UST Tank Installation & Closure Procedures

Question 1

Before installing a new UST system, what must an owner/operator notify the implementing agency at minimum?

Accepted Answer

30 days before installation begins

Answer

60 days before installation begins

Answer

At least 7 days before installation begins

Answer

No advance notice is required

Question 2

Which backfill material is most commonly required around a steel UST tank to prevent corrosion and provide structural support?

Accepted Answer

Pea gravel or crushed stone (3/4 inch or less)

Answer

Native excavated soil

Answer

Sand mixed with clay

Answer

Concrete slurry

Question 3

What is the minimum depth of cover (burial depth) typically required over the top of a UST tank?

Accepted Answer

24 inches

Answer

6 inches

Answer

12 inches

Answer

48 inches

Question 4

When installing a fiberglass-reinforced plastic (FRP) UST, which of the following installation requirements is unique compared to steel tanks?

Accepted Answer

FRP tanks require anchor straps when high groundwater is anticipated

Answer

FRP tanks must be cathodically protected

Answer

FRP tanks must be coated with epoxy before burial

Answer

FRP tanks must be installed above the groundwater table

Question 5

During a UST installation, a vacuum or pressure test is typically conducted to verify what condition?

Accepted Answer

Tank structural integrity and tightness

Answer

Cathodic protection system functionality

Answer

Backfill compaction density

Answer

Piping slope for gravity drainage

Question 6

Which document must be obtained and retained before any UST installation project begins, demonstrating the installer's qualifications?

Accepted Answer

Certification or licensing as required by the implementing agency

Answer

A surety bond from the contractor

Answer

A letter of intent from the equipment manufacturer

Answer

An EPA approval letter for the specific tank model

Question 7

Which of the following piping configurations is required under EPA rules to minimize the risk of product releases from UST piping?

Accepted Answer

Pressurized piping must have an automatic line leak detector and shear valves

Answer

All underground piping must slope upward toward the dispenser

Answer

Underground piping must be installed only in metallic conduit

Answer

All piping joints must be welded; no threaded connections are allowed