Section 096-532-3 - Effluent qualityThe discharge to coastal waters must satisfy the minimum level of effluent quality specified by the following secondary treatment standards. The following paragraphs describe the minimum level of effluent quality attainable by secondary treatment in terms of the parameters biochemical oxygen demand with a 5-day incubation period (BOD 5), suspended solids (SS) and pH. All requirements for each parameter must be achieved.
A.BOD 5, SS, and pH(1) BOD 5 -- (a) The 30-day average may not exceed 30 mg/l.(b) The 7-day average may not exceed 45 mg/l.(c) The 30-day average percent removal may not be less than 85 percent.(d) At the option of the department, in lieu of the parameter BOD 5 and the levels of the effluent quality specified in subparagraphs 3(A)(1)(a), (b) and (c) of this chapter, the parameter CBOD 5(carbonacious BOD 5) may be substituted with the following levels of the CBOD 5 effluent quality. (i) The 30-day average may not exceed 25 mg/l.(ii) The 7-day average may not exceed 40 mg/l.(iii) The 30-day average percent removal may not be less than 85 percent.(2) SS -- (a) The 30-day average may not exceed 30 mg/l.(b) The 7-day average may not exceed 45 mg/l.(c) The 30-day average percent removal may not be less than 85 percent.(3) pH -- The effluent values for pH must be maintained within the limits of 6.0 to 9.0 unless the owner or operator demonstrates that inorganic chemicals are not added to the waste stream as part of the treatment process.B.Fecal coliform. The geometricmean of the samples from the discharge during any 30-day period does not exceed 20 fecal coliform/100 ml and not more than 10 percent of the samples exceed 40 fecal coliform/100 ml.C.Chlorine. Concentrations of total residual chlorine may not exceed 10.0 [MICRO]g/l (micrograms/liter).D.Test results. Prior to any such discharge occurring, the owner, operator or master, or other person in charge of a large commercial passenger vessel, can demonstrate test results from at least five samples taken from the vessel representative of the effluent to be discharged, on different days over a 30-day period, conducted in accordance with the guidelines in 40 CFR Part 136, which confirm that the water quality of the effluents proposed for discharge is in compliance with subsections (A), (B), and (C). The owner, operator, master or other person in charge of a large commercial passenger vessel shall demonstrate continued compliance through periodic sampling. Such sampling and test results are considered environmental compliance records that must be made available upon request of the department.06- 096 C.M.R. ch. 532, § 3