Section 096-570-1 - Criteria for acceptable CSOsA discharge from a combined overflow point within a sewerage system is permitted only when the discharge meets the following conditions.
A.Discharge in excess of design capacity. The discharge consists of wastewater in excess of design capacity of a municipal or quasi-municipal sewerage system, including pumps or treatment facilities, that conveys both sanitary wastes and stormwater in a single pipe system and that is in direct response to a storm event or snow melt;B. Discharge not due to mechanical failure. The discharge is not the result of mechanical failure, improper design or inadequate operation or maintenance, and;C.CSO Master Plan. The licensee is actively developing or implementing a CSO Master Plan in accordance with this chapter, and as approved by the department; or the licensee has implemented the CSO Master Plan and a discharge occurs that is caused by conditions exceeding those upon which the Plan is based.06- 096 C.M.R. ch. 570, § 1