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TABLE 5 HISTORIC RESULTS FOR SOIL SAMPLES COLLECTED DURING PREVIOUS INVESTIGATIONS-BTEX PG&E Former Tracy MGP Site Tracy, California c d y y = N y C Previous Sample Depth Sample c ) d Sample ID Location m c >, Investigation Matrix (feet bgs) Date m s X Lu mg/kg mg/kg mg/kg mg/kg B1-1-1 CUST A3 Soil 6.5 11/18/1986 ND<1.60 ND<1.60 ND<0.12 ND<0.30 B1-2-1 CUST A3 Soil 9.5 11/18/1986 4.80 7.40 7.40 12.0 B1-3-1 CUST A3 Soil 13.5 11/18/1986 ND<1.60 ND<1.60 ND<0.12 ND<0.30 B2-2-1 CUST A3 Soil 9.5 11/18/1986 ND<1.60 ND<1.60 ND<0.12 ND<0.30 B2-3-1 CUST A3 Soil 15.5 11/18/1986 ND<1.60 ND<1.60 ND<0.12 ND<0.30 OW-1 CUST A2 Soil 7-7.5 12/22/1987 ND<0.50 ND<0.50 ND<0.50 ND<0.30 OW-1 CUST A2 Soil 8.5-9 12/22/1987 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-2 CUST A3 Soil 6.5-7 1/4/1988 5.00 4.00 10.0 20.0 OW-2 CUST A3 Soil 8-8.5 1/4/1988 16.0 17.0 45.0 83.0 OW-2 CUST A3 Soil 9.5-10 1/4/1988 ND<0.50 ND<0.50 2.00 3.00 OW-2 CUST A3 Soil 15.5-16 1/4/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-3 CUST B3 Soil 8.5-9 1/4/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-3 CUST B3 Soil 11-11.5 1/4/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-4 CUST A3 Soil 7-7.5 12/22/1987 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-4 CUST A3 Soil 10-10.5 12/22/1987 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-5 CUST A2 Soil 6.5-7 2/18/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-5 CUST A2 Soil 9-9.5 2/18/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-6 CUST A3 Soil 6.5-7 2/18/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 OW-6 CUST A3 Soil 9-9.5 2/18/1988 ND<0.50 ND<0.50 ND<0.50 ND<0.50 TB-A-1 SI Al Soil 2-2.5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-A-2 SI Al Soil 3.5-4 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-A-3 SI Al Soil 5-5.5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-1-1 SI A3 Soil 2-2.5 10/28/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-1-2 SI A3 Soil 3.5-4 10/28/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-1-3 SI A3 Soil 5-5.5 10/28/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-2-1 SI A2 Soil 2-2.5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-3-1 SI A2 Soil 2-2.5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-6-1 SI Al Soil 2-2.5 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-7-1 SI A2 Soil 2.5-3 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-8-1 SI A3 Soil 2.5-3 11/2/1988 0.023 0.175 0.069 0.083 TB-8-2 SI A3 Soil 3.5-4 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-8-4 SI A3 Soil 7.5-8 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-9-2 SI B3 Soil 3.5-4 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-10-1 SI B3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-10-1` SI B3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-11-1 SI B2 Soil 2-2.5 11/1/1988 ND<0.001 0.008 ND<0.001 ND<0.001 TB-12-1 SI B1 Soil 2-2.5 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-13-1 SI B1 Soil 2-2.5 10/27/1988 ND<0.001 0.012 ND<0.001 ND<0.001 TB-13-1` SI B1 Soil 2-2.5 10/27/1988 ND<0.001 0.013 ND<0.001 ND<0.001 TB-13-2 SI B1 Soil 3.5-4 10/27/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-13-3 SI B1 Soil 4.5-5 10/27/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-15-1 SI C1 Soil 2-2.5 11/1/1988 ND<0.001 0.007 ND<0.001 ND<0.001 TB-15-2 SI Cl Soil 3.5-4.5 11/1/1988 NA NA NA NA TB-16-1 SI D1 Soil 2-2.5 10/26/1988 ND<0.001 0.030 ND<0.001 ND<0.001 TB-16-3 SI D1 Soil 4.5-5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-17-1 SI D1 Soil 2-2.5 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-17-2 SI D1 Soil 4.5-5 11/1/1988 NA NA NA NA Page 1 of 2