On August 2, 2007, a Notice of Violation was issued for a Severity Level III violation of 10 CFR 30.34(i). The violation involved the failure to maintain a minimum of two independent physical controls that formed a tangible barrier to secure a portable gauge from unauthorized removal during a period when the gauge was not under direct control or surveillance. Specifically, a Troxler portable gauge was found unattended on top of a two foot wall, adjacent to a new road construction project. The authorized user was out of the direct line of sight to the gauge, leaving the gauge unattended for approximately ten minutes.