Located within the E Shelby St right of way, immediately adjacent to the western shoreline of Portage Bay. A public walkway and stairs within the right of way provide access to the shoreline, and the Seattle Shoreline Street Ends map designates this location as a point for public access to the Portage Bay shoreline.

Pump Station 48: Located across NE Boat St from (approximately 60 feet north of) Portage Bay Park, and immediately adjacent to (west of) Brooklyn Ave NE which is mapped by the City of Seattle as a designated bicycle facility and has marked bicycle lanes on both sides of the street.

Pump Station 49: Located within the Latona Ave NE right of way immediately adjacent to the shoreline on the north shore of Lake Union. The Seattle Shoreline Street Ends map designates the Latona Ave NE right of way as a shoreline public viewing location, and an existing paved sidewalk and guard rail approximately 30 feet south of the pump station provide public viewing opportunities of the Lake Union shoreline.

Pump Station 51: Located immediately adjacent to and located between two Windermere Beach Club parcels that provide private shoreline access to Lake Washington, at the east end of NE 60th St.

In addition, most of the project sites are located within or accessed directly via paved streets and/or sidewalk areas that provide informal opportunities for walking, running, and bicycling.



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b. Would the proposed project displace any existing recreational uses? If so, describe.

The proposed work would not permanently displace any existing recreational uses. Project construction activities could result in short-term, temporary impacts to access and use of nearby parks, formal and informal trails and open space areas, and street end shoreline access locations. Project construction activities would result in short-term temporary lane closure and detour impacts to the use of the affected streets, and potentially the adjacent sidewalks, by walkers, runners, and bicyclists.

c. Proposed measures to reduce or control impacts on recreation, including recreation

opportunities to be provided by the project or applicant, if any:

SPU will take the following measures to avoid or reduce projects impacts on recreation facilities and activities:

• Coordinate all project work affecting public parks and trails in advance with the

City of Seattle Parks and Recreation Department;

• Coordinate project work at Pump Station 51 in advance with the owner or

owner’s representative of the adjacent Windermere Beach Club property;

• Coordinate all project work affecting streets and sidewalks, including designated

Street End Shoreline access locations, in advance with the Seattle Department of

Transportation (SDOT);

• Comply with required SDOT Street Use Permits issued for the project;

• Plan and manage the construction activities at each project site to make any

necessary closures and detours as brief as possible;

• Ensure that safe pedestrian and bicycle routes are maintained at all times

consistent with approved street use permits, and traffic control plans; and

• Place temporary project signs along affected streets and sidewalks prior to

project construction at each site to provide local residents with advance notice

regarding temporary street and sidewalk closures and detours.

13. Historic and Cultural Preservation

a. Are there any buildings, structures, or sites, located on or near the site that are over 45 years old listed in or eligible for listing in national, state, or local preservation registers? If so, specifically describe.

The project proposes to upgrade ventilation systems at six below-ground wastewater pump stations (6 project sites). The pump station structures at Pump Stations 20, 49, 51, and 67 are older than 45 years, and were constructed in 1949, 1960, 1961, and 1965, respectively. In addition, there are numerous residential and commercial buildings over 45 years old located in the vicinity of these sites, most of which have not been evaluated for cultural/historic significance. However, aside from the SPU pump stations to be upgraded by the project, no buildings or structures would be disturbed by the project. All six project sites were checked against the registers listed in Item B.13.c below. None of these registers recorded any places or objects listed on, or proposed for, national, state, or local preservation registers located on or adjacent to the project sites.



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b. Are there any landmarks, features, or other evidence of Indian or historic use or occupation?

This may include human burials or old cemeteries. Are there any material evidence, artifacts, or areas of cultural importance on or near the site? Please list any professional studies conducted at the site to identify such resources.

According to the information sources listed in Item B.13.c below, there are no archaeological or cultural resources that have been documented to exist on or near the project sites.

c. Describe the methods used to assess the potential impacts to cultural and historic resources on or near the project site. Examples include consultation with tribes and the Department of Archaeology and Historic Preservation, archaeological surveys, historic maps, GIS data, etc.

