where:
%VLO = Overall performance of total valves in the applicable process unit or group of process units
%VLi = Percent leaking valves in subgroup i, most recent value calculated according to the procedures in paragraphs (c)(1)(ii) and (c)(2) of this section.
Vi = Number of valves in subgroup i.
n = Number of subgroups.
where:
%VL = Percent leaking valves.
VL = Number of valves found leaking, excluding nonrepairable valves, as provided in paragraph (c)(3) of this section, and including those valves found leaking pursuant to paragraphs (d)(2)(iii)(A) and (d)(2)(iii)(B) of this section.
VT = The sum of the total number of valves monitored.
40 C.F.R. §63.1025