| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1142677 |
03/23/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1142676 |
03/22/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1142675 |
03/21/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1142674 |
03/20/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1142678 |
03/19/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1142673 |
03/18/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff reviewed the treatment process, sampling, and laboratory procedures. No issues were found with the processes or performance, as the disinfection facility maintained adequate chlorine residual and contact time. The city is currently migrating SCADA systems and will ensure the control logic for the disinfection system is working properly. |
Violation |
U |
eSMR |
| 1141762 |
02/03/2025 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was .125 mg/L at EFF-001A. |
The City's SCADA vendor performed a diagnostic on the system and determined there was a loop detection on the SCADA network, which caused issues with both the PID loop performance and alarm callout. The network has been restored, and the City will review the network equipment and connections to ensure the integrity of the system. |
Violation |
U |
eSMR |
| 1140652 |
01/11/2025 |
DMON |
The eSMR is missing a required result for Total Coliform at location UVS-001A for January 11, 2024. A City laboratory analyst confused the in-progress test tubes for samples collected on January 11, for completed analysis test tubes and the samples were discarded mid test. |
Laboratory management has reviewed the importance of attention to detail, and laboratory process with all laboratory staff. The City expects this is an isolated incident and does not expect this to be a reoccurring issue. |
Violation |
U |
eSMR |
| 1139594 |
12/17/2024 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.201 mg/L at EFF-001A. |
The City recently updated the dechlorination unit processes and is working through startup issues, and is migrating SCADA systems. To prevent future occurrences, staff will evaluate and ensure there are sufficient alarms in place to properly notify staff |
Violation |
B |
eSMR |
| 1132991 |
08/09/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1132989 |
08/08/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1132988 |
08/06/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1132990 |
08/05/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1131503 |
07/01/2024 |
CAT1 |
Ammonia, Total (as N) Weekly Average (Mean) limit is 4.1 mg/L and reported value was 5.4 mg/L at EFF-001B. |
The issue has been reviewed with operations staff, permit requirements and limits have been posted at each sample location, and protocols have been put in place to ensure greater communication between sampling staff and the operator in charge. |
Violation |
B |
eSMR |
| 1130196 |
06/07/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1130195 |
06/06/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1130194 |
06/05/2024 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
Staff evaluated the treatment process, sampling and laboratory procedures. No issues were noted with the treatment process as the disinfection facility yielded sufficient chlorine residual and contact time. Staff suspects contamination was introduced through the sample collection process and have updated the sampling equipment and retrained staff to ensure proper sample collection. |
Violation |
B |
eSMR |
| 1128846 |
05/16/2024 |
Order Conditions |
Board staff received several odor complaints regarding the Sutter Plant in 2023 and 2024. During the inspection, Board staff investigated the area from which the complaints originated, spanning from Ustick Rd to Carter Ave and continuing through Carter Ave to Dallas St. While walking through this area, the odor was particularly noticeable, especially at the intersections of Ustick Rd and Carter
Ave, as well as Carter Ave and Bollinger Ct. According to the Discharger, efforts are actively underway to identify and eliminate the source of the odor. The Discharger mentioned during the inspection that it is working with its consultant to develop a workplan that will identify the source of the odor and outline recommendations to eliminate it. According to WDRs 99-112 Provision B.6, “objectionable odor originating at this facility shall not be perceivable beyond the limits of the disposal areas, wastewater transmission lines, or property owned by the Discharger.” Additionally, WDRs R5-2017-0085-002 Provision VII.C.4.c.v requires that objectionable odors shall not be perceivable beyond the limits of the facility. Since Board staff identified objectionable odors outside the Facility’s boundaries during the inspection, in violation of WDRs 99-112 and WDRs R5-2017-0085-002. |
|
Violation |
B |
Inspection |
| 1132652 |
02/02/2024 |
DMON |
City of Modesto:
The Discharger failed to monitor effluent pH for 2 February 2024. |
|
Violation |
B |
Report |
| 1124652 |
01/27/2024 |
DMON |
