ConocoPhillips ‐ Billings, Montana

Aggregate Hazard Index and Cancer Risk

Chemical Name

Groundwater Pathway

Aggregate Hazard

Quotient

Surface Pathway

Aggregate Hazard

Quotient Total HI

Groundwater

Pathway

Aggregate Risk

Surface Pathway

Aggregate Cancer

Risk Total CR

Acenaphthene 1.86E‐05 2.04E‐07 1.88E‐05 ‐‐‐ ‐‐‐

Anthracene 7.35E‐07 4.01E‐07 1.14E‐06 ‐‐‐ ‐‐‐

Antimony 7.56E‐04 5.99E‐07 7.57E‐04 ‐‐‐ ‐‐‐

Arsenic 2.17E‐02 6.55E‐05 2.18E‐02 5.23E‐06 1.25E‐08 5.24E‐06

Barium 2.32E‐04 5.03E‐06 2.37E‐04 ‐‐‐ ‐‐‐

Benz(a)anthracene ‐‐‐ ‐‐‐ 2.15E‐09 1.21E‐08 1.43E‐08

Benzene 2.66E‐04 2.18E‐09 2.66E‐04 2.78E‐08 2.26E‐13 2.78E‐08

Benzo(a)pyrene ‐‐‐ ‐‐‐ 6.68E‐12 6.82E‐08 6.82E‐08

Benzo(b)fluoranthene ‐‐‐ ‐‐‐ 9.10E‐13 3.46E‐09 3.46E‐09

Benzo(k)fluoranthene ‐‐‐ ‐‐‐ 3.98E‐28 3.22E‐10 3.22E‐10

Beryllium 5.78E‐04 6.74E‐08 5.78E‐04 ‐‐‐ 1.32E‐12 1.32E‐12

Bis(2‐ethylhexyl)phthalate 6.84E‐34 2.13E‐09 2.13E‐09 4.66E‐38 1.36E‐13 1.36E‐13

Butyl benzyl phthalate 5.86E‐07 8.37E‐09 5.94E‐07 ‐‐‐ ‐‐‐

Cadmium 4.91E‐04 7.21E‐06 4.98E‐04 ‐‐‐ 1.11E‐11 1.11E‐11

Carbon disulfide 2.05E‐05 7.73E‐11 2.05E‐05 ‐‐‐ ‐‐‐

Chlorobenzene 1.06E‐04 1.81E‐10 1.06E‐04 ‐‐‐ ‐‐‐

Chloroform 8.48E‐05 3.45E‐10 8.48E‐05 3.50E‐08 3.59E‐13 3.50E‐08

Chromium 4.62E‐05 1.09E‐06 4.73E‐05 ‐‐‐ 7.73E‐09 7.73E‐09

Chrysene ‐‐‐ ‐‐‐ 3.43E‐11 1.44E‐10 1.78E‐10

Cobalt 9.61E‐04 3.62E‐05 9.97E‐04 ‐‐‐ 9.31E‐10 9.31E‐10

Cresol m‐ 2.77E‐05 2.17E‐09 2.77E‐05 ‐‐‐ ‐‐‐

Cresol o‐ 1.17E‐06 2.28E‐10 1.17E‐06 ‐‐‐ ‐‐‐

Cresol p‐ 2.77E‐04 2.12E‐08 2.77E‐04 ‐‐‐ ‐‐‐

Cyanide 7.27E‐06 7.17E‐07 7.99E‐06 ‐‐‐ ‐‐‐

Dibenz(a,h)anthracene ‐‐‐ ‐‐‐ 6.20E‐22 7.34E‐09 7.34E‐09

Dichlorobenzene 1,2‐ 2.64E‐05 8.24E‐11 2.64E‐05 ‐‐‐ ‐‐‐

Dichlorobenzene 1,3‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐

Dichlorobenzene 1,4‐ 3.19E‐06 3.71E‐13 3.19E‐06 9.33E‐09 8.27E‐14 9.33E‐09

Dichloroethane 1,1‐ 7.59E‐06 8.60E‐11 7.59E‐06 ‐‐‐ ‐‐‐

Dichloroethane 1,2‐ 2.34E‐05 2.80E‐11 2.34E‐05 4.66E‐08 2.02E‐13 4.66E‐08

Dichloroethylene 1,1‐ 3.08E‐05 5.60E‐10 3.08E‐05 ‐‐‐ ‐‐‐

Diethyl phthalate 1.70E‐08 1.77E‐11 1.70E‐08 ‐‐‐ ‐‐‐

