Michigan Administrative Code › Department - Environmental Quality › Remediation and Redevelopment Division › Environmental Contamination Response Activity › CLEANUP CRITERIA REQUIREMENTS FOR RESPONSE ACTIVITY › Section R. 299.49 - Footnotes for generic cleanup criteria tables

Current through Vol. 24-12, July 15, 2024
Rule 49.
(1) The
				  footnotes that apply to the generic criteria tables in
				  R
				  299.44,
				  R 299.46, and
				  R 299.48 are as follows:
(A) Criterion is the state of Michigan
				  drinking water standard established pursuant to Section 5 of 1976 PA 399, MCL
				  325.1005.
(B) Background, as defined in
				  R
				  299.1(b), may be substituted if
				  higher than the calculated cleanup criterion. Background levels may be less
				  than criteria for some inorganic compounds.
(C) The criterion developed under
				  R 299.20 to
				  R 299.26 exceeds the chemical-specific
				  soil saturation screening level (Csat). The person proposing or implementing
				  response activity shall document whether additional response activity is
				  required to control free-phase liquids or NAPL to protect against risks
				  associated with free-phase liquids by using methods appropriate for the
				  free-phase liquids present. Development of a site-specific Csat or methods
				  presented in
				  R 299.22,
				  R 299.24(5), and
				  R 299.26(8) may be
				  conducted for the relevant exposure pathways.
(D) Calculated criterion exceeds 100 percent,
				  hence it is reduced to 100 percent or 1.0E+9 parts per billion (ppb).
(E) Criterion is the aesthetic drinking water
				  value, as required by Section 20120a(5) of the Natural Resources and
				  Environmental Protection Act, 1994 PA 451, MCL
				  324.20120a(5),
				  as amended (NREPA). A notice of aesthetic impact may be employed as an
				  institutional control mechanism if groundwater concentrations exceed the
				  aesthetic drinking water criterion, but do not exceed the applicable
				  health-based drinking water value provided in the following table:
Hazardous Substance
Chemical Abstract Service Number
Residential Health-Based Drinking Water
								  Value
Non-Residential Health-Based Drinking Water
								  Value
Aluminum
7429905
300
4,100
tertiary Amyl methyl ether
994058
910
2,600
Copper
7440508
1,400
4,000
Diethyl ether
60297
3,700
10,000
Ethylbenzene
100414
700
700
Iron
7439896
2,000
5,600
Manganese
7439965
860
2,500
Methyl-tert-butyl ether (MTBE)
1634044
240
690
Toluene
108883
1,000
1,000
1,2,4-Trimethylbenzene
95636
1,000
2,900
1,3,5-Trimethylbenzene
108678
1,000
2,900
Xylenes
1330207
10,000
10,000
(F) Criterion is based on adverse impacts to
				  plant life and phytotoxicity.
(G)
				  Groundwater surface water interface (GSI) criterion depends on the pH or water
				  hardness, or both, of the receiving surface water. The final chronic value
				  (FCV) for the protection of aquatic life shall be calculated based on the pH or
				  hardness of the receiving surface water. Where water hardness exceeds 400 mg
				  CaCO3/L, use 400 mg CaCO3/L for
				  the FCV calculation. The FCV formula provides values in units of ug/L or ppb.
				  The generic GSI criterion is the lesser of the calculated FCV, the wildlife
				  value (WV), and the surface water human non-drinking water value (HNDV). The
				  soil GSI protection criteria for these hazardous substances are the greater of
				  the 20 times the GSI criterion or the GSI soil-water partition values using the
				  GSI criteria developed with the procedure described in this footnote.
