Unitek Environmental is the only Guam based full service Hazardous Waste Environmental and Munitions & Explosives of Concern contractor with over 30 years of experience in the Pacific Basin to provide the maximum range of services to our long standing and our new clients.
























Tank Cleaning

tankphotoTank cleaning services are an integral part of Unitek’s operation.  Tank cleaning services performed by Unitek include land underground and aboveground tanks as well as shipboard tanks aboard US Navy, Military Sealift Command and Commercial vessels.  Unitek has performed tank cleaning activities throughout the Pacific including Guam, Saipan, Rota, Tinian, Kwajalein, Palau, and throughout the Federated States of Micronesia.  Unitek has cleaned over 300 tanks with clients that include the U.S. Navy, U.S. Air Force, U.S. Coast Guard, U.S. Army Corps of Engineers as a well as tank facilities operated by Mobil Oil, Shell Oil, and South Pacific Petroleum and various private sector clients. 

100_2767Beyond our firm’s extensive experience, Unitek owns and operates the region's only USEPA permitted mobile oily water treatment plant for processing and treatment of oily water from fuel storage tanks.  This treatment plant is contained within a 40 foot seavan and consists of a 100 gpm oil water separator, 50 & 10 micron sock filters and activated carbon tank.  The treatment unit can be mobilized to any site within the region thereby significantly reducing costs associated with disposal of fuel impacted water. 

100_2697Additionally, to significantly reduce the volume of waste requiring off-island tank bottom sludge disposal, Unitek also owns and operates the region's only mobile centrifuge for separation of solids and liquids.  Tank liquids and sludge with up to 50% solids are processed through the centrifuge separating liquids for processing through our oily water treatment plant and the solids for containment in 55 gallon drums.  During the cleaning of five aboveground storage tanks at the U.S. Army, Kwajalein Atoll Reagan Test Site, this process was performed reducing the volume of waste requiring off-island disposal from 65,000 gallons to 10,000 gallons resulting in an 85% reduction in volume with a disposal cost savings of $1 million.

Unitek’s extensive in-house equipment inventory enables us to provide the necessary equipment for cleaning aboveground tanks as large as 500,000 bbls with floating roofs to underground storage tanks.  Our tank cleaning equipment inventory is the largest in the region including: Vacuum Trucks, Confined Space Entry Retrieval Systems, Intrinsically Safe Confined Space Ventilation Devices, Intrinsically Safe Lighting, Intrinsically Safe 2-Way Radios and Cellular Phones, Floating Roof Support Jacks and Anti-Rotation Devices, Confined Space Entry Meters, High Pressure Water Removal Systems, Interior Scaffolding, Pumps, Hoses, etc.

With our extensive tank cleaning experience, Unitek has established a variety of submittals for this type of work that have been approved by the most demanding clients including U.S. EPA and U.S. Military including: Site Work Plans, Site Safety & Health Plans/AHA’s, Environmental Protection Plans, Floating Roof Support and Bracing Plans, Sampling and Analyses Plans, and Waste Handling and Disposal Plans. 

All Unitek field personnel have undergone training to meet or exceed the requirements for tank cleaning.  This training includes: 40-hour HAZWOPER training, initial HAZWOPER 24-hour training, 8-hour HAZWOPER annual refresher, and 8-hour HAZWOPER supervisor; OSHA 30 Hour Safety, 40 & 8 Hour EM385 Safety Training; 8-hour Confined Space Entry, 24-hour Permit Required Competent Person Confined Space Entry, Confined Space Rescue Training; Forklift, DOT Hazmat, Anti-terrorism, Lead Worker, as well as Construction Quality Management.  All Unitek field personnel participate in a medical surveillance program as required per 29 CFR 1910.120 (f). 

Recent significant tank cleaning projects include:




Project Description



Commonwealth Utilities Corporation

Saipan, CNMI

Clean 5 Aboveground Fuel Storage Tanks at CUC Power Plant 1&2



Shaw Environmental

Kwajalein Atoll, Marshall Islands

Clean 16 Aboveground Fuel Storage Tanks, U.S. Army, Kwajalein Atoll Reagan Test Site



Shaw Environmental

U.S. Navy Base Guam

Clean 13 Aboveground Fuel Storage Tanks, U.S. Navy Sasa Valley Fuel Farm, Naval Base Guam



Mobil Oil

Guam, Saipan, Rota, Tinian

Clean 21 Aboveground Fuel Storage Tanks, Mobil Oil Bulk Fuel Storage Tanks Guam and CNMI



TriStar Terminals


Clean 1-500,000 bbl Aboveground Fuel Storage Tank, Dewater 3-500,000 bbl fuel storage tanks



Kwajalein Range Services


Clean 5 Aboveground Fuel Storage Tanks, Process 65,000 gallons sludge, dispose 10,000gl