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PITTMAN ELEMENTARY SCHOOL <br /> Risk and Hazard Summation <br /> From calculations based on the PEA Guidance <br /> • Chemical Risk Hazard <br /> Barium I NC 1.89E-01 <br /> Be Ilium 15.69E-0811.15E-021 <br /> Cadmium 2.79E-07 1.01E-021 <br /> Chromium III NC 9.13E-04 <br /> Chromium VI 5.70E-06 2.82E-02 <br /> Cobalt 1.90E-0611.64E-01 <br /> Copper NC I 2.43E-02 <br /> Nickel 5.15E-07 5.36E-02 <br /> Vanadium NC 2.62E-01 <br /> Aldrin 4.40E-08 6.41 E-04 <br /> alpha-BHC 5.21E-09 2.98E-05 <br /> beta-BHC I 2.86E-09 7.36E-05 <br /> delta-BHC' 1.21 E-081 NC <br /> amma-BHC 13.58E-0918.38E-051 <br /> alpha-Chlordane" 3.63E-07 4.32E-03 <br /> Chlorobenzilate 8.00E-09 1.10E-05 <br /> DDD 3.49E-101 NC <br /> DDE 2.18E-081 NC <br /> DDT 4.29E-0811.97E-031 <br /> Dieldrin 4.30E-06 4.00E-02 <br /> Endosulfan II"' NC 2.22E-06 <br /> Endrin Aldeh de NC NC <br /> Endrin Ketone NC NC <br /> Heptachlor 13.11 E-08 1.13E-04 <br /> • Heptachlor E oxide 2.28E-07 2.37E-02 <br /> Methoxychlor NC 1.74E-05 <br /> Summation (soil) 1.35E-05 8.15E-01 <br /> From calculations based on the Johnson& Ettin er Model soil gas and roundwater) <br /> Chemical Risk I Hazard <br /> Acetone NC 8.00E-04 <br /> Benzene 2.80E-07 3.80E-04 <br /> 1,3-Butadiene 4.30E-06 2.90E-03 <br /> 2-Butanone (Methyl Ethyl Ketone) NC 3.70E-05 <br /> Carbon Disulfide NC 6.90E-06 <br /> Chloroform 3.40E-09 5.00E-06 <br /> 1,3-Dichlorobenzene NC 9.90E-06 <br /> 1,2-Dichloroethane 8.20E-08 2.30E-05 <br /> Ethyl Benzene NC 8.50E-06 <br /> Hexane NC 1.60E-04 <br /> Methyl tertiary-Butyl Ether 1.00E-08 3.00E-05 <br /> Methylene Chloride 1.00E-08 6.10E-05 <br /> Prop (benzene NC 1.40E-OS <br /> Tetrachloroethene 1.70E-07 1.90E-03 <br /> Toluene NC 1.80E-04 <br /> Trichloroethane 1.50E-09 2.90E-06 <br /> 1,1,1-TrichloroethaneNC 1.50E-05 <br /> 1,2,4-Trimeth (benzene NC 1.60E-03 <br /> 1,3,5-Trimeth (benzene NC 4.60E-04 <br /> m,p-X lene NC 3.10E-04 <br /> o-Xylene NC 1.20E-04 <br /> • Summation (soil gas and groundwater) I 4.86E-06 9.02E-03 <br /> Summation (soil, soil gas, and groundwater) I 1.84E-05 8.24E-01 <br /> NC= Not calculated due to lack of toxicity data <br /> risk summation.xls <br />