Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
1125295 |
02/12/2024 |
CAT2 |
Chromium (VI) Dissolved Daily Maximum limit is 16 ug/L and reported value was 19 ug/L at EFF-001. |
This is identified as a potential, but not yet determined, exceedance. We are currently investigating the cause of this potential exceedance. |
Violation |
U |
eSMR |
1125960 |
02/12/2024 |
CAT2 |
Chromium (VI) Dissolved Daily Maximum limit is 16 ug/L and reported value was 19 ug/L at EFF-001. |
This is identified as a potential, but not yet determined, exceedance. We are currently investigating the cause. |
Violation |
U |
eSMR |
1118689 |
05/31/2023 |
CAT2 |
Chromium (VI) Dissolved Daily Maximum limit is 16 ug/L and reported value was 28 ug/L at EFF-001. |
Exceedance qualifies as upset due to laboratory inconsistency, and confirmation sampling under effluent limit. Currently investigating alternative laboratories. |
Violation |
B |
eSMR |
1118164 |
05/31/2023 |
CAT2 |
Chromium (VI) Dissolved Monthly Average limit is 16.0 ug/L and reported value was 28.0 ug/L at EFF-001. |
We are currently investigating potential laboratory error. |
Violation |
B |
eSMR |
1115855 |
03/31/2023 |
CAT2 |
Chromium (VI) Dissolved Monthly Average (Mean) limit is 4.9 ug/L and reported value was 39 ug/L at EFF-001. |
Currently investigating causes and future preventative measures. |
Violation |
B |
eSMR |
1115853 |
03/13/2023 |
CAT2 |
Chromium (VI) Dissolved Daily Maximum limit is 4.9 ug/L and reported value was 39.0 ug/L at EFF-001. |
Immediately shut down system upon notification of exceedance. Currently investigating the cause of the exceedance. |
Violation |
B |
eSMR |
1115854 |
01/31/2023 |
CAT2 |
Copper, Total Recoverable Monthly Average (Mean) limit is 6.6 ug/L and reported value was 18 ug/L at EFF-001. |
Currently investigating causes and preventative measures. |
Violation |
B |
eSMR |
1113591 |
01/17/2023 |
CAT2 |
Copper, Total Recoverable Monthly Average (Mean) limit is 6.6 ug/L and reported value was 18 ug/L at EFF-001. |
We are backwashing the sand filters to increase solids capture |
Violation |
B |
eSMR |
1112537 |
12/31/2022 |
CAT2 |
Copper, Total Recoverable Monthly Average (Mean) limit is 6.6 ug/L and reported value was 7.6 ug/L at EFF-001. |
We are backwashing the sand filters to increase solids capture |
Violation |
B |
eSMR |
1110641 |
10/30/2022 |
CAT2 |
Copper, Total Recoverable Monthly Average limit is 6.6 ug/L and reported value was 9.68 ug/L at EFF-001. |
Adjust flocculant dosage, thoroughly clean clarifier and sand filters, etc. to reduce suspended copper. |
Violation |
B |
eSMR |
1109738 |
09/27/2022 |
ATOX |
Acute Toxicity-Fathead Minnow-survival 4-Day Average (Mean) limit is 90 % effluent and reported value was 60 % effluent at EFF-001. *** MMP Exempt Reason:The Discharger has effluent limitation for toxic chemicals. |
GHD is in the process of evaluating the groundwater extraction and treatment system and is obtaining additional samples for toxicity testing. Operations and maintenance records indicate that flocculant dosage was increased by 6% (to 12%) to manage chromium concentrations on September 13, 2022. Following the toxicity failure, the flocculant was decreased back to 6%. Other chemicals, such as the acid and hydroxide to manage pH were not modified and the pH of the effluent was within permit limits, therefore those chemicals were ruled out. Copper, chromium, and total dissolved solids are not higher in samples that failed toxicity tests, suggesting that they are not the cause of toxicity. The cause continues to be under investigation. |
Violation |
B |
eSMR |
1105709 |
05/31/2022 |
CAT2 |
Copper, Total Recoverable Monthly Average limit is 6.6 ug/L and reported value was 9.67 ug/L at EFF-001. |
Steps to investigate the cause of this exceedance and to prevent it in the future are currently in progress. |
Violation |
B |
eSMR |
1104447 |
04/30/2022 |
CAT2 |
Copper, Total Recoverable Monthly Average limit is 6.6 ug/L and reported value was 9.97 ug/L at EFF-001. |
Steps to investigate the cause of this exceedance and
to prevent it in the future are currently in progress. |
Violation |
B |
eSMR |
1103126 |
03/31/2022 |
CAT2 |
Copper, Total Recoverable Monthly Average limit is 6.6 ug/L and reported value was 6.93 ug/L at EFF-001. |
Steps to investigate the cause of this exceedance and to prevent it in the future are currently in progress. |
Violation |
B |
eSMR |
1103430 |
11/30/2021 |
Deficient Reporting |
Hardness and TDS not reported. Discharger reported NODI E in DMR triggering a violation. |
|
Violation |
B |
Report |
1094755 |
08/31/2021 |
CAT2 |
Copper, Total Monthly Average (Mean) limit is 6.6 ug/L and reported value was 29.5 ug/L at EFF-001. |
Steps taken to address this exceedance included replenishing the sand in the multimedia filters and procuring new fabric for the filter press, which are currently in progress. |
Violation |
B |
eSMR |
1094754 |
08/24/2021 |
CAT2 |
Copper, Total Daily Maximum limit is 17 ug/L and reported value was 29.5 ug/L at EFF-001. |
Steps taken to address this exceedance included replenishing the sand in the multimedia filters and procuring new fabric for the filter press, which are currently in progress. |
Violation |
B |
eSMR |
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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