| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 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 |
OEV |
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 |
U |
eSMR |
| 1116037 |
03/03/2023 |
OEV |
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 |
U |
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 |
| 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 |
U |
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 |
| 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 |
| 1080283 |
04/30/2020 |
Order Conditions |
In the April 2020 eSMR cover letter, the City of Modesto reported that the effluent pH meter was put on hold by mistake from 14 April 2020 to 15 April 2020. Once the Facility¿s operators became aware of the mistake, the effluent pH meter was immediately put back to operation. In order to prevent similar incidents, the Discharger replaced the pH meter with visual alert system to indicate if the meter is on the hold mode |
|
Violation |
B |
Report |
| 1073314 |
03/21/2020 |
Order Conditions |
Turbidity 24-hour Average limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
This was found to be due to improperly set Return Activated Sludge withdrawal rates. The issue was corrected and staff was trained to improve water quality. |
Violation |
B |
eSMR |
| 1073313 |
03/20/2020 |
Order Conditions |
Turbidity 24-hour Average limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
This was found to be due to improperly set Return Activated Sludge withdrawal rates. The issue was corrected and staff was trained to improve water quality. |
Violation |
B |
eSMR |
| 1073315 |
03/19/2020 |
Order Conditions |
Turbidity 24-hour Average limit is 2 NTU and reported value was 3 NTU at EFF-001A. |
This was found to be due to improperly set Return Activated Sludge withdrawal rates. The issue was corrected and staff was trained to improve water quality. |
Violation |
B |
eSMR |
| 1071922 |
02/09/2020 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at UVS-002A. |
In response to these coliform violations the City has now implemented a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. The City held a sampling technique training session for all operators on February 26, 2020. The City has also cleaned the UV channels, UV lamps, and channel flumes to remove any build up that may be occurring in these areas contributing to these high results. The City has added these cleanings to a regularly scheduled preventative maintenance program. |
Violation |
B |
eSMR |
| 1071920 |
02/09/2020 |
OEV |
Total Coliform Other limit is 240 MPN/100 mL and reported value was 1600 MPN/100 mL at UVS-002A. |
In response to these coliform violations the City has now implemented a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. The City held a sampling technique training session for all operators on February 26, 2020. The City has also cleaned the UV channels, UV lamps, and channel flumes to remove any build up that may be occurring in these areas contributing to these high results. The City has added these cleanings to a regularly scheduled preventative maintenance program. |
Violation |
B |
eSMR |
| 1071923 |
02/07/2020 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 23 MPN/100 mL and reported value was 920 MPN/100 mL at UVS-002A. |
In response to these coliform violations the City has now implemented a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. The City held a sampling technique training session for all operators on February 26, 2020. The City has also cleaned the UV channels, UV lamps, and channel flumes to remove any build up that may be occurring in these areas contributing to these high results. The City has added these cleanings to a regularly scheduled preventative maintenance program. |
Violation |
B |
eSMR |
| 1071921 |
02/07/2020 |
OEV |
Total Coliform Other limit is 240 MPN/100 mL and reported value was 920 MPN/100 mL at UVS-002A. |
In response to these coliform violations the City has now implemented a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. The City held a sampling technique training session for all operators on February 26, 2020. The City has also cleaned the UV channels, UV lamps, and channel flumes to remove any build up that may be occurring in these areas contributing to these high results. The City has added these cleanings to a regularly scheduled preventative maintenance program. |
Violation |
B |
eSMR |
| 1070979 |
01/17/2020 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 23 MPN/100 mL and reported value was 33 MPN/100 mL at UVS-002A. |
Discharge to the Delta Mendota Canal was ceased after the results for these total coliform samples were confirmed. The City is working to determine the source of the elevated total coliform results. The City has now made it a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. These results will be provided to the Regional Water Quality Control Board with future eSMR submittals. |
Violation |
B |
eSMR |
| 1070978 |
01/16/2020 |
OEV |
Total Coliform 1-Hour Average (Mean) limit is 23 MPN/100 mL and reported value was 350 MPN/100 mL at UVS-002A. |
Discharge to the Delta Mendota Canal was ceased after the results for these total coliform samples were confirmed. The City is working to determine the source of the elevated total coliform results. The City has now made it a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. These results will be provided to the Regional Water Quality Control Board with future eSMR submittals. |
Violation |
B |
eSMR |
| 1070977 |
01/16/2020 |
OEV |
Total Coliform Other limit is 240 MPN/100 mL and reported value was 350 MPN/100 mL at UVS-002A. |
Discharge to the Delta Mendota Canal was ceased after the results for these total coliform samples were confirmed. The City is working to determine the source of the elevated total coliform results. The City has now made it a policy when total coliform samples yield positive results from the first read back, the sample will be expanded to include testing for fecal coliforms as well. These results will be provided to the Regional Water Quality Control Board with future eSMR submittals. |
Violation |
B |
eSMR |
| 1066031 |
09/16/2019 |
DMON |
The eSMR does not include BOD results at locations INF-001B and EFF-001B for September 16, 2019 due to a QC failure in the laboratory. |
The cause of failure is unknown and this QC failure occurrence is believed to be an anomaly. |
Violation |
B |
eSMR |
| 1064776 |
08/11/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 74.81 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1064777 |
08/06/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 69.50 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1064775 |
08/05/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 68.69 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1064774 |
08/04/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 71.80 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1064773 |
08/03/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 75.63 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1064772 |
08/01/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 76.32 mJ/cm2 at UVS-001A. |
The City has done extensive maintenance to correct a variance in signal from the UV transmitter and has included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2 in the future. |
Violation |
B |
eSMR |
| 1062572 |
07/29/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 78.34 mJ/cm2 at UVS-001A. |
The City has now included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2. |
Violation |
B |
eSMR |
| 1062573 |
07/28/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 79.68 mJ/cm2 at UVS-001A. |
The City has now included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2. |
Violation |
B |
eSMR |
| 1062571 |
07/27/2019 |
Order Conditions |
UV Dose 1-Hour Average (Mean) limit is 80 mJ/cm2 and reported value was 79.81 mJ/cm2 at UVS-001A. |
The City has now included programing language within the SCADA system that will divert flows into bypass mode should the UV dosage readings fall below 90 mJ/cm2. |
Violation |
B |
eSMR |
| 1062578 |
07/26/2019 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
B |
eSMR |
| 1062576 |
07/25/2019 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
B |
eSMR |
| 1062575 |
07/24/2019 |
OEV |
Total Coliform 7-Day Average (Mean) limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
B |
eSMR |
| 1062570 |
07/23/2019 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4.5 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
B |
eSMR |
| 1062579 |
07/22/2019 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
U |
eSMR |
| 1062574 |
07/21/2019 |
OEV |
Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 4 MPN/100 mL at UVS-002A. |
The higher results in total coliform are believed to be due to sampling procedure. The sampling procedure has been updated and reviewed with staff to ensure this issue will not continue in the future. |
Violation |
B |
eSMR |
| 1062577 |
07/01/2019 |
DMON |
The City of Modesto failed to report a result for dissolved oxygen and temperature at location Eff-001B for the week of July 6, 2019. |
Procedures have been reviewed with staff to ensue the mistake does not occur again in the future. |
Violation |
U |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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