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Stormwater Management Regulation Update. UDC Update Project Utilities Stakeholder Group November 13, 2007. Snohomish County Planning & Development Services. UDC. CODE PROVISIONS. Processes & Procedures. Land Use & Zoning. Development Standards. Life, Health & Safety. POLICY FOUNDATION.

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Stormwater Management Regulation Update

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Stormwater management regulation update

Stormwater Management Regulation Update

UDC Update Project

Utilities Stakeholder Group

November 13, 2007

Snohomish CountyPlanning & Development Services


Udc life health safety pillar

UDC

CODE PROVISIONS

Processes & Procedures

Land Use & Zoning

Development Standards

Life, Health & Safety

POLICY FOUNDATION

LEGAL FOUNDATION

UDC Life, Health & Safety Pillar


Why are we doing this update

Why Are We Doing This Update?

  • Protect health and safety

  • Prevent/minimize degradation of water quality and slope instability

  • Preserve WQ for aquatic habitats, recreation, and drinking water

  • Comply with CWA and DOE NPDES Permit


Phase 1 municipal stormwater permit requirements

Phase 1 Municipal Stormwater Permit Requirements

  • Adopt Appendix 1 Minimum Technical Requirements for New Development and Redevelopment

  • Adopt 2005 DOE Stormwater Manual for Western Washington with a Snohomish County Addendum


Project managers

Project Managers


How is stormwater managed

How is Stormwater Managed?

  • Construction Stormwater Pollution Prevention Plan (SWPPP)

  • Control water flow, install sediment controls, stabilize soils, protect slopes, wetlands, drain inlets, channels and outlets

  • Control pollutants with Best Management Practices (BMPs), source control, runoff treatment, and treatment facility sizing


What s new

What’s New?

  • More restrictive exemptions

  • Applies to development and redevelopment

  • Applies to Class IV FP conversions - stormwater calculations required

  • More analysis is required for discharges to wetlands and a different baseline is used for the analysis in the 2005 DOE Manual


What s new continued

What’s New? (continued)

  • Larger detention and retention ponds

  • Pre LDA site inspection

  • Reporting and inspections: existing facilities and upgrades

  • New pollution source control rules

  • Permit has several less restrictive provisions than existing code


Code revisions

Code Revisions

  • Revisions to drainage & grading codes

    - Exemptions

    - Development & redevelopment thresholds

    - Minimum requirements


Doe 2005 manual

DOE 2005 Manual

  • Adopt 2005 DOE Manual with addendum and ref to drainage and grading

  • Change to reflect Snohomish County business practices

  • Modify for clarity

  • Change to make “user friendly”


Engineering design development standards edds

Engineering Design & Development Standards (EDDS)

  • Revisions to address LID design standards

  • Review other standards (roads, drainage, etc.) for appropriate revisions

  • Modify for consistency with code and Drainage Manual

  • Adopted per rulemaking process


Permit utility exemption

Permit Utility Exemption

(f)Underground utility projects located outside of a critical area that replace ground surfaces with in-kind materials or materials with similar runoff characteristics are exempt from all minimum requirements in SCC 30.63A.XXX except for minimum requirement #2 Construction Stormwater Pollution Prevention Plan pursuant to SCC 30.63A.XXX.


Existing utility exemptions

Existing Utility Exemptions

(3)  Utility construction and maintenance.     (a)  Minor utility activities in improved county rights-of-way which, pursuant to Title 13 SCC, do not require a Type D permit are exempt from the requirements of this chapter; (Note items b-e below not clearly exempt in permit)     (b)  Utility construction outside critical areas and within county rights-of-way conducted under a Type D7 blanket utility permit pursuant to Title 13 SCC which does not adversely impact critical areas ((, lakes)), or upstream or downstream properties shall comply with the erosion control requirements of SCC 30.63A.220(1), and is exempt from all other requirements of this chapter.  Utilities applying for a blanket utility construction permit shall propose erosion and sedimentation control best management practices for all permitted activities at the time of project application. 


Existing utility exemptions1

Existing Utility Exemptions

(d)  Utility construction within impervious surface areas, including trenching or other utility installation or maintenance which cuts and subsequently repairs existing impervious surface outside critical areas and outside of public rights-of-way, which does not adversely impact critical areas and their buffers ((, lakes, )) Keep and their buffers -old CAR or upstream or downstream properties, shall comply with the erosion control requirements of SCC 30.63A.220(1), and is exempt from all other requirements of this chapter.  Utilities proposing installation or maintenance which is subject to a county permit, approval or authorization shall propose erosion and sedimentation control best management practices for the utility construction at the time of application.


Existing utility exemptions2

Existing Utility Exemptions

(e)  Utility maintenance outside critical areas and outside of public rights-of-way which does not add impervious surface and does not adversely impact critical areas, lakes, or upstream or downstream properties shall comply with the erosion control requirements of SCC 30.63A.220(1), and is exempt from all other requirements of this chapter.


Existing utility exemptions3

Existing Utility Exemptions

(c)  Major utility construction within impervious surface areas, including trenching or other utility installation or maintenance which cuts and subsequently repairs existing impervious surface outside critical areas & within public rights-of-way conducted under a Type D8 major utility construction permit pursuant to Title 13 SCC, which does not adversely impact critical areas ((,lakes,)) or upstream or downstream properties, shall comply with the erosion control requirements of SCC 30.63A.220(1), & is exempt from all other requirements of this chapter. Utilities applying for a major utility construction permit shall propose erosion and sedimentation control best management practices for the utility construction at the time of application.


County strategy

County Strategy

  • Discuss existing exemptions with DOE

  • Update requirements for exemptions:

    - CESCL to manage project

    - Blanket SWPPPs

    - other ideas?


General project schedule

General Project Schedule

  • SEP: Draft codes and DOE Manual

  • OCT – DEC: Draft documents and public outreach

  • DEC: Review drafts

  • FEB: Transmit codes and manual to DOE for 60-day review

  • APR – JUL 2008: PC and Council Public Hearings

  • AUG/SEP 2008: Adoption for NPDES permit compliance


Keep in touch

Keep in Touch

  • Status updates and drafts available on the UDC Update Project homepage at www.snoco.org(search UDC Update)

  • Public can submit comments on the project page


Staff contacts

Staff Contacts

  • Bill Leif, Environmental Program Compliance Specialist, 425-388-3148

  • Randy Sleight, Chief Engineering Officer, 425-388-3311, x2014

  • Arthur Lee, Project Specialist, 425-388-3812

  • Bob McEwen, Transportation Specialist, 425-388-3488, x4578

  • Linda Kuller, Chief Planning Officer, 425-388-3412


Acronyms

Acronyms

  • BMP – Best Management Practices

  • CESCL – Certified Erosion-Soil Control Lead

  • CWA – Clean Water Act

  • DOE – Department of Ecology

  • DOE Manual – 2005 Stormwater Manual for Western WA

  • EDDS – Engineering Design & Development Standards

  • LID – Low Impact Development

  • NPDES – National Pollutant Discharge Elimination Permit

  • SWPPP – Stormwater Pollution Prevention Plan

  • WWHM: Western WA Hydrology Model


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