The eSMR is missing a required result for Total Coliform on January 27, 2024 at location UVS-002A. Both Phase I and II discharge were in bypass mode for the day at the direction of operations management. Operations staff mistakenly discharged from Phase II for a total of ten minutes in the afternoon; equating to 0.24 MGD discharge, as indicated in attachment B of the eSMR, without collecting a sample for Total Coliform as required by the permit. |
Operations staff have been coached in this matter and the sampling requirements have been reviewed. |
Violation |
U |
eSMR |
| 1118268 |
05/28/2023 |
Deficient Reporting |
The eSMR is missing a required result at location INF-001 for Conductivity for the week of May 28, 2023. A mix up within the City laboratory led to the sample being discarded before being analyzed. |
Laboratory staff have been reminded of internal process and policies to track samples as they move through the laboratory. |
Violation |
B |
eSMR |
| 1118269 |
05/09/2023 |
DMON |
On 9 May 2023, TRWQCF staff did not conduct field analysis for the plant influent (INF-001) pH grab resulting in deficient monitoring. |
Staff was retrained on the monitoring requirements and additional alarms were established. |
Violation |
U |
eSMR |
| 1117512 |
04/17/2023 |
DMON |
On 17 April 2023, the continuous monitoring equipment located at the TRWQCF effluent monitoring station (EFF-001A) was left in hold after routine analyzer maintenance. Unfortunately, both the monitoring analyzers for total chlorine residual and the dechlorination agent was left in hold for 2.5 hours resulting in deficient monitoring with the total residual effluent limitation. |
In an effort to ensure chlorine was absent, staff coordinated with City of Modesto and intercepted the effluent to an emergency holding basin located at the Modesto¿s Facility. Staff confirmed the absence of total chlorine and then continued pumping to the Delta Mendota Canal (EFF-002). To ensure compliance with this order, the monitoring analyzer standard operating procedure was updated and staff was retrained. |
Violation |
U |
eSMR |
| 1116029 |
03/28/2023 |
Order Conditions |
The eSMR contains a maximum turbidity result over the 0.5 NTU permitted limit. On March 28, 2023 at 04:57:48, the in-line turbidity meter at location UVS-002 reached a result of 0.18 NTU. This result triggered an automatic bypass of the phase II system. In the time it took for the bypass gate to fully close (ten seconds) the in-line meter had spiked at the reported maximum of 2.82 NTU. |
This is an incontrollable anomaly and the City does not anticipate another occurrence. |
Violation |
U |
eSMR |
| 1116026 |
03/08/2023 |
Order Conditions |
Upon review of the monitoring data submitted by the City of Turlock, there were instances of effluent turbidity exceeding WDRs’ prescribed limits. Specifically, during the month of February 2023, the effluent turbidity exceeded the limit for 11 days. For the month of March 2023, the effluent turbidity exceeded the limit for 18 days. These effluent turbidity excursions ranged between 3 NTUs and 5 NTUs which is violation of WDRs. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1116030 |
03/06/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 5 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1116037 |
03/03/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115105 |
02/28/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115099 |
02/28/2023 |
Order Conditions |
Turbidity Other limit is 5 NTU and reported value was 5 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115104 |
02/27/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115101 |
02/26/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115100 |
02/22/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115098 |
02/21/2023 |
Order Conditions |
Upon review of the monitoring data submitted by the City of Turlock, there were instances of effluent turbidity exceeding WDRs’ prescribed limits. Specifically, during the month of February 2023, the effluent turbidity exceeded the limit for 11 days. For the month of March 2023, the effluent turbidity exceeded the limit for 18 days. These effluent turbidity excursions ranged between 3 NTUs and 5 NTUs which is violation of WDRs, see Table A below for list of violations. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115103 |
02/20/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115102 |
02/19/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
The chemical rehabilitation project is expected to reach substantial completion in May of 2023. |
Violation |
B |
eSMR |
| 1115106 |
02/10/2023 |
DMON |
The eSMR is missing a required pH grab result from location EFF-001B on February 10, 2023. Operations staff in charge of samples on February 10th believed the plant to be in full bypass and not discharging to receiving water. This lead the operator collecting samples to not take the grab pH sample at location EFF-001B required by the permit. |
The operator in question has received coaching in this matter and the City does not anticipate a future occurrence.
