| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1142106 |
02/04/2025 |
UAUTHDISC |
the Pioneer Reservoir on 04 February 2025. The lapse sodium bisulfite dosing likely resulted in a discharge of treated wastewater with residual chlorine above the effluent limitations identified in the WDRs. The Discharger estimated that elevated levels of residual chlorine were discharged for approximately four minutes at the beginning of the discharge event. |
|
Violation |
B |
Report |
| 1141696 |
02/04/2025 |
Surface Water |
During Event #3, the turbidity increased from the upstream receiving water location (RSW-001; Delta King 29.1 NTU) to the downstream receiving water location (RSW-002; Miller Park 51.3 NTU) by greater than 20%, The turbidity decreased from the upstream receiving water location (RSW-003; Westin Boat Dock 40.5 NTU) to the downstream receiving water location (RSW-004; Zacharias Park 24.9 NTU), meeting receiving water limitations. It¿s important to note that RSW-004 (24.9 NTU), the furthest downstream, received water was lower than RSW-001 (29.1 NTU), further indicating that the CSS is not contributing to increased turbidity in the Sacramento River during CSO events.
During CSO events in the past, receiving water limitations for turbidity have occasionally been exceeded. Previous evaluations have determined that turbidity can vary in the Sacramento River over the course of storm events, but the variability was not necessarily related to CSO events. Additionally, during prior turbidity self-reported violations, the Central Valley Regional Water Quality Control Board (CVRQCB) noted that the CSS was not the only contributor to turbidity during the event, and the Notice of Violation was reversed.
|
Corrective Actions: If a discrepancy of more than 20% where the natural turbidity is between 5 and 50 NTU, an increase of more than 10 NTU where the natural turbidity is between 50 and 100 NTUs, or an increase of more than 10% where natural turbidity is greater than 100 NTUs is noted at the time of sampling between readings or a potential violation of the receiving water limitation for turbidity, a sample will be collected, and a turbidity analysis from the analytical laboratory. The City will use laboratory values as the primary compliance measurement when both field meter readings and laboratory results are available. |
Violation |
B |
eSMR |
| 1138442 |
11/22/2024 |
Surface Water |
Receiving Water Violation:
During Event #1, the turbidity increased from the upstream receiving water location (16.3 NTU, RSW-001; Delta King) to the downstream receiving water location (31.4 NTU, RSW-002; Miller Park) by greater than 20%, exceeding the receiving water limitations.
During CSO events in the past, receiving water limitations for turbidity have occasionally been exceeded. Previous evaluations have determined that turbidity can vary in the Sacramento River over the course of storm events, but the variability was not necessarily related to CSO events.
Additionally, during prior turbidity self-reported violations, the Central Valley Regional Water Quality Control Board (CVRQCB) noted that the CSS was not the only contributor to turbidity during the event, and the Notice of Violation was reversed.
|
Corrective Actions: If a discrepancy of more than 20% where the natural turbidity is between 5 and 50 NTU, an increase of more than 10 NTU where the natural turbidity is between 50 and 100 NTUs, or an increase of more than 10% where natural turbidity is greater than 100 NTUs is noted at the time of sampling between readings or a potential violation of the receiving water limitation for turbidity, a sample will be collected, and a turbidity analysis from the analytical laboratory. The City will use laboratory values as the primary compliance measurement when both field meter readings and laboratory results are available. |
Violation |
B |
eSMR |
| 1139332 |
02/19/2024 |
CAT1 |
Total Suspended Solids (TSS), Percent Removal Annual Average (Mean) limit is 100 % and reported value was 112.5 % at EFF-006. |
The City has analyzed the TSS exceedances alongside its collected TSS samples, which indicate that the annual average may have remained within 100mg/L/ (However, the City's samples are not reported to CIWQS). Moving forward, the City will review the Plan of Operations to identify opportunities for potentially mitigating future exceedances of the TSS annual average effluent limitation. |
Violation |
B |
eSMR |
| 1096529 |
11/02/2021 |
LREP |
Monthly SMR ( MONNPDES ) report for September 2021 (2384736) was due on 01-NOV-21 |
|
Violation |
B |
Report |
| 1097408 |
10/24/2021 |
Surface Water |
The bacteria levels in receiving water exceeded the 320 colony forming units (cfu)/100 mL E. coli statistical threshold value (STV; not to be exceeded by more than 10% of samples during a calendar month) at all downstream receiving water sites, RSW-002 (Miller Park), RSW-003 (Westin) and the alternate RSW-004 site (RSW-GSB; Garcia Bend). |
Effluent E. coli from Pioneer Reservoir EFF-006 and the Combined Wastewater Treatment Plant (CWTP) EFF-002 to which the receiving water limitations apply both had non-detects for E. coli, indicating that the receiving water limitation was not exceeded due to the treated CSS discharges.
However, E. coli levels in the untreated discharge from EFF-004 exceeded the STV, and the downstream sample at RSW-003 also exceeded the STV which is a receiving water violation for that one sample. |
Violation |
B |
eSMR |
| 1099441 |
10/24/2021 |
Surface Water |
The bacteria levels in receiving water exceeded the 320 colony forming units (cfu)/100 mL E. coli statistical threshold value (STV; not to be exceeded by more than 10% of samples during a calendar month) at all downstream receiving water sites, RSW-002 (Miller Park), RSW-003 (Westin) and the alternate RSW-004 site (RSW-GSB; Garcia Bend). |
Effluent E. coli from Pioneer Reservoir EFF-006 and the Combined Wastewater Treatment Plant (CWTP) EFF-002 to which the receiving water limitations apply both had non-detects for E. coli, indicating that the receiving water limitation was not exceeded due to the treated CSS discharges.
However, E. coli levels in the untreated discharge from EFF-004 exceeded the STV, and the downstream sample at RSW-003 also exceeded the STV which is a receiving water violation for that one sample. |
Violation |
B |
eSMR |
| 1097407 |
10/24/2021 |
Surface Water |
The turbidity increase from the upstream (RSW-001; Delta King) to downstream (RSW-002; Miller Park) receiving water exceeded the receiving water limitation of more than 1 NTU where natural turbidity is between 1 and 5 NTUs with an increase from 3.10 NTU upstream to 5.48 NTU downstream. |
Turbidity data from the downstream United States Geological Survey (USGS) gauge at Freeport showed a trend of low turbidity (<5 NTU) at the beginning of the storm and increasing to over 40 NTU after the storm. The turbidity increase from upstream to downstream of EFF-006 discharge was not evident in later samples collected during the discharge event (upstream and downstream of EFF-002 discharge, or upstream and downstream of EFF-004 discharge) and was likely due to inputs other than CSS discharge. |
Violation |
B |
eSMR |
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Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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