Discussion of the Boeing Creek Basin Plan

Council Meeting Date: January 7, 2013 Agenda Item: 8(c)

CITY COUNCIL AGENDA ITEM CITY OF SHORELINE, WASHINGTON

AGENDA TITLE: Boeing Creek Basin Plan Update DEPARTMENT: Public Works PRESENTED BY: Mark Relph, Public Works Director Jesus Sanchez, Operations Manager Brian Landau, Surface Water and Environmental Service Manager ACTION: ____ Ordinance ____ Resolution ____ Motion _X_ Discussion ____ Public Hearing

PROBLEM/ISSUE STATEMENT: The adopted 2011 Surface Water Master Plan emphasized the role of basin planning to improve the management of the City’s surface water and infrastructure. The City completed its first basin plan for the Thornton Creek basin in 2009. The City is currently conducting basin plans in the Storm Creek and Boeing Creek basins to assess the basin conditions including drainage, erosion, infrastructure condition, water quality, and aquatic habitat. The assessment includes identification of problems and programmatic management actions to address the problems. The programmatic management actions may include capital projects, repair and replacement of infrastructure, improved maintenance, outreach programs or other corrective actions. The final draft Boeing Creek Basin plan report was completed in December 2012. Tonight’s presentation includes the findings of the Boeing Creek Basin Plan and the recommended management actions to address the drainage, infrastructure, water quality, and aquatic habitat issues in the basin.

RESOURCE/FINANCIAL IMPACT: There is no resource or financial impact associated with this discussion. The programmatic management actions identified in the Boeing Creek Basin Plan (draft completed in October 2012) will be prioritized with other management actions identified within the other surface water basin plans in the City and may be proposed in the City’s future Capital Improvement Plan (CIP) budget process. All operational and capital expenditures are funded through the Surface Water Utility Fund.

RECOMMENDATION No action is required at this time. This item is for Council discussion. The basin plan recommended programmatic management actions and associated costs will be prioritized as part of the 2014 CIP process.

Approved By: City Manager -__DT__ City Attorney - __IS/FC__

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INTRODUCTION The City is completing a Boeing Creek Basin Plan to assess conditions in the basin including drainage, erosion, water quality, and habitat. The assessment includes identification of problems and programmatic management actions to address the problems. These programmatic management actions may include capital projects, repair and replacement of infrastructure, maintenance, monitoring, outreach programs, and other potential solutions.

BACKGROUND

The Storm Creek and Boeing Creek Basin Plan studies began in mid-September 2011. The scope of the basin plans is to assess surface water conditions in streams and within buried infrastructure (i.e. pipes and catch basins) so that comprehensive strategies that include maintenance, repair and replacement, capital, and outreach programs can be used to address problems. These problems and management strategies will be prioritized so they can be implemented over a period of time, according to need and resource availability. The basin plans includes specific studies on hydrology and drainage, erosion, water quality, infrastructure condition assessment, and aquatic habitat (i.e. streams and wetlands).

The primary issues in the Boeing Creek basin are related to past development practices that didn’t consider the detrimental effects of increased stormwater flows and flow durations on small streams such as Boeing Creek. Stormwater runoff from intensely developed upland areas on the Aurora Avenue corridor have contributed to instability and erosion in Boeing Creek, as well as water quality concerns. Efforts to mitigate and minimize development-related impacts have occurred over the last several decades with construction of dams, detention facilities and addition of material to stabilize the bed and banks of the creek. The City has addressed most of the major flooding issues in the Boeing Creek basin with implementation of several drainage improvements projects over the last five years, including 3rd Avenue drainage improvements, Pan Terra pond retrofit, Midvale Avenue North drainage improvements, and Darnell Park improvements.

DISCUSSION

The following discussion provides an update on some of the initial findings of the basin plan, including hydrology, infrastructure condition, and water quality,

Basin Hydrologic Analysis

A hydrologic model was developed for Boeing Creek as part of the basin planning effort. Basin geology, topography, land cover (impervious surfaces and vegetation), and historic precipitation records were used as inputs to the model to simulate rainfall-runoff relationships under different sizes of rainfall events. The model was used to identify a preliminary 100-year floodplain boundary for planning purposes only, and identification of potential basin-wide stormwater management issues and solutions.

