Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
1140052 |
02/02/2025 |
LREP |
Annual SMR ( MONNPDES ) report for 2024 (2789690) was due on 01-FEB-25 |
|
Violation |
B |
Report |
1140050 |
02/02/2025 |
LREP |
Annual SMR ( TECHRPT ) (Mercury PPP Progress RPT (WDR VI.C.3.a)) report for 2024 (2307645) was due on 01-FEB-25 |
|
Violation |
B |
Report |
1140051 |
02/02/2025 |
LREP |
Quarterly SMR ( MONNPDES ) report for Q4 2024 (2858880) was due on 01-FEB-25 |
|
Violation |
B |
Report |
1139296 |
12/10/2024 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
This event coincided with corrective maintenance required of the primary clarification units-the chain and flight system was overhauled, but with the unit offline-this placed a biological strain on subsequent unit processes until it was ultimately resolved. |
Violation |
B |
eSMR |
1132963 |
08/20/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
Continuing to investigate |
Violation |
B |
eSMR |
1132961 |
08/20/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240.0 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
Continuing to investigate. |
Violation |
B |
eSMR |
1132960 |
08/13/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
Continuing to investigate. |
Violation |
B |
eSMR |
1132962 |
08/13/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240.0 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
Continuing to investigate. |
Violation |
B |
eSMR |
1131520 |
07/16/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1131517 |
07/16/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1131519 |
07/09/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 350 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1131516 |
07/09/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240 MPN/100 mL and reported value was 350.0 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1131518 |
07/02/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1131515 |
07/02/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
Continuing to investigate intermittent coliform presence. |
Violation |
B |
eSMR |
1130030 |
06/25/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 79 MPN/100 mL at EFF-001. |
Routine effluent result returned with a value of 79, which prompted the 7-day median to also be exceeded. |
Violation |
B |
eSMR |
1130032 |
06/18/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
The high result fielded during routine sampling with a value of 1600 also prompted exceedance of the 7-day median. |
Violation |
B |
eSMR |
1130029 |
06/18/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240.0 MPN/100 mL and reported value was 1600.0 MPN/100 mL at EFF-001. |
Total chlorine at time of sampling was 9.35mg/L. Suspect entry of biologically disruptive substance that is persistent in process. |
Violation |
B |
eSMR |
1130031 |
06/04/2024 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 540.0 MPN/100 mL at EFF-001. |
Routine sample also prompted the 7-day median of 23 to be exceeded with a value of 540 MPN/100mL. |
Violation |
B |
eSMR |
1130028 |
06/04/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240.0 MPN/100 mL and reported value was 540.0 MPN/100 mL at EFF-001. |
Process adjustments were made due to suspicion that unusual influent conditions may have introduced something biologically disruptive to the process. |
Violation |
B |
eSMR |
1129062 |
05/28/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 1600 MPN/100 mL at EFF-001. |
Hydrocarbon samples were pulled to confirm possible dump entering the system, following/coinciding with this routine sampling and are attached to this report. |
Violation |
B |
eSMR |
1130582 |
04/30/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 276 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1128237 |
04/30/2024 |
CAT1 |
Ammonia, Total (as N) Monthly Average (Mean) limit is 11.0 mg/L and reported value was 13 mg/L at EFF-001. |
Basin 2 was taken offline, process adjustments were made to correct. Basin entry was conducted to replace diffusers with the intention of prioritizing better air transfer. |
Violation |
B |
eSMR |
1128234 |
04/25/2024 |
OEV |
Total Coliform 7-Day Median limit is 230 MPN/100 mL and reported value was 540 MPN/100 mL at EFF-001. |
Process control/diffuser replacement conducted, corrective maintenance as a result of premature fouling. |
Violation |
B |
eSMR |
1128236 |
04/12/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 33 MPN/100 mL at EFF-001. |
Subsequent sampling/investigation |
Violation |
B |
eSMR |
1130581 |
04/04/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 47.0 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1128235 |
04/02/2024 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 70 MPN/100 mL at EFF-001. |
Subsequent sampling. |
Violation |
B |
eSMR |
1127121 |
03/30/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 70 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1125991 |
03/29/2024 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 70 MPN/100 mL at EFF-001. |
Chlorine dose was appropriate, project management confirmed proper sample procedure in field. Management suspects air leaks/losses through the system are contributing to poor air transfer and increase in turbidity that may be translating into the low coliform accounts for total (all results negative for fecal). Project staff intend on doing basin entry to inspect for premature fouling of membrane diffusers, secure endcaps, and replace any discovered and report findings to the SWRCB. |
