Aug. 22, 2006 Brightwater treatment technology promotes improvements to Puget Sound salmon and orcas
Brightwater's advanced treatment technology will contribute to
improved water quality in Puget Sound, benefiting orcas and chinook
salmon according to a recent Endangered Species Act (ESA) review
by the National Marine Fisheries Service. Brightwater effluent will
be treated to such a high level it will greatly exceed all federal
requirements.
Fisheries, a division of the National Oceanic and Atmospheric Administration
(NOAA), was asked by the Army Corps of Engineers to review the Brightwater
project's biological assessment under Section 7 of the ESA after
federal officials listed southern resident orcas as endangered.
Chinook, a favorite food of orcas, is listed as threatened under
ESA.
"We are proud to be in the forefront of technology that will help
us save orcas and salmon as well as deliver multiple benefits to
the people of the region," said King County Executive Ron Sims.
"Integrating multiple benefits into an infrastructure project like
Brightwater is important to recovery of Puget Sound and the wildlife
that depend on it. "
The Corps had issued a federal permit to King County for the Brightwater
project in 2004 after an 18-month consultation. The permit covers
the entire project, including the treatment plant north of Woodinville,
a 13-mile conveyance pipeline, and an outfall in Puget Sound.
In a letter to
the Corps, (Adobe Acrobat
format) NOAA Fisheries supported King County's conclusion that construction
of an outfall in Puget Sound and operation of the Brightwater facilities
"may affect" the listed species, but would be unlikely to adversely
affect orcas.
The agency also acknowledged that the endangered marine mammal would
likely benefit from the use of the new treatment technology at Brightwater
King County plans to treat wastewater with membrane bioreactor (MBR)
technology, which will remove 75 percent more pollutants than conventional
wastewater treatment methods that already meet stringent requirements
for discharge into Puget Sound.
"Killer whales are likely to benefit from the proposed action because
the use of MBR treatment technology at Brightwater will result in
the discharge of treated effluent with contaminant levels substantially
below what they would be if the Brightwater facility were not permitted,"
said the concurrence letter from NOAA Fisheries.
NOAA Fisheries also noted that Brightwater's MBR technology will
more effectively remove mercury from wastewater, reducing its presence
in Chinook salmon
"[NOAA Fisheries] previously analyzed the effects of the outfall
operation on Puget Sound chinook and found that less mercury in
the wastewater system and better treatment will reduce the potential
for effects to Puget Sound chinook, which may also reduce the potential
for bioaccumulation of these contaminants in southern resident killer
whales."
"The MBR process at Brightwater will produce treated water so clean,
we'll actually be able to reuse it for non-drinking purposes like
irrigation and industry," said Executive Sims. "Reusing highly treated
water not only reduces discharges to Puget Sound, it also reduces
irrigation water withdrawals out of rivers, which helps salmon habitat."
Also in the letter, NOAA Fisheries stressed the importance of taking
steps to protect orcas during the construction of a mile-long outfall
in Puget Sound off Point Wells. Though orcas have not been commonly
sited in the area, during consultations with NOAA Fisheries, the
county agreed to take steps to mitigate potential construction impacts
to the animals. Measures include establishing buffer zones and work
windows, conducting acoustic monitoring, and using bubble curtains
and other sound attenuation methods.
Construction on the Brightwater treatment system is already under
way, with construction of the outfall scheduled for 2008.
During the Brightwater siting process, King County invested $10
million to conduct studies with the University of Washington on
Puget Sound oceanography, geology and marine biology, dramatically
increasing our knowledge of Puget Sound.
People enjoy clean water and a healthy environment because of
King County's wastewater treatment program. The county's Wastewater
Treatment Division protects public health and water quality by serving
17 cities, 17 local sewer utilities and more than 1.4 million residents
in King, Snohomish and Pierce counties. Formerly called Metro, the
regional clean-water agency now operated by King County has been
preventing water pollution for more than 40 years. |