C95 for determining reasonable potential for parameters other than

temperature 19 (a) Existing discharges. If fewer than ten effluent data points are available, the C95 effluent concentration is determined by multiplying CE(mean) by 2.135 where CE(mean) is the arithmetic mean. If only a single effluent data point is available, it is CE(mean) for the purpose of determining C95. Where ten or more effluent data points are available, the C95 concentration is calculated directly from the effluent data set according to Equation I-8. (b) New discharges. For new discharges, C95 is estimated by multiplying the expected average effluent quality, CE(mean), by 2.135. Where new industrial facility discharges include cooling tower blowdown from a recirculating cooling water system, permit applicants must submit the results of at least three water samples collected from the cooling water source. The samples must be collected on different days no more than one year prior to submission of the application. The applicant must estimate the C95 concentration of the blowdown discharge using the source water monitoring data, based on the projected number of recirculation cycles.