| 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 |
| 1069898 |
12/19/2019 |
Surface Water |
On December 19 2019, RSW-002 temperature at Roseville''s Dry Creek WWTP was 57 degrees Fahrenheit and exceeded the RSW-001 temperature by 6 degrees Fahrenheit. This exceeds the NPDES temperature difference limit of 5 degrees Fahrenheit. |
The exceedance occurred because of extremely low upstream flow and cold nighttime atmospheric temperatures. Plant effluent cooling system was in operation and will continue to be used while these conditions persist. |
Violation |
B |
eSMR |
| 1068478 |
11/25/2019 |
Surface Water |
On 25 November 2019, Dry Creek RSW-002 Receiving Water temperature was 62 degrees Fahrenheit and exceeded the RSW-001 temperature by 6 degrees Fahrenheit. This exceeds the NPDES temperature difference limit of 5 degrees Fahrenheit. |
This exceedance occurred because Dry Creek has low flow due to the dry conditions and the cold overnight temperatures cause the overnight creek temperature to be extremely low. The plant effluent cooling system will continue to be used while these conditions persist. |
Violation |
B |
eSMR |
| 1068477 |
11/14/2019 |
Surface Water |
On 14 November 2019, Dry Creek RSW-002 Receiving Water temperature was 61 degrees Fahrenheit and exceeded the RSW-001 temperature by 6 degrees Fahrenheit. This exceeds the NPDES temperature difference limit of 5 degrees Fahrenheit. |
This exceedance occurred because Dry Creek has low flow due to the dry conditions and the cold overnight temperatures cause the overnight creek temperature to be extremely low. The plant effluent cooling system will continue to be used while these conditions persist. |
Violation |
B |
eSMR |
| 1068479 |
11/14/2019 |
Surface Water |
On November 14, 2019,the average daily temperature of 16.3 degrees Centigrade /61 degrees Fahrenheit at Roseville¿s Dry Creek RSW-002 exceeded the NPDES daily average temperature requirement of 15.6 degrees Centigrade/60 degrees Fahrenheit. |
This exceedance occurred because Dry Creek has low flow due to the dry conditions. The plant effluent cooling system will continue to be used while these conditions persist. |
Violation |
B |
eSMR |
| 1066598 |
10/31/2019 |
Surface Water |
On October 31, 2019, the RSW-002 temperature at Roseville¿s Dry Creek WWTP was 54 degrees Fahrenheit and exceeded the RSW-001 temperature by 7 degrees Fahrenheit. This is a violation of the Municipal General Order Enrollee Number R5-2017-0085-004 Section VII.1., which also refers to the Municipal General Order R5-2017-0085 Section VI.A.16.d. |
The greater than 50F increase in the natural temperature of the receiving water occurred because of the extremely low upstream flow in Dry Creek and cooling nighttime atmospheric temperatures. The plant effluent cooling system was operating and will continue to be used while these conditions persist. |
Violation |
B |
eSMR |
| 1061654 |
06/30/2019 |
DMON |
Monthly Hardness monitoring of RSW-001 was not performed in June 2019 |
Receiving Water Hardness monitoring requirement has been reinforced to the Lab staff. |
Violation |
U |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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