Hazardous Substance
FCV Formula ug/L
FCV Conversion Factor (CF)
WV ug/L
HNDV ug/L
Acetate
EXP(0.2732*(pH) + 7.0362)
NA
NA
1.3E+6
Acetic Acid
EXP(0.2732*(pH) + 7.0362)
NA
NA
1.3E+6
Barium
EXP(1.0629*(LnH)+1.1869)
NA
NA
1.6E+5
Beryllium
EXP(2.5279*(LnH)-10.7689)
NA
NA
1,200
Cadmium [OTIMES]
(EXP(0.7852*(LnH)-2.715))*CF
1.101672-((LnH)*(0.041838))
NA
130
Chromium (III) [OTIMES]
(EXP(0.819*(LnH)+0.6848))*CF
0.86
NA
9,400
Copper
(EXP(0.8545*(LnH)-1.702)) *CF
0.96
NA
38,000
Lead [OTIMES]
(EXP(0.9859*(LnH)-1.270))*CF
1.46203-((LnH)*(0.14571))
NA
190
Manganese [OTIMES]
EXP(0.8784*(LnH)+3.5385)
NA
NA
59,000
Nickel
(EXP(0.846*(LnH)+0.0584))*CF
0.997
NA
2.1E+5
Pentachlorophenol [OTIMES]
EXP(1.005*(pH)-5.134)
NA
NA
2.8
Zinc
(EXP(0.8473*(LnH)+0.884))*CF
0.986
NA
16,000
where,
EXP(x) = The base of the natural logarithm raised to power
					 x (ex).
LnH = The natural logarithm of water hardness in mg
					 CaCO3/L.
* = The multiplication symbol.
[OTIMES] = The GSI criterion developed here may not be
					 protective for surface water that is used as a drinking water source. Refer to
					 footnote (X) for further guidance.
A spreadsheet that may be used to calculate GSI and GSI
					 protection criteria for (G)-footnoted hazardous substances is available on the
					 Department of Environmental Quality (DEQ) internet web site.
(H) Valence-specific chromium data (Cr III
				  and Cr VI) shall be compared to the corresponding valence-specific cleanup
				  criteria. If both Cr III and Cr VI are present in groundwater, the total
				  concentration of both cannot exceed the drinking water criterion of 100 ug/L.
				  If analytical data are provided for total chromium only, they shall be compared
				  to the cleanup criteria for Cr VI. Cr III soil cleanup criterion for protection
				  of drinking water can only be used at sites where groundwater is prevented from
				  being used as a public water supply, currently and in the future, through an
				  approved land or resource use restriction.
(I) Hazardous substance may exhibit the
				  characteristic of ignitability as defined in 40 C.F.R. § 261.21 (revised
				  as of July 1, 2001), which is adopted by reference in these rules and is
				  available for inspection at the DEQ, 525 West Allegan Street, Lansing,
				  Michigan. Copies of the regulation may be purchased, at a cost as of the time
				  of adoption of these rules of $45, from the Superintendent of Documents,
				  Government Printing Office, Washington, DC 20401 (stock number
				  869-044-00155-1), or from the DEQ, Remediation and Redevelopment Division
				  (RRD), 525 West Allegan Street, Lansing, Michigan 48933, at cost.
(J) Hazardous substance may be present in
				  several isomer forms. Isomer-specific concentrations shall be added together
				  for comparison to criteria.
(K)
				  Hazardous substance may be flammable or explosive, or both.
(L) Criteria for lead are derived using a
				  biologically based model, as allowed for under Sections 20120a(9) of the NREPA,
				  and are not calculated using the algorithms and assumptions specified in
				  pathway-specific rules. The generic residential drinking water criterion of 4
				  ug/L is linked to the generic residential soil direct contact criterion of 400
				  mg/kg. A higher concentration in the drinking water, up to the state action
				  level of 15 ug/L, may be allowed as a site-specific remedy and still allow for
				  drinking water use, under Section 20120a(2) and 20120b of the NREPA if soil
				  concentrations are appropriately lower than 400 mg/kg. If a site-specific
				  criterion is approved based on this subdivision, a notice shall be filed on the
				  deed for all property where the groundwater concentrations will exceed 4 ug/L
				  to provide notice of the potential for unacceptable risk if soil or groundwater
				  concentrations increase. Acceptable combinations of site-specific soil and
				  drinking water concentrations are presented in the following table:
Acceptable Combinations of Lead in Drinking Water and
					 Soil
Drinking Water Concentration (ug/L)
Soil Concentration (mg/kg)
5
386-395
6
376-385
7
376-385
8
366-375
9
356-365
10
346-355
11
336-345
12
336-345
13
326-335
14
316-325
15
306-315
(M) Calculated criterion is below the
				  analytical target detection limit, therefore, the criterion defaults to the
				  target detection limit.