Dimethyl phthalate 2.56E‐09 5.21E‐13 2.56E‐09 ‐‐‐ ‐‐‐

Dimethylphenol, 2,4‐ 6.36E‐06 7.21E‐10 6.36E‐06 ‐‐‐ ‐‐‐

Di‐n‐butyl phthalate 6.95E‐07 8.16E‐09 7.03E‐07 ‐‐‐ ‐‐‐

Dinitrophenol 2,4‐ 3.60E‐05 5.56E‐09 3.60E‐05 ‐‐‐ ‐‐‐

Dinitrotoluene 2,4‐ 2.72E‐05 3.83E‐09 2.72E‐05 1.77E‐08 1.43E‐12 1.77E‐08

Di‐n‐octyl phthalate 6.50E‐33 8.14E‐10 8.14E‐10 ‐‐‐ ‐‐‐

Dioxane 1,4‐ ‐‐‐ ‐‐‐ 5.63E‐07 4.88E‐13 5.63E‐07

Ethylbenzene 1.44E‐05 2.85E‐09 1.44E‐05 ‐‐‐ ‐‐‐

Ethylene dibromide (1,2‐Dibrom 1.72E‐06 1.79E‐10 1.72E‐06 7.16E‐09 7.47E‐13 7.16E‐09

Fluoranthene 6.03E‐06 5.10E‐06 1.11E‐05 ‐‐‐ ‐‐‐

Fluorene 6.09E‐05 1.57E‐06 6.25E‐05 ‐‐‐ ‐‐‐

Indeno (1,2,3‐cd) pyrene ‐‐‐ ‐‐‐ 1.51E‐19 8.06E‐10 8.06E‐10

Lead ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐

Mercury (Fish Pathway Only) ‐‐‐ 2.01E‐02 ‐‐‐ ‐‐‐

Mercury (Total) 2.42E‐05 1.33E‐07 2.43E‐05 ‐‐‐ ‐‐‐

Methyl ethyl ketone 1.77E‐06 3.38E‐11 1.77E‐06 ‐‐‐ ‐‐‐

Naphthalene 5.36E‐03 2.69E‐06 5.36E‐03 7.37E‐07 4.49E‐11 7.37E‐07

Nickel 3.59E‐04 2.43E‐06 3.61E‐04 ‐‐‐ 2.16E‐10 2.16E‐10

Nitrobenzene 9.57E‐05 9.08E‐09 9.57E‐05 ‐‐‐ ‐‐‐

Nitrophenol 4‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐

Phenanthrene ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐

Phenol 5.86E‐07 4.19E‐11 5.86E‐07 ‐‐‐ ‐‐‐

Pyrene 3.34E‐06 7.27E‐06 1.06E‐05 ‐‐‐ ‐‐‐

Pyridine 9.99E‐05 2.61E‐09 9.99E‐05 ‐‐‐ ‐‐‐

Selenium 1.52E‐03 7.35E‐06 1.53E‐03 ‐‐‐ ‐‐‐

Silver 2.23E‐05 8.19E‐09 2.23E‐05 ‐‐‐ ‐‐‐

Styrene 7.79E‐06 1.76E‐11 7.79E‐06 ‐‐‐ ‐‐‐

Tetrachloroethylene 1.95E‐04 5.64E‐09 1.95E‐04 2.02E‐07 9.86E‐12 2.02E‐07

Toluene 2.00E‐05 1.71E‐09 2.00E‐05 ‐‐‐ ‐‐‐

Trichloroethane 1,1,1‐ 3.12E‐10 7.16E‐12 3.19E‐10 ‐‐‐ ‐‐‐

Trichloroethylene (Trichloroethy 4.03E‐03 3.27E‐09 4.03E‐03 8.12E‐09 1.16E‐14 8.12E‐09

Vanadium 7.51E‐04 4.90E‐07 7.51E‐04 ‐‐‐ ‐‐‐

Xylenes (total) 2.50E‐04 2.66E‐08 2.50E‐04 ‐‐‐ ‐‐‐

Zinc 3.01E‐05 2.12E‐05 5.13E‐05 ‐‐‐ ‐‐‐

total risk excluding ND 3.75E‐02 1.65E‐04 3.76E‐02 6.21E‐06 1.14E‐07 6.32E‐06

total risk including 1/2 ND 3.80E‐02 1.65E‐04 3.82E‐02 6.55E‐06 1.14E‐07 6.66E‐06