A June 1998 internal email from Ken Ludwa to Jim Kelley includes spreadsheet data comparing removal efficiency percentages for various pollutants—including solids, phosphorus, nitrogen, BOD, iron, lead, zinc, copper, bacteria, and total petroleum hydrocarbons—across multiple published studies from the 1980s and 1990s. The tables compile findings from sources such as Marselek et al. (1996), Metro (1992), and the UW Short Course, and conclude with recommended removal efficiency values for each pollutant category. This document appears to relate to Best Management Practices (BMPs) for stormwater treatment, likely in the context of environmental review for airport-related runoff management.Open full document
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Email dated June 30, 1998 from Ken Ludwa to Jim Kelley, AR 024744-024746, attaching spreadsheet data (Bmps.xls) on Best Management Practices (BMP) stormwater removal efficiency percentages. Tables compile removal efficiency values for solids, phosphorus (P), nitrogen (N), BOD, general pollutants, iron (Fe), lead (Pb), zinc (Zn), copper (Cu), bacteria, and TPH from multiple sources including Marsalek et al (1996), Metro (1992), Wang et al (1981), Oakland (1963), Kercher et al (1983), Harper (1984), Minton (1993), UW Short Course, and MWCOG (1979). Recommended values listed for each parameter. Filed in PCHB Third Runway EIS administrative record.