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Based on a review of service requests for the past 10 years and implementation of projects over the last five years, flooding problems in the Boeing Creek basin have largely been alleviated with one exception. City staff and the City’s 2011 Surface Water Master Plan Update both report a flooding problem in the vicinity of North 175th Street between Dayton Avenue North and Linden Avenue North. Non-chronic flood-related service calls have been primarily due to localized problems, such as debris-clogged catch basins or culverts, rather than system-wide flooding caused by lack of capacity (streams or pipes) to contain large flows. The basin plan includes a map that shows the extent of the 100-year floodplain (Attachment A). This 100-year floodplain analysis will be used to support a Letter of Map Revision to the existing FEMA floodplain for Boeing Creek.

Long-term solutions to reduce peak flows in a largely built-out watershed will require the implementation of retention or infiltrative stormwater management techniques in suitable parts of the watershed in city-owned rights-of-way or as part of redevelopment efforts on large privately owned properties, such as Aurora Square, Crista Ministries, and Shoreline Community College, Shoreline Town Center, and the Interurban Trail corridor (Attachment B). As part of the basin plan study, staff evaluated the effects of implementing stormwater infrastructure retrofits in these areas of the basin. If all of these areas were retrofitted to current stormwater design standards, the result would be an approximate 20 to 25% reduction in peak flows as measured at the mouth of Boeing Creek. Additional flow reductions could be achieved through public works projects within the City’s right-of-way. For example, flow reduction and water quality treatment projects in Thornton Creek watershed include the recently constructed Cromwell Park stormwater wetland detention facility and the grant funded North Fork Thornton Creek LID Stormwater Retrofit Project which will design and construct LID stormwater facilities within the City’s ROW.

This preliminary analysis provides staff with a framework to assess the benefits of stormwater retrofit projects associated with redevelopment within the Boeing Creek basin.

Infrastructure Condition Assessment

The Condition Assessment included inspection of 829 stormwater pipes with a total length of 94,140 feet within the Boeing Creek basin. The condition assessment included an overall conditions rating of the each pipe based on maintenance condition and structural condition. The initial findings indicate 8% of the pipes are in very poor condition and will require replacement within the next five or ten years (Attachment C).

Water Quality

Since 2007, the City has been monitoring water quality at two locations in Boeing Creek. The data indicate the water quality is of low to moderate concern. The primary constituents of concern in Boeing Creek are fecal coliform, dissolved oxygen, and nutrients (nitrogen and phosphorus).

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Habitat and Fish Passage

The Boeing Creek basin has the largest contiguous forested area in the City, and water quality conditions are better in Boeing Creek than in any other monitored stream in the City. Additionally, Boeing Creek provides fish habitat (anadromous and resident fish, such as cutthroat trout, in the lower 0.5 mile, and only resident fish in the upper reaches), excellent riparian conditions, and forest canopy. Despite the excellent riparian corridor, aquatic habitat has been affected by stream channel bed and bank erosion, and multiple fish passage barriers (Attachment D) that have been in place for decades. There are at least eight fish passage barriers limiting the movement of anadromous fish entering Boeing Creek from Puget Sound. Approximately 2,300 feet of stream channel from the mouth of Boeing Creek to the Seattle Golf and Country Club water supply dam is open to anadromous fish. Upstream of the dam, there are numerous barriers. It would be a monumental effort to remove or reconfigure these barriers to facilitate passage for anadromous fish. However, incorporation of barrier removals into a long-term plan for improving Boeing Creek through peak flow and duration reductions (stormwater retrofit) and local habitat improvements would be a worthy goal. The cost for retrofit would need to be evaluated as to the overall benefit on the utility and therefore its ability to be funded through surface water utility rates.

Summary of Preliminary Conclusions:

The stormwater runoff in Boeing Creek will be reduced over time through (1) the redevelopment process which allows the current stormwater standards and regulations to start having a cumulative improvement on watershed conditions and (2) construction of low impact development retention/infiltration capital projects in the City right-of-way. The basin plan provides recommendations to improve watershed conditions by prioritizing capital projects and other programmatic actions that can meet multiple objectives such as reducing flows and improving water quality and restoring habitat (Attachment E); such projects include low-impact development type projects within City right-of-way. The stormwater condition assessment provides the information necessary to make critical repair and replacement investments in the city’s aging stormwater infrastructure. In addition, the basin plan will allow the City to propose stormwater retrofit projects that allow for leveraging of grant funds to improve watershed conditions at reduced costs to the City. A map of identified projects is shown in Attachment F.

