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samples shall be collected for 6 consecutive days. Forty conducted to determine the extent to which these eight hours after the completion of the power/equipment conditions adversely affected the performance of the failure stress, influent and effluent 24-hour composite system. Based on this assessment, specific data points samples shall be collected for 5 consecutive days. may be excluded from the 7-day and 30-day averages of effluent measurements. Rationale for all data exclusions 9.4 Analytical descriptions shall be documented in the final report. 9.4.1 pH,TSS, and CBODS 9.5.1.2 In the event that a catastrophic site problem not described in this standard including, but not limited to, Y The pH, TSS, and CBODS of the collected influent and influent characteristics, malfunctions of test apparatus, effluent 24-hour composite samples shall be determined and acts of God, jeopardizes the validity of the with the appropriate methods in APHA's Standard performance testing and evaluation, manufacturers shall Methods for the Examination of Water and Wastewater. be given the choice to: 9.4.2 Color, odor, oily film, and foam 1) Perform maintenance on the system, reinitiate system start-up procedures, and restart the 9.4.2.1 General performance testing and evaluation; or The effluent composite samples shall be diluted 1:1000 2) With no routine maintenance performed, have the with distilled water. Three composite effluent samples system brought back to pre-existing conditions and shall be tested during the 6-month evaluation period. resume testing within 3 weeks after the site problem has been identified and corrected. Data collected 9.4.2.2 Color during the system recovery period shall be excluded from 7-day and 30-day averages of effluent The apparent color of the diluted effluent samples shall be measurements. determined with the visual comparison method described in APHA's Standard Methods for the Examination of NOTE — Pre-existing conditions shall be defined as the Water and Wastewater, eighteenth edition. point when the results of 3 consecutive data days are within 15%of the previous 30-day average(s). 9.4.2.3 Odor 9.5.1.3 A 7-day average discharge value shall consist of A panel consisting of at least 5 evaluators shall a minimum of 3 data days. If a calendar week contains qualitatively rate 200 mL aliquots of the diluted effluent less than 3 data days, sufficient data days may be transferred from the preceding calendar week to samples as offensive or non-offensive when compared to constitute a 7-day average discharge value. If there are odor-free water prepared in accordance with APHA's not sufficient data days available in the preceding Standard Methods for the Examination of Water and calendar week,the transfer of data days may take place Wastewater. from the following calendar week to constitute a 7-day 9.4.2.4 Oily film and foam average discharge value. No data day shall be included in more than one 7-day average discharge value. Diluted effluent sample aliquots shall be visually evaluated for the presence of an oily film or foaming. 9.5.1.4 A 30-day average discharge value shall consist of a minimum of 50%of the regularly scheduled sampling days per month. If a calendar month contains less than 9.5 Criteria the required number of data days, sufficient data days may be transferred from the preceding calendar month 9.5.1 General to constitute a 30-day average discharge value. If there are not sufficient data days available in the preceding 9.5.1.1 If conditions during the testing and evaluation calendar month,the transfer of data days may take place period result in system upset, improper sampling, from the following calendar month to constitute a 30-day improper dosing, or influent characteristics outside of the ranges specified in 9.2.1, an assessment shall be 01111120151060 This report may not be reproduced in whole or in part Page 28 of 46 Final Report without the expressed written consent of NSF International. April 2002 _