| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1122916 |
11/16/2023 |
Surface Water |
On 11/16/2023, the daily average temperature at RSW-002 for Dry Creek WWTP was 16.3°C (61°F) which exceeded the NPDES limit of 15.6°C (60°F) for the month of November. |
This was determined to be due to rapidly dropping atmospheric temperature along with low water flows in the creek. The set point for the cooling towers have been adjusted to promote maximum cooling of the Final Effluent to prevent future exceedances. |
Violation |
B |
eSMR |
| 1110633 |
10/18/2022 |
DMON |
Upon completion of planned server maintenance on 10/18/22, an issue with the buffered data synchronization between our SCADA and historian servers went undetected until around 3 hours following a plant diversion resulting in continuous monitoring data loss at UVS-001 for this period. |
Further investigation revealed that the data loss experienced appears to have been the result of a time discrepancy between the SCADA and historian servers after they were brought online following completion of the scheduled maintenance. The virtual servers will be configured from the default UTC to PST time zones manually to avoid any delay in time synchronization when they come online. In addition, checks will be performed following maintenance to ensure data synchronization is working as expected. |
Violation |
B |
eSMR |
| 1110634 |
10/18/2022 |
DMON |
Upon completion of planned server maintenance on 10/18/22, an issue with the buffered data synchronization between our SCADA and historian servers went undetected until around 3 hours following a plant diversion, resulting in continuous monitoring turbidity data loss at FIL-001 for this period.
|
Further investigation revealed that the data loss experienced appears to have been the result of a time discrepancy between the SCADA and historian servers after they were brought online following completion of the scheduled maintenance. The virtual servers will be configured from the default UTC to PST time zones manually to avoid any delay in time synchronization when they come online. In addition, checks will be performed following maintenance to ensure data synchronization is working as expected. |
Violation |
B |
eSMR |
| 1103751 |
03/15/2022 |
DMON |
On 3/15/2022, Final Effluent Grab temperature was not recorded leading to a deficient monitoring violation |
The daily compliance recording of the Final effluent grab temperature requirement has been re-emphasized to the laboratory personnel.
|
Violation |
B |
eSMR |
| 1098091 |
11/04/2021 |
Surface Water |
On November 4, 2021 , the average daily RSW-002 temperature of 16.1 degree Centigrade/ 61 degree Fahrenheit exceeded the NPDES permit daily average temperature requirement of 15.6 degree Centigrade/ 60 degree Fahrenheit. |
These exceedances occurred because of the lower upstream flow in Dry Creek along with cold nighttime atmospheric temperatures and higher than normal daytime atmospheric temperatures.
The plant effluent cooling system is in full operation and will continue to be used while these conditions persist.
|
Violation |
B |
eSMR |
| 1097033 |
10/25/2021 |
Order Conditions |
On 10/25/2021, daily minimum hourly UV dose was 97.7 mJ/cm2 respectively. This is below the required daily minimum hourly average UV dose of at least 100 mJ/cm2. |
Daily minimum hourly UV dose violation occurred because of heavy torrential rains that caused fluctuations in the UV disinfection system due to continuous, extremely high flows that overwhelmed the plant process. |
Violation |
B |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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