| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1128216 |
04/29/2024 |
CAT1 |
Total Suspended Solids (TSS) Single Sample Maximum limit is 30 mg/L and reported value was 38 mg/L at M-017. |
HSC will continue to monitor TSS; during the month of March, we noticed an increase in TSS due to an unknown issue which prompted HSC to purchase a new type of filter which will be installed. |
Violation |
U |
eSMR |
| 1126789 |
03/20/2024 |
CAT1 |
Total Suspended Solids (TSS) Single Sample Maximum limit is 30 mg/L and reported value was 34 mg/L at M-015A. |
HSC will continue to monitor TSS; during the month of March, we noticed an increase in TSS due to an unknown issue which prompted HSC to purchase a new type of filter which will be installed. |
Violation |
U |
eSMR |
| 1125391 |
02/09/2024 |
CAT1 |
Total Suspended Solids (TSS) Single Sample Maximum limit is 30 mg/L and reported value was 40 mg/L at M-017. |
HSC will continue to monitor TSS; during the month of February, we noticed an increase in TSS due to an unknown issue which prompted HSC looking into different filter options as a possible resolution. |
Violation |
U |
eSMR |
| 1124740 |
01/30/2024 |
CAT1 |
Total Suspended Solids (TSS) 5-Sample Median limit is 30 mg/L and reported value was 33.4 mg/L at M-017. |
HSC will continue to monitor TSS; during the month of January, we noticed an increase in TSS due to an unknown issue. If the issue persists, we will look at additional corrective actions. |
Violation |
U |
eSMR |
| 1116964 |
04/19/2023 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 30 mg/L and reported value was 32 mg/L at M-017. |
Persistent elevated TSS over the last roughly half year is thought to be a result of higher TSS in raw water used for the cooling towers. A bag filter was installed into the discharge line prior to the mixing tank in May 2023. |
Violation |
U |
eSMR |
| 1113925 |
01/03/2023 |
CAT1 |
Total Suspended Solids (TSS) Daily Maximum limit is 100 mg/L and reported value was 120 mg/L at M-017. |
Follow up TSS samples were collected on 5 separate days following receipt of monthly analytical report. All results fell below the daily maximum but failed to result in a monthly average below the permit limitation. A sample collected from raw water used in the cooling tower (from the Eel River) in early February reported 8 mg/L, there is some concern that TSS from the raw water may be elevating our discharge results. |
Violation |
B |
eSMR |
| 1113924 |
01/03/2023 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average (Mean) limit is 30 mg/L and reported value was 49.3 mg/L at M-017. |
HSC will continue to monitor TSS; it is speculated that following high volume rainfall in January 2023, a higher than normal sediment load may have existed in the Eel River, which supplies the raw water used in our cooling towers. If the issue persists we will look at additional corrective action. |
Violation |
B |
eSMR |
| 1093887 |
08/22/2021 |
PRE |
Following plant re-start, daily discharge rate on 8/22/21 at boiler blowdown (M015A) prior to mixing tank was 0.014 MGD, which exceeded the permit daily discharge maximum at that location of 0.011 MGD. However, total discharge to effluent discharge point (M017) was well below allowable limit. |
Startup often has higher than usual discharges; the boiler blowdown (M015A) exceeded the daily discharge limit of 0.011 MGD following restart on 8/22/21. However, it is a pretreatment location and the combined discharge at M017 (pond) on was 0.014 MGD (permit allows 0.048 MGD at M017) because there was no discharge from the cooling towers (M014). |
Violation |
B |
eSMR |
| 1089597 |
03/16/2021 |
CAT1 |
Total Suspended Solids (TSS) Daily Average (Mean) limit is 100 mg/L and reported value was 280 mg/L at M-015A. |
We have requested on the new permit to eliminate midpoint sampling and only sample true effluent sample locations. The true effluent streams for that same day were well within limits (1.0 mg/L for RO discharge (M013), and 11 mg/L for primary discharge to log pond (M017), |
Violation |
B |
eSMR |
| 1089596 |
03/16/2021 |
CAT1 |
Total Suspended Solids (TSS) Monthly Average limit is 30 mg/L and reported value was 280 mg/L at M-015A. |
Sample was abnormally high and atypical; since the effluent stream was well below the limit, it should not be an ongoing problem (water from boiler blowdown is mixed with cooling tower blowdown and adjusted for pH prior to discharge out the mixing tank). The true effluent streams for that same day were well within limits (1.0 mg/L for RO discharge (M013), and 11 mg/L for primary discharge to log pond (M017), |
Violation |
B |
eSMR |
| 1067834 |
10/01/2019 |
OEV |
Flow Daily Discharge limit is 0.037 MGD and reported value was 0.054 MGD at M-014. |
Replacement meters for M-014 and M-015 (which is no longer working) are on order and will be installed ASAP; multiple exceedances were noted throughout October. We have estimated boiler blowdown discharge based on average over last 3 months. If high discharges continue after meters are replaced, we will do a system evaluation to the hope of determining what caused the increase. |
Violation |
U |
eSMR |
|
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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