p-Xylene
Zinc
Zinc phosphide
Zineb
Uranium-235 2
106-42-3
7440-66-6
1314-84-7
12122-67-7
U-235+D
NA
3E+00
3E-03
5E-01
2.59E-04
Uranium-238 2
U-238+D
2.32E-04
Radium-226
2
Ra-226+D
4.42E-05
Radium-228
2
Ra-228+D
1.95E-05
Pb-210+D
6.40E-06
Th-228+D
8.05E-05
Lead-210
2
Thorium-228
2
1
PRGs Based on EPA Models, IEUBK (1994) and TRW
(1996)
2 PRGS are calculated for the Parent and Progeny (Daughters "D") in Activity
concentrations of pCi/mL
Legislative History-Adopted 12/22/03, Resolu. 2004-085; Readopted 8/01/06, Resolu. 2006-524.
APPENDIX B
SPOKANE TRIBAL HAZARDOUS SUBSTANCES CONTROL
Soil cleanup levels.
(a) The following Table indicates the minimum cleanup levels for soil, in terms of amount of
individual hazardous substance per unit mass, for the hazardous substances listed.
(b) These cleanup levels shall remain in effect until the Department of Natural Resources
(“Department”) amends them.
(c) The Department may also establish more stringent cleanup levels for a specific site, when,
based on a site-specific evaluation, the Department determines that such levels are necessary to
protect human health and the environment.
(d) For substances not listed below, refer to the state of Washington’s current publication on ”Model
Toxics Control Act Cleanup Levels and Risk Calculations.”
(e) The following table of criteria has been developed based on acceptable risk and assuming that
the receptor (a human child or adult) receives a reasonable maximal expose (RME) from a single
pathway (in this instance, direct ingestion of soil or sediment at a constant rate of 400 mg/d for
the Child ages 0-6 and 3 liters/day for the adult ages 7-70) of the single hazardous substance,
identified in the table, from the single medium (ground water) and assuming an acceptable
exposure level:
(f) If multiple pathways, multiple media (primary and secondary sources), or multiple hazardous
substances are determined to be present by the Department, then criteria based on cumulative
risk shall be calculated following the procedures described under the definition of "cumulative
risk".
Legislative History-Adopted 12/22/03, Resolu. 2004-085; Readopted 8/01/06, Resolu. 2006-524.
Table B1. Soil/Sediment Cleanup Levels Estimated to be Protective of the Human Health, given the
assumptions described in the text.
Hazardous Substance
Acephate
Acetaldehyde
Acetochlor
Acetone
Acetone cyanohydrin
Acetonitrile
Acetophenone
Acifluorfen
CAS No.
30560-19-1
75-07-0
34256-82-1
67-64-1
75-86-5
75-05-8
98-86-2
50594-66-6
Human Health
(mg/kg)
1.50E+02
9.64E+01
7.50E+02
3.75E+03
3E+01
2.25E+02
3.75E+03
4.88E+02
294
Revised Spokane Law & Order Code, 5/14/2013