| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1141731 |
02/28/2025 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Monthly Average limit is 40 mg/L and reported value was 46.1 mg/L at M-001. |
District Operations staff increased the FFR distributor drive rotational speed to lessen dosing rates and increase treatment. The increase in the distributor drive rotational speed immediately increased treatment which was observed in the March 3rd and 6th Analytical Report provided to the District by its contract laboratory for regulatory compliance analyses collected on February 25th and 27th. Additionally, the District observed a decrease in turbidity performed on February 26th which ensured the District was achieving adequate treatment.
To prevent recurrence and ensure continued compliance, the District has contacted its contracted laboratory and requested expedited Analytical Reports so that District Operations staff can make process control changes sooner based on analytical results provided. Additionally, the District¿s new laboratory technician is performing demonstration of capabilities on BOD and TSS analysis. Following successful demonstration of capabilities, the District¿s ELAP certified laboratory will begin performing BOD and TSS analysis in house which in turn will allow for faster compliance results and operational changes for process control. (Full Report added in Attachments)
|
Violation |
U |
eSMR |
| 1131412 |
07/31/2024 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 5400 MPN/100 mL at M-001. |
To help prevent reoccurrence, the District continued to operate at an additionally elevated chlorine dosage until the potential cause was pinpointed.Operations Staff have updated its SC1 operational procedures to include the following:
1. Increased continuous return sludge pump output from 40% to 60%.
2. Twice a week (Tuesday and Friday) perform a sludge depth check of SC1, rinse the top of the SC1 manifold to verify no buildup, increase the return sludge pump output to 90% for approximately 3 hours, and monitor pump discharge for heavy solids and septicity.
3. During hydraulic flushes of the FFR, the return sludge pump output will be raised to 90% to try and minimize the potential for 'island formation' or blockage of the SC1 manifold inlet.
As of August 29th, and following the update of operational procedures, there have been no bubbles, buildup, or sludge blanket observed at SC1. These operational procedures are expected to continue until the successful startup and commissioning of the District's new activated sludge treatment process. Expected completion is February 2025. |
Violation |
U |
eSMR |
| 1131414 |
07/18/2024 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 9200 MPN/100 mL at M-001. |
To help prevent reoccurrence, the District continued to operate at an additionally elevated chlorine dosage until the potential cause was pinpointed.Operations Staff have updated its SC1 operational procedures to include the following:
1. Increased continuous return sludge pump output from 40% to 60%.
2. Twice a week (Tuesday and Friday) perform a sludge depth check of SC1, rinse the top of the SC1 manifold to verify no buildup, increase the return sludge pump output to 90% for approximately 3 hours, and monitor pump discharge for heavy solids and septicity.
3. During hydraulic flushes of the FFR, the return sludge pump output will be raised to 90% to try and minimize the potential for 'island formation' or blockage of the SC1 manifold inlet.
As of August 29th, and following the update of operational procedures, there have been no bubbles, buildup, or sludge blanket observed at SC1. These operational procedures are expected to continue until the successful startup and commissioning of the District's new activated sludge treatment process. Expected completion is February 2025.
|
Violation |
U |
eSMR |
| 1131413 |
07/12/2024 |
CAT2 |
Chlorine, Total Residual Daily Maximum limit is 1.33 mg/L and reported value was 1.99 mg/L at M-001. |
To prevent reoccurrence, the District provided remedial training to Laboratory and Operations staff to ensure resampling and analysis occurs immediately following any potential non-compliance with any District Permit limitation, and that the Chief Plant Operator is notified immediately. |
Violation |
U |
eSMR |
| 1117517 |
04/19/2023 |
OEV |
Fecal Coliform Daily Maximum limit is 400 MPN/100 mL and reported value was 16000 MPN/100 mL at M-001. |
The pump was immediately placed in manual and District Operations staff communicated the failure to the electrical contractor. The District¿s electrical contractor troubleshot the failure, found the blown fuse, and then replaced the blown fuse. Once the fuse was replaced, District Operations staff placed the system back into normal operation and ORP levels began to return to normal. The permanent tie in of the communication cables (no splices) was completed by the District¿s electrical contractor later the same day at approximately 1:15 PM. Operations staff verified both chemical pumps were operational and receiving communication following the permanent tie in.
The District does not foresee any future interruptions or repairs necessary to the communication cables now that the permanent cables have been tied in and all major excavations for the Redundancy Project are complete. Please feel free to contact me if you have any questions or concerns.
