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EXH AR024706: Email Correspondence Metals/Tox Sampling Procedures Storm Water Study

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Sea-Tac Airport
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This August 1998 email exchange between Ken Ludwa and Doug Henderson of Parametrix, Inc. discusses technical procedures for collecting stormwater samples at the Port of Seattle for metals and toxicity testing. Ludwa asks about required sample volumes, filtration timing, bottle preparation, and transfer procedures when using an autosampler during a storm event. Henderson advises that bioassays require 1 gallon and metals testing requires 2 liters, and provides guidance on sample chilling, glassware cleaning, and handling precautions.

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Email exchange (AR024706–AR024707) dated August 11–13, 1998, between Ken Ludwa and Doug Henderson of Parametrix, Inc. (Kirkland, WA), regarding metals and toxicity (tox) bioassay sampling procedures for a Port Of Seattle stormwater investigation. Topics include required sample volumes (1 gallon/4 liters for bioassays; 2 liters for metals — 1 liter dissolved, 1 liter total recoverable), use of an autosampler for composite storm grab samples, dissolved metals filtration timing, sample chilling requirements, acid-washing and glassware cleaning procedures (soap, rinse, acid, rinse, acetone, rinse, deionized water rinse), and sample transfer protocols. Ken Ludwa asked about flow-weighted composites vs. equal-volume grabs. Document is part of PCHB Third Runway EIS administrative record.

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