Data / Mines / California / Tidewater Oakland Marine Aggregate
Tidewater Oakland Marine Aggregate: 3 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Tidewater Oakland Marine Aggregate is an active construction sand and gravel surface mine in Alameda County, California, operated by Martin Marietta Northern California Aggregates,LLC with 6 employees on MSHA's record (mine ID 0403002). Since January 1, 2022 MSHA inspectors issued 3 citations and orders there with $431 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Tidewater Oakland Marine Aggregate (MSHA mine ID 0403002) 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
- 0403002
- Status
- Active since April 17, 1972
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Alameda County, California
- Nearest town
- Oakland
- Operator
- Martin Marietta Northern California Aggregates,LLC
- Parent company
- Martin Marietta Materials Inc
- Employees
- 6
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 3
- Significant and substantial
- 0 (0.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $431
- Amount paid so far
- $431
- Inspections
- 13
- Inspector hours on site
- 56
- Citations per inspection
- 0.23 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- October 17, 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 | 1 | 0 | $133 | 0 |
| 2024 | 1 | 0 | $147 | 0 |
| 2025 | 1 | 0 | $151 | 0 |
Standards cited most at Tidewater Oakland Marine Aggregate
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 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.15001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 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 |
| Sunol Aggregates | Mission Valley Rock, LLC | Alameda County, CA | Construction sand and gravel | 19 | 47 |
| 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 |
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.