(N) The
				  concentrations of all potential sources of nitrate-nitrogen (e.g., ammonia-N,
				  nitrite-N, nitrate-N) in groundwater that is used as a source of drinking water
				  shall not, when added together, exceed the nitrate drinking water criterion of
				  10,000 ug/L. Where leaching to groundwater is a relevant pathway, soil
				  concentrations of all potential sources of nitrate-nitrogen shall not, when
				  added together, exceed the nitrate drinking water protection criterion of
				  2.0E+5 ug/kg.
(O) The concentration
				  of all polychlorinated and polybrominated dibenzodioxin and dibenzofuran
				  isomers present at a facility, expressed as an equivalent concentration of
				  2,3,7,8-tetrachlorodibenzo-p-dioxin based upon their relative potency, shall be
				  added together and compared to the criteria for
				  2,3,7,8-tetrachlorodibenzo-p-dioxin. The generic cleanup criteria for
				  2,3,7,8-tetrachlorodibenzo-p-dioxin are not calculated according to the
				  algorithms presented in
				  R 299.14 to
				  R 299.26. The generic cleanup criteria
				  are being held at the values that the DEQ has used since August 1998, in
				  recognition of the fact that national efforts to reassess risks posed by dioxin
				  are not yet complete. Until these studies are complete, it is premature to
				  select a revised slope factor and/or reference dose for calculation of generic
				  cleanup criteria.
(P) Amenable
				  cyanide methods or method OIA-1677 shall be used to quantify cyanide
				  concentrations for compliance with all groundwater criteria. Total cyanide
				  methods or method OIA-1677 shall be used to quantify cyanide concentrations for
				  compliance with soil criteria. Nonresidential direct contact criteria may not
				  be protective of the potential for release of hydrogen cyanide gas. Additional
				  land or resource use restrictions may be necessary to protect for the acute
				  inhalation concerns associated with hydrogen cyanide gas.
(Q) Criteria for carcinogenic polycyclic
				  aromatic hydrocarbons were developed using relative potential potencies to
				  benzo(a)pyrene.
(R) Hazardous
				  substance may exhibit the characteristic of reactivity as defined in 40 C.F.R.
				  § 261.23 (revised as of July 1, 2001), which is adopted by reference in
				  these rules and is available for inspection at the DEQ, 525 West Allegan
				  Street, Lansing, Michigan. Copies of the regulation may be purchased, at a cost
				  as of the time of adoption of these rules of $45, from the Superintendent of
				  Documents, Government Printing Office, Washington, DC 20401 (stock number
				  869-044-00155-1), or from the DEQ, RRD, 525 West Allegan Street, Lansing,
				  Michigan 48933, at cost.
(S)
				  Criterion defaults to the hazardous substance-specific water solubility
				  limit.
(T) Refer to the federal
				  Toxic Substances Control Act (TSCA), 40 C.F.R. § 761, Subpart D and 40
				  C.F.R. § 761, Subpart G, to determine the applicability of TSCA cleanup
				  standards. Subpart D and Subpart G of 40 C.F.R. § 761 (July 1, 2001) are
				  adopted by reference in these rules and are available for inspection at the
				  DEQ, 525 West Allegan Street, Lansing, Michigan. Copies of the regulations may
				  be purchased, at a cost as of the time of adoption of these rules of $55, from
				  the Superintendent of Documents, Government Printing Office, Washington, DC
				  20401, or from the DEQ, RRD, 525 West Allegan Street, Lansing, Michigan 48933,
				  at cost. Alternatives to compliance with the TSCA standards listed below are
				  possible under 40 C.F.R. § 761 Subpart D. New releases may be subject to
				  the standards identified in 40 C.F.R. § 761, Subpart G. Use Part 201 soil
				  direct contact cleanup criteria in the following table if TSCA standards are
				  not applicable.