To determine if any project sites are located on or near properties listed, or documented to be eligible for listing, on federal, state, or local cultural/historical registers, the project sites were checked against the following registers between October 1, 2017, and December 31, 2017:

• Washington Information System for Architectural & Archaeological Research

Data (WISAARD), maintained by the Washington State Department of

Archaeology & Historic Preservation (found at

https://fortress.wa.gov/dahp/wisaardp3/)

• Landmark List, and Map of Designated Landmarks, maintained by the City of

Seattle, Department of Neighborhoods (found at

http://www.seattle.gov/neighborhoods/programs-and-services/historic-

preservation/landmarks)

d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and disturbance to

resources. Please include plans for the above and any permits that may be required.

The proposed work is located predominantly inside of, or in shallow fills above, existing below-ground wastewater utility pump stations, or in developed street rights of way or other areas that have been previously disturbed and filled to construct/install the existing sewer system pump stations and associated piping, as well as other unrelated developments. The work’s location on previously disturbed and filled ground reduces the chance of encountering contextually significant archaeological materials. A cultural resources inadvertent discovery plan would be developed for the project prior to the start of ground-disturbing construction activities, and work crews would be trained to recognize archaeological materials should they be discovered. Should evidence of cultural artifacts or human remains, either historic or prehistoric, be encountered during excavation, work in that immediate area would be suspended and the find would be examined and documented by a professional archaeologist consistent with the procedures in the cultural resources inadvertent discovery plan. Decisions regarding appropriate mitigation and further action would be made at that time.

https://fortress.wa.gov/dahp/wisaardp3/

http://www.seattle.gov/neighborhoods/programs-and-services/historic-preservation/landmarks

http://www.seattle.gov/neighborhoods/programs-and-services/historic-preservation/landmarks



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14. Transportation

a. Identify public streets and highways serving the site or affected geographic area, and describe proposed access to the existing street system. Show on site plans, if any.

Site access would be gained from adjacent public streets. See Attachment A for information regarding the public streets that would be used to access the project sites.

b. Is the site or affected geographic area currently served by public transit? If so, generally

describe. If not, what is the approximate distance to the nearest transit stop?

Yes, the 6-site project area is served by multiple King County Metro public transit routes. The availability and level of service near project sites varies by site. None the of the project sites located within public street rights of way are located in streets traveled directly by Metro bus routes, and project construction is not expected to disrupt bus service or displace any bus stops.

c. How many additional parking spaces would the completed project or nonproject proposal have?

How many would the project or proposal eliminate?

The completed project would neither create nor eliminate any parking spaces, although there may be temporary on-street parking closures during construction activities. The specific timing and duration of parking closures are not known at this time, but such closures would comply with relevant policies administered by the Seattle Department of Transportation as part of the Street Use permitting process.

d. Will the proposal require any new or improvements to existing roads, streets, pedestrian,

bicycle or state transportation facilities, not including driveways? If so, generally describe (indicate whether public or private).

The project would restore all demolished and damaged street panels, curbs, and traffic aprons to pre-construction conditions or better and consistent with City of Seattle Department of Transportation requirements. No new roads or streets would be constructed as part of the project.

e. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air

transportation? If so, generally describe.

The project does not propose to use any water, rail, or air transportation.

Pump Station 49 is located immediately adjacent to (west of) the Alyeska Seafoods marine terminal property at 303 NE Northlake Wy.

f. How many vehicular trips per day would be generated by the completed project or proposal? If

known, indicate when peak volumes would occur and what percentage of the volume would be trucks (such as commercial and nonpassenger vehicles). What data or transportation models were used to make these estimates?

Project work would be performed at existing, un-manned wastewater pump stations, which currently generate infrequent, periodic trips to transport SPU crews, contractors, and equipment to perform visual inspections, maintenance, and repairs when needed. No long-term additional traffic would result from the completed project.



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g. Will the proposal interfere with, affect or be affected by the movement of agricultural and forest products on roads or streets in the area? If so, generally describe.

The proposal would not interfere with, affect, or be affected by the movement of agricultural and forest products on roads or streets in the area.

h. Proposed measures to reduce or control transportation impacts, if any:

Standard construction signs and flagging would be used to ensure worksite safety and reduce any temporary transportation impacts. Access for emergency-response vehicles would be maintained at all times. Project work at each site would comply with the applicable construction traffic management requirements administered by the Seattle Department of Transportation as part of the street use permitting process.

