Spills And Overfills Control

Except for systems filled by transfer of no more than 25 gallons at one time, UST systems must use one or more overfill prevention devices. These devices include sensors to detect tank capacity level, automatic flow shutoff valves, and spill catchment basins.

Owners and operators must report spills and overfills to the implementing agency within a reasonable time period.

The standards apply to new UST systems and some existing tanks.

Manway With Tamper-Proof, ■ Water-Resistant Cap

Q) Inner Wall

(3) Tank Bedding

Minimum Thickness-12" (Same Material as Backfill)

@ Backfill Washed Sand or Pea Gravel Compacted in 12" Lifts ^

•To Leak Alarm Leak Detection (2j

A: Minimum Tank Clearance: 12" For Steel Tanks and 18" For FRP Tanks B: Minimum Burial Depth: 24" For Steel Tanks and 36" For FRP Tanks C: Minimum Penetration Into Groundwater: 5'

FIG. 11.19.2 Double wall tank and leak detection system. (Reprinted from New York Department of Environmental Conservation, 1982, Siting manual for storing hazardous substances: a practical guide for local officials. New York, N.Y.)

Observation Well With Tamper-Proof, Water-Resistant Cap

Containment Layer of Natural or Synthetic Material

- Low Permeability Backfill (10 ■ Gravel @ Slotted Screen @

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