Danger Excavation / Trench Sign – Hazardous Atmosphere, No Entry Without Testing, 8x12 Rust-Resistant Aluminum Safety Sign by CGAP Safety

Trenches are not “just holes in the ground.” Depending on location and conditions, an excavation can trap or collect unsafe air fast, especially when airflow is limited, soils are saturated, nearby utilities are present, or gases and vapors can migrate into the cut. The problem is that hazardous air does not announce itself. People step down into an excavation thinking it’s routine, then it becomes an oxygen or vapor event with zero warning.

The CGAP Safety “Danger – Excavation / Trench – Hazardous Atmosphere – No Entry Without Testing” sign is designed to place a clear control point at the excavation: verify atmosphere before entry. The wording is intentionally direct so it works in the field, not just in a binder. It alerts crews, subcontractors, and site visitors that the excavation may contain a hazardous atmosphere and that entry is not permitted until testing has been completed.

This sign is a strong fit for civil construction, utility work, industrial maintenance, municipal crews, and sitework operations where excavations may be exposed to vapors, oxygen-deficient conditions, or other airborne hazards. Mount it at an access point, barricade line, fencing, or near the primary entry area so the message is visible before anyone steps into the trench.

Manufactured in 8 x 12 inches from rust-resistant aluminum, it is built for outdoor placement and repeated jobsite use. It holds up where paper notices, laminated sheets, and thin plastic signs fade, curl, crack, or become unreadable after weather and handling.

Use this sign as part of your excavation safety and hazard-communication process to reinforce pre-entry monitoring and help prevent unplanned, unauthorized entry into potentially unsafe air conditions.

Important: This product is a warning sign only and does not replace required training, a competent-person program, protective systems, safe access/egress, or other excavation controls (including cave-in protection) that may be required for the job. Always follow applicable safety standards, site policies, and equipment instructions for atmospheric monitoring and excavation safety.

CGAP Safety is an American safety manufacturer dedicated to straightforward, durable signage that helps organizations close the gap between written policy and real-world field behavior.

• EXCAVATION / TRENCH DANGER SIGN – “Danger / Excavation – Trench / Hazardous Atmosphere / No Entry Without Testing” communicates a high-consequence condition where unsafe air may be present and entry must be controlled.
• SETS A CLEAR ENTRY REQUIREMENT – Reinforces that workers must verify air quality before entry, supporting gas-monitor use and pre-entry checks for oxygen deficiency or hazardous vapors.
• 8x12 RUST-RESISTANT ALUMINUM – Rigid 8 x 12 inch sign manufactured from rust-resistant aluminum with high-contrast red, black, and white graphics for long-term durability in outdoor and muddy jobsite conditions.
• HIGH-VISIBILITY OSHA-STYLE LAYOUT – Classic red DANGER header and bold block lettering are easy to read at a distance on fencing, barricades, posts, or near excavation access points.
• FOR CIVIL, UTILITY, AND SITEWORK CREWS – Ideal for construction, utility installation and repair, municipal work zones, industrial sites, and any excavation area where atmospheric hazards may develop.
• MADE BY AN AMERICAN SAFETY MANUFACTURER – Produced by CGAP Safety, an American safety manufacturer focused on clear, compliance-minded messaging and durable materials for real-world field environments.