15. Public Services

a. Would the project result in an increased need for public services (for example: fire protection, police protection, public transit, health care, schools, other)? If so, generally describe.

The purpose of the proposed project is to accomplish ventilation system upgrades to existing SPU wastewater pump stations; the project would not create an increased need for public services.

b. Proposed measures to reduce or control direct impacts on public services, if any.

No impacts on public services are anticipated and no mitigation measures are proposed.

16. Utilities

a. Check utilities available at the site, if any: [check the applicable boxes]

None Electricity Natural gas Water Refuse service Telephone Sanitary sewer Septic system Other (fiber optic; cable TV).

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 which might be needed.

None

The proposed project improvements are anticipated to enhance the life, serviceability, and safe operation of critical wastewater infrastructure and would be owned, operated, and maintained by SPU. The proposed improvements would be powered by the existing electrical services at each wastewater pump station, all of which are supplied by Seattle City Light.



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Figure 1 – Typical Pump Station Ventilation Diagram

Source: Pump Station Basis of Design Report, 100% Draft, December 2017



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Attachment A – Summary Table of Project Sites

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Attachment B – Project Vicinity Map



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Attachment C – Project Location Maps and Site Plans Pump Station No. 17

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Attachment D – Greenhouse Gas Emissions Worksheets

Section I: Buildings

Emissions Per Unit or Per Thousand Square

Feet (MTCO2e)

Type (Residential) or Principal Activity (Commercial) # Units

Square Feet (in thousands of square feet) Embodied Energy Transportation

Lifespan Emissions (MTCO2e)

Single-Family Home 0 98 672 792 0

Multi-Family Unit in Large Building 0 33 357 766 0

Multi-Family Unit in Small Building 0 54 681 766 0

Mobile Home 0 41 475 709 0

Education 0.0 39 646 361 0

Food Sales 0.0 39 1,541 282 0

Food Service 0.0 39 1,994 561 0

Health Care Inpatient 0.0 39 1,938 582 0

Health Care Outpatient 0.0 39 737 571 0

Lodging 0.0 39 777 117 0

Retail (Other than Mall) 0.0 39 577 247 0

Office 0.0 39 723 588 0

Public Assembly 0.0 39 733 150 0

Public Order and Safety 0.0 39 899 374 0

Religious Worship 0.0 39 339 129 0

Service 0.0 39 599 266 0

Warehouse and Storage 0.0 39 352 181 0

Other 0.0 39 1,278 257 0

Vacant 0.0 39 162 47 0

TOTAL Section I Buildings 0

Section II: Pavement

Emissions (MTCO2e)

Pavement (sidewalk, asphalt patch) 1.8 0.09

Concrete Pad (50 MTCO2e/1,000 sq. ft. of pavement at a depth of 6 inches) 1.0 0.05

TOTAL Section II Pavement 0.14

Section III: Construction

(See detailed calculations below) Emissions (MTCO2e)

TOTAL Section III Construction 16.1

Section IV: Operations and Maintenance

(See detailed calculations below) Emissions (MTCO2e)

TOTAL Section IV Operations and Maintenance 0.00

TOTAL GREENHOUSE GAS (GHG) EMISSIONS FOR PROJECT (MTCO2e) 16.2



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Attachment D – Greenhouse Gas Emissions Worksheet

Section III Construction Details

Construction: Diesel

Equipment Diesel (gallons) Assumptions

Backhoe/loader (Site 20) 112 1 Backhoe x 4 hours/day x 4 workdays x 7 gal/hour x 1 Site

Backhoe/loader (Sites 17, 49, 51, 67) 336 1 Backhoe x 4 hours/day x 3 workdays x 7 gal/hour x 4 sites

Backhoe/loader (Suite 48) 56 1 Backhoe x 4 hours/day x 2 workdays x 7 gal/hour x 1 site

Dump Truck, 10 Cu Yd (Site 20) 16 1 round trip/day x 4 workdays x 20 roundtrip miles ÷ 5 mpg x 1 site

Dump Truck, 10 Cu Yd (Sites 17, 49, 51, 67) 48 1 round trip/day x 3 workdays x 20 roundtrip miles ÷ 5 mpg x 4 sites