While the city does not have the required grab result, we do have a pH result of 7.23 SU from the in-line meter at location EFF-001B at the same time of sample collection on February 10th. The City has included in this report Attachment G which is a comparison of pH results from grab samples and the in-line meter results taken at the same time as sample collection during the month of February in the hopes that the Board will consider this an acceptable substitution in this case.
|
Violation |
B |
eSMR |
| 1113986 |
01/15/2023 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 3.7 MPN/100 mL at EFF-001A. |
Optimize the disinfection system to ensure total coliform limits are met. |
Violation |
B |
eSMR |
| 1113987 |
01/08/2023 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Optimize the tertiary system to ensure compliance with the turbidity requirements. |
Violation |
B |
eSMR |
| 1112853 |
12/05/2022 |
DMON |
The eSMR is missing required Ammonia results from location EFF-001B for the weeks of December 5 and December 12, 2022. Staff turnover in the City laboratory led to the samples not being sent to the contracted laboratory as needed. |
City laboratory staff have all received coaching regarding the importance of sampling receiving and tracking in the lab. The City believes this will not be a continuing issue. |
Violation |
B |
eSMR |
| 1112014 |
08/21/2022 |
Order Conditions |
Turbidity instantaneous maximum limit is 0.5 NTU and reported value was 4.6 NTU at UVS-001A. |
|
Violation |
B |
Report |
| 1112012 |
07/31/2022 |
CAT2 |
Dibromochloromethane Monthly Average limit is 19 ug/L and reported value was 19.9 ug/L at EFF-001A. |
|
Violation |
B |
Report |
| 1105756 |
05/29/2022 |
DMON |
The eSMR is missing a required results for BOD at locations INF-001 and EFF-001B for May 29, 2022. The Laboratory missed the readback time for BOD and the results for the batch were deemed unreportable. |
Laboratory staff have been reminded of their responsibilities to check timelines for set and readback runtimes and adhere to the method requirements. The city does not foresee this being a reoccurring issue. |
Violation |
U |
eSMR |
| 1128845 |
03/22/2022 |
Order Conditions |
Based on the influent calibration records, the annual calibration of the influent
Parshall flumes was overdue, as it is required on 20 January 2022. According to
MRP Provision I.D of the WDRs, “Appropriate flow measurement devices and
methods consistent with accepted scientific practices shall be selected and used
to ensure the accuracy and reliability of measurements of the volume of
monitored discharges. All monitoring instruments and devices used by the
Discharger to fulfill the prescribed monitoring program shall be properly
maintained and calibrated as necessary, at least yearly, to ensure their continued
accuracy. All flow measurement devices shall be calibrated at least once per
year to ensure continued accuracy of the devices.” |
|
Violation |
B |
Inspection |
| 1128844 |
03/22/2022 |
Order Conditions |
During the inspection, it was discovered that one of the UV module’s bulbs
exceeded the manufacture’s recommended hours, 12,000 run hours, by 471
hours. According to the Standard Provision I.D, “The Discharger shall, at all
times, properly operate and maintain all facilities and systems of treatment and
control (and related appurtenances) which are installed or used by the Discharger to achieve compliance with the conditions of this Order.” According to
the Discharger, it was due to an oversight and the Discharger will replace the
bulbs and update the Standard Operating Procedures (SOPs) to ensure the
bulbs not exceeding the recommended hours in the future. |
|
Violation |
B |
Inspection |
| 1103440 |
03/18/2022 |
Order Conditions |
The eSMR does not include required results for BOD at location INF-001B for March 18, 20, and 21 and also at location EFF-001B for March 20, and 21, 2022 due to QC failures. |
The City laboratory is researching alternative seed locations to ensure a more reliable quality control result. |
Violation |
U |
eSMR |
| 1102742 |
02/03/2022 |
Order Conditions |
The eSMR does not include required results for BOD at location INF-001B and EFF-001B for February 3, 2022 due to an instrumentation programming failure, as well as a procedural breakdown during initial set up in the City laboratory. |
Set up procedure has been reviewed with laboratory staff to avoid future occurrences of this issue. |
Violation |
U |
eSMR |
| 1103439 |
02/01/2022 |
Order Conditions |
In February 2022 it was discovered that the UV lamps in bank 1B of phase II were 471 hours over the manufacturer¿s specifications of 12,000 run hours. |
Since this discovery the City has added a signed daily check of the UV HMI hours of an update by operators to reflect the highest lamp hours. Programing in the HMI was also updated to auto alert SCADA when lamp hours approach 11,800 hours to ensure that the UV lamps are always replaced before exceeding specification. |
Violation |
U |
eSMR |
| 1101265 |
01/17/2022 |
