Industrial stormwater facility
WDID 1 12I028461 · Notice of Intent · Arcata, Humboldt
SIC 5093 · Scrap and Waste Materials · 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 (1) Indicator Bacteria
Bay & Harbor · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (3) Dioxin compounds (including 2,3,7,8-TCDD), Dioxin Toxic Equivalents, PCBs (Polychlorinated biphenyls)
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (1) Indicator Bacteria
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) Indicator Bacteria, Sediment
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (3) Aluminum, Sediment, Sedimentation/Siltation
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) Aluminum, Manganese
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 |
|---|---|---|---|---|---|
| 2026-04-26 | DI-1 | Aluminum | .42 | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Chemical oxygen demand (COD) | 31 | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Iron | .6 | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Lead | .00246 | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | pH | 7.09 | SU | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Total Suspended Solids (TSS) | 11 | mg/L | Qualifying Storm Event |
| 2026-04-26 | DI-1 | Zinc | .022 | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Aluminum | .23 | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Chemical oxygen demand (COD) | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Iron | .24 | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Lead | .00292 | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | pH | 6 | SU | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Total Suspended Solids (TSS) | 5.8 | mg/L | Qualifying Storm Event |
| 2026-04-15 | DI-2 | Zinc | .013 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Aluminum | 3.8 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Chemical oxygen demand (COD) | 61 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Iron | 4.8 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Lead | .0659 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | pH | ND —(non-detect / est.) | SU | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Total Suspended Solids (TSS) | 52 | mg/L | Qualifying Storm Event |
| 2026-02-19 | DI-2 | Zinc | .4 | mg/L | Qualifying Storm Event |
| 2026-01-05 | DI-2 | Aluminum | .19 | 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 |
|---|---|---|---|---|---|---|
Aluminum, Total aluminum_total | Annual | 1.16 mg/L | 0.75 mg/L | Above NALAnnual average of 4 eligible result(s) compared with the annual NAL.1.55× threshold | 4 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) |
Chemical Oxygen Demand (COD) cod | Annual | 37 mg/L | 120 mg/L | At or below NALAnnual average of 4 eligible result(s) compared with the annual NAL.0.31× threshold | 4 eligible1 non-detect as zero | 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) |
Iron, Total iron_total | Annual | 1.478 mg/L | 1 mg/L | Above NALAnnual average of 4 eligible result(s) compared with the annual NAL.1.48× threshold | 4 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) |
Lead, Total lead_total | Annual | 0.018 mg/L | 0.262 mg/L | At or below NALAnnual average of 4 eligible result(s) compared with the annual NAL.0.07× threshold | 4 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. | 4 eligible4 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. | 2 eligible2 excluded | 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. | 4 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Zinc, Total zinc_total | Annual | 0.112 mg/L | 0.26 mg/L | At or below NALAnnual average of 4 eligible result(s) compared with the annual NAL.0.43× threshold | 4 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) |
YDOS-derived overlap
Parameters where this facility has an NAL exceedance in at least one reporting year and the geographically associated waterbody carries a 303(d) listing for the same pollutant.
AluminumMonitoringAbove NAL303(d) impairmentEureka Plain HU, Freshwater Creek
2 reporting years above the annual NAL, most recently RY 2025 · 1 303(d) listing · association: derived watershed association (low confidence)
AluminumMonitoringAbove NAL303(d) impairmentEureka Plain HU, Salmon Creek
2 reporting years above the annual NAL, most recently RY 2025 · 1 303(d) listing · association: derived watershed association (low confidence)
Overlap is informational co-occurrence between a derived NAL comparison and an official 303(d) listing. It is not evidence that this facility caused or contributed to the impairment.
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.
32 substantive of 47 indexed attachments
20210727-ArcataScrapAndSalvageSWPPP-Amend1
Source file type SWPPP · 2022-09-02 · 66.8 MB
Arcata Scrap and Salvage_Site Map Set
Source file type Facility/Site Map · 2021-11-15 · 7.3 MB
Site Map
Source file type Facility/Site Map · part 1/1 · 2019-11-05 · 2.7 MB
Stormwater Pollution Prevention Plan
Source file type SWPPP · part 1/1 · 2019-11-05 · 6.7 MB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-15 · 1.0 MB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-15 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-15 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-15 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-15 · 406 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-08-07 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-07-15 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-06-11 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-04-03 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-11-15 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-04-27 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-07-16 · 1000 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-02-14 · 105 KB
ERA Level 1 Report
Source file type Level 1 Technical Report · part 1/1 · 2021-04-27 · 467 KB
24-25 Annual Report NOV
Source file type Enforcement Document · 2025-11-04 · 123 KB
NOV letter
Source file type Enforcement Document · 2021-01-08 · 2.9 MB
2026_03_02_Arcata Scrap and Salvage_Inspection Report
Source file type Final Inspection Report · part 1/1 · 2026-04-20 · 5.6 MB
092921 inspection report
Source file type Final Inspection Report · 2021-10-15 · 2.6 MB
Inspection report
Source file type Final Inspection Report · 2020-12-30 · 2.4 MB
26E1293_1 alphaMDLSW 05 20 26 0812
Source file type Laboratory Results · part 1/1 · 2026-07-15 · 676 KB
26D3411_1 alphaMDLSW 05 01 26 0650
Source file type Laboratory Results · part 1/1 · 2026-07-15 · 757 KB
030926 Lab Report
Source file type Laboratory Results · part 1/1 · 2026-03-30 · 814 KB
020226 Lab Report
Source file type Laboratory Results · part 1/1 · 2026-02-26 · 749 KB
NCL Analytical Report
Source file type Laboratory Results · part 1/1 · 2020-02-06 · 259 KB
211115_Arcata Scrap and Salvage_Memorandum
Source file type Memo · 2021-11-15 · 7.2 MB
Response to NOV
Source file type Cover/Explanation Letter · part 1/1 · 2021-02-08 · 4.3 MB
12/22/19 Analytical results
Source file type Other · part 1/1 · 2020-01-17 · 259 KB
Inspection report
Source file type Photograph · 2020-01-06 · 4.4 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. 2 enforcement-typed documents are on file in the document inventory above.
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