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NOTE—8.5.1.3,8.5.1.4,and 8.5.1.5 are testing minimums.These minimums shall be attained to be considered <br /> a valid test. <br /> 8.5.2.1 EPA secondary treatment guideline parameters <br /> 8.5.2.1.1 CBOD5 <br /> The 30-d average of CBOD5 concentrations of effluent samples shall not exceed 25 mg/L. <br /> The 7-d average of CBOD5 concentrations of effluent samples shall not exceed 40 mg/L. <br /> 8.5.2.1.2 TSS <br /> The 30-d average of TSS concentrations of effluent samples shall not exceed 30 mg/L. <br /> The 7-d average of TSS concentrations of effluent samples shall not exceed 45 mg/L. <br /> 8.5.2.1.3 pH <br /> The pH of individual effluent samples shall be between 6.0 and 9.0. <br /> 8.5.2.2 Effluent concentration excursions <br /> System performance shall not be considered outside the limits established for Class I systems if, during the <br /> first calendar month of performance testing and evaluation, 7-d average and 30-d average effluent CBOD5 <br /> and TSS concentrations do not equal or exceed 1.4 times the effluent limits specified in 8.5.2.1. <br /> NOTE—The technology utilized in many residential wastewater treatment systems is biologically based. The <br /> allowance of excursions from the effluent limits established in this Standard during the first calendar month of <br /> performance testing and evaluation reflects the fact that an immature culture of microorganisms within the <br /> system may require additional time to achieve adequate treatment efficiency <br /> The value of 1.4 is based on the USEPA Technical Review Criteria for Group I Pollutants', including CBOD5 <br /> and TSS. <br /> 8.5.2.3 Color, odor, oily film, and foam <br /> 8.5.2.3.1 Color <br /> The color rating of each of the three diluted composite effluent samples shall be reported. There are no <br /> criteria that these values shall meet. <br /> 8.5.2.3.2 Odor <br /> The overall rating of each of the three diluted composite effluent samples shall be nonoffensive. <br /> 15/10/055/0030 This report may not be reproduced in whole or in part Page 28 of 59 <br /> Final Report without the expressed written consent of NSF International January 2019 <br />