Alaska Administrative Code
Title 18 - Environmental Conservation
Chapter 75 - Oil and Other Hazardous Substances Pollution Control
Article 3 - Discharge Reporting, Cleanup, and Disposal of Oil and Other Hazardous Substances
18 AAC 75.341 - Soil cleanup levels; tables

Universal Citation: 18 AK Admin Code 18 AAC 75.341

Current through February 27, 2024

(a) If a responsible person uses method one for petroleum hydrocarbons for a non-Arctic zone under 18 AAC 75.340, the soil cleanup levels must be based on Table A1 in this subsection. TABLE A1. METHOD ONE - PETROLEUM HYDROCARBON SOIL CLEANUP LEVELS IN NONARCTIC ZONES (See notes to table for further requirements) Part A: Determine score for each item* 1. Depth to Groundwater Less than 5 feet (10) 5 feet to 15 feet (8) More than 15 feet to 25 feet (6) More than 25 feet to 50 feet (4) More than 50 feet (1) 2. Mean Annual Precipitation More than 40 inches (10) More than 25 inches to 40 inches (5) 15 inches to 25 inches (3) Less than 15 inches (1) 3. Soil Type (Unified Soil Classification) Clean, course-grained soils (10) Coarse-grained soils with fines (8) Fine-grained soils (low organic carbon) (3) Fine-grained soils (high organic carbon) (1) 4. Potential Receptors (Select the most applicable category) a. Public water system within 1000 feet, or private water system within 500 feet (15) b. Public/private water system within 1/2 mile (12) c. Public/private water system within one mile (8) d. No water system within one mile (4) e. Nonpotable groundwater (1) 5. Volume of Contaminated Soil More than 500 cubic yards (10) More than 100 cubic yards to 500 cubic yards (8) More than 25 cubic yards to 100 cubic yards (5) 10 cubic yards to 25 cubic yards (2) Less than 10 cubic yards (0)

*The items to be scored are defined in note 1 to this table.

Part B: Add scores from Part A to determine matrix score and cleanup level

Cleanup Level in mg/kg Gasoline Diesel Residual Matrix Score for Range Range Range Each Category Organics Organics Organics Category A: More 50 100 2000 than 40 Category B: 26 - 40 100 200 2000 Category C: 21 - 26 500 1000 2000 Category D: Less 1000 2000 2000 than 21

Notes to Table A1:

1. The following definitions for items 1 - 5 in Part A apply for purposes of using method one:
a. "depth to groundwater" means the measurement from the lowest point of the zone of soil contamination to the seasonal high groundwater table; a responsible person may not claim a lower matrix score for soil by moving contaminated soil to a higher elevation relative to the groundwater table;

b. "mean annual precipitation" is defined at 18 AAC 75.990;

c. "soil type" means the predominant Unified Soil Classification (USC) soil type between the deepest point of contamination and the seasonal high groundwater table; a responsible person may seek to demonstrate that otherwise coarse-grained soil has an organic carbon content that might enable a lower point classification. Soil types using the USC system are further defined as shown in Figure 1: Figure 1 SOIL TYPE UNIFIED SOILS CLASSIFICATIONS Clean coarse-grained GW, GP, SW, SP Coarse-grained with fines GM, GC, SM, SC, GP-GC, SP-SM, GW-GM, SW-SM, SW-SC Fine-grained with low organic carbon ML, CL, HM, CH Fine-grained with high organic carbon OL, OH, Pt

d. for the "potential receptors" categories,
(i) "public water system" and "private water system" have the meaning given those terms in 18 AAC 80.1990;

(ii) "nonpotable" means unusable for drinking water due to a water quality condition, such as salinity, that was not caused by or that does not arise from contamination at the site;

e. "volume of contaminated soil" means the total estimated volume of soil that is contaminated above the applicable cleanup level before a responsible person begins a removal or cleanup action.

2. For the "potential receptors" categories, a responsible person shall submit a demonstration supporting the score assigned, including the results of an approved water well survey; the most conservative score must be used to determine the proximity of potential receptors; for example, if a water system is within one-quarter mile, the category, "public/private water system within one mile" that would score 8 would be superseded by the category "public/private water system within 1/2 mile" that would score 12.

3. The identity of a released refined petroleum product must be assumed to be unknown unless a responsible person demonstrates that the product is only gasoline, or only a refined nongasoline product; the department will waive the requirement that a product be identified by analysis if a responsible person demonstrates that only one type of product was stored or distributed at the site; the soil cleanup levels in Part B are based on gas chromatographic analytical measurements corresponding to a specific measured range of petroleum hydrocarbons as follows:
a. gasoline range organics: light-range petroleum products such as gasoline, with petroleum hydrocarbon compounds corresponding to an alkane range from the beginning of C6 to the beginning of C10 and a boiling point range between approximately 60º Centigrade and 170º Centigrade;

b. diesel range organics: mid-range petroleum products such as diesel fuel, with petroleum hydrocarbon compounds corresponding to an alkane range from the beginning of C10 to the beginning of C25 and a boiling point range between approximately 170º Centigrade and 400º Centigrade;

c. residual range organics: heavy-range petroleum products such a lubricating oils, with petroleum hydrocarbon compounds corresponding to an alkane range from the beginning of C25 to the beginning of C36 and a boiling point range between approximately 400º Centigrade and 500º Centigrade.

4. In addition to meeting the soil cleanup levels in Part B, a responsible person shall ensure that the site meets the most stringent standards for benzene, toluene, ethylbenzene, and total xylenes for the applicable exposure pathway in Table B1 in (c) of this section.

(b) If a responsible person uses method one for petroleum hydrocarbons for an Arctic zone under 18 AAC 75.340, the soil cleanup levels must be based on Table A2 in this subsection. TABLE A2. METHOD ONE - PETROLEUM HYDROCARBON SOIL CLEANUP LEVELS IN ARCTIC ZONES Cleanup Level in mg/kg Product Diesel Gasoline Residual Range Range Range Petroleum Petroleum Petroleum Hydrocarbons Hydrocarbons Hydrocarbons Gasoline N/A 100 N/A Diesel 200* N/A N/A Unknown/Crude 200 100 N/A Residual N/A N/A 2000

In this table, "N/A" means "not applicable."

*If a responsible party demonstrates that contamination is due to a diesel spill, that levels of benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) are less than 15 mg/kg, that benzene levels are less than 0.5 mg/kg, and that other site conditions are favorable, and if the department determines that a less stringent level is protective of human health, safety, and welfare, and of the environment, the department will allow a cleanup level of 500 mg/kg for diesel range petroleum hydrocarbons.

The Arctic Zone numeric cleanup levels in this table cover only contamination related to manmade pads and roads. The department will determine the cleanup levels for undisturbed tundra or other undisturbed native vegetation on a site-specific basis, depending upon whether a cleanup action would cause more severe or long-term damage than would the discharge or release alone.

(c) If a responsible person uses method two for chemica ls other than petroleum hydrocarbons under 18 AAC 75.340, the soil cleanup levels must be based on Table B1 in this subsection.

TABLE B1. METHOD TWO - SOIL CLEANUP LEVELS TABLE (See notes for additional requirements)

Hazardous Substance

CAS Number1

health effect that drives risk: carcinogenic (a); noncarcinogen (nc); mutasren (m)

Arctic Zone2

Under 40 Inch

Zone3

Over 40 Inch Zone4

Migration to Groundwater6 (mg/kg)

Human Health5 (mg/kg)

Human Health5 (mg/kg)

Human Health5 (mg/kg)

Acenaphthene7

83-32-9

nc

6300

4600

3800

37

Acenaphthylene7x

208-96-8

nc

3100

2300

1900

18

Acetone

67-64-1

nc

1.0 x 10 5. 9

81000

65000

38

Aldrin

309-00-2

ca

0.67

0.49

0.40

0.0099

Ammonium Perchlorate

7790-98-9

nc

96

71

58

0.037

Anthracene7

120-12-7

nc

31000

23000

19000

390

Antimony (metallic)

7440-36-0

nc

55

41

33

4.6

Arsenic, Inorganic11

7440-38-2

ca

12

8.8

7.2

0.20

Barium

7440-39-3

nc

25000

20000

17000

2100

Benz[a]anthracene7

56-55-3

m

2.7

2.0

1.7

0.28

Benzaldehyde

100-52-7

nc

77010

77010

77010

0.52

Benzene7

71-43-2

ca

16

11

8.1

0.022

Benzo[a]pyrene7

50-32-8

m

0.28

0.20

0.17

0.27

Benzo[b] fluoranthene7

205-99-2

m

2.8

2.0

1.7

2.7

Benzo[g,h.i]perylene7,8

191-24-2

nc

3100

2300

1900

15000

Benzo[k]fluoranthene7

207-08-9

m

28

20

17

27

Benzoic Acid

55-85-0

nc

1.0 x 10 5. 9

1.0 x 10 5. 9

1.0 x 10 5. 9

200

Benzyl Alcohol

100-51-6

nc

11000

8200

6700

5.7

Beryllium and compounds

7440-41-7

nc

270

200

170

260

Bis(2-chloroethyl)ether

111 -44-4

ca

4.0

2.8

2.1

0.00042

Bis(2-ethyIhexyl)phthalate

117-81-7

ca

680

500

410

88

Bromobenzene

108-86-1

nc

16010

16010

16010

0.36

Bromodichloromethane

75-27-4

ca

5.3

3.6

2.6

0.0043

Bromoform

75-25-2

ca

340

240

170

0.10

Bromomethane

74-83-9

nc

15

10

7.4

0.024

Butadiene, 1,3-

106-99-0

ca

1.2

0.86

0.64

0.0012

Butanol, N-

71-36-3

nc

650010

650010

650010

5.3

Butyl Benzyl Phthalate

85-68-7

ca

5000

3700

3000

16

Butylbenzene, n-

104-51-8

nc

20 10

2010

2010

23

Butylbenzene, sec-

135-98-8

nc

28 10

2810

2810

42

Butylbenzene, tert-

98-06-6

nc

3510

3510

3510

11

Cadmium (Diet)

7440-43-9

nc

120

92

76

9.1

Carbon Disulfide

75-15-0

nc

50010

50010

50010

2.9

Carbon Tetrachloride

56-23-5

ca

13

9.1

6.6

0.021

Chlordane

12789-03-6

ca

29

22

17

0.18

Chlordecone(Kepone)

143-50-0

ca

0.95

0.70

0.58

0.0083

Chloroaniline, p-

106-47-8

ca

47

35

29

0.015

Chlorobenzene

108-90-7

nc

18010

18010

18010

0.46

Chloroform

67-66-3

ca

5.8

4.0

2.9

0.0071

Chloromethane

74-87-3

nc

250

170

120

0.61

Chloronaphtlhalene, Beta-

91-58-7

nc

8400

6200

5100

26

Chlorophenol, 2-

95-57-8

nc

680

510

410

0.71

Chromium(III), Insoluble Salts12

16065-83-1

nc

1.0 x 105, 9

1.0 x 10 5, 9

1.0 x 10 5, 9

1.0 x 10 5, 9

Chromium(VI)12

18540-29-9

m

4.9

3.9

3.2

0.089

Chrysene7

218-01-9

m

280

200

170

82

Copper

7440-50-8

nc

5500

4100

3400

370

Cresol, m-

108-39-4

nc

5500

4100

3400

6.1

Cresol, o-

95-48-7

nc

5500

4100

3400

6.2

Cresol, p-

106-44-5

nc

11000

8200

6700

12

Cumene

98-82-8

nc

54 10

5410

5410

5.6

Cyanide (CN-)13

57-12-5

nc

48

34

26

0.20

Cyclohexane

110-82-7

nc

7710

7710

7710

150

DDD

72-54-8

ca

40

29

24

0.49

DDE. p,p'-

72-55-9

ca

34

25

20

0.72

DDT

50-29-3

ca

33

24

20

5.1

Dibenz[a,h]anthracene7

53-70-3

m

0.28

0.20

0.17

0.87

Dibenzofuran

132-64-9

nc

130

95

77

0.97

Dibromochloromethane

124-48-1

ca

140

110

88

0.0027

Dibromoethane. 1.2- (Ethylene Dibromide)

106-93-4

ca

0.62

0.42

0.31

0.00024

Dibromomethane (Methylene Bromide)

74-95-3

nc

45

31

22

0.025

Dibutyl Phthalate

84-74-2

nc

11000

8200

6700

16

Dichlorobenzene, 1.2-

95-50-1

nc

7810

7810

78 10

2.4

Dichlorobenzene, 1,3-8

541-73-1

nc

6210

6210

6210

2.3

Dichlorobenzene. 1.4-

106-46-7

ca

31

21

15

0.037

Dichlorobenzidine. 3,3'-

91-94-1

ca

21

16

13

0.056

Dichlorodifluoromethane

75-71-8

nc

220

150

110

3.9

Diehloroethane, 1.1-

75-34-3

ca

67

46

33

0.092

Diehloroethane, 1.2-

107-06-2

ca

7.9

5.5

3.9

0.0055

Dichloroeihylene, 1,1-

75-35-4

nc

480

330

240

1.2

Dichloroethylene, 1,2-cis-

156-59-2

nc

270

200

170

0.12

Dichloroethylene, 1,2-trans-

156-60-5

nc

96010

96010

96010

1.3

Dichlorophenol. 2.4-

120-83-2

nc

330

250

200

0.21

Dichlorophenoxy Acetie Acid, 2.4-

94-75-7

nc

1200

910

740

0.53

Dichloropropane, 1,2-

78-87-5

ca

16

11

8.0

0.016

Dichloropropene, 1,3-

542-75-6

ca

29

21

15

0.018

Dieldrin

60-57-1

ca

0.59

0.44

0.36

0.0047

Diethyl Phthalate

84-66-2

nc

88000

66000

54000

60

Dimethylphenol, 2.4-

105-67-9

nc

2200

1600

1300

3.2

Dimethylphthalate8

131-1 1-3

nc

88000

66000

54000

48

Dinitrobenzene, 1,2-

528-29-0

nc

11

8.2

6.7

0.014

Dinitrobenzene, 1.3-

99-65-0

nc

11

8.2

6.7

0.014

Dinitrobenzene, 1.4-

100-25-4

nc

11

8.2

6.7

0.014

Dinitrophenol, 2,4-

51-28-5

nc

220

160

130

0.34

Dinitrotoluene, 2,4-

121-14-2

ca

30

23

18

0.024

Dinitrololuene, 2.6-

606-20-2

ca

6.3

4.7

3.8

0.0050

Dinitrotoluene, 2-A mino-4,6-

35572-78-2

nc

270

200

160

0.25

Dinitrololuene, 4-A mino-2,6-

19406-51-0

nc

270

200

160

0.25

Dioxane, 1,4-

123-91-1

ca

100

73

58

0.012

Diphenylamine

122-39-4

nc

2800

2000

1700

4.3

Endosulfan

1 15-29-7

nc

820

610

500

9.3

Endrin

72-20-8

nc

33

25

20

0.61

Ethyl Chloride

75-00-3

nc

140010

I40010

140010

72

Ethylbenzene7

100-41-4

ca

72

49

35

0.13

Ethylene Glycol

107-21-1

nc

1.0 x 10 5, 9

1.0 x 10 5, 9

1.0 x 10 5, 9

110

Fluoranthene7

206-44-0

nc

4200

3100

2500

590

Fluorene7

86-73-7

nc

4200

3100

2500

36

Formaldehyde

50-00-0

ca

430

290

210

0.011

Heptachlor

76-44-8

ca

2.2

1.6

1.3

0.0076

Heptachlor Epoxide

1024-57-3

ca

1.2

0.86

0.69

0.0019

Hexachlorobenzene

118-74-1

ca

2.8

2.0

1.5

0.0082

Hexachlorobutadiene

87-68-3

nc

3.310

3.310

3.310

0.020

Hexachlorocyclohexane, Alpha-

319-84-6

ca

1.5

1.1

0.91

0.0029

Hexachlorocyclohexane, Bela-

319-85-7

ca

5.3

3.9

3.2

0.010

Hexachlorocyclohexane, Gamma- (Lindane)

58-89-9

ca

9.9

7.4

6.0

0.016

Hexachlorocyclopentadiene

77-47-4

nc

2.0

1.4

1.0

0.0093

Hexachloroethane

67-72-1

ca

24

17

12

0.018

Hexahydro-l,3.5-trinitro-1.3,5-triazine (RDX)

121-82-4

ca

110

79

64

0.027

Hexane, N-

110-54-3

nc

13010

13010

13010

13010

Hexanone, 2-

591-78-6

nc

380

270

210

0.11

Hydrazine

302-01-2

ca

0.79

0.55

0.40

2.9 x 10-5

Indeno[1,2,3-cd]pyrene7

193-39-5

m

2.8

2.0

1.7

8.8

Isophorone

78-59-1

ca

10000

7400

6100

2.7

Isopropanol

67-63-0

nc

14000

9500

6800

1.1

Load and Compounds14

7439-92-1

nc

400

400

400

n/a-6

Mercuric Chloride8

7487-94-7

nc

41

30

25

3.9

Mercury (elemental)

7439-97-6

nc

3.110

3.110

3.110

0.36

Methanol

67-56-1

nc

1.0 x 10 5.9

1.0 x 105.9

1.0 x 10 5.9

54

Methoxychlor

72-43-5

nc

550

410

340

13

Methyl Ethyl Ketone (2-Butanone)

78-93-3

nc

23000 10

2300010

23000 10

15

Methyl Isobulyl Ketone (4-methyl-2-penlanone)

108-10-1

nc

2200 10

220010

2200 10

18

Methyl Mercury

22967-92-6

nc

14

10

8.3

180

Methyl tert-Butyl Ether (MTBE)

1634-04-4

ca

970

670

480

0.40

Methylene Chloride

75-09-2

nc

630

460

360

0.33

Methylnaphthalene, 1 -

90-12-0

ca

6810

6810

6810

0.41

Methylnaphthalene, 2-

91-57-6

nc

420

310

250

1.3

Naphthalene7

91-20-3

ca

42

29

20

0.038

Nickel Soluble Salts

7440-02-0

nc

2600

2000

1700

340

Nitrobenzene

98-95-3

ca

63

43

31

0.0079

Nitroglycerin

55-63-0

nc

11

8.2

6.7

0.0082

Nitroguanidine

556-88-7

nc

11000

8200

6700

5.8

Nitrosodimethylamine, N-

62-75-9

m

0.036

0.026

0.020

3.3 x 10-6

Nitroso-di-N-propylamine, N-

621 -64-7

ca

1.4

1.00

0.82

0.00068

Nitrosodiphenylamine, N-

86-30-6

ca

1900

1400

1200

4.6

Nitrotoluene, m-

99-08-1

nc

11

8.2

6.7

0.013

Nitrotoluene, o-

88-72-2

ca

55

41

34

0.024

Nitrotoluene, p-

99-99-0

nc

440

330

270

0.32

Octahydro-1.3, 5.7-tetranitro-1.3, 5.7-tctrazocine (HMX)

2691-41-0

nc

6700

5000

4100

9.7

Octyl Phthalate, di-N-

117-84-0

nc

1100

820

670

370

Pentachlorophenol

87-86-5

ca

18

13

11

0.0043

Pentaerythritol tetranitrate (PETN)

78-11-5

nc

220

160

130

0.43

Perfluorooctane, Sulfonate-(PFOS)-20

1763-23-1

nc

2.2

1.6

1.3

0.0030

Perfluorooctanoic Acid (PFOA)-20

335-67-1

nc

2.2

1.6

1.3

0.0017

Phenanthrene7, 8

85-01-8

nc

3100

2300

1900

39

Phenol

108-95-2

nc

33000

25000

20000

29

Phosphorus, White

7723-14-0

nc

2.7

2.0

1.7

0.020

Polychlorinaled Biphenyls (total)15

1336-36-3

ca

1.0

1.0

1.0

n/a-6

Propyl benzene

103-65-1

nc

5210

5210

52 10

9.1

Pyrene7

129-00-0

nc

3100

2300

1900

87

Selenium

7782-49-2

nc

680

510

410

6.9

Silver

7440-22-4

nc

680

510

410

11

Styrene

100-42-5

nc

180 10

18010

18010

10

TCDD, 2,3,7,8-16

1746-01-6

ca

8.2 x 10-5

6.0 x 10-5

4.9 x 10-5

3.9 x 10-6

Tetraehlorocthane,1.1.1.2-

630-20-6

ca

30

21

15

0.022

Tetrachlorocthane.1.1.2.2-

79-34-5

ca

8.8

6.1

4.4

0.0030

Tetrachloroethylene

127-18-4

nc

68 10

6810

6810

0.19

Tetryl (Trinitrophenylmethy lnitramine)

479-45-8

nc

270

200

170

2.5

Thallium (Soluble Salts)

7440-28-0

nc

1.4

1.00

0.83

0.19

Toluene7

108-88-3

nc

20010

20010

20010

6.7

Toxaphene

8001-35-2

ca

8.6

6.4

5.2

0.72

Trichloro-1 ,2,2-trifluoroethane, 1,1,2-

76-13-1

nc

74010

74010

74010

1700

Trichlorobenzene, 1,2,3-

87-61-6

nc

110

81

66

0.15

Trichlorobenzene, 1.2,4-

120-82-1

nc

65

45

32

0.082

Trichloroethane, 1,1,1-

71-55-6

nc

36010

36010

36010

32

Trichloroethane, 1.1,2-

79-00-5

nc

2.3

1.6

1.1

0.0014

Trichloroethylene

79-01-6

nc

7.1

4.9

3.5

0.011

Trichlorofluoromethane

75-69-4

nc

980 10

98010

980 10

41

Trichlorophenol, 2,4,5-

95-95-4

nc

11000

8200

6700

28

Trichlorophenol, 2,4,6-

88-06-2

nc

110

82

67

0.092

Trichlorophenoxyacetic Acid. 2,4.5-

93-76-5

nc

1100

820

670

0.66

Trichlorophenoxypropionic acid. -2,4.5

93-72-1

nc

880

660

540

0.55

Trichloropropane, 1,2,3-

96-18-4

m

0.089

0.066

0.054

3.1 x 10 -5

Trimethylbenzene, 1.2,4-

95-63-6

nc

4310

4310

33

0.16

Trimethylbenzene, 1,3,5-

108-67-8

nc

37 10

3710

3710

1.3

Tri-n-butyltin

688-73-3

nc

41

30

25

0.68

Trinitrobenzene, 1,3,5-

99-35-4

nc

3900

2900

2400

15

Trinitrotoluene, 2,4,6-

118-96-7

nc

64

47

39

0.39

Vanadium and Compounds

7440-62-2

nc

680

510

420

1100

Vinyl Acetate

108-05-4

nc

2100

1400

1000

1.1

Vinyl Chloride

75-01-4

ca

0.69

0.65

0.61

0.00080

Xylenes7

1330-20-7

nc

5710

5710

5710

1.5

Zinc and Compounds

7440-66-6

nc

41000

30000

25000

4900

See notes to table for further requirements "n/a" means not applicable.

NOTES TO TABLE B1 FOLLOW TABLE B2 IN (d) OF THIS SECTION

(d) If a responsible person uses method two for petroleum hydrocarbons under 18 AAC 75.340, the soil cleanup levels must be based on Table B2 in this subsection.

TABLE B2. METHOD TWO - PETROLEUM HYDROCARBON SOIL CLEANUP LEVELS

Petroleum Hydrocarbon Range

Arctic Zone2 mg/kg

Under 40 Inch Zone3

Over 40 Inch Zone4

Maximum Allowable Concentrations17mg/kg

Ingestion (mg/kg)18

Inhalation (mg/kg)19

Migration to Groundwater (mg/kg)6

Ingestion (mg/kg)18

Inhalation (mg/kg)19

Migration to groundwater (mg/kg)6

Ingestion (mg/kg)18

Inhalation (mg/kg)19

Migration to Groundwater (mg/kg)6

For Laboratory Analysis using AK Methods 101, 102, and 103

C6-C10 GRO using AK 101

1400

1400

n/a

1400

1400

300

1400

1400

260

1400

C10-C25 DRO using AK 102

12500

12500

n/a

10250

12500

250

8250

12500

230

12500

C25-C36 RRO using AK 103

13700

22000

n/a

10000

22000

11000

8300

22000

9700

22000

For Laboratory Analysis using AK Aliphatic and Aromatic Fraction Methods 101AA, 102AA, and 103AA

C6-C10 Aliphatics

1000

1000

n/a

1000

1000

270

1000

1000

240

1000

C6-C10 Aromatics

1000

1000

n/a

1000

1000

150

1000

1000

130

1000

C10-C25 Aliphatics

10000

10000

n/a

10000

10000

7200

8300

10000

6400

10000

C10-C25 Aromatics

5000

5000

n/a

4100

5000

100

3300

5000

90

5000

C25-C36 Aliphatics

20000

20000

n/a

20000

20000

20000

20000

20000

20000

20000

C25-C36 Aromatics

4100

10000

n/a

3000

10000

3300

2500

10000

2900

10000

See notes to table for further requirements, "n/a" means not applicable.

Notes to Tables B1 and B2:

If applicable, alternative cleanup levels must be protective of migration to surface water. Concenlrations of hazardous substances in soil musl be calculaled and presenled on a per dry weight basis. For volatile organic hazardous subslances for which toxicity data are not currently available or calculated levels exceed the calculaled saturalion concentration, the cleanup level lhat applies at a site is the calculated saturation concentration determined using lhe equalions sel out in the Procedures for Calculating Cleanup Levels, adopted by reference in 18 AAC 75.340. The cleanup level from Table B1 or B2 thal applies at a site is the most stringenl of lhe applicable exposure pathway-specific cleanup levels based on human health, ingestion, inhalation, or migration to groundwater. Where the superscript figure "9" follows the exponent "105", separated by a semicolon, the figure "9" refers to Note 9.

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1. "CAS Number" means the Chemical Abstracl Service (CAS) registry number uniquely assigned to chemicals by the American Chemical Society and recorded in the CAS Registry System.

2. "Arctic zone" is defined at 18 AAC 75.990.

3. "Under 40 inch zone" means a sile lhat receives mean annual precipitation of less lhan 40 inches each year.

4. "Over 40 inch zone" means a site thal receives mean annual precipitation of 40 or more inches each year.

5. The "Human Health" exposure pathway is the cumulalive exposure pathway through dermal contact, ingestion, and inhalation of volatile and particulate compounds from hazardous substances in the soil, but excludes the vapor intrusion pathway of indoor air inhalation.

6. The "Migration to groundwater" exposure pathway is the potential for hazardous substances to leach to groundwater where they may result in a compleled human health exposure pathway through dermal contact, ingestion, or inhalation of contaminants at or above levels listed in Table C at 18 AAC 75.345(b)(1); soil cleanup levels protective of migration to surface water must be determined on a site-specific basis.

7. If using method two or method three, the applicable petroleum hydrocarbon cleanup levels must be met in addition to the applicable chemical-specific cleanup levels for benzene, ethylbenzene, toluene, and total xylenes; the chemica l-specific cleanup levels for the polynuclear aromatic hydrocarbons acenaphthene, acenapthylene, anthraccne, benz[a]anthracene, benzo[ a] pyrene, benzo[b] fluoran thene, benzo[ k] fluoran thene, benzo [g, h ,i] pyrene, chrysene, dibenz[a,h]anthracene, fluoranthene, fluorene, indeno[ 1,2,3-c,d]pyrene, naphthalene, phenanthrene, and pyrene must also be met unless the department determines that those cleanup levels need not be met to protect human health, safety, and welfare, and the environmenl.

8. Where one or more toxicological values were unavail able, toxicity values from surrogate compounds or other sources were used as foliows:
(A) pyrene is a toxicity surrogate for acenaphthylene, benzo(g,h,i) perylene, and phenanthrene;

(B) 1,2-dichlorobenzene is a toxicity surrogate for 1,3 -dichlorobenzene;

(C) diethylphthalate is a toxicity surrogate for dimethylphthalate;

(D) elemental mercury is a toxicity surrogate for mercuric chloride.

9. The ceiling limit of 100,000 mg/kg is equivalent to a chemical representing 10 percent by weight of the soil sample. At this contaminant concentration and higher. the assumptions for soil contact may be violated (for example, soil adherence and wind-borne dispersion assumptions) due to the presence of the foreign substance itself.

10. These levels are based on soil saturation level (Csat) using the equations set out in Procedures for Calculating Cleanup Levels, adopted by reference in 18 AAC 75 .340. Refer to the Procedures for Calculating Cumulative Risk, adopted by reference in 18 AAC 75.325, for inhalation risk screening levels.

11. Due to the prevalence of naturally occurring arsenic throughout the state, arsenic at a site will be considered background arsenic unless anthropogenic contribution from a source, activity, or mobilization by means of another introduced contaminant is known or suspected.

12. Due to the prevalence of naturally occuring chromium III throughout the state, sample results reported for total chromium detected at a site will be considered background chromium III unless anthropogenic contribution of chromium III or VI from a source, activity, or mobilization by means of another introduced contaminant is known or suspected. The calculated chromium III migration to groundwater cleanup level exceeds 1,000,000 parts per million.

13. Cyanide expressed as free, or physiologically available cyanide.

14. Lead cleanup levels are based on land use; for residential land use, the soil cleanup level is 400 mg/kg. For commercial or industrial land use, as applied in 18 AAC 75.340(e)(3), the soil cleanup level is 800 mg/kg; through an approved site-specific risk assessment, conducted according to the Risk Assessment Procedures Manual, adopted by reference in 18 AAC 75.340, approved exposure models may be used to evaluate exposure to a child resident or an adult worker; a responsible person may also propose an alternative cleanup level, through a site specific risk assessment conducted according to the Risk Assessment Procedures Manual, and based on a chemical speciation of the lead present at the site. For soils contaminated wi th l ead more than 15 feet below ground surface, lead cleanup levels will be determined on a site-specific basis.

15. For unrestricted land use, polychlorinated biphenyls (PCBs) in soil shall be cleaned up to the listed value, unless the department determines that a different cleanup level is necessary as provided in 18 AAC 75.340(i); with the prior approval of the department, PCBs in soil may be cleaned up to
(A) between 1 and 10 mg/kg if the responsible person
(i) caps each area containing PCBs in soil at levels between 1 and 10 mg/kg; for purposes of this Note 15, "caps" means covering an area of PCB contaminated soil with an appropriate material to prevent exposure of humans and the environment to PCBs; to be approved, a cap must be designed and constructed of a materi al acceptable to the department and of sufficient strength and durability to withstand the use of the surface that is exposed to the environment; within 72 hours after discovery of a breach to the integrity of a cap, the responsible person or the landowner shall initiate repairs to that breach; and

(ii) provides the department within 60 clays after completing the cleanup, documentation that the responsible person has recorded a deed notation in the appropriate land records, or on another instrument that is normally examined during a title search, documenting that PCBs remain in the soil, that the contaminated soil has been capped, and that subsequent interest holders may have legal obligations with respect to the cap and the contaminated soil; or

(B) an alternative PCB soil cleanup level developed through an approved site-specific risk assessment, conducted according to the Risk Assessment Procedures Manual, adopted by reference at 18 AAC 75.340.

16. This cleanup level is for 2,3,7,8-Tetrachlorordibenzo-p-Dioxin (TCDD) only; all cleanup levels for polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF) congeners must be determined on a site-specific basis.

17. This level is the concentration or C6 - C10, C10 - C25, or C25 - C36 petroleum hydrocarbon range in surface and subsurface soil that if exceeded, indicates an increased potential for hazardous substance migration or for risk to human health, safety, or welfare, or to the environment; the level of a petroleum hydrocarbon may not remain at a concentration above the maximum allowable concentration unless a responsible person demonstrates that the petroleum hydrocarbon will not migrate and will not pose a significant risk to human health, safety, or welfare, or to the environment; free product must be recovered as required by 18 AAC 75.325(f).

18. "Ingestion" means a potential pathway or exposure to hazardous substances th rough direct consumption of the soil.

19 "Inhalation" means a potential pathway to volatile organic hazardous substances in the soil through volatilization.

20. Toxicity values for PFOS and PFOA were sourced from EPA's Health Effects Support Document for Perfluorooctane Sulfanate (PFOS) (EPA 822-R-16-002), dated May 2016, and Health Effects Supports Document for Perfluorooctanatic Acid (PFOA) (EPA 822-R-16-003), dated May 2016.

The applicable EPA rule governing disposal and cleanup of PCB contaminated facilities under 40 C.F.R. Part 761.61 (PCB remediation waste) may apply to PCB cleanup at a contaminated site. The PCB cleanup levels listed in Table B1 are based on cleanup levels referred to in 40 C.F.R. 761.61 for high occupancy areas with no cap.

Authority:AS 46.03.020

AS 46.03.050

AS 46.03.710

AS 46.03.740

AS 46.03.745

AS 46.04.020

AS 46.04.070

AS 46.09.020

Disclaimer: These regulations may not be the most recent version. Alaska may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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