OEV |
Total Coliform Instantaneous Maximum limit is 240 MPN/100 mL and reported value was 540 MPN/100 mL at EFF-001A. |
Staff revisited proper sample collections and laboratory methods. |
Violation |
B |
eSMR |
| 1099777 |
12/21/2021 |
DMON |
The eSMR does not include required results for BOD at locations INF-001 and EFF-001B for December 21 ¿ 23, 2021. |
The City laboratory experienced a QC failure due to a seed strength issue. The City believes that the unusually low concentration from the seed location may be attributed to the exceptional amount of rain experienced in December 2021. |
Violation |
U |
eSMR |
| 1097360 |
10/23/2021 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 4.042 mg/L at EFF-001A. |
To prevent future occurrences, staff as implemented routine checks on the alarm notification system and the City is in discussions with the vendor to possibly update the hardware and software. Staff also confirmed that the de-chlorination system is fully functional. |
Violation |
B |
eSMR |
| 1097361 |
10/23/2021 |
CAT2 |
Chlorine, Total Residual 4-Day Average (Mean) limit is 0.011 mg/L and reported value was .042 mg/L at EFF-001A. |
To prevent future occurrences, staff as implemented routine checks on the alarm notification system and the City is in discussions with the vendor to possibly update the hardware and software. Staff also confirmed that the de-chlorination system is fully functional. |
Violation |
B |
eSMR |
| 1092661 |
06/01/2021 |
Order Conditions |
On June 1, 2021 at 17:43 a lap in one of the UV vessels hit 12,000 run hours. This went un-noticed until June 2, 2021 at 09:43. During that 16-hour window the flow through the vessel was 635,889 gallons. |
The lamp was immediately replaced. To avoid these issues in the future, the City of Modesto has implemented a daily documentation of lamp run hours and installed a SCADA system alarm to alert at 11,800 run hours. When the alarm alerts, operations staff will create a work order and immediately notify operations and maintenance supervisors. |
Violation |
U |
eSMR |
| 1090687 |
04/29/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090672 |
04/28/2021 |
Order Conditions |
Turbidity Annual Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090674 |
04/27/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090684 |
04/26/2021 |
Order Conditions |
Turbidity Annual Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090683 |
04/23/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090682 |
04/22/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 6 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090680 |
04/22/2021 |
Order Conditions |
Turbidity Instantaneous Maximum limit is 10 NTU and reported value was 10 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090681 |
04/21/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 8 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090679 |
04/21/2021 |
Order Conditions |
Turbidity Instantaneous Maximum limit is 10 NTU and reported value was 10 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090673 |
04/21/2021 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.170 mg/L at EFF-001A. |
To prevent future occurrences, staff reviewed the Standard Operating Procedures related to the startup of the dechlorination facility to ensure its accuracy and retrain staff on these procedures. |
Violation |
B |
eSMR |
| 1090670 |
04/20/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090669 |
04/19/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
Staff conducted follow up inspection and industrial user corrected the issue |
Violation |
B |
eSMR |
| 1090677 |
04/17/2021 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.0 MPN/100 mL at EFF-001A. |
The SCADA system was completely restored on 26 April 2021. |
Violation |
U |
eSMR |
| 1090675 |
04/16/2021 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
The SCADA system was completely restored on 26 April 2021. |
Violation |
B |
eSMR |
| 1090678 |
04/15/2021 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at EFF-001A. |
The SCADA system was completely restored on 26 April 2021. |
Violation |
U |
eSMR |
| 1090686 |
04/15/2021 |
CAT1 |
Aluminum, Total Monthly Average limit is 330 ug/L and reported value was 373 ug/L at EFF-001A. |
The SCADA system was completely restored on 26 April 2021. |
Violation |
B |
eSMR |
| 1090671 |
04/14/2021 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.0 MPN/100 mL at EFF-001A. |
The SCADA system was completely restored on 26 April 2021 |
Violation |
B |
eSMR |
| 1090676 |
04/13/2021 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.0 MPN/100 mL at EFF-001A. |
The SCADA system was completely restored on 26 April 2021. |
Violation |
U |
eSMR |
| 1090685 |
04/04/2021 |
DMON |
The eSMR does not include required weekly results for conductivity at locations DMC-001 and DMC-002 for the week of April 4, 2021. Though the required samples were collected, an error within the laboratory caused them to be discarded before analysis. Discovery of the processing error did not occur until after the week had ended, making resample impossible. |
