|2026/2027 Update | A+ Graded
What is an ATS - Answer -Any treatment that employs chemical coagulation, chemical
flocculation, or electrocoagulation in order to reduce tubidity cause by fine suspended
sediments.
What are the two typed of ATS operation? - Answer -Flow Through
Batch
What are the requirements for Flow Through ATS Use? - Answer -Need to be able to test for
residual chemicals in the field in < 1 hr to compare to allowable threshold.
Otherwise, ATS must be operated in Batch mode.
Required documents for ATS - Answer -Operation and Maintenance Manual
Monitoring, Sampling, and calibration records
Health and Safety Plan
Spill Prevention Plan
What are the ATS reporting requirements? - Answer -At minimum, upload field data to smarts
every 30 days.
For NEL violations, upload report within 24 hrs
Toxicity or water quality standard exceedances need to be reported immediately.
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, What are the Turbidity NELs for an ATS? - Answer -10 NTU for daily flow weighted average
20 NTU for any single sample.
What monitoring and sampling is required for Risk Level 1? - Answer -Quarterly non-storm
water observations.
Weekly Baseline, pre-, during, and after storm observation.
Conditional Sampling for non-visible pollutants.
What monitoring and sampling is required for Risk Level 2? - Answer -Same as 1 with:
REAP Reparation
Sample and Analyze 3 times per day for pH and Turbidity for Qualifying rain event.
What monitoring and sampling is required for Risk Level 3? - Answer -Same as 2 with:
Electronic Submission of Monitoring results withing 5 days
When Turbidity is >500 NTU, test for SSC.
Upstream and Downstream receiving water monitoring conditionall required by triggers.
Bioassessment conditionally required.
What monitoring and sampling is required for LUPs? - Answer -Daily inspections (not
documented)
For Type 2 and 3:
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