Section 11-62-26 - Wastewater effluent requirements, recycled water quality, monitoring, and reporting requirements applicable to treatment works treating domestic wastewater(a) All treatment works shall meet the applicable requirements of this section. Nothing in this section shall be construed to prevent the engineer from applying more stringent requirements if the engineer determines that the particular design and circumstances for which the engineer is responsible warrants the more stringent requirements.(b) Treatment works' effluent and other parameters shall be monitored as follows and shall not exceed the following limits:(1) Biochemical oxygen demand (BOD5). (A) For wastewater treatment works excluding wastewater pond systems with average daily flows greater than or equal to 100,000 gallons per day, the owner or operator shall perform composite sampling at least weekly.(B) For wastewater treatment works with average daily flows less than 100,000 gallons per day, the owner or operator shall perform grab sampling at least monthly.(C) For wastewater pond systems with average daily flows greater than or equal to 100,000 gallons per day, the owner or operator shall perform grab sampling at least weekly.(D) The BOD5 in the effluent from a treatment works shall not exceed 30 milligrams per liter based on the monthly average of the results of the analyses of composite samples.(E) The BOD5 in the effluent from a treatment works shall not exceed 60 milligrams per liter based on a grab sample.(2) Suspended solids.(A) For wastewater treatment works, except for wastewater pond systems, with average daily flows greater than or equal to 100,000 gallons per day, the owner or operator shall perform composite sampling at least weekly.(B) For wastewater treatment works with average daily flows less than 100,000 gallons per day, the owner or operator shall perform grab sampling at least monthly.(C) For wastewater pond systems with average daily flows greater than or equal to 100,000 gallons per day, the owner or operator shall perform grab sampling at least weekly.(D) The suspended solids in the effluent from a treatment works shall not exceed 3 0 milligrams per liter based on the monthly average of the results of the analyses of composite samples.(E) The suspended solids in the effluent from a treatment works shall not exceed 60 milligrams per liter based on a grab sample.(3) Owners or authorized agents shall submit suspended solids and BODs lab data to the director no later than thirty days after the last day of June and December, unless the data is already being submitted to the Department under an NPDES permit by a public agency.(4) The dissolved oxygen, pH, and 30 minutes settleability of the contents of the aeration tank shall be sampled and analyzed at least weekly.(5) Effluent chlorine residual, if any, shall be sampled and analyzed at least weekly.(6) Total daily flow shall be monitored at least weekly.(7) The volume of wastewater sludge wasted, the solids concentration of wastewater sludge wasted, the name of the wastewater sludge pumping and hauling firm, and the dates of pumping and hauling, if applicable, shall be recorded.(8) The operator shall maintain a log book or records which shall include but not be limited to: the date and time of operator entry, operating conditions, process control testing performed, and any servicing or preventative maintenance done while at the wastewater treatment works.(9) Alternative effluent limitations as permitted by EPA regulations, (40 CFR 125 and 40 CFR 133), relating to the definition of secondary treatment or other industrial categories, may be utilized by the director.(10) For the purposes of this section, the arithmetic average of the results of the analyses of composite samples shall be based upon one or more analyses made within a 30 consecutive calendar day period. The arithmetic average shall be the sum of the results of all analyses divided by the number of analyses made during the 30 consecutive calendar day period.(11) For the purposes of this section, composite samples shall consist of at least eight sample aliquots, collected at periodic intervals during the operating hours of the facility over a 24-hour period. The composite sample must be flow proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the stream flow at the time of sampling or the total stream flow since the collection of the previous aliquot. Aliquots may be collected manually or automatically.(c) In addition to subsection (b), treatment works producing R-1 water or R-2 water for recycled water systems shall provide continuous disinfection of the effluent as specified below unless otherwise specified by the director.(1) R-1 water disinfection requirements.