The City of Modesto laboratory has reviewed its sample processing policy and procedures with staff to safeguard proper processing of all samples in the future. |
Violation |
B |
eSMR |
| 1088226 |
02/12/2021 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.065 mg/L at EFF-001A. |
Improve dechlorination control logic to prevent future occurrences. |
Violation |
B |
eSMR |
| 1093909 |
02/08/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093908 |
02/07/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093907 |
02/06/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093906 |
02/05/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093905 |
02/04/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093904 |
02/03/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093903 |
02/02/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1093902 |
02/01/2021 |
Order Conditions |
Turbidity Daily Average (Mean) limit is 2 NTU and reported value was 4 NTU at EFF-001A. |
|
Violation |
B |
Report |
| 1086918 |
01/13/2021 |
Order Conditions |
Turbidity Instantaneous Maximum limit is 10 NTU and reported value was 10 NTU at EFF-001A. |
The gate valve has been removed from remote operation until the communication signal can be restored to prevent future occurrences. |
Violation |
B |
eSMR |
| 1088689 |
01/09/2021 |
CAT1 |
Total Suspended Solids (TSS) Daily Maximum limit is 2400 lb/day and reported value was 3175 lb/day at EFF-001B. |
|
Violation |
B |
Report |
| 1088688 |
01/05/2021 |
CAT1 |
Total Suspended Solids (TSS) Daily Maximum limit is 20 mg/L and reported value was 39 mg/L at EFF-001B. |
|
Violation |
B |
Report |
| 1088690 |
12/21/2020 |
Surface Water |
According to the WDRs Provision V.A.15, ¿The natural temperature to be increased by more than 5°F. Compliance to be determined based on the difference in temperature at Monitoring Locations DMC-001 and DMC-002.¿ On 21 December 2020, the effluent caused the receiving water temperature to increase 6.5°F, which a violation of WDRs (CIWQS Violation ID #). |
|
Violation |
B |
Report |
| 1083368 |
11/21/2020 |
OEV |
Total Coliform Instantaneous Maximum limit is 240 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001A. |
Retrained staff on proper sample collection and handling practices. |
Violation |
U |
eSMR |
| 1082168 |
10/06/2020 |
DMON |
The eSMR for October 2020 does not include Flow results at location INF-001 from October 6-7, 2020. The City of Modesto¿s Ignition SCADA system had an issue with the vendor database server on October 6th, 2020, which interrupted data collection. |
City IT staff and the City¿s contracted system integrator (Telstar) identified the root cause of the issue to be a missing server license. Telstar purchased the server license initially and after investigating their order workflow, Telstar reported that the licensing was still registered to one of their buyers and wasn¿t applied to the system. Telstar then had to re-register the server license with their company, download the licensing, and apply the license the City¿s database server to get the system back online. The system came back online and resumed data collection October 8th, 2020 at 2pm. The data was lost for October 6th and 7th, and cannot be recovered. City IT staff is currently working with Telstar to implement failover and notification options for the Ignition SCADA system, along with verifying server licensing for all SCADA servers. |
Violation |
U |
eSMR |
| 1078916 |
07/06/2020 |
DMON |
The eSMR is missing a result for BOD, TSS and Hardness at location EFF-001B for July 6, 2020. The composite sampler at the site suffered a malfunction overnight leaving little volume that was not representative of the discharge. |
City operations staff will be conduction a comprehensive analysis of sampler conditions. City staff will then upgrade and replace samplers as needed. Completion of the analysis and samplers determined to need replacement will be dependent upon funds available. |
Violation |
U |
eSMR |
| 1077487 |
06/05/2020 |
DMON |
June 5, 2020 the BOD and TSS sample at INF-001 was collected as a grab sample instead of a composite as required by the permit. The composite sample collected was inadvertently discarded in the laboratory as it was mistaken for a previously analyzed sample. |
Laboratory staff have been instructed to thoroughly inspect samples before discarding |
Violation |
B |
eSMR |
| 1077488 |
06/03/2020 |
Order Conditions |
June 3, 2020 the City experienced a turbidity reading over the 0.5 NTU maximum limitation at location FIL-001. It was found that the alarm to divert flow at 0.18 NTU failed due to a redundancy alarm setting within the system that caused a fault in programming. |
The redundant alarm setting has been removed at this time and this sort of program failure should not occur again. |
Violation |
U |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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