Laytonville Rock Quarry
Active WDID 1 23I024035 Laytonville, Mendocino County Region 1 · North Coast
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Laytonville, Mendocino County
- Region 1 · North Coast · Location · Statewide map
- Receiving water
- Tributary to ten mile creek (as reported by the facility)
- Evidence: not confirmed Details
- Identified receiving water on the 2026 303(d) list
- Not established
- Shown only when the reported receiving water is identified and corroborated.
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- 1 waterbody; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 69 distinct results, 9 reporting years (2015 to 2023)
- Most recent sample Mar 01, 2024 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 3 violation records · 4 enforcement actions
- Counts as published in SMARTS; not a compliance determination · Details
Each label shows where a statement comes from. How to read the labels.
Overview and location
Reported facility location HUC12 watershed Corroborated receiving water 2026 Integrated Report waterbodies nearby
Reported location Evidence: facility-reported
- Coordinates
- 39.6932, -123.4751
- Precision
- 4 decimal places
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 1136 Dos Rios Road, Laytonville 95454
- Regional Water Board
- 1 — North Coast
HUC12 watershed Evidence: spatial
- Upper Tenmile Creek HUC12 180101060101
The facility's reported location lies within this HUC12 watershed (spatial derivation); it is not a discharge location.
Permits and applications Evidence: SMARTS record
Current permit record
- Permit type
- Industrial
- Application type
- Notice of Intent (WDID code I)
- Status
- Active
- Operator
- Shawn Studebaker
- Primary industry (SIC)
- 1429-Crushed and Broken Stone, NEC
- Application ID
- 434425
- NOI processed
- Jan 25, 2013
- Last certified
- Jun 23, 2015
- Facility size
- 9 Acres
- Impervious area
- 5 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 434425 | Industrial | Active | Jan 25, 2013 | — | Jun 23, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Tributary to ten mile creek
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: not confirmed Not matchable to a single waterbody
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
Impaired waters and TMDLs
Two kinds of information, kept apart: 2026 Integrated Report waterbodies near the reported location (geographic proximity only), and TMDL records that SMARTS lists for this facility. Neither establishes where the facility discharges; see Receiving water for the facility's own statement.
Nearby waterbodies Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near a waterbody does not mean the facility discharges to it.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Eel River HU, South Fork HA CAR1113103019980710155233 | 317 m | listed | 9 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
No TMDL records for this facility in the SMARTS TMDL export.
Reported monitoring results Evidence: facility-reported
Numeric Action Level (NAL) screening is being independently validated and is not shown. Nothing on this page states whether a result exceeded a NAL.
69 distinct measurements across 3 parameters, most recent sample Mar 01, 2024.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2023 | 3 | 3 | 0 | Mar 01, 2024 | Mar 01, 2024 |
| 2022 | 6 | 3 | 0 | Dec 02, 2022 | Mar 28, 2023 |
| 2021 | 6 | 3 | 0 | Nov 01, 2021 | Apr 20, 2022 |
| 2020 | 6 | 3 | 0 | Dec 16, 2020 | Mar 09, 2021 |
| 2019 | 6 | 3 | 0 | Nov 27, 2019 | Apr 23, 2020 |
| 2018 | 12 | 3 | 0 | Nov 28, 2018 | Mar 20, 2019 |
| 2017 | 12 | 3 | 0 | Nov 13, 2017 | Mar 15, 2018 |
| 2016 | 12 | 3 | 0 | Oct 14, 2016 | Feb 16, 2017 |
| 2015 | 6 | 3 | 0 | Jan 11, 2016 | Mar 03, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 23 | 15 | Jan 11, 2016 | Mar 01, 2024 | Results |
| pH | SU | 23 | 0 | Jan 11, 2016 | Mar 01, 2024 | Results |
| Total Suspended Solids (TSS) | mg/L | 23 | 0 | Jan 11, 2016 | Mar 01, 2024 | Results |
All results (69 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 01, 2024 | Oil and Grease | 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1288747 | |
| Mar 01, 2024 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1288747 | |
| Mar 01, 2024 | Total Suspended Solids (TSS) | 2.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1288747 | |
| Mar 28, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1235790 | |
| Mar 28, 2023 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1235790 | |
| Mar 28, 2023 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1235790 | |
| Dec 02, 2022 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1224594 | |
| Dec 02, 2022 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1224594 | |
| Dec 02, 2022 | Total Suspended Solids (TSS) | 1.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1224594 | |
| Apr 20, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1181868 | |
| Apr 20, 2022 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1181868 | |
| Apr 20, 2022 | Total Suspended Solids (TSS) | 4.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1181868 | |
| Nov 01, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1169344 | |
| Nov 01, 2021 | pH | 7.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1169344 | |
| Nov 01, 2021 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1169344 | |
| Mar 09, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1149443 | |
| Mar 09, 2021 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1149443 | |
| Mar 09, 2021 | Total Suspended Solids (TSS) | 3.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1149443 | |
| Dec 16, 2020 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1138572 | |
| Dec 16, 2020 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1138572 | |
| Dec 16, 2020 | Total Suspended Solids (TSS) | 12 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1138572 | |
| Apr 23, 2020 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1107539 | |
| Apr 23, 2020 | pH | 7.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1107539 | |
| Apr 23, 2020 | Total Suspended Solids (TSS) | 2.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1107539 | |
| Nov 27, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1093795 | |
| Nov 27, 2019 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1093795 | |
| Nov 27, 2019 | Total Suspended Solids (TSS) | 50 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1093795 | |
| Mar 20, 2019 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1057534 | |
| Mar 20, 2019 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1057534 | |
| Mar 20, 2019 | Total Suspended Solids (TSS) | 3.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1057534 | |
| Jan 11, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1057533 | |
| Jan 11, 2019 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1057533 | |
| Jan 11, 2019 | Total Suspended Solids (TSS) | 1.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1057533 | |
| Dec 14, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1057107 | |
| Dec 14, 2018 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1057107 | |
| Dec 14, 2018 | Total Suspended Solids (TSS) | 17 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1057107 | |
| Nov 28, 2018 | Oil and Grease | 4.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1056195 | |
| Nov 28, 2018 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1056195 | |
| Nov 28, 2018 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1056195 | |
| Mar 15, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1001960 | |
| Mar 15, 2018 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1001960 | |
| Mar 15, 2018 | Total Suspended Solids (TSS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1001960 | |
| Jan 18, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1001959 | |
| Jan 18, 2018 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1001959 | |
| Jan 18, 2018 | Total Suspended Solids (TSS) | 5.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1001959 | |
| Dec 20, 2017 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 988814 | |
| Dec 20, 2017 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 988814 | |
| Dec 20, 2017 | Total Suspended Solids (TSS) | 2.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 988814 | |
| Nov 13, 2017 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 988508 | |
| Nov 13, 2017 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 988508 |
Results are shown exactly as reported by the discharger. Identical rows repeated in the State's export are shown once. Where the export contains different versions of the same sample and parameter, each version is listed and flagged. Details.
