Civil Engineering

At Red Barn, we are design-focused and have our system set up that controls both the survey collection and the geotechnical requirements to provide full-service civil engineering design services to support any type of building, residence, roadway, plat, or utility project where the earth is being moved. Our services include the following general areas:

  • Erosion & Sediment Control
  • Stormwater Design & Drainage Reports
  • Foundation Drainage Design
  • Water Services
  • Sanitary Sewer
  • Dry Utility Coordination
  • Pavement Design (Asphalt & Concrete Jointing Plans)
  • Grading Plan (coordination with Architect and Landscape Architect)

Seattle-Area Projects

South Puget Sound

Erosion & Sediment Control

  • Erosion and Sediment Control (ESC)/Construction and Sediment Control (CSC)
  • King County Industrial Waste (KCIW) Permit
  • Ecology’s Construction General Permit
  • Construction Stormwater Pollution Prevention Plan (SWPPP)
  • Dewatering Permits
  • Discharge to Sanitary Sewer Permits
  • Certified Erosion and Sediment Control Lead (CESCL)
  • pH and Turbidity Monitoring
  • Turf Reinforced Matting
  • Post Construction Soil Amendments
Turf Reinforced Matting

Zero-Lot Line

Erosion and Sediment Control

High Groundwater

Stormwater Design

  • Provide jurisdiction specific green stormwater infrastructure (GSI)/low impact development (LID)
  • Rain gardens
  • Non-infiltrating bioretention
  • Infiltrating bioretention (w/ Red Barn’s Geotech Group)
  • Infiltration trenches or drywells
  • Dispersion
  • Pervious pavement surface and facility
  • Water quality treatment
  • Bioswales & biofiltration
  • Combined Sewer Overflow (CSO) reduction planning and design
  • Industrial stormwater design (removal of dissolved zinc/copper per NPDES compliance standards)
  • Outfall design and permitting
  • Box culvert design
Plan Diagram


Drainage Piping with Ladder

Storm Structures

Measuring Drainage Hole


Engineers Placing Cement Drainage Section

Box Culvert

Drainage Ditch with Piping


Cement Block with Piping


Foundation Drainage Design

  • Shoring wall drainage
  • Pump performance specifications
  • Coordination with geotechnical engineer/environmental engineer for discharge location of footing drains
  • Footing drain design including bentonite panel/Mira drain and coordination with the geotechnical engineer and envelope consultant for the capillary break

Water – Domestic and Fire Services

  • Water main extensions
  • Domestic meter and service line
  • Fire services (hydrants, Post Indicator Valve (PIV), Fire Department Connections (FDC))
  • Irrigation meter and service line
  • Water system analysis (City-wide modeling for fire flow analysis and system capacity)
  • On-call with MEP firm to obtain meters sizing

Sanitary Sewer

  • Sanitary sewer main extensions
  • Force main design
  • Trenchless/horizontal drilling
  • Grinder pump design
  • On-call with MEP firm to provide sanitary sewer sizes
  • Partner with sewer CCTV specialists to review side sewers

Dry Utility Coordination

  • Comcast
  • CenturyLink
  • Frontier

Pavement Design

Red Barn uses coordination with geotechnical firms to review design sections for:

  • Pervious concrete pavement
  • Pervious asphalt
  • Pavers
  • Asphalt
  • Cement Concrete
  • Gravel


Grading is the coordination between architect and civil designer. The following are completed as part of the Red Barn grading plans:

  • ADA design & review
  • Door elevations
  • Walkway grades
  • Window well grades/drainage
  • Flat area hardscape drainage (trench drains & runnels)
  • Mass grading
  • Earthwork quantity takeoffs
  • Road and driveway grading using Civil 3D
Grading Design

ADA Ramps

Grading Project

Site Excavation/Shoring

Mass grading

Site Mass Grading

Grading Diagram

Street Grading

Gravel Road

Gravel Road

Digital Grading Plan

Earthwork Calc.

Contact us for more information on our civil engineering projects. We serve clients in Seattle, Washington, and throughout the state.