Industrial stormwater facility
WDID 1 12I019994 · Notice of Intent · Trinidad, Humboldt
SIC 1429 · Crushed and Broken Stone, NEC · Regional Board 1 - North Coast Region
Hydrologic
Official facility coordinate plotted against the associated Final 2026 Integrated Report impaired-water geometry.
Geometry shown is limited to waterbodies geographically associated with this facility. Geographic association does not establish a discharge connection, receiving-water connectivity, or causation.
Intelligence summary
What is available for this facility across the connected datasets.
Official
303(d) context
Grouped by derived geographic association class.
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) pH, Turbidity
Coastal & Bay Shoreline · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Indicator Bacteria
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Indicator Bacteria
Coastal & Bay Shoreline · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Indicator Bacteria
Wetland, Freshwater · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Mercury
Coastal & Bay Shoreline · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Indicator Bacteria
Associations are calculated from official facility coordinates, USGS HUC12 boundaries, and official 2026 impaired-water geometry. They do not establish a discharge connection or causation.
Water Board-stated TMDL waste load allocations applied to this industrial permit in SMARTS.
No SMARTS TMDL requirement is recorded for this WDID. In the statewide TMDL export only permits in Regions 4, 8 and 9 currently carry industrial TMDL requirements, so an absence here is not a statement that the facility discharges to an unimpaired water.
Official monitoring
Self-reported industrial stormwater sampling results as submitted by the discharger to SMARTS.
Loading reported results…
| Sample date | Location | Parameter | Result | Units | Event |
|---|---|---|---|---|---|
| 2026-04-01 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .12 | mg/L | Qualifying Storm Event |
| 2026-04-01 | SP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | SP-2 | pH | 6.6 | SU | Qualifying Storm Event |
| 2026-04-01 | SP-2 | Total Suspended Solids (TSS) | 44 | mg/L | Qualifying Storm Event |
| 2026-03-05 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .19 | mg/L | Qualifying Storm Event |
| 2026-03-05 | SP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-03-05 | SP-2 | pH | 7.2 | SU | Qualifying Storm Event |
| 2026-03-05 | SP-2 | Total Suspended Solids (TSS) | 21 | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-1 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .46 | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-1 | pH | 8.4 | SU | Qualifying Storm Event |
| 2025-12-26 | SP-1 | Total Suspended Solids (TSS) | 27 | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .62 | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-12-26 | SP-2 | pH | 8.4 | SU | Qualifying Storm Event |
| 2025-12-26 | SP-2 | Total Suspended Solids (TSS) | 73 | mg/L | Qualifying Storm Event |
| 2025-12-15 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .481 | mg/L | Qualifying Storm Event |
| 2025-12-15 | SP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-12-15 | SP-2 | pH | 6.7 | SU | Qualifying Storm Event |
| 2025-12-15 | SP-2 | Total Suspended Solids (TSS) | 25 | mg/L | Qualifying Storm Event |
| 2025-03-12 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-03-12 | SP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-03-12 | SP-2 | pH | 7 | SU | Qualifying Storm Event |
| 2025-03-12 | SP-2 | Total Suspended Solids (TSS) | 70 | mg/L | Qualifying Storm Event |
| 2025-01-31 | SP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | .18 | mg/L | Qualifying Storm Event |
Monitoring rows are official self-reported SMARTS submissions, joined to this facility by WDID. California Stormwater Intelligence does not restate, correct, average or evaluate reported values, and no benchmark comparison or violation determination is made.
YDOS-derived
Reported SMARTS analytical results compared against the Numeric Action Levels of the Industrial General Permit version in effect for each reporting year (July 1 – June 30).
