020-1 Wyo. Code R. § 1-27
(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:
(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 ¼ mile, but less than 1 mile | 2 | ||
| 5 Features present within ¼ mile | 3 | ||
| Comments | |||
| HUMAN EXPOSURE CRITERIA | |||
| Proximity to Drinking Water Source | |||
| 1 Greater than 1 mile | 1 | ||
| 3 Greater than ¼ mile, but less than 1 mile | 2 | ||
| 5 Features present within ¼ 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 ¼ 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 ¼ mile, but less than 1 mile | 2 | ||
| 5 I/S habitats or T/E species within ¼ mile | 3 | ||
| Comments | |||
| SITE EVALUTION SUMMARY - TOTAL SCORE | |||
020-1 Wyo. Code R. § 1-27
Adopted, Eff. 6/29/2018.