MAMMOTH UNDERGROUND, LLC
9545 ARVILLE ST, LAS VEGAS, NV 89139 · NAICS 237110 Water and Sewer Line and Related Structures Construction
Having inspection records is common for businesses in regulated industries. Data and methodology
Inspection records
Jul 12, 2011#314892316Jul 12, 2011Referral (C) · Partial scope, Safety#314892316$00 viol.0 violations$0 in penalties
Inspection #314892316
Dates
- Opened
- Jul 12, 2011
- Closing Conference Date
- Jul 20, 2011
- Closed
- Jul 21, 2011
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 15
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- South Buffalo Drive And West Erie Avenue, Las Vegas, NV 89178
- Industry
- 238910 Site Preparation Contractors
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Nov 5, 2008#312281710Nov 5, 2008Planned (H) · Complete scope, Safety#312281710$00 viol.0 violations$0 in penalties
Inspection #312281710
Dates
- Opened
- Nov 5, 2008
- Closing Conference Date
- Dec 8, 2008
- Closed
- Feb 27, 2009
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 7
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 6275 Boulder Highway, Las Vegas, NV 89122
- Industry
- 238910 Site Preparation Contractors
Planned Inspection: This inspection record is categorized as a planned inspection in the DOL OSHA enforcement data. Planned inspections are part of OSHA's scheduled enforcement activity rather than being opened directly from a complaint or reported incident at that worksite.
Oct 2, 2008#312279706Oct 2, 2008Planned (H) · Complete scope, Safety#312279706$02 viol.2 violations$0 in penalties
Inspection #312279706
Dates
- Opened
- Oct 2, 2008
- Closing Conference Date
- Oct 30, 2008
- Closed
- Jan 26, 2009
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 2
Violations and Penalties
- Total Violations
- 2
- Violation Types
- 2 other-than-serious
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 620 Shadow Lane, Las Vegas, NV 89106
- Industry
- 238910 Site Preparation Contractors
Planned Inspection: This inspection record is categorized as a planned inspection in the DOL OSHA enforcement data. Planned inspections are part of OSHA's scheduled enforcement activity rather than being opened directly from a complaint or reported incident at that worksite.
Violations
Violation list (2 of 2 shown)
| Citation | Standard | Type | Instances | Exposed | Initial | Current | Abatement | Contest | Final Order |
|---|---|---|---|---|---|---|---|---|---|
| 02001 | 618037601 | Other | 1 | 2 | $0 | $0 | Nov 4, 2008 | - | - |
| 02002 | 618054202 OSHA citation code: 618054202 A | Other | 1 | 30 | $0 | $0 | Nov 4, 2008 | - | - |
Dec 14, 2007#311635767Dec 14, 2007Referral (C) · Partial scope, Safety#311635767$7003 viol.3 violations$700 in penalties
Inspection #311635767
Dates
- Opened
- Dec 14, 2007
- Closing Conference Date
- Jan 2, 2008
- Closed
- Feb 5, 2008
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 55
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 3
- Violation Types
- 3 serious
- Initial Penalties
- $700
- Penalties on Record
- $700
- Site Address
- Across From 700 Shadow Lane (valley Hospital), Las Vegas, NV 89106
- Industry
- 238910 Site Preparation Contractors
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Violations
Violation list (3 of 3 shown)
| Citation | Standard | Type | Instances | Exposed | Initial | Current | Abatement | Contest | Final Order |
|---|---|---|---|---|---|---|---|---|---|
| 01001A | 1926.651 Excavations - Specific Excavation Requirements OSHA citation code: 19260651 C02 | Serious | 1 | 2 | $700 | $700 | Jan 8, 2008 | - | - |
| 01001B | 1926.651 Excavations - Specific Excavation Requirements OSHA citation code: 19260651 K01 | Serious | 1 | 2 | $0 | $0 | Jan 8, 2008 | - | - |
| 01001C | 1926.652 Excavations - Protection of Employees OSHA citation code: 19260652 A01 | Serious | 1 | 2 | $0 | $0 | Jan 8, 2008 | - | - |
Jan 10, 2007#310428230Jan 10, 2007Referral (C) · No Inspection scope, Safety#310428230$00 viol.0 violations$0 in penalties
Inspection #310428230
Dates
- Opened
- Jan 10, 2007
- Closing Conference Date
- Jan 11, 2007
- Closed
- Jan 11, 2007
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- Not recorded
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- Gilespie/Serene, Las Vegas, NV 89123
- Industry
- 238910 Site Preparation Contractors
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Jun 12, 2006#309941631Jun 12, 2006Planned (H) · Complete scope, Safety#309941631$03 viol.3 violations$0 in penalties
Inspection #309941631
Dates
- Opened
- Jun 12, 2006
- Closing Conference Date
- Jun 29, 2006
- Closed
- Jul 12, 2006
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 3
Violations and Penalties
- Total Violations
- 3
- Violation Types
- 3 other-than-serious
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 9981 Baystone Street, Las Vegas, NV 89141
- Industry
- 238990 All Other Specialty Trade Contractors
Planned Inspection: This inspection record is categorized as a planned inspection in the DOL OSHA enforcement data. Planned inspections are part of OSHA's scheduled enforcement activity rather than being opened directly from a complaint or reported incident at that worksite.
