(1) The remaining amount of the funds appropriated for a uniform rate of reimbursement will be approved or denied using the same criteria as subdivision (a) of this section. The percentage rate of reimbursement for this second payment will be set at a rate which will fully expend the funds appropriated for a uniform rate of reimbursement. This rate will be the same for all applicants.

(2) The performance portion of each operation and maintenance aid grant will be approved in total or in part, or denied, based on a performance factor to be determined for each applicant. The performance factor will be calculated by comparing selected parameter concentrations, limits, or loadings allowed by the applicant's State Pollutant Discharge Elimination System (SPDES) permit with the actual annual average concentrations or loadings of the respective parameters in each sewage treatment plant's discharge. A mathematical formula will be established by the commissioner for determining the performance factor, which will be a proportion determined by dividing the permitted effluent limit for each selected parameter by the actual annual average concentration or loading for that parameter and then taking the arithmetic mean of those values. If the proportion thus determined exceeds 1.0, a value of 1.0 will be used as the performance factor. The performance payment will be made from funds appropriated for that purpose.