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3 <br /> 9.5.2.1 EPA secondary treatment guideline The overall rating of each of the three diluted composite <br /> parameters effluent samples shall be non-offensive. <br /> 9.5.2.1.1 CBOD5 9.5.2.3.3 Oily film and foam <br /> The 30-day average of CBOD5 concentrations of effluent Oily films and foaming shall not be visually detected in <br /> samples shall not exceed 25 mg/L. any of the diluted composite effluent samples. <br /> The 7-day average of CBOD5 concentrations of effluent 9.5.3 Class II systems <br /> samples shall not exceed 40 mg/L. <br /> The following criteria shall be met in order for a system <br /> 9.5.2.1.2 TSS to be classified as a Class If residential wastewater <br /> treatment systema <br /> The 30-day average of TSS concentrations of effluent <br /> samples shall not exceed 30 mg/I_. 9.5.3.1 C0005 <br /> The 7-day average of TSS concentrations of effluent <br /> samples shall not exceed 45 mg/L. Not more than 10% of the effluent CBOD5 values shall <br /> 9.5.2.1.3 pH exceed 60 mg/L. <br /> 9.5.3.2 TSS <br /> The pH of individual effluent samples shall be between <br /> 6.0 and 9.0. Not more than 10% of the effluent TSS values shall <br /> exceed 100 mg/L. <br /> 9.5.2.2 Effluent concentration excursions <br /> System performance shall not be considered outside t#e <br /> limits established for Class I systems jr,'iluring the first` " <br /> calendar month of performance testing and evaluation,7- <br /> day average and 30-day average effluent CBODr, and <br /> TSS concentrations do not equal or exceed 1.4 times the <br /> effluent limits specified in 9.5.2.1. <br /> NOTES — The technology utilized in many residential <br /> wastewater treatment systems is biologically-based. The <br /> allowance of excursions from the effluent limits established <br /> in this standard during the first calendar month of <br /> pert+ommnce testing and evaluation reflects the fact that an <br /> Immature culture of microorganisms within the system may <br /> require additional time to achieve adequate treatment <br /> efficiency. <br /> The value of 1.4 is based on the USEPA Technical Review <br /> Criteria for Group I Pollutants,including CBODs and TSS. <br /> 9.5.2.3 Color,odor,oily film,and foam <br /> 9.5.2.3.1 Color <br /> s <br /> The color rating of each of the 3 diluted composite <br /> effluent samples shall not exceed 15 units. <br /> 9.5.2.3.2 Odor <br /> 15Ja60This.report may-not be(produced in whole or in part Page 31 of 49 <br /> Final Report without the expressed written consent of NSF Intemational. April 2000 <br />