Compliance and enforcement records Evidence: SMARTS record
These are records as the State Water Board publishes them in SMARTS, with the source's own types and statuses. They are not a compliance determination or rating. A record listed here is not proof of a violation beyond what the source states, and the absence of records does not establish compliance.
| Record type | Records | As published | Dates | Retrieved | List |
|---|---|---|---|---|---|
| Violations | 3 | 3 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 01, 2013 – Jul 15, 2025 | Oct 21, 2026 | All violations |
| Enforcement actions | 4 | 4 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 13, 2013 – Sep 10, 2025 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Jan 24, 2013 – Aug 15, 2019 | Oct 21, 2026 | All inspections |
| Annual reports | 11 | certified reports (contents not shown) | 2015 – 2025 | Oct 21, 2026 | All reports |
| Water-quality-based corrective action reports | 0 | reports, by parameter | — | Oct 21, 2026 |
Each record type is counted by its own SMARTS identifier. A violation and the enforcement action that cites it are two records in two lists; they are never added together.
Chronological record history (20 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 14, 2026 | Annual reports | 1338135 | Annual report 2025 | — | |
| Sep 11, 2025 | Annual reports | 1297113 | Annual report 2024 | — | |
| Sep 10, 2025 | Enforcement actions | 463254 | NOV (Notice of Violation) | Active | |
| Aug 08, 2025 | Enforcement actions | 457387 | NOV (Notice of Violation) | Active | |
| Jul 15, 2025 | Violations | 892858 | Late Report | Violation | Report |
| Jul 11, 2024 | Annual reports | 1246333 | Annual report 2023 | — | |
| Jul 26, 2023 | Annual reports | 1192476 | Annual report 2022 | — | |
| Feb 16, 2023 | Annual reports | 1116163 | Annual report 2021 | — | |
| Feb 09, 2023 | Enforcement actions | 449487 | Verbal Communication | Active | |
| Feb 09, 2023 | Violations | 884557 | Late Report | Violation | Report |
| Jun 17, 2021 | Annual reports | 1064311 | Annual report 2020 | — | |
| Jun 25, 2020 | Annual reports | 981294 | Annual report 2019 | — | |
| Aug 15, 2019 | Inspections | 2044020 | A Type compliance | — | No Further Action |
| Jun 06, 2019 | Annual reports | 957591 | Annual report 2018 | — | |
| Jun 16, 2018 | Annual reports | 943033 | Annual report 2017 | — | |
| Jun 22, 2017 | Annual reports | 882547 | Annual report 2016 | — | |
| Apr 08, 2017 | Annual reports | 844642 | Annual report 2015 | — | |
| Aug 13, 2013 | Enforcement actions | 413667 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 01, 2013 | Violations | 852172 | Late Report | Violation | Report |
| Jan 24, 2013 | Inspections | 2017806 | B Type compliance | — | Follow-up Inspection Needed |
Sources and provenance
| Information | Source | Retrieved or published |
|---|---|---|
| Permit, location, receiving-water text | SMARTS Industrial Application Specific Data | Oct 20, 2026 |
| Permit history | SMARTS Storm Water Applications | Oct 20, 2026 |
| Monitoring results | SMARTS Industrial Parameter Data | Oct 20, 2026 |
| Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12) | USGS | 2026-10-22 |
| 2026 California Integrated Report, Appendix A: 2026 303(d) List (final) | SWRCB | 2026-10-22 |
| Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0) | SWRCB GIS | 2026-10-22 |
| SMARTS TMDL requirements | SMARTS | 2026-10-21 |
Relationships computed 2026-10-22 with methods facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1; proximity threshold 1.0 km.
How to read the evidence labels
- Evidence: SMARTS record Evidence: facility-reported Information as published in SMARTS or reported by the discharger.
- Evidence: identification corroborated The reported receiving-water name identifies one official waterbody and the facility's location is consistent with it. It does not establish a discharge pathway.
- Evidence: candidate, awaiting review Evidence: not confirmed The reported name could match one or more official waterbodies, but no identification has been confirmed; nothing is assigned without review.
- Evidence: spatial Evidence: geographic proximity Derived from the reported location only.
- Evidence: SMARTS-reported Source records whose links to official references are not yet reviewed.
- Evidence: unavailable The information could not be loaded or is not in the sources.
Records are shown as published and are not compliance determinations. How geographic context is derived.