| Parameter | NAL type | Calculated value | NAL | Result | Samples used | Method |
|---|---|---|---|---|---|---|
Nitrite Plus Nitrate (as N) nitrate_nitrite_n | Annual | 0.374 mg/L as N | 0.68 mg/L as N | At or below NALAnnual average of 5 eligible result(s) compared with the annual NAL.0.55× threshold | 5 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Oil and Grease oil_grease | Instantaneous maximum | —0 samples above | 25 mg/L | At or below NALNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 5 eligible5 non-detect as zero | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
pH ph | Instantaneous maximum | —0 samples above | 6 – 9 pH units | Within NAL rangeNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 5 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Total Suspended Solids (TSS) tss | Instantaneous maximum | —0 samples above | 400 mg/L | At or below NALNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 5 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
An NAL exceedance is a permit-defined condition that triggers Exceedance Response Actions under the Industrial General Permit. It is not a violation, an enforcement action, or a Water Board compliance determination. Annual values use the arithmetic average of eligible results with non-detects treated as zero; instantaneous maximum NALs (total suspended solids, oil and grease, pH) are exceeded when two or more eligible results in a reporting year fall outside the level. Rules transcribed from 2014-0057-DWQ as amended by 2015-0122-DWQ ↗ (effective 2015-07-01, superseded 2020-06-30); 2014-0057-DWQ as amended by 2018-0028-DWQ ↗ (effective 2020-07-01).
Documents
Attachment inventory recorded in the State Water Board SMARTS public attachment workflow for this permit.
Metadata indicators
DerivedDocument indicators are YDOS-derived counts and dates calculated from SMARTS attachment metadata. They describe what is on file, not whether a facility complied with any requirement.
88 substantive of 124 indexed attachments
Trinidad Amendment No. 2 Temporary Suspension
Source file type SWPPP · 2020-12-11 · 3.2 MB
Trinidad Amendment No. 2 Temporary Suspension
Source file type SWPPP · 2020-12-11 · 3.2 MB
Trinidad Quarry Site Map
Source file type Facility/Site Map · 2020-12-11 · 3.8 MB
Trinidad Amendment No. 2 Temporary Suspension
Source file type SWPPP · 2020-12-11 · 3.2 MB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-14 · 819 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-04-15 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-04-02 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-02-18 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-01-26 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-07-14 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-05-05 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-03-17 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-01-27 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-01-27 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-07-12 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-07-12 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-07-14 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-07-14 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-06-01 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2022-07-14 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-07-15 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-02-02 · 104 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-07-15 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-05-26 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-04-23 · 104 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-01-16 · 104 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-12-23 · 104 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-07-12 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-05-31 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-05-02 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-01-21 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-01-04 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-07-13 · 911 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-07-10 · 11 KB
Submitted report pdf
Source file type Submitted Report PDF · 2016-07-13 · 911 KB
Submitted report pdf
Source file type Submitted Report PDF · 2016-05-19 · 407 KB
050824 inspection memo
Source file type Final Inspection Report · 2024-05-16 · 2.2 MB
041323 inspection report
Source file type Final Inspection Report · 2023-05-10 · 2.5 MB
Trinidad Sampling Lab Results 4-1-2026
Source file type Laboratory Results · 2026-04-15 · 736 KB
Trinidad Sampling Lab Results 3-5-2026
Source file type Laboratory Results · 2026-04-02 · 746 KB
Trinidad Lab Results 12-26-2025
Source file type Laboratory Results · 2026-02-18 · 325 KB
Trinidad Lab Results 12-15-2025
