Stormwater Management

NPDES Permitting and Compliance   

We provide comprehensive services for Industrial Stormwater General Permits, Individual Permits, and Construction Stormwater Permits, including agency negotiations and coordination, obtaining, modifying, and renewing permits, Stormwater Pollution Prevention Plan (SWPPP) review and development, and compliance with permit limits. Our services also include evaluation and assistance with implementation of operational, source control and treatment Best Management Practices (BMPs) including preparing engineering design reports and All Known and Reasonable Technologies (AKART) studies. Floyd|Snider also provides expert litigation support to assist with third party lawsuits.

Mixing Zone Development   

We assist our clients in acquiring mixing zones to allow for adjusted permit limits under the National Pollutant Discharge Elimination System (NPDES) Individual Permits for appropriate facilities. This service includes simulating the mixing of stormwater discharges into the adjacent water body via modeling to determine an applicable mixing zone and associated permit-related negotiations with the regulatory agencies.

Stormwater Conveyance and Treatment Design   

We assist our clients and teaming partners in the design of stormwater conveyance systems and in the selection and design of stormwater treatment facilities. We select and implement stormwater treatment systems designed to be appropriate to each facility’s use and site conditions, meet the applicable water quality limits, and be economically viable for the client by evaluating up-front capital costs and on-going operation and maintenance costs.

Construction Management   

Floyd|Snider provides construction management services for stormwater-related improvements including installation of stormwater collection and conveyance systems, installation of stormwater treatment systems, construction of new outfalls, and abandonment of stormwater collection and conveyance systems.

Stormwater Source Control   

These services include evaluation and documentation of upland sources that do or may contribute to the contamination or recontamination of sediment sites via stormwater discharge to the sediments. This evaluation includes identification of potential on-site contributions and recommendations to eliminate or control those contributions most likely to cause sediment recontamination. In case of co-mingled discharges, as well as adjacent and/or upgradient contributions, this evaluation can include off-site evaluations of risks.

Low Impact Development   

We have provided assistance to the Washington State Department of Ecology (Ecology) with the inclusion of Low Impact Development (LID) standards into the Municipal Stormwater General Permits. Our services included facilitation and documentation services for Ecology's stakeholder process to develop recommendations from two advisory committees: a technical advisory committee and an implementation advisory committee. Throughout this process we worked closely with technical experts for LID implementation.