Case Studies




Q. Does STC use a large volume of cutter in their blending process?

A. By comparison, STC uses a very small amount of cutter (10%-15% by volume) to centrifuge processing (1:1 or 2:1 ratio). We do not require virgin product (light cycle oil or diesel), which would increase your overall project costs, but can use inexpensive off-spec product.


Q. Does STC's blending process recover any of the entrained oil in the waste like centrifuging does?

A. STC's blending process does not provide any oil recovery. The BTU-rich oil in your waste is what allows it to be routed to the cement kiln network for energy recovery. The dynamics of oil pricing/recovery also factor into the equation. Centrifuging is a very expensive process; is it worth the extra time and effort to recover oil when prices are depressed?


Q. STC's blending process requires roof access. If my roof has structural issues can your equipment still be utilized?

A. STC can utilize manifolds to minimize stress on the roof or even have our blending units suspended from a crane. If roof access is not possible we can enter the tank through an upper door sheet (above the sludge level) and have our blending units extended into the tank via a boom-mounted forklift.


Q. Does STC work on a 24-hour schedule?

A. STC's blending technology is employed on a 10-12 hour work schedule. This shorter workday does not equate to longer project timeframes. Our blending process averages 6-8 loads per day, which is approximately 250-350K lbs or the equivalent of 9-12 roll offs per day.


Q. Will I be generating greater waste volumes since STC doesn't utilize volume reduction technology?

A. ALL tank-cleaning projects have two phases (STC blending/centrifuging & dig out). During Phase 1, STC will generate more volume compared to centrifuging, but our lower disposal costs at cement kilns and minimal site costs more than make up the difference. During Phase 2, STC will generate less volume, as the waste does not need to be solidified before shipping, which greatly increases waste volume/disposal costs.


Q. What is the difference between cement kilns and RCRA incineration/thermal desorption?

A. See attached spreadsheet.


Q. STC's process eliminates the need for roll offs/vac boxes. How much of a benefit is this?

A.Roll off/vac box usage comes with a very high price tag. When factoring in daily rental, liners, lower payloads and container clean-out costs, your additional expense is estimated to be $.01-.02 per lb. for all of your waste volume.


Q. How does STC's price per pound model compare to the traditional daily rate model?

A. Tank cleaning is one of the hardest services to price estimate and has a long history of massive cost overruns, change orders and over-budget outcomes. The traditional daily rate model exacerbates this problem (if a project takes twice as long to complete, your expenses double). Under STC's price per pound model, you can take control of your project. Project expenses are billed by waste volume in the tank and NOT how long it takes to extract waste from the tank.


Q. What kind of equipment package is required for STC's blending technology?

A. STC requires a very minimal equipment/labor package. Our projects do not require utilities, so boilers, electricity, and water are not required. We do not use chemicals, so polymer and mix tanks are not necessary. Interconnected piping and hosing is eliminated as well as all of the trip-and-fall and spill hazards that accompany overcrowded job sites.

Have a question about your project?

Get in touch with our sales leaders.

Carlos Valdez

Gary Higginbotham

Sr. VP of Business Development