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conducted to determine the extent to which these conditions adversely affected the performance of the <br /> system. Based on this assessment, specific data points may be excluded from the 7-d and 30-d averages of <br /> effluent measurements. Rationale for all data exclusions shall be documented in the final report. <br /> 8.5.1.2 In the event that a catastrophic site problem not described in this Standard including, but not limited <br /> to, influent characteristics, malfunctions of test apparatus, and acts of God, jeopardizes the validity of the <br /> performance testing and evaluation, manufacturers shall be given the choice to: <br /> 1) Perform maintenance on the system, reinitiate system start-up procedures, and restart the <br /> performance testing and evaluation; or <br /> 2)With no routine maintenance performed, have the system brought back to pre-existing conditions <br /> and resume testing within 3 wk after the site problem has been identified and corrected. Data <br /> collected during the system recovery period shall be excluded from 7-d and 30-d averages of effluent <br /> measurements. <br /> NOTE— Pre-existing conditions shall be defined as the point when the results of 3 consecutive data <br /> days are within 15% of the previous 30-d average(s) <br /> 8.5.1.3 A 7-d average discharge value shall consist of a minimum of 3 data days. If a calendar week contains <br /> less than 3 data days, sufficient data days may be transferred from the preceding calendar week to constitute <br /> a 7-d average discharge value. If there are not sufficient data days available in the preceding calendar week, <br /> the transfer of data days may take place from the following calendar week to constitute a 7-d average <br /> discharge value. No data day shall be included in more than one 7-d average discharge value. <br /> 8.5.1.4 A 30-d average discharge value shall consist of a minimum of 50% of the regularly scheduled <br /> sampling days per month. If a calendar month contains less than the required number of data days, sufficient <br /> data days may be transferred from the preceding calendar month to constitute a 30-d average discharge <br /> value. If there are not sufficient data days available in the preceding calendar month, the transfer of data <br /> days <br /> may take place from the following calendar month to constitute a 30-d average discharge value. No data day <br /> shall be included in more than one 30-d average discharge value. <br /> 8.5.1.5 During the stress loading sequence, consisting of wash-day, working-parent, power/equipment <br /> failure, <br /> and vacation stress loading periods, data shall be collected from a minimum of% of the total scheduled <br /> sampling days and from at least 2 of the scheduled sampling days during any single stress recovery. <br /> 8.5.2 Class I systems <br /> The following criteria shall be met in order for a system to be classified as a Class I residential wastewater <br /> treatment system. <br /> All requirements for each parameter shall be achieved except as provided for in 8.5.2.2. <br /> 15/10/055/0030 This report may not be reproduced in whole or in part Page 27 of 59 <br /> Final Report without the expressed written consent of NSF International January 2019 <br />