Underground Construction Co Inc
Active WDID 2 48I010805 Benicia, Solano County Region 2 · San Francisco Bay
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Benicia, Solano County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Suisun Bay Carquinez Straight (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
- 2 waterbodies; 2 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 258 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 17, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 0 violation records · 0 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
- 38.08106, -122.11237
- Precision
- 5 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
- 5145 Industrial Way, Benicia 94510
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Suisun Bay Estuaries-Frontal Suisun Bay HUC12 180500010401
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
- Underground Construction Co Inc
- Primary industry (SIC)
- 4212-Local Trucking Without Storage
- Application ID
- 184684
- NOI processed
- Dec 21, 1993
- Last certified
- Jun 29, 2015
- Facility size
- 3 Acres
- Impervious area
- 2 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 184684 | Industrial | Active | Dec 21, 1993 | — | Jun 29, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Suisun Bay Carquinez Straight
- 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 |
|---|---|---|---|
| Suisun Marsh Wetlands CAT2072400019980929145809 | 0 m | listed | 5 |
| Suisun Bay CAB2071002020011017135055 | 837 m | listed | 10 |
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.
258 distinct measurements across 3 parameters, most recent sample Feb 17, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 18 | 3 | 0 | Nov 13, 2025 | Feb 17, 2026 |
| 2024 | 15 | 3 | 0 | Feb 04, 2025 | Feb 13, 2025 |
| 2023 | 27 | 3 | 0 | Dec 18, 2023 | Feb 01, 2024 |
| 2022 | 54 | 3 | 0 | Nov 01, 2022 | May 02, 2023 |
| 2021 | 18 | 3 | 0 | Oct 21, 2021 | Nov 09, 2021 |
| 2020 | 24 | 3 | 0 | Jan 04, 2021 | Feb 11, 2021 |
| 2019 | 18 | 3 | 0 | Dec 02, 2019 | May 13, 2020 |
| 2018 | 18 | 3 | 0 | Nov 29, 2018 | Jan 17, 2019 |
| 2017 | 9 | 3 | 0 | Jan 08, 2018 | Jan 08, 2018 |
| 2016 | 21 | 3 | 0 | Oct 14, 2016 | Feb 06, 2017 |
| 2015 | 36 | 3 | 0 | Dec 03, 2015 | Apr 22, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Total Suspended Solids (TSS) | mg/L | 89 | 0 | Dec 03, 2015 | Feb 17, 2026 | Results |
| pH | SU | 86 | 0 | Dec 03, 2015 | Feb 17, 2026 | Results |
| Oil and Grease | mg/L | 83 | 75 | Dec 03, 2015 | Feb 17, 2026 | Results |
All results (258 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 17, 2026 | Oil and Grease | DNQ 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369930 | |
| Feb 17, 2026 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369930 | |
| Feb 17, 2026 | Oil and Grease | DNQ 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369930 | |
| Feb 17, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1369930 | |
| Feb 17, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1369930 | |
| Feb 17, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1369930 | |
| Feb 17, 2026 | Total Suspended Solids (TSS) | 62 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369930 | |
| Feb 17, 2026 | Total Suspended Solids (TSS) | 72 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369930 | |
| Feb 17, 2026 | Total Suspended Solids (TSS) | 76 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369930 | |
| Nov 13, 2025 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359188 | |
| Nov 13, 2025 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359188 | |
| Nov 13, 2025 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359188 | |
| Nov 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1359188 | |
| Nov 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1359188 | |
| Nov 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1359188 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 140 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359188 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 260 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359188 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 22 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359188 | |
| Feb 13, 2025 | Oil and Grease | DNQ 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324903 | |
| Feb 13, 2025 | Oil and Grease | DNQ 3.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324903 | |
| Feb 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1324903 | |
| Feb 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1324903 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 100 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324903 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 47 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324903 | |
| Feb 04, 2025 | Oil and Grease | 5.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1322657 | |
| Feb 04, 2025 | Oil and Grease | DNQ 3.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1322657 | |
| Feb 04, 2025 | Oil and Grease | DNQ 2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1322657 | |
| Feb 04, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1322657 | |
| Feb 04, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1322657 | |
| Feb 04, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1322657 | |
| Feb 04, 2025 | Total Suspended Solids (TSS) | 160 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1322657 | |
| Feb 04, 2025 | Total Suspended Solids (TSS) | 200 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1322657 | |
| Feb 04, 2025 | Total Suspended Solids (TSS) | 87 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1322657 | |
| Feb 01, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1279546 | |
| Feb 01, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1279546 | |
| Feb 01, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1279546 | |
| Feb 01, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279546 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279546 | |
| Feb 01, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279546 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 73 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279546 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279546 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 86 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279546 | |
| Jan 24, 2024 | Oil and Grease | DNQ 3.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1276909 | |
| Jan 24, 2024 | Oil and Grease | DNQ 4.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1276909 | |
| Jan 24, 2024 | Oil and Grease | DNQ 5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1276909 | |
| Jan 24, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1276909 | |
| Jan 24, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1276909 | |
| Jan 24, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1276909 | |
| Jan 24, 2024 | Total Suspended Solids (TSS) | 71 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1276909 | |
| Jan 24, 2024 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1276909 |
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 | 0 | 0 Violation · 0 Potential (preliminary) · 0 Dismissed | — | Oct 21, 2026 | |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | Sep 14, 2022 – Sep 14, 2022 | 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 (12 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 10, 2026 | Annual reports | 1337528 | Annual report 2025 | — | |
| Jul 10, 2025 | Annual reports | 1296444 | Annual report 2024 | — | |
| Jul 11, 2024 | Annual reports | 1245652 | Annual report 2023 | — | |
| Jun 29, 2023 | Annual reports | 1191771 | Annual report 2022 | — | |
| Sep 14, 2022 | Inspections | 2057606 | B Type compliance | Performed | No Further Action |
| Jul 15, 2022 | Annual reports | 1115364 | Annual report 2021 | — | |
| Jul 07, 2021 | Annual reports | 1063461 | Annual report 2020 | — | |
| Jul 07, 2020 | Annual reports | 980355 | Annual report 2019 | — | |
| Jul 08, 2019 | Annual reports | 956618 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 942045 | Annual report 2017 | — | |
| Jul 12, 2017 | Annual reports | 881458 | Annual report 2016 | — | |
| Jul 12, 2016 | Annual reports | 844504 | Annual report 2015 | — |
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.