020-1 Wyo. Code R. §§ 1-27 - Corrective Action Prioritization Ranking System

(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; and

(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 in Table 2.

TABLE 2

WYOMING DEPARTMENT OF ENVIRONMENTAL QUALITY STORAGE TANK PROGRAM CONTAMINATED SITE EVALUATION WORKSHEET

Facility ID, Site Name ________________________________________________________

Location ___________________________________________________________________

Staff Name _________________________________________________________________

Date ______________________________________________________________________

Score 1-5: Score only one line under each criterion. Total = Score X Weight

CONTAMINANT CRITERIA	SCORE	WEIGHT	TOTAL
Toxicity/Hazard
1 Unrefined petroleum, produced water, dry solids		1
3 Refined petroleum, liquid commercial chemical products		2
5 Explosive materials or hazardous wastes (corrosive, reactive, toxic, flammable		3
Comments (consider volumes)
Concentration - Soil
1 Greater than the soil cleanup levels		1
3 Ten times greater than soil cleanup levels		2
5 Free product (saturated soil or waste material)		3
Comments (consider volumes)
Concentration - Groundwater
1 Greater than MCLs or DWELS		1
3 MCLs/DWELS to 10X MCLs/DWELS or unknown		2
5 Greater than 10X MCLs/DWELS or free product		3
Comments
Hazardous Vapors and Particulates
1 Noticeable odors		1
3 Known vapor emitting volatiles present		2
5 Explosive conditions		3
Comments
ENVIRONMENTAL CRITERIA
Depth to Groundwater
1 Greater than 100 feet		1
3 Less than 100 feet, but greater than 20 feet		2
5 Less than 20 feet		3
Comments
Proximity to Surface Water
1 Greater than 1 mile		1
3 Greater than 1/4 mile, but less than 1 mile		2
5 Features present within 1/4 mile		3
Comments
HUMAN EXPOSURE CRITERIA
Proximity to Drinking Water Source
1 Greater than 1 mile		1
3 Greater than 1/4 mile, but less than 1 mile		2
5 Features present within 1/4 mile		3
Comments
Land Use
1 Open range or vacant and greater than 1 mile to a residence		1
3 Commercial/industrial/recreational use or less than 1 mile to residence		2
5 Residence present or within 1/4 mile		3
Comments
ECOLOGICAL EXPOSURE CRITERIA
Important/Sensitive Habitats or Threatened or Endangered Species
1 I/S habitats OR T/E species greater than 1 mile		1
3 I/S habitats or T/E species greater than 1/4 mile, but less than 1 mile		2
5 I/S habitats or T/E species within 1/4 mile		3
Comments
SITE EVALUTION SUMMARY - TOTAL SCORE

Notes

020-1 Wyo. Code R. §§ 1-27

Adopted, Eff. 6/29/2018.