EXH0650024706

i"KenLudwa- Re: auest_onsre_rdin me_ts/tox sar_p_ng ........ ,........... Page 1 From: Doug Henderson To: Ken Ludwa Date: Thu, Aug 13, 1998 5:33 PM Subject: Re: questions regardingmetals/toxsampling Ken, For the bioassays,we willneed 1 gallon(4 liters). For the metals,we will need 2 liters, 1for dissolvedand for totalrecoverable. ideally,thesampleswould be filteredon site. However,I don't thinkthat that is necessary forthis investigation.Also, when sampling for permit purposes,the samplerneeds tobe chilled while it is sampling. Again, I do not think this will be necessaryfor what we aredoing. Acid-washing is fine for the metals, but for bioassays,there is a specific procedure for cleaning glassware ((.,e.,soap, rinse, acid, rinse, acetone, rinse, d.i. rinse). If there isthe potential for previous contamination in the sample bottle (in the autosampler), we mightwant to clean it here at the lab. If, on the other hand, it has only used for these samples, then an acid-rinsewill probablywork for our purposes. As to you fourth question, I don't know of any specialprocedures other than 1) wear non-talc gloves 2) don't spill it 3) don't breath on it 4) don't contaminate it! If it's difficult to pour into the sample bottles, feel free to bring it backto the lab. Please remember to chill - the sample as soon as you can. hopethisanswers your questions. Let me knowif you need anything else. Doug Douglas Henderson dhenderson@parametrix.com Parametrix, Inc. 5808 LakeWashington Btvd NE Suite 200 Kirkland,WA 98033 (425) 822-8880 (voice) (425) 889-8808 (facsimile) >>> Ken Ludwa 081118:28 AM >>> For the Port of Seattle tox/metals sampling, I…

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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 [...]