STAKEHOLDER OUTREACH

The Open House for the Boeing and Storm Creek Basin Plan occurred on September 14, 2011 and was attended by 13 residents with interests in both drainage basins. Another open house specific to the Boeing Creek Basin Plan was held at Boeing Creek Park on August 28, 2012. This open house was attended by twelve residents and other interested parties outside of the basin. The City presented the scope of the project and solicited public input on surface water problems and concerns in each of the respective basins.

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COUNCIL GOAL(S) ADDRESSED The basin plan and its recommended projects support Council Goal # 2: Provide safe, efficient, and effective infrastructure to support our land use, transportation, and surface water plans.

RESOURCE/FINANCIAL IMPACT There is no resource or financial impact associated with this discussion at this time. The programmatic management actions identified in the Boeing Creek Basin Plan will be prioritized with other management actions identified within the other surface water basin plans in the city and may be proposed in the City’s CIP budget process. All operational and capital expenditures are funded through the Surface Water Utility Fund.

ATTACHMENTS

Attachment A - Boeing Creek 100-yr floodplain map Attachment B - Major Redevelopment Areas within Boeing Creek Basin Attachment C - Pipe Condition Assessment Map of Boeing Creek Basin Attachment D - Aquatic Habitat Features in Boeing Creek Basin Attachment E - Proposed Management Actions for Boeing Creek Basin Attachment F - Map of Proposed Management Actions for Boeing Creek Basin

000081 Legend

Channel Segment ID Subcatchment ID

100-yr Floodplain

Streams Pipes N 175th St. Subcatchment Boundaries

Ponds

Wetlands 3rd Ave. NW Ave. 3rd

MATCHLINE

(SEE BELOW)

Carlyle Hall Rd. NW

MATCHLINE

(SEE ABOVE)

Innis Arden Way

Beach Dr.

Attachment A: Preliminary 100-yr 150 0 150 Yards ± 150 0 150 Meters Boeing Creek Basin - Shoreline, WA Prepared by MLP, 10/18/2012; FIGURE1 000082 360 N 200th St.

350 355 420 Crista Ministries 8th Ave. NW

340 415

NW Richmond Beach Rd. 330

410 N 185th St.

400 Town Center Dayton Ave. Ave. N Dayton

320

315 305 325 235 N 175th St. 310 300 122

200

130 Carlyle Hall Rd. NW 205 120 230 Shoreline Community College 110 125 100 215 210 Beach Dr. 127 Aurora Ave. N

115 Aurora Square

225 Legend Dayton Ave. Ave. N Dayton

Streams

Redevelopment

220

Subcatchment Boundaries

InterUrban Ponds Trail N 145th St.

Wetlands

FigureAttachment 2: Redevelopment B: Redevelopment Scenario Scenario 400 0 400 Yards ± 400 0 400 Meters Boeing Creek Basin - Shoreline, WA DRAFT Prepared by MLP, 10/18/2012; FIGURE2 000083 NW 202ND ST NW 203RD PL N 203RD LN N 204TH PL N 204TH PL NW 203RD ST N 204TH ST

NW NW 203RD ST NW 203RD ST N 203RD ST VE VE NW 203RD ST N 203RD CT

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PL WO NW 201ST LN NW 201ST ST 1 3 23RD PL NW RE VENW NW 201ST STNW 201ST PL N 202ND ST

20T N 201ST8654 ST EN

BURKE BURKE

N NW 201ST ST RTH

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10TH NW 201ST ST 6574 A NW 201ST PL H N 201ST ST DENS

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H A

N W NW 3526 N 201ST ST NW 200TH ST N 201ST ST

N N

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** Attachment D: Wetlands and fish passage 4 barrier locations + % ! "#$%& &' ! (! ) **+,! -./0 (! ! &' "#$%& ! 000085 Attachment E: Table of Recommended Management Action

Table 1. Proposed Boeing Creek Basin Projects Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance (BC-Mon-1) water quality (BC-Ed-1) improve water could be pet waste quality na na na incorporated into control and monitoring City-led water high FC, TN, and other projects education Water quality program quality monitoring TP; low DO na na na na na na

na na na na na na

(BC-CIP-1) Hillslope and Boeing Reserve tightline existing bank erosion slope failures and stormwater and sedimentation discharges sedimentation field evidence downstream of directly to the na na na na in lower reach Seattle Golf and stream channel, of Boeing Country Club or provide Creek steel-pile dam energy dissipation

