EXH2069032547

Note: Processed steel fiber and crushed calcitic limestone are the only sand filter amendments for which Ecology has data that documents increased dissolved metals removal. Though Ecology is interested in obtaining additional data on the effectiveness of these amendments, local governments may exercise their judgment on the extent to which to allow their use. • Large Wetpond - See Chapter 10 • Media Filter targeted for phosphorus removal - See Chapter 12 Note: The use of a Stormfilter TM with iron-infused media is approved for use in limited circumstances, provided a monitoring program consistent with adopted protocols is implemented. • Two-Facility Treatment Trains - See Table 3.1 Table 3.1 - Treatment Trains for Phosphorus Removal First Basic Treatment FacIHty Second Treatment Facility Biofiltration Swale Basic Sand Filter or Sand Filter Vault Filter Strip Linear Sand Filter (no presettling needed) Linear Sand Filter Filter Strip Basic Wetpond Basic Sand Filter or Sand Filter Vault Wetvault Basic Sand Filter or Sand Filter Vault Stormwater Treatment Wetland Basic Sand Filter or Sand Filter Vault Basic Combined Detention and Wetpool Basic Sand Filter or Sand Filter Vault 3.4 Enhanced Treatment Menu Where Applied: Enhanced treatment is required for: Industrial project sites, Commercial project sites, Multi-family project sites, and Arterials and highways that discharge to fish-bearing streams, lakes, or to waters or conveyance systems tributaryto fish-bearing streams or lakes. Areas of multifamily, industrial and commercial project sites that are identified as subject to Basic Treatment requirements are not subject to Enhanced Treatment requirements. For developments…

Open full document

Upcoming Events

PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]