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average discharge value. No data day shall be included allowance of excursions from the effluent limits established in more than one 30-day average discharge value. in this standard during the first calendar month of performance testing and evaluation reflects the fact that an 9.5.1.5 During the stress loading sequence, consisting of immature culture of microorganisms within the system may wash-day, working-parent, power/equipment failure, and require additional time to achieve adequate treatment vacation stress loading periods, data shall be collected efficiency. from a minimum of 2/3 of the total scheduled sampling The value of 1.4 is based on the USEPA Technical Review days and from at least 2 of the scheduled sampling days Criteria for Group I Pollutants, including CBODS and TSS. during any single stress loading period. 9.5.2.3 Color, odor, oily film, and foam 9.5.2 Class 1 systems 9.5.2.3.1 Color The following criteria shall be met in order for a system to be classified as a Class].residential wastewater treatment The color rating of each of the 3 diluted composite system. All requirements for each parameter shall be effluent samples shall not exceed 15 units. achieved except as provided for in Section 9.5.2.2. 9.5.2.1 EPA secondary treatment guideline 9.5.2.3.2 Odor parameters The overall rating of each of the three diluted composite 9.5.2.1.1 CBODS effluent samples shall be non-offensive. The 30-day average of CBODS concentrations of effluent 9.5.2.3.3 Oily film and foam samples shall not exceed 25 mg/L. Oily films and foaming shall not be visually detected in The 7-day average of CBODS concentrations of effluent any of the diluted composite effluent samples. samples shall not exceed 40 mg/L. 9.5.3 Class Il systems 9.5.2.1.2 TSS The following criteria shall be met in order for a system The 30-day average of TSS concentrations of effluent to be classified as a Class II residential wastewater samples shall not exceed 30 mg/L. treatment system. The 7-day average of TSS concentrations of effluent samples shall not exceed 45 mg/L. 9,5.3.1 CBODS 9.5.2.1.3 PH Not more than 10% of the effluent CBOD5 values shall exceed 60 mg/L. The pH of individual effluent samples shall be between 6.0 and 9.0. 9.5.3.2 TSS 9.5.2.2 Effluent concentration excursions Not more than 10% of the effluent TSS values shall exceed 100 mg/L. System performance shall not be considered outside the limits established for Class I systems if, during the first calendar month of performance testing and evaluation, 7- day average and 30-day average effluent CBODS and TSS concentrations do not equal or exceed 1.4 times the effluent limits specified in 9.5.2.1. NOTES — The technology utilized in many residential wastewater treatment systems is biologically-based. The 01/11/2015/060 This report may not be reproduced in whole or in part Page 29 of 46 Final Report without the expressed written consent of NSF International. April 2002