# NICHOLS ROAD PIT

- **MSHA mine ID:** 0405638
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** CHANDLER AGGREGATES INC
- **Controller:** Eric  Werner; Pat  Broyles
- **Public source rows linked:** 970
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Eric  Werner; Pat  Broyles (0126981) → CHANDLER AGGREGATES INC (L13940) → NICHOLS ROAD PIT (0405638)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **David H  Murdock → Pacific Clay Products, Inc.:** 2005-04-16 through 2007-01-14; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.
- **David H  Murdock → Pacific Aggregates Inc:** 2007-01-15 through 2013-12-22; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.
- **Jim  Broyles et al → Chandler Aggregates Inc:** 2013-12-23 through 2017-03-09; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.
- **Pat  Broyles et al → Chandler Aggregates Inc:** 2017-03-10 through current/open; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.
- **Eric  Werner et al → Chandler Aggregates Inc:** 2017-03-10 through current/open; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.
- **David Murdock Living Trust → Pacific Aggregates Inc:** 2025-06-10 through 2013-12-22; derived from co-tenure at mine 0405638; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 14
- Interval anomalies: 1
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 2 since 2021:** Accidents and injuries 8 historical accident/injury rows; 0 coded fatalities and 110 lost days across the published record.
2. **COMPLIANCE — 39 since 2021:** Violations and penalties 146 violation rows across the full record; 38 carry an S&S flag and $48,135 appears in current assessed amounts.
3. **HEALTH — 13 samples:** Occupational health samples 13 personal. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 20K employee hours and 32 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 12 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 4 conference records linked by issuance number.
6. **CONTRACTORS — 2 linked entities:** Contractors Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
7. **INSPECTIONS — 13 since 2021:** Inspections 54 inspection events and 913 published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.4102 — Spillage and leakage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4102
- **30 CFR 56.4601 — Oxygen cylinder storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4601
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101

## Source coverage

- **Accident, Injuries, and Illnesses:** 8 rows; 2007-06-27 through 2026-07-03; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2007-03-26 through 2007-03-26; source ID `msha-addresses`
- **Assessed Violations:** 144 rows; 2007-08-22 through 2026-04-15; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2009-05-21 through 2010-07-19; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2023-09-20 through 2023-09-20; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2007-08-22 through 2007-08-22; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 305 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 79 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 2005-04-16 through 2013-12-23; source ID `msha-controller-operator-history`
- **Inspections:** 54 rows; 2007-08-22 through 2026-04-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 166 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 35 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 13 rows; 2009-03-11 through 2023-08-09; source ID `msha-personal-health-samples`
- **Violations:** 146 rows; 2007-08-22 through 2026-04-15; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/nichols-road-pit-0405638`
- JSON: `/api/v1/mines/nichols-road-pit-0405638`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0405638/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0405638/relationships`
- MCP resource: `mine://0405638/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`