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Table 1: Summary Table Analytical Results from Initial and Secondary Sampling <br /> W <br /> W U <br /> Q U 2 U ^ Win 2 ^ D <br /> W J W z—a, a wrn � °' Qrn ao' <br /> a a a O o f a E z E > E <br /> CO Q J v > — U <br /> N U) (n (n � <br /> Total Threshold Limit Concentration (TTLC) 500 2,400 <br /> Soluble Threshold Limit Concentration (STLC)mg/L 5 24 <br /> San Francisco Bay RWQCB ESL Direct Exposure Soil Screening Levels 10 -- <br /> Construction Worker Scenario(2016) <br /> United States Envionmental Protection Agency Risk-Based Screening <br /> Table, Composite Worker Soil, Carncinogenic Target Risk, Dermal SL 17 -- <br /> (2015) <br /> 4/16/2018 1032 COL1-1 A 0-6 in. 7.6 31 <br /> COL1-1 B 1-2 ft. 6.4 33 <br /> 4/16/2018 1034 <br /> 4/16/2018 1115 COL1-2 A 0-6 in. 7.2 28 <br /> 4/16/2018 1117 COL1-2 B 1-2 ft. 13 24 <br /> 4/16/2018 1124 COL1-3 A 0-6 in. 8.7 23 <br /> 4/16/2018 1126 COL1-3 B 1-2 ft. 6.8 34 <br /> 4/16/2018 1127 COL1-4 A 0-6 in. 14 34 <br /> 4/16/2018 1129 COL1-4 B 1-2 ft. 8.1 33 <br /> 4/16/2018 1143 COL1-5 A 0-6 in. 7.5 30 <br /> 4/16/2018 1145 COL1-5 B 1-2 ft. 3.9 32 <br /> 4/16/2018 1146 COL1-6 A 0-6 in. 6.0 25 <br /> 4/16/2018 1148 COL1-6 B 1-2 ft. 3.6 31 <br /> 4/16/2018 1152 COL1-7 A 0-6 in. 7.3 25 <br /> 4/16/2018 1154 COL1-7 B 1-2 ft. 8.2 29 <br /> 4/16/2018 1200 COL1-8 A 0-6 in. 7.9 28 <br /> 4/16/2018 1202 COL1-8 B 1-2 ft. 5.6 31 <br /> 4/16/2018 1207 COL1-9 A 0-6 in. 15 32 <br /> 4/16/2018 1209 COL1-9 B 1-2 ft. 5.9 29 <br /> 4/16/2018 1215 COL1-10 A 0-6 in. 7.7 24 <br /> 4/16/2018 1217 COL1-10 B 1-2 ft. 2.6 29 <br /> 4/16/2018 1219 COL1-11 A 0-6 in. 6.2 25 <br /> 4/16/2018 1221 COL1-11 B 1-2 ft. 3 26 <br /> 4/16/2018 1231 COL1-12 A 0-6 in. 13 31 <br /> 4/16/2018 1233 COL1-12 B 1-2 ft. 8.5 29 <br /> 4/16/2018 1511 COL2-1 A 0-6 in. 8.3 29 <br />