Compaction Guidelines for Underground Storage Tanks: What You Need to Know

When dealing with the installation of underground storage tanks (USTs), one pivotal aspect you simply can’t overlook is the compaction percentage of the backfill material. You might be wondering—what makes this nuance so crucial? Well, let’s break it down.

First off, the generally recommended compaction percentage for backfilling a UST is 60%. However, many professionals advocate for a higher target of 70% to truly secure the tank's stability and ensure it doesn’t shift or settle over time. You know what they say: you can never be too safe when it comes to underground installations!

Imagine you’ve just set up your tank—it’s shiny, new, and ready for action. But if the backfill isn’t compacted properly, wait, you could face some serious long-term consequences. A compaction percentage of 70% helps minimize those pesky voids in the backfill. This is like trying to build a house on a shaky foundation; it won’t take long before the whole structure feels the consequences!

When the backfill isn’t compacted well, it compromises the structural support for the tank. Trust me, when soil settles, it can lead to major headaches down the road—from structural failings to the heightened risk of leaks, which can result in groundwater contamination. Yikes, right? These are not issues you want to deal with!

Now, choosing to stick with that seemingly safer compaction percentage of 60% might sound tempting. After all, who doesn’t want to keep things simple? But let's think critically here. If you opt for a lower percentage, you’re opening the door to potential soil instability and ultimately jeopardizing the tank's performance and safety.

It's like trying to save a few bucks by skimping on quality materials for your building project; it might look good on paper, but in practice, it's just a matter of time before those savings cost you a fortune. So, toeing the line with whatever compaction level seems less complicated could backfire on you.

Remember, the goal with UST installations isn’t merely getting it in the ground—it's about ensuring it can function safely and effectively over time. Achieving that 70% compaction isn’t just a recommendation; it’s a critical step in safeguarding your investment and protecting the environment. Nobody wants to explain a tank failure to regulatory agencies, nor face the hefty fines that could follow.

In the end, when it comes to underground storage tanks, think of compaction like choosing the right vehicle for a road trip. Sure, you can make do with the economy car, but if you’re serious about comfort and stability on the road, you may want to invest in that sturdy SUV instead. Likewise, selecting the right compaction percentage for your backfill is essential for achieving the peace of mind that only comes with knowing you’ve set everything up correctly.

So take heed, whether you’re a seasoned professional or a newbie entering the world of UST installation. The compaction percentage you choose plays a vital role in the performance and longevity of your tank installation. It’s not just about what’s required; it’s about what’s right for a safe, reliable outcome!