Stormwater Facilities

DEEP EXPERIENCE IN DESIGN AND MAINTENANCE

United under one company, MacKay Sposito and Riparia Environmental bring clients complete stormwater services — spanning planning, design, maintenance, and compliance.

Together we provide comprehensive stormwater design and maintenance services to keep your facilities in compliance year-round. Our goal is to establish effective stormwater systems, and vegetation management, along with routine inspections and ongoing maintenance to ensure your infrastructure functions properly while meeting regulatory standards.

Wet Pond

A basin that has two or more pool cells and is typically filled with water year-round. Designed to reduce flows, remove sediment, and reduce phosphorous.

Photo Credit: Stormwater Partners

Detention Basin

Tried and true method of controlling stormwater flow from heavy rainfall.

Photo Credit: Stormwater Partners

Swale

A common surface facility with a wide, flat-bottomed channel, filled with grass or other plants, slows flow, and reduces pollutants.

Photo Credit: Stormwater Partners

Cartridge Filter

An underground system of filter media that effectively removes pollutants from stormwater.

Photo Credit: Stormwater Partners

Inspections

Initial system assessments, routine yearly status checks, post major storm event monitoring

Vegetation Management

Leaf, blackberry, and other invasive plant removals, tree care and removal, mowing, specialty wetland and raingarden plant care and replacements

Sediment Removal

Catchbasin cleaning, treatment manholes, filter vaults, detention ponds and pipes

Hardware Repair

Cartridge replacements, ladder replacements, grates, flow control structures, pipe inspections, fence repair

Engineering

Civil design, facility redesigns, construction management, surveying, landscape architecture, and permitting

Pest Control

Moles, voles, gophers, insects

Source Control

Street sweeping, use-assessments, erosion control, problem root cause analysis

Refurbishment

Restoring functions for bio-swales, wetponds, detention basins, raingardens, infiltration basins, reforming side walls and berms, impacted soil replacements

Regulatory

Letter writing, surveying, engineering design, facility redesigns, permitting

First phase of Columbia River waterfront development
Deep stormwater, sanitary sewer, and water lines for future extension
Transportation Improvement Board funding required quick completion
Installed during time of low groundwater levels due to proximity to the Columbia River

Stripped and graded existing track to drain to a nearby catch basin
Constructed underdrain to supplement catch basins
Designed roof drain and french draining systems
Designed a retaining wall
New athletic field drainage system
Added riprap ditch to the north side of the

Inclusive play elements including nature play areas
ADA access throughout the park.
Naturalized and sustainable water quality and detention facilities.

Project Highlights:

137,000 sf, three-story building
Existing Clinic building remained open during construction
Phase 1 –new building and south and west parking lots
Phase 2 – east parking lot and demolition of old building