Carrierintel
DM

DIAMOND MATERIALS LLC

Carrierintel Safety Score: 76/100. 40 inspection violations in 12 months. Last inspected Sep 2026.

DOT 45597MC 76472ActiveMotor CarrierInterstateArch Insurance CompanyWILMINGTON, DE

COMPANY

Authority since
2012-02-15
MCS-150
2025-07-02 · 676,737 mi (2025)
Fleet
139 units · 35 trailers · 117 drivers
Annual mileage (VMT)
676,737 mi (2025)

ADDRESS

Physical
924 S HEALD ST
WILMINGTON, DE 19801
Mailing
242 N JAMES ST SUITE 102
NEWPORT, DE 19804

CONTACT

Phone
3026586524
Email
diamondmaterials@diamondmaterials.com

OFFICERS

Primary Officer
RICHARD E. PIERSON, JR
Title
PRESIDENT

OPERATION & CARGO

Operation classification
Private Property · Authorized For Hire
Specialty
Tanker / Bulk Liquids
Cargo types
8
Logs, Poles, Beams, LumberBuilding MaterialsMachinery, Large ObjectsLiquids / GasesGarbage, Refuse, TrashChemicalsCommodities Dry BulkConstruction
Self-reported by the company on its latest MCS-150 filing (FMCSA census). Reflects what the carrier is authorized and equipped to haul, not actual recent loads. Specialty is our summary of the declared cargo mix.
AUTHORITY
533 mo
Active authority
INSURANCE
1 active
Arch Insurance Company
RISK GRADE
Minimal Risk
1 risk factors · 4 strengths
OOS RATE
9.3%
18 / 194 inspections

Carrierintel Safety Score

Rolling 12-month heuristic based on inspections, OOS, violations, crashes & fatalities. Not the official FMCSA SMS score.

76
out of 100
Good
Markers: OOS inspection Crash Fatality

Fleet vs Reality

last 12 months · power-unit VINs from roadside inspections
Declared (MCS-150)
139 power units
Unique power units seen
50
+ 11 trailer VINs
Inspections
68
Discrepancy
0.4x

Minimal Risk

1 risk factor · 4 strengths · 5 data points

SAFETY PERFORMANCE

Crash Record
46 crashes · 0 fatal · 17 with injuries · 43 tow-away
Clean Inspection Rate
91% — 176 clean of 194 inspections
Out-of-Service Rate
9.3% — driver OOS 4 insp., vehicle OOS 14 insp.

COMPLIANCE & AUTHORITY

USDOT Registration
Status: Active
Operating Authority
Active: Motor Carrier
Out-of-service orders
None on record
Authority Events
8 historical event(s) on file
MCS-150 Filing
Last filed 2025-07-02

INSURANCE

Active Coverage
1 policy(ies) on file · total max coverage $1,000,000

SUMMARY

5 injury crashes in the last 24 months
Low crash rate (3.2 per 100 trucks/yr)
91% clean inspections
Active insurance on file
Coverage $1.0M

INDUSTRY REPORTS

  • ELD Tampering — Carriers cited for ELD tampering under 49 CFR § 395.8(e), by carrier and state.
  • Top Violations — The ten most-cited FMCSA violation codes of the last 30 days.
  • Phantom Fleets — Declared power units against the vehicles seen at roadside inspections.
  • English Proficiency — Carriers whose drivers were cited under 49 CFR § 391.11(b)(2), by carrier and state.
  • Methodology — Where the data comes from and how the Safety Score and Risk Grade are built.

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