Land Use Category
TSCA, Subpart D Cleanup Standards
Part 201 Soil Direct Contact Cleanup
								  Criteria
Residential
1,000 ppb, or 10,000 ppb if capped
4,000 ppb
Nonresidential
1,000 ppb, or 10,000 ppb if capped
16,000 ppb
(U) Hazardous substance may exhibit the
				  characteristic of corrosivity as defined in 40 C.F.R. § 261.22 (revised as
				  of July 1, 2001), which is adopted by reference in these rules and is available
				  for inspection at the DEQ, 525 West Allegan Street, Lansing, Michigan. Copies
				  of the regulation may be purchased, at a cost as of the time of adoption of
				  these rules of $45, from the Superintendent of Documents, Government Printing
				  Office, Washington, DC 20401 (stock number 869-044-00155-1), or from the DEQ,
				  RRD, 525 West Allegan Street, Lansing, Michigan 48933, at cost.
(V) Criterion is the aesthetic drinking water
				  value as required by Section 20120(a)(5) of the NREPA. Concentrations up to 200
				  ug/L may be acceptable, and still allow for drinking water use, as part of a
				  site-specific cleanup under Section 20120a(2) and 20120b of the
				  NREPA.
(W) Concentrations of
				  trihalomethanes in groundwater shall be added together to determine compliance
				  with the Michigan drinking water standard of 80 ug/L. Concentrations of
				  trihalomethanes in soil shall be added together to determine compliance with
				  the drinking water protection criterion of 1,600 ug/kg.
(X) The GSI criterion shown in the generic
				  cleanup criteria tables is not protective for surface water that is used as a
				  drinking water source. For a groundwater discharge to the Great Lakes and their
				  connecting waters or discharge in close proximity to a water supply intake in
				  inland surface waters, the generic GSI criterion shall be the surface water
				  human drinking water value (HDV) listed in the table in this footnote, except
				  for those HDV indicated with an asterisk. For HDV with an asterisk, the generic
				  GSI criterion shall be the lowest of the HDV, the WV, and the calculated FCV.
				  See formulas in footnote (G). Soil protection criteria based on the HDV shall
				  be as listed in the table in this footnote, except for those values with an
				  asterisk. Soil GSI protection criteria based on the HDV shall be as listed in
				  the table in this footnote, except for those values with an asterisk. Soil GSI
				  protection criteria for compounds with an asterisk shall be the greater of 20
				  times the GSI criterion or the GSI soil-water partition values using the GSI
				  criteria developed with the procedure described in this footnote.
Hazardous Substance
Chemical Abstract Service Number
Surface Water Human Drinking Water Values (HDV)
								  (ug/L)
Soil GSI Protection Criteria for HDV
								  (ug/kg)
Acrylamide
79061
0.5 (M); 0.12
10
Alachlor
15972608
3.5
88
Antimony
7440360
2.0 (M); 1.7
1,200
Benzene
71432
12
240
Boron
7440428
4,000
80,000
Bromate
15541454
10 (M); 0.5
200
n-Butanol
71363
3,500
70,000
Butyl benzyl phthalate
85687
6.9
13,000
Cadmium
7440439
2.5*
*
Carbon tetrachloride
56235
5.6
110
Chloride
16887006
50,000
1.0E+6
Chloroethane
75003
170
3,400
Chromium (III)
16065831
120*
*
Cyanazine
21725462
2.0 (M); 0.93
200 (M); 40
1,2-Dichloroethane
107062
6.0
120
trans-1,2-Dichloroethylene
156605
470
9,400
1,2-Dichloropropane
78875
9.1
180
1,3-Dichloropropene
542756
3.3
100 (M); 66
N,N-Dimethylacetamide
127195
700
14,000
1,4-Dioxane
123911
34
680
Ethylene dibromide
106934
0.17
20 (M); 3.4
Ethylene glycol
107211
56,000
1.1E+6
Hexachloroethane
67721
5.3
310
Isophorone
78591
310
6,200
Isopropyl alcohol
67630
28,000
5.6E+5
Lead
7439921
14*
*
Manganese
7439965
1,300*
*
Methanol
67561
14,000
2.8E+5
Methyl-tert-butyl ether (MTBE)
1634044
100
2,000
Methylene chloride
75092
47
940
Molybdenum
7439987
120
2,400
Nitrobenzene
98953
4.7
330 (M); 94
Pentachlorophenol
87865
1.8*
*
Styrene
100425
20
530
1,2,4,5-Tetrachlorobenzene
95943
2.8
3,300
1,1,2,2-Tetrachloroethane
79345
3.2
64
Tetrachloroethylene
127184
11
220
Tetrahydrofuran
109999
350
7,000
Thallium
7440280
2.0 (M); 1.2
1,400
1,2,4-Trichlorobenzene
120821
80
4,700
1,1,2-Trichloroethane
79005
12
240
Trichloroethylene
79016
29
580
Vinyl chloride
75014
1.0 (M); 0.25
40 (M); 20
(Y) Source size modifiers shown in the
				  following table shall be used to determine soil inhalation criteria for ambient
				  air when the source size is not one-half acre. The modifier shall be multiplied
				  by the generic soil inhalation criteria shown in the table of generic cleanup
				  criteria to determine the applicable criterion. See Footnote (C).
Source Size sq. feet or acres
Modifier
400 sq feet
3.17
1000 sq feet
2.2
2000 sq feet
1.76
1/4 acre
1.15
1/2 acre
1
1 acre
0.87
2 acre
0.77
5 acre
0.66
10 acre
0.6
32 acre
0.5
100 acre
0.43
(Z) Mercury is typically measured as total
				  mercury. The generic cleanup criteria, however, are based on data for different
				  species of mercury. Specifically, data for elemental mercury, chemical abstract
				  service (CAS) number 7439976, serve as the basis for the soil volatilization to
				  indoor air criteria, groundwater volatilization to indoor air, and soil
				  inhalation criteria. Data for methyl mercury, CAS number 22967926, serve as the
				  basis for the GSI criterion; and data for mercuric chloride, CAS number
				  7487947, serve as the basis for the drinking water, groundwater contact, soil
				  direct contact, and the groundwater protection criteria. Comparison to criteria
				  shall be based on species-specific analytical data only if sufficient facility
				  characterization has been conducted to rule out the presence of other species
				  of mercury.
(AA) Use 10,000 ug/l
				  where groundwater enters a structure through the use of a water well, sump or
				  other device. Use 28,000 ug/l for all other uses.
(BB) The state drinking water standard for
				  asbestos (fibers greater than 10 micrometers in length) is in units of a
				  million fibers per liter of water (MFL). Soil concentrations of asbestos are
				  determined by polarized light microscopy.
(CC)
Groundwater
:
				  The generic GSI criteria are based on the toxicity of unionized ammonia
				  (NH3); the criteria are 29 ug/L and 53 ug/L for cold
				  water and warm water surface water, respectively. As a result, the GSI
				  criterion shall be compared to the percent of the total ammonia concentration
				  in the groundwater that will become NH3 in the surface
				  water. This percent NH3 is a function of the pH and
				  temperature of the receiving surface water and can be estimated using the
				  following table, taken from Emerson, et al., (Journal of the Fisheries Research
				  Board of Canada, Volume 32(12):2382, 1975).
Percent NH3 in Aqueous Ammonia
					 Solutions for 0-30 &degC and pH 6-10
pH
Temp (&degF)
Temp (&degC)
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
32.0
0
0.00827
0.0261
0.0826
0.261
0.820
2.55
7.64
20.7
45.3
33.8
1
0.00899
0.0284
0.0898
0.284
0.891
2.77
8.25
22.1
47.3
35.6
2
0.00977
0.0309
0.0977
0.308
0.968
3.00
8.90
23.6
49.4
37.4
3
0.0106
0.0336
0.106
0.335
1.05
3.25
9.60
25.1
51.5
39.2
4
0.0115
0.0364
0.115
0.363
1.14
3.52
10.3
26.7
53.5
41.0
5
0.0125
0.0395
0.125
0.394
1.23
3.80
11.1
28.3
55.6
42.8
6
0.0136
0.0429
0.135
0.427
1.34
4.11
11.9
30.0
57.6
44.6
7
0.0147
0.0464
0.147
0.462
1.45
4.44
12.8
31.7
59.5
46.4
8
0.0159
0.0503
0.159
0.501
1.57
4.79
13.7
33.5
61.4
48.2
9
0.0172
0.0544
0.172
0.542
1.69
5.16
14.7
35.3
63.3
50.0
10
0.0186
0.0589
0.186
0.586
1.83
5.56
15.7
37.1
65.1
51.8
11
0.0201
0.0637
0.201
0.633
1.97
5.99
16.8
38.9
66.8
53.6
12
0.0218
0.0688
0.217
0.684
2.13
6.44
17.9
40.8
68.5
55.4
13
0.0235
0.0743
0.235
0.738
2.30
6.92
19.0
42.6
70.2
57.2
14
0.0254
0.0802
0.253
0.796
2.48
7.43
20.2
44.5
71.7
59.0
15
0.0274
0.0865
0.273
0.859
2.67
7.97
21.5
46.4
73.3
60.8
16
0.0295
0.0933
0.294
0.925
2.87
8.54
22.8
48.3
74.7
62.6
17
0.0318
0.101
0.317
0.996
3.08
9.14
24.1
50.2
76.1
64.4
18
0.0343
0.108
0.342
1.07
3.31
9.78
25.5
52.0
77.4
66.2
19
0.0369
0.117
0.368
1.15
3.56
10.5
27.0
53.9
78.7
68.0
20
0.0397
0.125
0.396
1.24
3.82
11.2
28.4
55.7
79.9
69.8
21
0.0427
0.135
0.425
1.33
4.10
11.9
29.9
57.5
81.0
71.6
22
0.0459
0.145
0.457
1.43
4.39
12.7
31.5
59.2
82.1
73.4
23
0.0493
0.156
0.491
1.54
4.70
13.5
33.0
60.9
83.2
75.2
24
0.0530
0.167
0.527
1.65
5.03
14.4
34.6
62.6
84.1
77.0
25
0.0569
0.180
0.566
1.77
5.38
15.3
36.3
64.3
85.1
78.8
26
0.0610
0.193
0.607
1.89
5.75
16.2
37.9
65.9
85.9
80.6
27
0.0654
0.207
0.651
2.03
6.15
17.2
39.6
67.4
86.8
82.4
28
0.0701
0.221
0.697
2.17
6.56
18.2
41.2
68.9
87.3
84.2
29
0.0752
0.237
0.747
2.32
7.00
19.2
42.9
70.4
88.3
86.0
30
0.0805
0.254
0.799
2.48
7.46
20.3
44.6
71.8
89.0
The generic approach for estimating
					 NH3 assumes a default pH of 8 and default temperatures
					 of 68&degF and 85&degF for cold water and warm water surface water,
					 respectively. The resulting percent NH3 is 3.8 percent
					 and 7.2 percent for cold water and warm water, respectively. This default
					 percentage shall be multiplied by the total ammonia-nitrogen
					 (NH3-N) concentration in the groundwater and the
					 resulting NH3 concentration compared to the applicable
					 GSI criterion. As an alternative, the maximum pH and temperature data from the
					 specific receiving surface water can be used to estimate, from the table in
					 this footnote, a lower percent unionized ammonia concentration for comparison
					 to the generic GSI
Soil
: The generic soil GSI
					 protection criteria for unionized ammonia are 580 ug/kg and 1,100 ug/kg for
					 cold water and warm water surface water, respectively.
(DD) Hazardous substance causes developmental
				  effects. Residential direct contact criteria are protective of both prenatal
				  and postnatal exposure. Nonresidential direct contact criteria are protective
				  for a pregnant adult receptor.
(EE)
				  The following are applicable generic GSI criteria as required by Section 20120e
				  of the NREPA.
Hazardous Substance
GSI (ug/L)
Notes
Phosphorus
1,000
Criteria applicable unless receiving water is a
								  surface water that has a phosphorus waste load allocation or is an inland lake.
								  In those cases, contact the department for applicable values.
Total dissolved solids (TDS)
5.0E+5
If TDS data are not available, the TDS criterion
								  may be used a screening level for the sum of the concentrations of the
								  following substances:
calcium, chlorides, iron,
magnesium,
potassium, sodium, sulfate.
Dissolved Oxygen (DO):
Cold receiving waters Warm receiving
								  waters
[GREATER THAN EQUAL TO] 7,000
[GREATER THAN EQUAL TO] 5,000
Since a low level of DO can be harmful to aquatic
								  life, the criterion represents a minimum level that on-site samples must
								  exceed. This is in contrast to other criteria which represent "not to exceed"
								  concentrations. DO criteria are not applicable if groundwater Carbonaceous
								  Biochemical Oxygen Demand (CBOD) is less than 10,000 ug/L and groundwater
								  ammonia concentration is less than 2,000 ug/L.
(FF) The chloride GSI criterion shall be 125
				  mg/l when the discharge is to surface waters of the state designated as public
				  water supply sources or 50 mg/l when the discharge is to the Great Lakes or
				  connecting waters. Chloride GSI criteria shall not apply for surface waters of
				  the state that are not designated as a public water supply source, however, the
				  total dissolved solids criterion is applicable.
(GG) Risk-based criteria are not available
				  for methane due to insufficient toxicity data. An acceptable soil gas
				  concentration (presented for both residential and nonresidential land uses) was
				  derived utilizing 25 percent of the lower explosive level for methane. This
				  equates to 1.25 percent or 8.4E+6 ug/m3.
(HH) The residential criterion for sodium is
				  230,000 ug/l in accordance with the Sodium Advisory Council recommendation and
				  revised Groundwater Discharge Standards.
(II) The residential drinking water criterion
				  for 1,4-dioxane is not calculated using the equations of
				  R 299.10 or the toxicological and
				  chemical-physical data as shown in table 4 of
				  R 299.50. The drinking water criterion
				  is calculated using the United States Environmental Protection Agencys (U.S.
				  EPA) "Toxicological Review of 1,4-Dioxane," EPA/635/R-11/003F, September 2013,
				  and the departments residential exposure algorithms to protect both children
				  and adults from unsafe levels of the chemical. A copy of the U.S. EPAs
				  "Toxicological Review of 1,4-dioxane," may be obtained on the U.S. EPA website,
				  www.epa.gov, free of charge as of the time of adoption of these rules. A copy
				  of the departments residential exposure algorithms may be obtained without
				  charge from the DEQ, RRD, 525 West Allegan Street, Lansing, Michigan 48933.
"ID" means insufficient data to develop criterion.
"NA" means a criterion or value is not available or, in the
					 case of background and CAS numbers, not applicable.
"NLL" means hazardous substance is not likely to leach
					 under most soil conditions.
"NLV" means hazardous substance is not likely to volatilize
					 under most conditions.