Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 17 - STORAGE TANKS
Part E - STORAGE TANK SYSTEMS: RELEASE REPORTING, INVESTIGATION, CONFIRMATION AND RESPONSE
Section 17-27 - Corrective Action Prioritization Ranking System

Universal Citation: WY Code of Rules 17-27

Current through September 21, 2024

(a) Criteria. This ranking system establishes criteria for use by the department in determining priorities for conducting state corrective actions at leaking storage tank sites. The ranking is based upon the following primary factors:

(i) Degree of immediate adverse health exposure and/or safety hazards to people in nearby occupied buildings or to public utilities.

(ii) Water quality protection.

(iii) Potential for contaminant(s) migration.

(iv) Ecological protection.

(b) Scoring. The scoring system provides that the sites with the highest scores shall be of the highest priority in conducting department corrective actions. The following listing and point values compose the department's corrective action prioritization ranking system. Points will be applied to each site, as appropriate, depending upon local circumstances. The total score for each leaking storage tank site is the sum of all applicable categories as follows:

TABLE 3

Corrective Action Scoring

Free product on the surface of either surface or

groundwater

Point Value

Presence of free product unknown, but possible

100

Presence of free product unknown, but probable

225

Free product in any amount, on groundwater

350

Water contaminated by dissolved chemical substances

Point Value

Greater than ten (10) times the MCL for drinking water or the Wyoming DWEL

300

Less than ten (10) times or equal to the MCL for drinking water or the Wyoming DWEL

100

The above two (2) values shall be doubled if measurements were made in wells used for drinking water.

Potential to contaminate groundwater

Point Value

Unknown, but probable Unknown, but possible

175 75

Soil Type

Point Value

High permeability (coarse gravel, silty sands, etc.)

150

Moderate permeability (loamy sands, silty clays, etc.)

75

Low permeability (clays)

25

Soil Contamination

Point Value

Heavily contaminated soils. Fails paint filter test or produces a free product layer when mixed with water and allowed to settle for ten (10) minutes

150

Moderately contaminated soils. Observed greasy feel, strong petroleum odor, black discoloration

80

Slightly contaminated soils. Any visible contamination or weak petroleum odor

40

Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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