15A NCAC 13C .0205 DIRECT CONTACT
(a) A direct contact score shall be determined by adding the score for residential population determined in Paragraph (b), and the score for nearby population determined in Paragraph (c), and dividing the result by 18.
(b) A score for residential population shall be determined by multiplying the value for toxicity assigned in Subparagraph (b)(1) by the value for targets assigned in Subparagraph (b)(2).
(1) A value for toxicity shall be assigned by multiplying by three the value for toxicity as assigned in Rule .0202(d)(1) of this Section.
(2) A value for residential targets shall be assigned by adding the value for high risk population assigned in Subparagraph (b)(2)(A) and the value for total resident population assigned in Subparagraph (b)(2)(B) and the value for sensitive environment assigned in Subparagraph (b)(2)(C), with a maximum value of 100. In order to evaluate residential targets, there must be confirmed contamination within the property boundaries of a residence or school or day‑care center, or within the boundaries of a sensitive environment.
(A) A value for high risk population shall be assigned by multiplying the resident children, age six and under, by eight.
(B) A value for total resident population shall be assigned by multiplying the total resident population by two.
(C) A value for sensitive environments shall be assigned using Table 10.
Sensitive Environment Assigned Value
Critical habitat for federally designated 25
endangered or threatened species
National park 25
Designated federal wilderness area habitat 20
known to be used by federally designated
(or proposed) threatened or endangered species
National preserve 20
National or State wildlife refuge 20
Federal land designated for protection 20
of natural ecosystems
Administration proposed federal wilderness area 20
Habitat known to be used by State‑designated 15
endangered or threatened species
Habitat known to be used by species under review 15
as to its federally designated threatened and
State lands designated for wildlife or 10
(c) A score for nearby population shall be determined by multiplying the value for likelihood of exposure assigned in Subparagraph (c)(1) by the value for toxicity assigned in Subparagraph (c)(2) and multiplying that result by the value for nearby targets assigned in Subparagraph (c)(3). The nearby population consists of individuals who live or go to school within one mile of an area containing contaminated soils or wastes.
(1) A value for likelihood of exposure shall be assigned by using the area of contamination value assigned in Table 11 and the accessibility/frequency of use value assigned in Table 12 to arrive at the value assigned in Table 13.
Total Area of Contamination Assigned Value
No contamination 0
< 1 acre 25
> 1 acre to 5 acres 50
> 5 acres to 10 acres 75
> 10 acres 100
Accessibility/Frequency of Use Assigned Value
Observed contamination on residential property 100
or on property of a park, playground, school,
or other area designated for use by the public.
Observed contamination on land with no continuous 75
barrier to entry, a barrier that has been
breached; or land where there are clear
indications of human activity (i.e., footprints).
Observed contamination on land either protected 50
by a continuous and effective barriers to
entry, or monitored by 24‑hour surveillance.
Observed contamination on land protected by a 25
continuous and effective barrier to entry and
Presence of an artificial barrier and a 5
natural barrier that combine to restrict
access to hazardous substances by completely
surrounding the facility; and a means to control
entry, at all times, through gates or other
entrances to the facility.
(2) A value for toxicity shall be assigned by multiplying by three the value for toxicity as assigned in Rule .0202(d)(1) of this Section.
(3) A value for nearby targets shall be assigned by multiplying the population within 1/2 mile of the site by 0.1, and adding the result of multiplying 0.05 by the population between 1/2 and 1 mile of the site, with a maximum total value of 100.
Area of Accessibility/Frequency of Use Value
Value 100 75 50 25 5
100 1 1 0.75 0.5 0.25
75 1 0.75 0.5 0.25 0.1
50 0.75 0.5 0.25 0.1 0
25 0.5 0.25 0.1 0 0
No Confirmed 0 0 0 0 0
History Note: Authority G.S. 130A-310.2; 130A‑310.12;
Eff. June 1, 1989;
Amended Eff. September 1, 1990;
Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. June 24, 2017.