Dump Truck, 10 Cu Yd (Site 48) 8 1 round trip/day x 2 workdays x 20 roundtrip miles ÷ 5 mpg x 1 site

Concrete Truck, 10 Cu Yd (All sites) 48 2 round trips x 20 roundtrip miles ÷ 5 mpg x 6 sites

Truck with Trailer (Site 20) 4 1 round trip x 20 roundtrip miles ÷ 5 mpg x 1 site

Asphalt Truck (Site 20) 4 1 round trip x 20 roundtrip miles ÷ 5 mpg x 1 site

Asphalt Paver (Site 20) 18 1 paver x 4 hours/day x 1 workday x 4.5 gal/hour x 1 site

Asphalt Roller (Site 20) 16 1 paver x 4 hours/day x 1 workday x 4 gal/hour x 1 site

Subtotal Diesel Gallons 666

GHG Emissions in lbs CO2e 17,682 26.55 lbs CO2e per gallon of diesel

GHG Emissions in metric tons CO2e 8.0 1,000 lbs = 0.45359237 metric tons

Construction: Gasoline

Equipment Gasoline (gallons) Assumptions

Pick-up Trucks or Crew Vans (Site 20) 80 4 pickup trucks/vans x 15 workdays x 20 miles/day ÷ 15 mpg x 1 site

Pick-up Trucks or Crew Van (Sites 17, 49, 51, 67)

235 4 pickup trucks/vans x 11 workdays x 20 miles/day ÷ 15 mpg x 4 sites

Pick-up Trucks or Crew Vans (Site 48) 32 4 pickup trucks/vans x 6 workdays x 20 miles/day ÷ 15 mpg x 1 site

Misc. Hand Equipment (Site 20) 90 2 Pcs. of equipment x 10 hours/day x 15 work days x 0.3 gal/hour x 1 site

Misc. Hand Equipment (Sites 17, 49, 51, 67) 264 2 Pcs. of equipment x 10 hours/day x 11 work days x 0.3 gal/hour x 4 sites

Misc. Hand Equipment (Site 48) 36 2 Pcs. of equipment x 10 hours/day x 6 work days x 0.3 gal/hour x 1 site

Subtotal Gasoline Gallons 737

GHG Emissions in lbs CO2e 17,909 24.3 lbs CO2e per gallon of gasoline

GHG Emissions in metric tons CO2e 8.1 1,000 lbs = 0.45359237 metric tons

Construction Summary

Activity CO2e in pounds CO2e in metric tons

Diesel 17,682 8.0

Gasoline 17,909 8.1

Total for Construction 35,591 16.1



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Attachment D – Greenhouse Gas Emissions Worksheet

Section IV Long-Term Operations and Maintenance Details

Operations and Maintenance: Diesel

Equipment Diesel (gallons) Assumptions

Subtotal Diesel Gallons

GHG Emissions in lbs CO2e 26.55 lbs CO2e per gallon of diesel

GHG Emissions in metric tons CO2e 1,000 lbs = 0.45359237 metric tons

Operations and Maintenance: Gasoline

Equipment Gasoline (gallons) Assumptions

Subtotal Gasoline Gallons

GHG Emissions in lbs CO2e 24.3 lbs CO2e per gallon of gasoline

GHG Emissions in metric tons CO2e 1,000 lbs = 0.45359237 metric tons

Operations and Maintenance Summary

Activity CO2e in pounds CO2e in metric tons

Diesel

Gasoline

Total Operations and Maintenance

-- Greenhouse Gas Emissions Worksheet Notes:

1) Construction at the 6 project sites is assumed to require a total of approximately 65 working days;

however, the construction duration at each project site is expected to vary as follows:

Site Expected Construction Duration

Pump Station 20: 15 working days

Pump Stations 17, 49, 51, 67: 11 working days each

Pump Station 48: 6 working days

2) Project improvements would be constructed at existing, operational wastewater pump stations, and

would not result in increases to the frequency or duration of pump station maintenance visits.

Therefore, the project would not result in any increases in greenhouse gas emissions associated with

pump station maintenance trips and activities.

3) Greenhouse Gas Emissions Worksheet does not account for greenhouse gas emissions associated with

the operation of pump station ventilation improvements (see Checklist Section B.2.a).

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