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Table A2. Concentration of polycyclic aromatic hydrocarbons in seven bottom-sediment core samples from Dillon ReseNoir, 1997 [<, less than; E, estimated value; DLN, Dillon Reservoir near the dam; DSU and DSL, upper and lower pmt of the Snake River arm; DBU and DBL, upper and lower part of Blue River arm; DTU and DTL, upper and lower part of Tenmile Creek arm. All concentrations are in micrograms per kilogram. The minimum laboratory reporting level is determined in part by the amount of material available for analysis; less material was analyzed from the core gathered near the dam (DLN)] Core Depth Naphtha- C1-128 2-ethylnaph- 2,G-di methyl- 1,G-dimethyl- C2-128 Acenaph- 1,2-dimethyl- Acenaph- C3-128 2,3,G-trimethyl- identifier (centimeters) lene isomers thalene naphthalene naphthalene isomers thylene naphthalene thene isomers naphthalene Minimum laboratory 10 10 10 10 10 10 10 10 10 10 10 reporting level DLN 0-2 E4.5 19.6 <10 32.6 E3.8 57.8 E3.8 <10 <10 33 <10 DLN 2-4 E6.5 32.5 E1.8 154 13.5 204 E5.1 <10 E1.5 78.1 E3.6 DLN 4-6 E5.1 37.2 <10 138 11.4 200 E3.4 E4.3 <10 57.5 E2.7 DLN 6-8 E5.4 20 <10 350 24.8 427 <10 <10 <10 66.8 E5.6 DLN 8-10 E5.1 19.8 <10 220 16 279 E4.7 <10 <10 40.6 E5.3 DLN 10-12 E5.8 29 <10 338 24.7 414 E5.3 E3.3 <10 65.4 E6.2 DLN 12-14 E5.2 30.2 <10 178 15.7 232 E5.0 EO.92 <10 52.7 E4.8 DLN 14-16 E4.4 40.5 E1.8 116 11.1 156 E3.3 <10 <10 48.8 E2.8 DLN 16-18 E3.8 32.9 E1.4 123 10.4 163 E3.3 88.2 ELl 64.6 E3.3 DLN 18-19 E4.3 36.2 E1.1 106 E9.5 156 <10 <10 <10 82.6 E3.2 Minimum laboratory 5 5 5 5 5 5 5 5 5 5 5 reporting level DBL 0-2 E2.8 10.6 <5 25.4 E5.0 50.1 7.1 <5 <5 23.6 E2.3 DBU 0-2 E3.5 11.4 EO.74 15.6 E3.2 44 6.3 <5 EO.84 21.3 E1.8 DTL 0-2 <5 11.5 <5 29.7 5.4 52.8 5.2 EO.48 <5 29.8 E1.9 DTU 0-2 E4.4 15.2 EO.94 27.8 5.1 52.8 5.2 ELl EO.95 30.8 E2.4 DSL 0-2 E3.7 13.9 <5 30.9 E3.9 52.4 5.8 <5 EO.62 17.3 E2.3 DSU 0-2 E4.0 16.4 E1.3 35.9 E3.6 61.1 6.5 EO.50 <5 24.2 E2.6 ,.. 'tl 'tl rn Z c >< N .....