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EXH AR026486: Memo – Site-Specific Copper Translator Development

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This December 1998 internal memorandum from Justin Kophs to Linda Logan outlines options for developing a site-specific copper translator for the Port of Seattle, summarizing EPA guidance on dissolved and total recoverable metal sampling studies. It describes recommended approaches including field partitioning studies, historical data equations, and laboratory mixing tests to measure how copper partitions between dissolved and total recoverable forms in receiving water. The memo notes that while a site-specific translator improves compliance measurement accuracy, it cannot be used to influence permit limits in the same way as a Water Effect Ratio (WER).

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Notes

Memorandum dated December 8, 1998 from Justin Kophs to Linda Logan (cc: Doug Henderson) summarizing options for developing a site-specific copper metals translator for the Port Of Seattle. Discusses WDOE recommendations for dissolved/total recoverable metal partitioning studies incorporating seasonal variation, referencing WAC 173-201A, Prothro (1993), and EPA Metals Translator guidance document (EPA 823-B-96-007). Covers three approaches: field partitioning study (minimum 4–10 pairs of dissolved/total recoverable samples at low flow), equation-based estimation using historical TSS and Kd values from Technical Guidance Manual for Performing WLAs (EPA-440/4-84-020), and laboratory WER-style mixing study using effluent and ambient upstream receiving water. Notes that site-specific translator applies to receiving water data and cannot influence permit limits like a WER. AR 026486–026487.

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