Market Street - Francis to Lincoln Stormwater Retrofit
The Market Street - Francis to Lincoln Stormwater Retrofit project is set to begin construction phase. The project involves removing and replacing existing stormwater structures on Market Street between Francis Avenue and Lincoln Road in Spokane County, immediately north of the Spokane city limits. The existing system consists of catch basins and drywells. The project replaces the catch basins with Filterra Biofiltration Units and bioretention swales that capture and remove stormwater pollutants such as trash and debris, oils and grease, sediments, nutrients, metals, and bacteria.
In 1974, Congress passed the Safe Drinking Water Act (SDWA) which required the Environmental Protection Agency (EPA) to create the Underground Injection Control (UIC) Program to regulate underground disposal. The purpose of the program is to protect groundwater from contamination by regulating fluids that are placed in injection wells. The majority of Class V underground injection control (UIC) wells within Washington State are used for stormwater management. The drywells along this transportation corridor do not meet the current UIC regulations as outlined in the Stormwater Management Manual for Eastern Washington (SWMMEW).
Underground injection wells have the potential to place contaminants below the root zone so they may reach underground sources of drinking water. Stormwater collects a large variety of contaminants as it flows across roads, parking lots, roofs, and other impervious surfaces. In older developments with existing drywells, stormwater from pollutant-generating sources generally receives no treatment prior to being discharged into the ground to recharge aquifers.
The Market Street - Francis to Lincoln Stormwater Retrofit is estimated to cost around $900,000.00. Spokane County Stormwater Utility has received a Washington State Department of Ecology grant to fund the project.
Construction is expected to start May 11, 2017, with completion anticipated in August 2017.