(A) For chlorine disinfection process. The disinfection process shall provide a CT (the product of total chlorine residual and modal contact time measured at the same point) value of not less than 45 0 milligrams-minutes per liter at all times with a modal contact time of at least ninety minutes based on peak dry-weather design flow; or (B) For non-chlorine disinfection processes. The disinfection process shall demonstrate to the director's satisfaction the inactivation and removal of 99.999 per cent of the plaque forming units of F-specific bacteriophage MS2 or polio virus in the wastewater.(2) R-2 water disinfection requirements,(A) For chlorine disinfection processes.(i) A theoretical contact time of fifteen minutes or more and an actual modal time of ten minutes or more throughout which the chlorine residual is 0.5 milligrams per liter or greater; and(ii) Automatic continuous measuring and recording of chlorine residual shall be provided. The chlorine facilities shall have adequate capacity to maintain a residual of 2 milligrams per liter.(B) For non-chlorine disinfection processes. (i) The disinfection process shall demonstrate to the director's satisfaction the ability to meet the requirements of subsection (d) (2); and (ii) Automatic controls shall be provided to continuously measure and record disinfection dosage and residuals, if any.(3) Monitoring shall be by grab samples that shall be taken at a point following disinfection.(d) In addition to subsections (b) and (c), treatment works producing R-1 water or R-2 water for recycled water systems shall meet the following daily fecal coliform requirements unless other sampling frequencies are approved by the director. Monitoring shall be by grab samples that shall be taken at a point following disinfection. (1) R-1 water. (A) The median density measured in the disinfected effluent shall not exceed 2.2/100 milliliters using the bacteriological results of the last seven days for which analyses have been completed;(B) The density shall not exceed 23/100 milliliters in more than one sample in any thirty day period; and(C) The density in any one sample shall not exceed 200/100 milliliters.(2) R-2 water. (A) The median density as measured in the disinfected effluent shall not exceed 23/100 milliliters using the bacteriological results of the last seven days for which analyses have been completed; and(B) The density of shall not exceed 200/100 milliliters in more than one sample in any thirty day period.(e) In addition to subsections (b) through (d), treatment works producing R-1 water for recycled water systems shall provide continuous turbidity monitoring and recording prior to the filtration process and at a point after the filters and before application of the disinfectant. The R-1 water shall meet the following turbidity limits:(1) For filtration systems utilizing sand or granular media, cloth, or other synthetic media, the turbidity shall not exceed any of the following: (A) An average of two nephelometric turbidity units (NTU) within a twenty-four hour period;(B) 5 NTU more than five percent of the time within a twenty-four hour period; and(2) For filtration systems utilizing membrane filtration, the turbidity shall not exceed any of the following: (A) 0.2 NTU more than five percent of the time within a twenty-four hour period; and(f) When using media filtration for existing R-1 facilities the following performance criteria shall apply: (1) The design UV dose shall be at least 100 mJ/cm2 under maximum daily flow; and(2) The filtered UV transmittance shall be 55 percent or greater at 254 nanometers (nm).(g) When using membrane filtration for existing R-1 facilities J the following performance criteria shall apply: (1) The design UV dose shall be at least 80 mJ/cm2 under maximum daily flow; and(2) The filtered effluent UV transmittance shall be 65 percent or greater at 254 nm.(h) The minimum acceptable design requirements and commissioning of new UV disinfection systems shall comply with the Ultraviolet Disinfection Guidelines for Drinking Water and Water Reuse, Third Edition, 2003, published by the National Water Research Institute. (g) The analysis, including the handling and preservation of samples, to determine compliance with effluent requirements shall be performed in accordance with Standard Methods or EPA's Methods for Chemical Analysis of Water and Wastes. The director may approve alternative methods for analyzing the effluent limits of this section. The alternative test methods, when approved, may be used by the director to determine compliance with effluent limits as stated in this rule.[Eff 12/10/88, am 8/30/91; am and comp 12/09/2004] (Auth: HRS §§ 321-11, 342D-4, 342D-5) (Imp: HRS §§ 321-11, 322-1 to 322-4, 322-8, 342D-2, 342D-4, 342D-5, 342D-6, 342D-50)