000086 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance (BC-Main-1) (BC-CIP-2) (BC-Mon-2) pipe maintenance open-cut pipe monitor pipes needed that replacement and not Approximately na na na was not modification of recommended 4,400 linear ft of accomplished drainage for immediate pipe in the basin during structures replacement needs repair or condition replacement; other assessment pipes require removal of utility (BC-Main-2) Conveyance crossings or pipe repairs to pipe modification of (BC-CIP-3) be handled by maintenance CCTV inspection improper drainage trenchless pipe na na na na City operations and structural connections. repair and deficiencies Significant cleaning, maintenance modified staff maintenance frequency, or (BC-CIP-4) monitoring are remove utility na na na na na recommended for crossings some pipe segments. na na na na na na

na na na na na na

000087 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance (BC-Hab-1) Develop feasibility (BC-Mon-3) study to determine the Partner with best course of Shoreline action for Community long-term College to maintenance (BC-Main-3) na continue na na and ivy removal conducting restoration of geomorphic Hidden Lake cross section multiple barriers, and Boeing monitoring in including Seattle Creek within Boeing Creek. Golf and Country Boeing Creek Club steel-pile dam, and riprap cascade, Shoreview Habitat and Innis Arden Way field evidence Parks. fish passage culvert, Hidden Lake dam, and (BC-Hab-2) degraded stream Develop an channel habitat; overall maintenance of restoration Hidden Lake plan for Boeing Creek that includes fish barrier na na na na removal, na in-stream habitat enhancement, and daylighting of piped sections of the stream.

000088 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance (BC-Hab-3) restore na na na na Boeing Creek in Hillwood Park flooding, catch service requests, (BC-CIP-6) basin surcharging in City the vicinity of North stormwater comprehensive th Flooding 175 Street upgrades na na na na na plan, and City between Linden between Linden staff Avenue North and Avenue and recommendations Dayton Dayton (BC-CIP-7) incorporation of There are several water quality recommended improvements, transportation such as rain City improvement gardens in transportation City projects, including conjunction with master plan transportation re-channelization, re- na na na na na opportunity master plan preservation, channelization of projects pedestrian safety, North 160th and intersection Street between improvements(City Greenwood of Shoreline 2011a) Avenue North and Aurora Avenue North

000089 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance (BC-CIP-8) utilize low- impact development techniques for new sidewalk na na na na na projects; incorporate stormwater retrofit into *Continued: projects City transportation (BC-CIP-9) master plan Incorporate opportunity stormwater projects improvements on major roadway preservation projects in the Boeing Creek basin; create an opportunity fund for transportation projects.

000090 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance

(BC-Mon-4) (BC-Ed-2) Monitor the (BC-Study-1) functionality of Develop materials and Conduct a deep (BC-Main-4) stormwater tools to study to injection wells educate evaluate the Develop (BC-CIP-10) at Shorewood owners of potential for maintenance City light Senior High large City-owned and strategies for interurban trail School as a properties in -operated na low-impact case study for the basin regional development bioinfiltration about facilities that techniques swales similar stormwater stormwater assess capital that are being General management retrofit facilities implemented stormwater opportunities. charges to in the City. There are many strategies in runoff issues, (Locations redeveloping stormwater retrofit other parts of including shown on properties. opportunities that the basin and channel bank field evidence map). will help reverse City. and bed and service previous impacts erosion, requests (BC-Study-2) and incrementally localized (BC-Ed-3) Develop an improve overall infrastructure flooding, and Facilitate a basin conditions. plan for conveyance focus group Shoreline Town issues with owners Center that of large incorporates (BC-CIP-11) properties in goals of the Westminster the basin to na adopted na na triangle bio- discuss Subarea Plan infiltration facility stormwater (City of retrofit Shoreline options for 2011b) and their sets forth redevelopme implementation nt projects. and financing options.

000091 Attachment E: Table of Recommended Management Action

Projects

How was it Issue Identified? Specifics Capital Monitoring Education Studies Habitat Maintenance

16733 Linden *Continued: Avenue North General Rain Garden stormwater runoff issues, including opportunities for Greenworks channel bank stormwater retrofit priority list and bed on City-owned (Leighton 2012) erosion, ROW localized flooding, and 14822 Linden conveyance Avenue North issues bioretention swale

City of Shoreline. 2011a. 2011 transportation master plan. Draft. City of Shoreline, WA. City of Shoreline. 2011b. Town center subarea plan. City of Shoreline, WA. Leighton A. 2012. City of Shoreline greenworks prioritization criteria matrix. Draft. SvR Design Company, Seattle, WA.

000092

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