Violations
Violation list (3 of 3 shown)
| Citation | Standard | Type | Instances | Exposed | Initial | Current | Abatement | Contest | Final Order |
|---|---|---|---|---|---|---|---|---|---|
| 01001 | 1904.32 Annual Summary OSHA citation code: 19040032 A01 | Other | 3 | 120 | $0 | $0 | Jul 20, 2006 | - | - |
| 01002 | 1926.501 Fall Protection - Duty to Have Fall Protection OSHA citation code: 19260501 B04 II | Other | 1 | 3 | $0 | $0 | Jul 5, 2006 | - | - |
| 01003 | 1926.651 Excavations - Specific Excavation Requirements OSHA citation code: 19260651 C02 | Other | 1 | 1 | $0 | $0 | Jul 5, 2006 | - | - |
Mar 15, 2005#308693373Mar 15, 2005Referral (C) · Partial scope, Safety#308693373$00 viol.0 violations$0 in penalties
Inspection #308693373
Dates
- Opened
- Mar 15, 2005
- Closing Conference Date
- Mar 23, 2005
- Closed
- Mar 23, 2005
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 70
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- Decatur/Russell Road, Las Vegas, NV 89118
- Industry
- 238910 Site Preparation Contractors
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Penalty amounts may differ from final amounts after settlement or judicial review. How to read these records
About these records
A company page groups inspections with the same normalized employer name, city and state; it is not a legal-entity identifier (how pages are grouped).
This page displays public OSHA enforcement data. Status text follows the DOL inspection record first and may include citation-level context when the inspection feed and citation records are out of sync. Penalty amounts shown reflect the latest penalty amounts on record in the DOL database and may differ from initial assessments or final amounts. This is not an official OSHA resource.
OSHA's public enforcement data does not publish a "guilty" or "not guilty" field for inspections. The closest outcome fields available are the citation counts, penalty amounts, contest dates, final-order dates, and the inspection close date shown on this page. How to interpret these status fields. How initial and current penalties are recorded.
OSHA may publish multiple citation rows in the same inspection with the same standard and penalty fields. Separate rows can still differ in OSHA metadata such as citation identifier, recorded instance count, exposed workers, or gravity value. Contest and Final Order columns show citation-level dates from OSHA's enforcement record. A dash means OSHA's record does not currently show that activity for the citation.
Understanding These Penalties
The maximum penalty for a serious violation in 2025 is $16,550 per violation. For willful violations, the range is $11,823 to $165,514. The current penalty column shows the latest amount on record in OSHA's database for each citation. When the current penalty differs from the initial penalty, OSHA's records show that the amount changed during the enforcement process, but this page does not determine the specific reason for each change. Penalty amounts are set by OSHA and adjusted annually for inflation.
17 inspections, 2005 to 2026. Each row is one inspection; point at or tap a row for its dates and totals.
Source: DOL OSHA enforcement data (inspections and violations), linked via activity_nr (exact government key).
Penalty changes: Amounts shown reflect what OSHA's enforcement record publishes. The reason for any change is not stated unless OSHA's record explicitly says so.
Short cases: When a case closed soon after it opened, the closed marker is drawn slightly to the right so both markers stay visible. Each row's card shows the exact dates.
Standards cited
Industry comparison
Heavy and Civil Engineering Construction, 69,216 employers with OSHA inspections. Arithmetic from DOL records.