Key Takeaway
Superior - Twin Oaks is a active surface mine producing Stone, located in San Marcos, San Diego County, CA. It has 194 violations on record (59 S&S) and $66K in proposed penalties. Operated by Superior Ready Mix Concrete L.P..
Superior - Twin Oaks
Operator: Superior Ready Mix Concrete L.P.
Controller: Vulcan Materials Company
Location: San Marcos, San Diego County, CA
Employees: 7
Recent Violations
View all 194 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 06/25/2025 | 56.14112(a)(1) | Non-S&S | LowNegligence | $151 |
| 06/25/2025 | 56.12032 | Non-S&S | LowNegligence | $151 |
| 06/25/2025 | 56.20011 | S&S | ModNegligence | $465 |
| 06/25/2025 | 56.12018 | Non-S&S | LowNegligence | $151 |
| 06/25/2025 | 56.12032 | Non-S&S | ModNegligence | $151 |
| 01/22/2025 | 56.12018 | Non-S&S | ModNegligence | $642 |
| 11/28/2023 | 56.12004 | Non-S&S | ModNegligence | $143 |
| 11/28/2023 | 56.14107(a) | Non-S&S | HighNegligence | $143 |
| 11/28/2023 | 56.14111(b) | Non-S&S | ModNegligence | $143 |
| 11/28/2023 | 56.20011 | S&S | ModNegligence | $518 |
| 11/28/2023 | 46.7(a) | S&S | ModNegligence | $576 |
| 11/28/2023 | 56.14110 | S&S | ModNegligence | $155 |
| 11/28/2023 | 56.4130(b) | Non-S&S | ModNegligence | $143 |
| 11/28/2023 | 56.14112(a)(1) | Non-S&S | LowNegligence | $143 |
| 11/28/2023 | 56.13015(a) | Non-S&S | ModNegligence | $143 |
| 11/28/2023 | 46.7(a) | S&S | ModNegligence | $576 |
| 06/15/2023 | 56.12032 | Non-S&S | LowNegligence | $143 |
| 06/15/2023 | 56.12004 | Non-S&S | LowNegligence | $143 |
| 03/22/2023 | 56.14112(a)(2) | Non-S&S | LowNegligence | $143 |
| 03/22/2023 | 56.11001 | S&S | ModNegligence | $518 |
Accidents & Injuries
View all 8 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 04/25/2025 | HANDLING OF MATERIALS | DYS AWY FRM WRK & RESTRCTD ACT | 128d lost, 9d restricted |
| 11/21/2024 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 35d lost, 11d restricted |
| 07/01/2022 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 21d lost, 60d restricted |
| 12/30/2021 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | None |
| 08/18/2009 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 88d lost |
| 02/06/2007 | POWERED HAULAGE | DAYS AWAY FROM WORK ONLY | 18d lost |
| 07/20/2006 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 11d lost |
| 05/17/2005 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 2d lost |
Inspections
View all 68 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 03/03/2026 | 0.00 | 0 | |
| 06/24/2025 | 06/26/2025 | 26.00 | 1 |
| 01/21/2025 | 01/23/2025 | 28.50 | 1 |
| 06/10/2024 | 06/11/2024 | 14.50 | 1 |
| 11/29/2023 | 11/29/2023 | 6.00 | 1 |
| 11/27/2023 | 11/29/2023 | 28.50 | 1 |
| 06/14/2023 | 06/20/2023 | 15.00 | 1 |
| 03/21/2023 | 03/22/2023 | 19.75 | 1 |
| 08/08/2022 | 08/10/2022 | 16.25 | 1 |
| 01/04/2022 | 01/05/2022 | 22.75 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Superior - Twin Oaks have?
Superior - Twin Oaks has 194 MSHA violations on record, of which 59 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $66K.
What type of mine is Superior - Twin Oaks?
Superior - Twin Oaks is a Surface mine producing Stone, located in San Marcos, San Diego County, CA. It currently has 7 employees.
Has anyone been injured or killed at Superior - Twin Oaks?
According to MSHA records, Superior - Twin Oaks has 8 reported accident/injury records and 0 fatalities on file.
Who operates Superior - Twin Oaks?
Superior - Twin Oaks is operated by Superior Ready Mix Concrete L.P. and controlled by Vulcan Materials Company. MSHA Mine ID: 0405514.