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(4) You must make all opacity observations using Method 9 in appendix A-4 to 40 CFR part 60 and following the procedures described in paragraphs (c)(4)(i) and (Read more
Feb 23, 2026 CFR Promulgated Test Method 9 Visual determination of the opacity of emissions from stationary sources.
May 2, 2004 Costs for remediating sites with groundwater contamination can range from $100,000 to over $1 million depending on the extent of contamination.Read more