EXH0669024923

Paramet fix. in c. co...,.., i. E.gi.e...g..,t p : 5808 Lake Washington Blvd. RE, Suite 200, Kirk|and, WA 98033-7350 425-822-8880 • Fax: 425-889-8808 ." ' , '1 MEMORANDUM " ) , Date: March 26, 2001 'I ' To: Linda Logan, John Brooker ,5 From: Jim Laughlin, Manager, Environmental Toxicology Laboratory i.! Subject: Update on WADOE's Position on Low Hardness Toxicity and Hardness _= Adjustment ..' cc: Scott Tobiason ,! _t This memorandum summarizes a phone conversation I had with Randall Marshall of the Washington _: State Department of Ecology (WADOE) regarding possible toxicity.due to low hardness and whether %: .. " to adjust the hardness of lab water to match the site water. •_::_,%,, Randy recalled a study conducted by Mike Stanawayof CH2MHill that may have addressed this ...... .. issue. I talked to Mike and it would appear they saw no acute toxicity with C. dubia down to about 10 i ._-":- -' mg/L as CaCO_. but did see chronic (reproductive) effects; -there were no real chronic effects with P. ' ._,, promelas, test..." " " :"-;.".:ii':":!:" ' " Regarding adjusting the hardness of the lab water to match the site water, Randy stated cleady that he is against such adjustments. The WER studies are designed to be tested against moderately hard ; synthetic lab water and the site waters tested as they arrive. For storm water samples the hardness is ; typically very low. However, the hardness of the storm water runoff should not be targeted but rather…

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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 [...]