Site Risk Assessment Soil Screening Levels
Concentration
mg/kg
Chloride
Arsenic
Barium
Cadmium
Calcium
Chromium
Lead
Magnesium
Sodium
WV
Background
Soil
Concentration
(Range)
mk/kg
NOAA SQuiRTs
Eco-SSL
mg/kg
EPA
Residential
Soil
mg/kg
EPA
Soil to
Groundwater
mg/kg
WV
Soil to
Groundwater
mg/kg
2550
16
203
ND
37100
27.9
23.4
6400
1230
EPA
Drinking Water
MCL
mg/l
250 (secondary)
5.9-13
300-500
400-2500
30-70
10-20
2000-5000
1500-7000
5.7 (mammals)
1.04 (mammals)
0.0022 (mammals)
0.389
15300
70
0.292
82.4
0.376
5.8
1600
7.5
0.01
2
5
0.4 (invertebrates)
0.0537 (mammals)
276
400
180000
13.5
270
100
0.015
Notes:
EPA considers chromium (CAS number 7440-47-3)
as total chromium (Cr VI to Cr III at 1 to 6 ratio).
NOAA SQuiRTs treats the same CAS number as
chromium III only. West Virginia’s Soil to
Groundwater chromium III has a different CAS
number and isn’t, for that reason, on this table.
SSL stands for Soil Screening Level which is not the
same as maximum limit.
Some SQuiRTs concentrations are presented in terms
of percent. 10,000 mk/kg is equal to 1%. So, in the
above table, calcium is 3.7% of sample. SQuiRTs
concentrations are all parts per billion. Divide those
values by 1,000 to get parts per million, mg/kg or
mg/l.
Sources:
Table 2-3: Natural Background Levels of Inorganics
in Soil in West Virginia and Surrounding Areas from
West Virginia Department of Environmental
Protection. 2001. West Virginia Voluntary Remediation
and Redevelopment Act: Guidance Manual Version 2.1.
West Virginia Department of Environmental
Protection, Office of Environmental Remediation.
http://www.wvdep.org/show_blob.cfm?ID=3200&
Name=RemediationGuidanceVersion2-1.pdf.
Background soil ranges are based on 10 samples or
less.
NOAA SQuiRTs -- Buchman, M. F. 2008. NOAA
Screening Quick Reference Tables. Seattle, WA:
Office of Response and Restoration Division,
National Oceanic and Atmospheric Administration,
NOAA OR&R Report 08-1.
http://response.restoration.noaa.gov/book_shelf/12
2_NEW-SQuiRTs.pdf. The table used was Screening
Quick Reference Table for Inorganics in Soil, pages 3
and 4, the Eco-SSL section. These values are more
protective than those published by the EPA.
EPA Residential Soil -- Screening levels provided by
EPA’s Region III online calculator. EPA. Regional
Screening Levels for Chemical Contaminants at
Superfund Sites, online calculator for Risk Assessment
Region III. http://epa-prgs.ornl.gov/cgibin/chemicals/csl_search.
EPA Soil to Groundwater -- Screening levels
provided by EPA’s Region III online calculator and
are MCL based risk levels. EPA. Regional Screening
Levels for Chemical Contaminants at Superfund Sites,
online calculator for Risk Assessment Region III.
http://epa-prgs.ornl.gov/cgibin/chemicals/csl_search.
WV Soil to Groundwater -- Screening levels come
from Table 60-3B in 60CSR3.
http://www.wvdep.org/show_blob.cfm?ID=17897&
Name=deminimis%20table%20from%2060%20CSR%
203%20VRRA%20rule%206-5-09.pdf.
EPA Drinking Water MCL (Maximum
Contamination Limit) -- EPA. 2003. National Primary
Drinking Water Standards. U.S. Environmental
Protection Agency, Office of Water (4606M), EPA
816-F-03-016 (includes National Secondary Drinking
Water Standards).
http://www.epa.gov/safewater/consumer/pdf/mc
l.pdf.
This site risk assessment soil screening levels
table is for the exposed pit waste at a natural gas
well site in Kanawha County, West Virginia.
Two blog posts on our blog at
sootypaws.livejournal.com deal with the site
and material on this table: Risk Assessment,
Parts One and Two. Those links are,
respectively:
http://sootypaws.livejournal.com/16516.html
and
http://sootypaws.livejournal.com/16314.html.
The well completion report for this well as filed
with the state can be seen at:
http://downloads.wvgs.wvnet.edu/BatchInfo/
kanawha/4703905714compO.tif.
Materials related to waste management can be
seen at our website at:
http://members.citynet.net/sootypaws/Woods
/gaswell/comments/waste_index.html.