I found this typo this morning that I failed to change.
D should be F.
/ O/ 2
You probably caught it by now.
Page 56, Section 611.356(d)(4)((strikethrough: D))(F)(ii), 7th line, should
read “for lead and copper the frequency specified in” in place of “for morethan nine days in any six-month period specified in Section 611 .357(d) inaccordance with”...