North Carolina Administrative Code
Title 15A - Environmental Quality
Chapter 13 - SOLID WASTE MANAGEMENT
Subchapter C - INACTIVE HAZARDOUS SUBSTANCE OR WASTE DISPOSAL SITES
Section .0200 - PRIORITIZATION SYSTEM
Section 13C .0202 - GROUNDWATER MIGRATION
Current through Register Vol. 38, No. 18, March 15, 2024
(a) The potential for groundwater contamination is based upon route characteristics, waste containment, and waste characteristics. The score for groundwater migration shall be determined by multiplying the score determined for route characteristics in Paragraph (b) by the score determined for waste containment in Paragraph (c) then multiplying that result by the score determined for waste characteristics in Paragraph (d) and dividing that result by 14.82.
(b) A score for route characteristics shall be determined by adding the values assigned in Subparagraphs (b)(1) through (b)(4).
Table 1
Depth |
Assigned Value |
>150 feet |
0 |
> 75 to 150 feet |
2 |
> 20 to 75 feet |
4 |
< 20 feet |
6 |
Contaminant in groundwater |
8 |
Contaminant in drinking supply |
10 |
Table 2
Location |
Assigned Value |
Piedmont and Mountain |
4 |
Coastal Plain |
4 |
Alluvial Valley |
6 |
Table 3
Net Precipitation |
Assigned Value |
< -10 inches |
0 |
> -10 to +5 inches |
1 |
> +5 to +15 inches |
2 |
> +15 inches |
3 |
Table 4
Approximate Range of Hydraulic Conductivity |
Assigned Value |
< 10-7cm/sec |
0 |
>10-7to 10-5cm/sec |
1 |
>10-5to 10-3cm/sec |
2 |
>10-3cm/sec |
3 |
Table 5
Location |
Assigned Value |
Triassic basin |
1 |
Piedmont and Mountain |
2 |
Mountain Alluvial Valley or Coastal Plain |
3 |
Table 6
Physical State |
Assigned Value |
Solid, consolidated and stabilized |
0 |
Solid, unconsolidated or unstabilized |
1 |
Solid, powder or fine particles |
2 |
Liquid, sludge or gas |
3 |
(c) A score for containment shall be determined by using the table entitled "Containment Value for Ground Water Route," contained in 40 CFR 300, Appendix A, July 1, 1988, which is hereby incorporated by reference and does not include subsequent amendments and editions. If the site has more than one type of containment, the containment with the highest value shall be used.
(d) A score for waste characteristics shall be determined by adding the values assigned in Subparagraphs (d)(1) and (d)(2). In determining a waste characteristics score, the substance with the highest combined toxicity/persistence and waste quantity values shall be used.
Table 7
Waste Quantity |
Assigned Value |
None |
0 |
De minimus losses only |
1 |
< 10 pounds |
2 |
> 10 pounds to 100 pounds |
3 |
> 100 pounds to 1000 pounds |
4 |
> 1000 pounds |
5 |
< 10 gallons |
3 |
> 10 gallons to 100 gallons |
4 |
> 100 gallons to 1000 gallons |
5 |
> 1000 gallons |
6 |
> 10 cubic feet |
4 |
> 10 cubic feet to 100 cubic feet |
5 |
> 100 cubic feet to 1000 cubic feet |
6 |
> 1000 cubic feet |
7 |
< 10 drums |
5 |
> 10 drums to 100 drums |
6 |
> 100 drums to 1000 drums |
7 |
> 1000 drums |
8 |
Authority
G.S.
130A-310.2;
130A-310.12;
Eff.
June 1, 1989;
Amended Eff. July 1, 1993; September 1,
1990;
Pursuant to
G.S.
150B-21.3A, rule is necessary without
substantive public interest Eff. June 24,
2017.