Client: Safety-Kleen Systems, Inc.
Location: Various locations throughout the U.S.
Project Overview: Trihydro has performed ultrasonic shell thickness assessments of aboveground storage tank systems (AGST) for a solvent distribution, collection, and recycling company in eight states. These tanks contain hazardous waste and are regulated under the solvent recycling company's permit to operate, and other applicable regulations. The assessments are performed to evaluate the condition of the AGST, including a visual inspection of the emissions control devices (as per 40 CFR 264 Subpart CC requirements), pursuant to the facility permit conditions.

The general scope of work for these integrity assessments include: ultrasonic thickness measurements of the tank shell, a visual inspection of the tank and ancillary equipment for evidence of leaks, annual 40 CFR 264 Subpart CC inspection of the tank vents and openings, evaluation of high-level alarm operation, and inspection of equipment connections subject to requirements of 40 CFR 264 Subpart BB.

Client: Cement Company
Location: Albany County, Wyoming
Project Overview: Trihydro was contracted by a cement company to revise the mine permit for a series of limestone quarries located in Albany County, Wyoming. The requested revisions included accounting for an increased area of disturbance and preparing updated mining and reclamation plans. Specific elements of the project included:

• Incorporation of two existing quarry sites into a single mine unit in order to facilitate continuous mining and reclamation sequencing
• Storm water modeling and design of surface water/sediment control structures
• Hydrologic analyses to evaluate pre- and post-mining conditions, catchment areas, discharge rates, and reclaimed channel hydraulic design/morphology
• Update of mine plans to reflect revised areas of disturbance, current overburden stockpiles, topsoil stockpiles, extracted commodity, haul roads, and permit boundaries
• Design of post-mining topography, topsoil/overburden distribution, and revegetation plans
• Development of reclamation bond release criteria based upon comparison area methods
• Regulatory agency meetings and coordination in order to facilitate submittal and approval of permit revisions