Violation |
B |
eSMR |
1127120 |
03/26/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 70 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1127119 |
02/14/2024 |
DMON |
Discharger did not monitor influent flow during 6-14 February (because inclement weather resulted in high flow that caused the flow meter to fail). |
|
Violation |
B |
Report |
1127118 |
01/26/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 33 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1127117 |
01/25/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 191 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1124647 |
01/25/2024 |
OEV |
Total Coliform Not to exceed a specific limit more than once within any 30-day period. limit is 240.0 MPN/100 mL and reported value was 350.0 MPN/100 mL at EFF-001. |
Get clarifier 3 back online to increase contact time in disinfection chamber. |
Violation |
B |
eSMR |
1124648 |
01/23/2024 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 33 MPN/100 mL at EFF-001. |
A subsequent issue was discovered that coincided with the coliform positive events (4-20 mA signal was found to be intermittent, wire corroded-replaced). Clarifier 3 offline-may have resulted in reduced disinfection time through contact chamber during high flow periods. Veolia/Telstar are pulling wire in the month of March to get unit back online. |
Violation |
B |
eSMR |
1123698 |
12/31/2023 |
OEV |
Electrical Conductivity @ 25 Deg. C Annual Average (Mean) limit is 1300 mmhos/cm and reported value was 1305 mmhos/cm at EFF-001. |
Eliminate contributors of conductivity into the collection system. |
Violation |
B |
eSMR |
1119159 |
06/30/2023 |
DMON |
Discharger did not report mercury at EFF-001 at the required frequency (WDRs require 1/quarter, and discharger reported 0/quarter). |
|
Violation |
B |
Report |
1119158 |
05/27/2023 |
DMON |
Discharger did not report temperature at EFF-001 at the required frequency (WDRs require 5/week, and discharger reported 4/week). |
|
Violation |
B |
Report |
1113579 |
02/02/2023 |
LREP |
Discharger did not submit the 2022 Mercury PPP Progress Report on time. The report was due on 2/1/2023, and was not submitted as of 2/22/2023. |
|
Violation |
B |
Report |
1113578 |
12/31/2022 |
DMON |
Discharger did not report effluent yearly average conductivity, yearly mercury mass load, yearly methylmercury mass load; and yearly TDS at SPL-00. In addition, the discharger did not include a cover letter with the 2022 Annual SMR. |
|
Violation |
B |
Report |
1112751 |
12/31/2022 |
OEV |
Electrical Conductivity @ 25 Deg. C Annual Average (Mean) limit is 1300 mmhos/cm and reported value was 1385 mmhos/cm at EFF-001. *** Dismissed:Violation created in error by the discharger. |
The source water needs to be lower in order to meet the discharge limit. |
Violation |
B |
eSMR |
1112517 |
12/21/2022 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 76 MPN/100 mL at EFF-001. |
Investigation continues as to the cause of the violation |
Violation |
B |
eSMR |
1110762 |
10/11/2022 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 79 MPN/100 mL at EFF-001. |
Investigation is on-going. |
Violation |
B |
eSMR |
1110654 |
09/30/2022 |
Deficient Reporting |
Discharger did not report monitoring results for hardness in September. |
|
Violation |
B |
Report |
1110657 |
09/30/2022 |
Deficient Reporting |
Discharger did not report monitoring results in Q3 2022 for the temperature difference between effluent and receiving water. |
|
Violation |
B |
Report |
1110653 |
07/21/2022 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 176 MPN/100 mL at EFF-001. |
|
Violation |
B |
Report |
1107804 |
07/20/2022 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 350 MPN/100 mL at EFF-001. |
Continue to monitor process for adequate free chorine. Chlorine contact basins are cleaned weekly. |
Violation |
B |
eSMR |
1107803 |
07/12/2022 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 5.7 mg/L at EFF-001. |
See other report from same event |
Violation |
B |
eSMR |
1107802 |
07/12/2022 |
CAT2 |
Chlorine, Total Residual 4-Day Average (Mean) limit is 0.011 mg/L and reported value was 0.055 mg/L at EFF-001. |
Telstar responded but was not able to identify any specific fixes. System was restarted and working well since. |
Violation |
B |
eSMR |
1106516 |
06/14/2022 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 85 MPN/100 mL at EFF-001. |
Instructed staff to maintain a higher level of chlorine residual. |
Violation |
B |
eSMR |
1102745 |
02/23/2022 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 350 MPN/100 mL at EFF-001. |
Process improved quickly once aeration was reduced to 0.8-1.0 mg/L. |
Violation |
B |
eSMR |
1102743 |
02/16/2022 |
OEV |
Total Coliform 7-Day Median limit is 23.0 MPN/100 mL and reported value was 46 MPN/100 mL at EFF-001. |
Process improved quickly once aeration was reduced to 0.8-1.0 mg/L. |
Violation |
B |
eSMR |
1099190 |
01/11/2022 |
Order Conditions |
Discharger was not able to provide requested daily bench sheets recording effluent pH results for December 2020 and January 2021. |
|
Violation |
B |
Inspection |
1102232 |
12/31/2021 |
Deficient Reporting |
Discharger did not report receiving water visual observations or the temperature difference between effluent and receiving water during Q4 2021, as required by the WDRs. |
|
Violation |
B |
Report |
1098600 |
