N.Y. Comp. Codes R. & Regs. tit. 6, § 232-3.6
(a) Operators of all alternative solvent dry cleaning equipment must record the following on checklists supplied by the department:
(b) Each owner or operator of a dry cleaning facility with any alternative solvent transfer machine(s) must maintain on-site, and provide upon request, a five year record and log showing the following information:
(3) the owner or operator must perform the following calculation and record the result on the first day of every month: