Data / Mines / California / Sunol Aggregates
Sunol Aggregates: 47 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Sunol Aggregates is an active construction sand and gravel surface mine in Alameda County, California, operated by Mission Valley Rock, LLC with 19 employees on MSHA's record (mine ID 0401859). Since January 1, 2022 MSHA inspectors issued 47 citations and orders there with $27,616 in proposed penalties, and 2 accident reports were filed there, with 1 injury or illness case.
The request: Watch Sunol Aggregates (MSHA mine ID 0401859) in Alameda County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0401859
- Status
- Active since September 24, 1972
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Alameda County, California
- Nearest town
- Sunol
- Operator
- Mission Valley Rock, LLC
- Parent company
- Martin Marietta Materials Inc
- Employees
- 19
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 47
- Significant and substantial
- 2 (4.3%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $27,616
- Amount paid so far
- $27,616
- Inspections
- 28
- Inspector hours on site
- 196
- Citations per inspection
- 1.68 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 1
- Fatalities
- 0
- Latest MSHA record
- October 8, 2026
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 6 | 0 | $2,255 | 1 |
| 2023 | 8 | 0 | $2,019 | 0 |
| 2024 | 14 | 1 | $2,998 | 0 |
| 2025 | 12 | 1 | $19,891 | 0 |
| 2026 | 7 | 0 | $453 | 0 |
Standards cited most at Sunol Aggregates
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14109 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11027 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 2 |
| 30 CFR 62.174 | Occupational noise exposure | 1 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Sunol Aggregates
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| No lost time, or an occupational illness | 1 |
What the accident reports at Sunol Aggregates describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Machinery | 1 |
| Other | 1 |
Equipment named in accident reports at Sunol Aggregates
| Equipment | Reports |
|---|---|
| Hand tools (powered) | 1 |
Other open mines in Alameda County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Eliot Plant | Cemex Construction Materials Pacific, LLC | Alameda County, CA | Construction sand and gravel | 16 | 66 |
| Pleasanton Plant | CalMat Co | Alameda County, CA | Construction sand and gravel | 52 | 25 |
| Sheridan Quarry | Stevens Creek Quarry Inc | Alameda County, CA | Sand, industrial | 3 | 21 |
| DeSilva Gates Aggregates | DeSilva Gates Construction LLC | Alameda County, CA | Construction sand and gravel | 10 | 19 |
| Tidewater Oakland Marine Aggregate | Martin Marietta Northern California Aggregates,LLC | Alameda County, CA | Construction sand and gravel | 6 | 3 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.