11/30/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 66 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1098599 |
11/24/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 66 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1098598 |
11/18/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 81 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1098596 |
11/12/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 865 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1098602 |
11/08/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 105 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1098601 |
11/02/2021 |
OEV |
Total Coliform 7-Day Median limit is 23 MPN/100 mL and reported value was 79 MPN/100 mL at EFF-001. |
Additional process monitoring was conducted as the plant recovered. |
Violation |
B |
eSMR |
1097427 |
10/31/2021 |
CAT1 |
BOD5 @ 20 Deg. C, Percent Removal Monthly Average limit is 85 % and reported value was 84 % at EFF-001. |
Increased process monitoring of effluent BOD, TSS, Ammonia-N, pH, Temperature and Total Coliforms. |
Violation |
B |
eSMR |
1097426 |
10/31/2021 |
CAT1 |
Total Suspended Solids (TSS), Percent Removal Monthly Average limit is 85 % and reported value was 76 % at EFF-001. |
Increased process monitoring of effluent BOD, TSS, Ammonia-N, pH, Temperature and Total Coliforms. |
Violation |
B |
eSMR |
1097425 |
10/23/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Weekly Average limit is 45 mg/L and reported value was 71 mg/L at EFF-001. |
Increased process monitoring of effluent BOD, TSS, Ammonia-N, pH, Temperature and Total Coliforms. |
Violation |
B |
eSMR |
1097424 |
10/23/2021 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average limit is 45.0 mg/L and reported value was 55.0 mg/L at EFF-001. |
Increased process monitoring of effluent BOD, TSS, Ammonia-N, pH, Temperature and Total Coliforms. |
Violation |
B |
eSMR |
1102231 |
09/30/2021 |
Deficient Reporting |
Discharger did not report the temperature difference between effluent and receiving water during Q3 2021 as required by the WDRs. |
|
Violation |
B |
Report |
1102229 |
09/30/2021 |
CAT1 |
Ammonia, Total (as N) Monthly Average limit is 11 mg/L and reported value was 13 mg/L at EFF-001. |
|
Violation |
B |
Report |
1102230 |
09/30/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Monthly Average limit is 30 mg/L and reported value was 50 mg/L at EFF-001. |
|
Violation |
B |
Report |
1102228 |
09/25/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Weekly Average limit is 45 mg/L and reported value was 86 mg/L at EFF-001. |
|
Violation |
B |
Report |
1093035 |
05/28/2021 |
Deficient Reporting |
Discharger was not able to report continuous monitoring data related to influent flow, effluent flow, and chlorine residual during 27-28 May 2021, due to a internet network outage. |
|
Violation |
B |
Report |
1093034 |
04/27/2021 |
Deficient Reporting |
Discharger was not able to report continuous monitoring data related to influent flow, effluent flow, and chlorine residual during 22-27 April 2021, due to a internet network outage. |
|
Violation |
B |
Report |
1086940 |
01/31/2021 |
CAT1 |
BOD5 @ 20 Deg. C, Percent Removal Monthly Average limit is 85 % and reported value was 70 % at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086936 |
01/31/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Monthly Average limit is 30 mg/L and reported value was 51 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086937 |
01/31/2021 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 30 mg/L and reported value was 49 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086941 |
01/31/2021 |
CAT1 |
Total Suspended Solids (TSS), Percent Removal Monthly Average limit is 85 % and reported value was 24 % at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086939 |
01/16/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Weekly Average limit is 45 mg/L and reported value was 81 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086943 |
01/16/2021 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average limit is 45 mg/L and reported value was 94 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086938 |
01/09/2021 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Weekly Average limit is 45 mg/L and reported value was 106 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1086942 |
01/09/2021 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average limit is 45 mg/L and reported value was 95 mg/L at EFF-001. |
Evaluating continuous influent ORP monitoring solutions. |
Violation |
B |
eSMR |
1085220 |
12/31/2020 |
OEV |
Electrical Conductivity @ 25 Deg. C Annual Average (Mean) limit is 1300 umhos/cm and reported value was 1322 umhos/cm at EFF-001. |
City of Rio Vista has a Salinity Reduction Program in place. |
Violation |
B |
eSMR |
1086964 |
12/31/2020 |
CAT1 |
Total Suspended Solids (TSS), Percent Removal Monthly Average limit is 85 % and reported value was 78 % at EFF-001. |
|
Violation |
B |
Report |
1086962 |
12/12/2020 |
CAT1 |
Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) Weekly Average limit is 45 mg/L and reported value was 58 mg/L at EFF-001. |
|
Violation |
B |
Report |
1086963 |
12/12/2020 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average limit is 45 mg/L and reported value was 56 mg/L at EFF-001. |
|
Violation |
B |
Report |
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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