Source file type Laboratory Results · 2026-01-26 · 586 KB
Trinidad Sampling Lab Results 3-12-25
Source file type Laboratory Results · 2025-04-16 · 597 KB
Trinidad Sampling Lab Results 1-31-25
Source file type Laboratory Results · 2025-03-17 · 657 KB
Trinidad Sampling Visual Observation 12-16-2024
Source file type Laboratory Results · 2025-01-27 · 405 KB
Trinidad Sampling Visual Observation 12-12-2024
Source file type Laboratory Results · 2025-01-23 · 414 KB
Trinidad Sampling Lab Results 6-3-2024
Source file type Laboratory Results · 2024-07-10 · 321 KB
Trinidad Sampling 5-8-2023
Source file type Laboratory Results · 2023-07-13 · 324 KB
Trinidad Sampling 4-17-2023
Source file type Laboratory Results · 2023-05-29 · 359 KB
12-15-2020 Lab Results
Source file type Laboratory Results · 2021-01-27 · 284 KB
Lab Results 4-22-2020
Source file type Laboratory Results · 2020-05-26 · 267 KB
Laboratory Results 3-30-2020
Source file type Laboratory Results · 2020-04-23 · 223 KB
12-19-2019 Laboratory Results
Source file type Laboratory Results · 2020-01-16 · 223 KB
Lab Results 11-26-2019
Source file type Laboratory Results · 2019-12-23 · 226 KB
5-15-2019 Lab Results
Source file type Laboratory Results · 2019-05-31 · 314 KB
Lab Results 4/11/2019
Source file type Laboratory Results · 2019-05-02 · 307 KB
Lab Results
Source file type Laboratory Results · part 1/1 · 2019-01-04 · 346 KB
Lab Results
Source file type Laboratory Results · part 1/1 · 2019-01-04 · 387 KB
MFC Trinidad Stormwater 160226
Source file type Laboratory Results · part 1/1 · 2016-05-19 · 271 KB
MFC Trinidad Stormwater 160128
Source file type Laboratory Results · part 1/1 · 2016-05-19 · 199 KB
MFC Trinidad Stormwater 151217
Source file type Laboratory Results · part 1/1 · 2016-05-19 · 273 KB
MFC Trinidad Stormwater 151124
Source file type Laboratory Results · part 1/1 · 2016-05-19 · 198 KB
MFC Trinidad Storm Water 160226
Source file type Laboratory Results · part 1/1 · 2016-03-11 · 271 KB
MFC Trinidad 160128
Source file type Laboratory Results · part 1/1 · 2016-02-12 · 199 KB
MFC Trinidad Storm Water 151217
Source file type Laboratory Results · part 1/1 · 2016-01-19 · 273 KB
Trinidad Storm Water 151124
Source file type Laboratory Results · part 1/1 · 2015-12-10 · 504 KB
SWPPP Amendment No. 6
Source file type Other · 2025-04-21 · 2.5 MB
Trinidad Sampling Visual Observation 6-3-2024
Source file type Supporting Documentation · 2024-07-10 · 1.1 MB
Trinidad SWPPP Amendment No. 5
Source file type Other · 2024-05-13 · 298 KB
Trinidad SWPPP Amendment No. 4
Source file type Other · 2023-10-30 · 465 KB
Trinidad SWPPP Amendment No. 3_REV1
Source file type Other · 2023-04-13 · 314 KB
Trinidad SWPPP Amendment No. 3
Source file type Supporting Documentation · 2023-03-13 · 182 KB
Sampling Log
Source file type Supporting Documentation · part 1/1 · 2019-01-04 · 315 KB
Sampling Log
Source file type Supporting Documentation · part 1/1 · 2019-01-04 · 409 KB
Trinidad ISWPPP Amendment No.001
Source file type Other · part 1/1 · 2018-05-31 · 3.9 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-06-30 · 3.7 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-06-30 · 1.8 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-06-30 · 3.6 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-06-30 · 2.8 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-02-09 · 3.2 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-02-09 · 2.3 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-02-09 · 2.8 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2016-02-09 · 3.0 MB
141017_DCJ_ef_IGPExceedance_MercerFraserTrinidad.pdf
Source file type Cover/Explanation Letter · part 1/1 · 2014-10-28 · 335 KB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2014-02-25 · 1.9 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2014-02-25 · 2.3 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2014-02-25 · 2.4 MB
Mercer Fraser Trinidad
Source file type Photograph · part 1/1 · 2014-02-25 · 2.4 MB
Enforcement
Enforcement actions as recorded by the State Water Board for this permit, in the source system's own terminology.
Structured enforcement records are not yet connected for this site. The absence of a record is not a finding about this facility.
Reporting
Annual report and Exceedance Response Action information as stated by the source system, distinguished from what is inferred from document metadata.
Annual report documents on file
DerivedYears are YDOS-derived from attachment metadata. A gap means no annual-report document was identified for that year in the attachment index — it is not a finding that a report was not filed.
Recent activity
New or changed source records this platform detected for this permit, newest first.
No source change has been detected for this permit yet. Change detection begins from the date each dataset was first indexed.
Provenance