CFR › Title 40 › Part 62 › §62.63140 CFR §62.631Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkThe plan applies to existing HMIWI for which construction was commenced on or before June 20, 1996, as described in 40 CFR part 60, subpart Ce.