| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1128018 |
04/30/2024 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 15 mg/L and reported value was 18.6 mg/L at EFF-001. |
1) Influent TSS: The levels continue to be elevated and are being monitored. No sources have been identified.
2) Secondary Clarifier: Polymer addition was previously identified as a means of quickly settling solids out of the system. The District started adding polymer to the secondary clarifier on April 24. Settling improved and TSS decreased. Polymer is kept on hand to be used as needed.
3) Biofilter: Flushing of the biofilter began in March. This is not a normal activity for the process and is being completed manually on a daily basis. The goal is to flush out the buildup of solids found in the underdrain of the unit. Filter media replacement is being considered and information from vendors and contractors is being solicited.
|
Violation |
U |
eSMR |
| 1126520 |
03/31/2024 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 15 mg/L and reported value was 19.6 mg/L at EFF-001. |
Corrective actions implemented include:
1) Influent TSS: The Collections Lead was questioned to capture any observations in the community and collections system where additional solids may be being introduced. No potential sources were identified, but collections staff will be on the lookout. The District additionally solicited the same information from the contracting entity that conducts pretreatment inspections.
2) Secondary Clarifier: Polymer addition was previously identified as a means of quickly settling solids out of the system. The District added polymer to the secondary upon realization of the permit limit exceedance; however, there was limited supply on site. Additional polymer was obtained on April 24th and it was implemented the same day.
3) Biofilter: Flushing of the biofilter was initiated. This is not a normal activity for the process and is being completed manually on a daily basis. The goal is to flush out the buildup of solids in the underdrain of the unit. The potential of filter media replacement is being considered and information from vendors and contactors is being solicited. Additionally, aeration of the influent to the biofilter was initiated. The intention is to increase dissolved oxygen in the biofilter to create an environment that is less hospitable to tubifex.
|
Violation |
U |
eSMR |
| 1115055 |
02/28/2023 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average (Mean) limit is 15 mg/L and reported value was 20.8 mg/L at EFF-001. |
Upon realization of the excessive flushing, we began accelerated process control analyses to carefully monitor treatment efficiency. Using a SCADA programming contractor, we investigated possible program failures that may have caused the over flushing. No programming issue was identified. We also sought recommendations for improving settling in the secondary clarifier when solids suddenly increase. A polymer blend was identified and purchased. The necessary additional pumps were ordered, and installation of the chemical dosing system is anticipated by the end of March. Additionally, a new rule was instituted disallowing biotower flushing at any time that staff is not physically present. |
Violation |
U |
eSMR |
| 1112706 |
12/31/2022 |
OEV |
Enterococci Monthly 90th% limit is 110 MPN/100 mL and reported value was 920.8 MPN/100 mL at EFF-001. |
The District is working with the UV project contractor to have all bulbs that fall within the lot numbers that have the known defect replaced immediately. Additionally, the District provided the contractor with plant performance data to verify whether there are any other issues that need to be addressed. |
Violation |
U |
eSMR |
| 1089553 |
03/31/2021 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 15 mg/L and reported value was 15.6 mg/L at EFF-001. |
Investigation into elevated TSS began in February and is still underway. Potential contributing factors were identified and then further investigated. Any operational changes that could potentially assist in reducing TSS were implemented. A cause for the elevated TSS is not yet known. The District has contracted with an engineering firm with process expertise to assist in continuing the investigation. Further corrective actions will be identified and implemented upon completing of the investigation. The facility is currently in compliance with TSS. |
Violation |
U |
eSMR |
| 1088183 |
02/28/2021 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average (Mean) limit is 15 mg/L and reported value was 18 mg/L at EFF-001. |
Operations staff implemented several corrective actions, such as: 1) Modifying the routine operation of the biotower by decreasing flushing and recirculating. 2) Investigating and ensuring all valves and connections between process units are stable and as expected. Additionally, the District has requested proposals from engineering firms with wastewater process expertise to conduct further investigation and propose additional corrective actions. The District will award the project to a firm by 3/31/21.
|
Violation |
U |
eSMR |
| 1088181 |
02/18/2021 |
CAT1 |
Ammonia, Total (as N) Daily Maximum limit is 4.7 mg/L and reported value was 4.8 mg/L at EFF-001. |
Operations staff implemented several corrective actions, such as: 1) Modifying the routine operation of the biotower by decreasing flushing and recirculating. 2) Engaging a wastewater microbiologist to evaluate the micro activity in the treatment units. 3) Investigating and ensuring all valves and connections between process units are stable and as expected. Additionally, the District has requested proposals from engineering firms with wastewater process expertise to conduct further investigation and propose additional corrective actions. The District will award the project to a firm by 3/31/21. |
Violation |
U |
eSMR |
| 1088182 |
02/13/2021 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average (Mean) limit is 25 mg/L and reported value was 32 mg/L at EFF-001. |
Operations staff implemented several corrective actions, such as: 1) Modifying the routine operation of the biotower by decreasing flushing and recirculating. 2) Investigating and ensuring all valves and connections between process units are stable and as expected. Additionally, the District has requested proposals from engineering firms with wastewater process expertise to conduct further investigation and propose additional corrective actions. The District will award the project to a firm by 3/31/21.
|
Violation |
U |
eSMR |
| 1086903 |
01/31/2021 |
CAT1 |
Ammonia, Total (as N) Monthly Average (Mean) limit is 1.6 mg/L and reported value was 2.8 mg/L at EFF-001. |
Corrective actions/operational strategies taken:
1. No flushing of the biotower has occurred since 1/12/21 to allow microbiological regrowth.
2. Refresher training for all operators on how to start a flush cycle and recognize whether an additional pump may be triggered.
|
Violation |
U |
eSMR |
| 1086902 |
01/27/2021 |
CAT1 |
Ammonia, Total (as N) Daily Maximum limit is 4.7 mg/L and reported value was 4.8 mg/L at EFF-001. |
Corrective actions/operational strategies taken:
1. No flushing of the biotower has occurred since 1/12/21 to allow microbiological regrowth.
2. Refresher training for all operators on how to start a flush cycle and recognize whether an additional pump may be triggered.
|
Violation |
U |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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