|
Violation |
U |
eSMR |
| 1115126 |
02/21/2023 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 16000 MPN/100 mL at M-001. |
Currently, District Operations staff perform a monthly inspection of the flash mixer but does not inspect the chemical feed piping internals where the blockage occurred. The internal inspection of the flash mixer injection piping has been added to the monthly work order to prevent reoccurrence of the blockage. |
Violation |
U |
eSMR |
| 1115125 |
02/15/2023 |
OEV |
Fecal Coliform Daily Average (Mean) limit is 2000 MPN/100 mL and reported value was 8024 MPN/100 mL at M-001. |
Currently, District Operations staff perform a monthly inspection of the flash mixer but does not inspect the chemical feed piping internals where the blockage occurred. The internal inspection of the flash mixer injection piping has been added to the monthly work order to prevent reoccurrence of the blockage. |
Violation |
U |
eSMR |
| 1107735 |
07/20/2022 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 2707 MPN/100 mL at M-001. |
To prevent reoccurrence, the District will operate at this higher chlorine dosage for the foreseeable future and continue to monitor processes for any changes. In addition, the District has raised its polymer dosage for its chemically enhanced primary treatment. |
Violation |
B |
eSMR |
| 1107734 |
07/14/2022 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 2400 MPN/100 mL at M-001. |
I will be meeting with my Operations staff to update our maintenance procedure so that this does not occur again. In addition, maintenance and oil sampling frequency will be mitigated upon completion of the Redundancy Project. Once the District¿s current Redundancy Project is complete, the District will be able to fully bypass the FFR to perform maintenance and rehabilitation while maintaining full treatment of the waste stream. |
Violation |
B |
eSMR |
| 1105881 |
05/19/2022 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 9.96 mg/L and reported value was 10.7 mg/L at M-001. |
The District is currently in the design phase of the Dechlorination System Improvement Project. This Improvement Project is for the relocation of the dechlorination injection point to make use of the entire volume of the chlorine contact tank effluent chamber to provide mixing and reaction time, increase mixing energy to ensure that Sodium Bisulfite is well mixed, and adequately apply Sodium Bisulfite to contact all effluent equally. Tentative completion of the Improvement Project is July 2022. |
Violation |
B |
eSMR |
| 1098617 |
11/01/2021 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 09.96 mg/L and reported value was 11.3 mg/L at M-001. |
The cause of the exceedance is unknown, but may have been due to a high demand of chlorine at the chlorine contact tank. The high chlorine demand may have caused a heavier than normal load to the de-chlorination system and therefore causing the exceedance. All processes have returned to normal since the exceedance, but operations staff will continue to monitor the system to ensure proper operation. In addition, the District has developed a scope of services with a professional engineering firm to perform an assessment of the District's disinfection system. Services include the following;
- Perform onsite inspection of the disinfection and dechlorination systems to document the existing equipment, its condition, connectivity, and control.
- Investigate physical configuration of the effluent chamber and location of instrumentation.
- Review available information on the existing control and instrumentation systems.
- Prepare a Technical Memorandum describing the system and providing recommendations for improving control of the disinfection and dechlorination system. The report will discuss if control improvements alone are recommended, or if physical improvements may be necessary.
- The Technical Memorandum will provide an assessment of additional potential improvements beyond revised loop control, such as improvements to physical configuration, location of probes, or additional features such as baffle or weirs, if warranted.
Upon completion of the Technical Memorandum and at the District¿s request, the professional engineering firm will prepare a scope and fee to prepare Construction Plans, Specifications, and Estimates for the recommended improvements. |
Violation |
B |
eSMR |
| 1096999 |
10/20/2021 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 9200 MPN/100 mL at M-001. |
The District is in the process of performing a Local Limits Study to update its Pretreatment Program. In addition, the District has developed a scope of services with a professional engineering firm to perform an assessment of the dechlorination system and provide a subsequent technical memorandum. This includes the following;
-Performing an onsite inspection of the disinfection and dechlorination system to document the existing equipment, its condition, connectivity, and control.
-Investigate physical configuration of the effluent chamber and location of instrumentation.
-Review available information on the existing control and instrumentation systems.
-Prepare a Technical Memorandum describing the system and providing recommendations for improving control of the dechlorination system. The report will discuss if control improvements alone are recommended, or if additional improvements may be warranted.
-The Technical Memorandum will provide an assessment of additional potential improvements beyond revised loop control, such as improvements to physical configuration, location of probes, or additional features such as baffle or weirs, if warranted.
Upon completion of the Technical Memorandum, the professional engineering firm will prepare a scope to prepare Construction Plans, Specifications, and Estimates for the recommended improvements. |
Violation |
B |
eSMR |
| 1094649 |
08/27/2021 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 3500 MPN/100 mL at M-001. |
Operations staff have begun chemically enhanced primary treatment (CEPT) of both primary clarifiers. Operations staff also performed a hydraulic flush of the Fixed Film Reactor followed by the draining and cleaning of the Chlorine Contact Tank. In addition, weekly rinsing of the effluent weir has been added to Operations weekly work order tasks to limit growth that could potentially affect fecal coliform analysis. These processes should enhance the treatment efficiency and assist with preventing further exceedances. |
Violation |
B |
eSMR |
| 1094650 |
08/02/2021 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 09.96 mg/L and reported value was 010.5 mg/L at M-001. |
Operations staff have begun chemically enhanced primary treatment (CEPT) of both primary clarifiers. Operations staff also performed a hydraulic flush of the Fixed Film Reactor followed by the draining and cleaning of the Chlorine Contact Tank. These processes should enhance the treatment efficiency and assist with preventing further exceedances. |
Violation |
B |
eSMR |
| 1093740 |
07/14/2021 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 16000 MPN/100 mL at M-001. |
Raised chlorine dosage at chlorine contact tank and updated monthly maintenance procedure on fixed film reactor distributor drive. Upon completion of Redundancy Project, the District will be able to fully bypass the FFR to perform maintenance and rehabilitation procedures while maintaining full treatment of waste stream through new processes. |
Violation |
B |
eSMR |
| 1086578 |
01/06/2021 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 8006 MPN/100 mL at M-001. |
The District will be updating its Standard Operating Procedure for performing CCT quarterly maintenance by changing the order in which the CCT serpentine channels are drained and rinsed. |
Violation |
B |
eSMR |
| 1078132 |
07/30/2020 |
OEV |
Fecal Coliform Daily Maximum limit is 2000 MPN/100 mL and reported value was 2200 MPN/100 mL at M-001. |
To prevent reoccurence, the District is continuing chemically enhance primary treatment, higher dosage of sodium hypocrite and increased re-circulation rate at fixed film reactor. In addition, the District performed additional fecal analysis during the weekend following the violation to ensure maintained compliance. |
Violation |
B |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
|
