Tanks- Material of construction, Design of tank (SW, DW, ETC.), Age of tanks, how many tanks
Cathodic Protection on system
Pumping system (Suction vs pressurized)
The capacity of tank(s)- bigger = more risk
Spill bucket design- SW vs DW
Release detection in use for piping-
Release detection in use for tanks
Number of dispensers- more dispensers=more piping and piping connections
Years since last inspection-
Does site have prior NOV's? Could be indicative of a site that is not being managed or monitored effectively.
Does STP have watertight containment?
Do dispensers have watertight containment under them?
Product stored-This might make the farm industry mad, but I had E85 scored highest, diesel lowest.
Tank status- TOC, permanently closed, open
When we built the original program we used ESRI software and included geographic and demographic criteria like distance to water sources (Surface water, wells), distance to residential buildings, distance to sensitive receptors (Schools, nursing homes, etc.)
Below are some examples of scoring for systems.
- Tanks Score
TW Clad/coated/jacketed Steel 1
TW Fiberglass 1
DW Clad Steel 2
DW Fiberglass 2
DW Steel W/ CP 3
SW Clad Steel 4
SW Fiberglass 4
SW Steel w/Internal lining and/or CP 5
SW Steel 5
- Cathodic Protection Score
None required 1
Impressed Current 5
- Overfill Protection Score
Any combination of below 1
Flapper Valve 2
Ball Float 4
- Tank Capacity Score
0-1100 Gallons 0
1,100-6,000 Gallons 1
6.001 - 10,000 Gallons 2
Greater than 20,001 gallons 5