SR9/92 Intersection Improvements Design Build Project

Location: Snohomish County, WA
Owner: Washington State Department of Transportation

OCI was responsible for the Drainage Design and Temporary Sediment and Erosion Control (TESC) Design for the SR 9/92 Intersection Improvements Design Build Project in Snohomish County, WA. The main elements of the proposed development consist of widening SR 9 north of the intersection and widening SR 92 east of the intersection.  A new signal system was added at the intersection to accommodate the widening. Improvements to the existing drainage system and stormwater quality were also addressed by constructing a detention pond, using natural dispersion facilities and Filterra systems for enhanced treatment and oil control. Specifically, OCI was in charge of the TESC Plans, TESC Narrative, Conveyance and BMP sizing, Water Quality Monitoring Plan, Drainage Plans, Hydraulic Report, Drainage Existing Conditions Survey, Downstream Analysis, and Special Provisions.

Roadway and Transit Drainage

Service Details >>

Services List
  • Stormwater Management and Design
  • Stormwater Detention, Infiltration, and Treatment Design
  • Hydrologic and Hydraulic Modeling
  • Stormwater Pollution Prevention Plan (SWPPP) and Narrative
  • Temporary Erosion and Sediment Control (TESC) Plans
  • Green Streets and On-Site Stormwater Management Approaches
  • Bridge Scour Analysis
  • Highway Runoff Dilution and Loading Stormwater (HI-RUN) Model
  • Culvert Analysis and Design
Service Contact
Deepa Mungasavalli Prabhu, PE
Practice Lead

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