Chronic For chronic toxicity: 24-hr the results do or do not discharges. It may also be modified toxicity composite, show toxicity at dilutions so that WET testing coincides with specify location, taken after corresponding to the edge monitoring for parameters that may such as: dechlorination and before the of the [modify as needed: be contributing to toxicity. effluent flume. ZID and the mixing zone]. Location When possible, conduct WET testing The corresponding should be the same as concurrent with testing for dilutions are as follows: insert list monitoring for parameters ZID: XX of parameters such as chlorine, that may contribute to Mixing zone: XX ammonia, metals, etc. that may toxicity. contribute to toxicity and for which A template for providing testing is already required. WET test results is If a particular test shows toxicity at provided below. the acute include if there is a ZID: (ZID) or the chronic (RMZ) dilutions, the permittee must re-test and if necessary evaluate the cause of toxicity as described in , condition 12?. The permittee must submit the results of WET tests using the template below, along with laboratory reports. Table B5: Template for Reporting WET Test Results Date of Test Organism Type of Test % Effluent at Result % Effluent at or edge of ZID or Endpoint chronic) RMZ (NOEC, LOEC or IC25) 1/1/2015 Water Flea Acute 40% at ZID Pass NOEC = 50% 1/1/2015 Fathead Minnow Chronic 20% at RMZ Pass IC25 = 40% 1/1/2015 Algae Chronic 20% at RMZ Pass LOEC = 25% Etc. Recycled Water Monitoring Requirements The permittee must monitor recycled water for outfall (insert outfall no.) as listed below. The samples must be representative of the recycled water delivered for beneficial reuse at a location identified in the Recycled Water Use Plan. Table B6: Recycled Water Monitoring Minimum Sample Item or Parameter Time Period Report Frequency Type/Required Action Total Flow (MGD) or Daily Measurement Quantity Irrigated (inches/acre)
discharges. It may also be modified so that WET testing coincides with monitoring for parameters that may be contributing to toxicity. When possible, conduct WET testing concurrent with testing for insert list of parameters such as chlorine, ammonia, metals, etc. that may contribute to toxicity and for which testing is already required. If a particular test shows toxicity at include if there is a ZID: the acute (ZID) or the chronic (RMZ) dilutions, the permittee must re-test and if necessary evaluate the cause of toxicity as described in , condition 12?. the results do or do not show toxicity at dilutions corresponding to the edge of the [modify as needed: ZID and the mixing zone]. The corresponding dilutions are as follows: ZID: XX Mixing zone: XX A template for providing WET test results is provided below. Chronic toxicity For chronic toxicity: 24-hr composite, specify location, such as: taken after dechlorination and before the effluent flume. Location should be the same as monitoring for parameters that may contribute to toxicity. The permittee must submit the results of WET tests using the template below, along with laboratory reports. Table B5: Template for Reporting WET Test Results Date of Test Organism Type of Test or chronic) % Effluent at edge of ZID or RMZ Result % Effluent at Endpoint (NOEC, LOEC or IC25) 1/1/2015 Water Flea Acute 40% at ZID Pass NOEC = 50% 1/1/2015 Fathead Minnow Chronic 20% at RMZ Pass IC25 = 40% 1/1/2015 Algae Chronic 20% at RMZ Pass LOEC = 25% Etc. Recycled Water Monitoring Requirements The permittee must monitor recycled water for outfall (insert outfall no.) as listed below. The samples must be representative of the recycled water delivered for beneficial reuse at a location identified in the Recycled Water Use Plan. Table B6: Recycled Water Monitoring Item or Parameter Time Period Minimum Frequency Sample Type/Required Action Report Total Flow (MGD) or Quantity Irrigated (inches/acre) Daily Measurement
NPDES-PERTMinor.docx