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TABLE 5 HISTORIC RESULTS FOR SOIL SAMPLES COLLECTED DURING PREVIOUS INVESTIGATIONS-BTEX PG&E Former Tracy MGP Site Tracy,California d c C N N Previous Sample Depth Sample c d Sample ID Investigation Location Matrix (feet bgs) Date m r X W mg/kg mg/kg mg/kg mg/kg TB-18-1 SI D1 Soil 2-2.5 11/2/1988 ND,0.001 ND<0.001 ND<0.001 ND<0.001 TB-19-1 SI E1 Soil 2-2.5 10/28/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-19-2 SI E1 Soil 4.5-5 10/28/1988 NA NA NA NA TB-20-1 SI E1 Soil 2.5-3 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-21-1 SI E1 Soil 2.5-3 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-21-3 SI E1 I Soil 4.5-5 11/1/1988 NA I NA NA NA TB-21-4 SI E1 Soil 7.5-8 11/1/1988 NA NA NA NA TB-22-1 SI E2 Soil 2-2.5 10/31/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-22-4 SI E2 Soil 7.5-8 10/31/1988 NA NA NA NA TB-24-1 SI E3 Soil 3-3.5 10/31/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-24-3 SI E3 Soil 7.5-8 10/31/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-24-4 SI E3 Soil 10.5-11 10/31/1988 0.005 1 0.037 0.014 0.230 TB-25-1 SI D3 Soil 2-2.5 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-26-1 SI D3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-26-2 SI D3 Soil 5-5.5 11/3/1988 NA NA NA NA TB-27-1 SI C3 Soil 2-2.5 11/2/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-28-1 SI C3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-28-2 SI C3 Soil 3.5-4 11/3/1988 NA NA NA NA TB-29-1 SI C2 Soil 2-2.5 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-29-2 SI C2 Soil 3.5-4 11/1/1988 NA NA NA NA TB-30-2 SI D2 Soil 3.5-4 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-31-1 SI E2 Soil 2-2.5 11/1/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-32-1 SI A3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-32-2 SI A3 Soil 3.5-4 11/3/1988 0.013 0.005 0.004 0.013 TB-32-4 SI A3 Soil 7.5-8 11/3/1988 0.540 8.64 3.77 13.9 TB-32-5 SI A3 Soil 10.5-11 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-32-6 SI A3 Soil 16-16.5 11/3/1988 ND<0.001 0.025 0.012 0.045 TB-33-1 SI C3 Soil 2-2.5 11/3/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TB-33-2 SI C3 Soil 3.5-4 11/3/1988 NA NA NA NA TW-1-1 SI E2 Soil 2-3 10/25/1988 1 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TW-2-1 SI C1 Soil 2-2.5 10/25/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 TW-2-2 SI C1 Soil 3.5-4.5 10/25/1988 NA NA NA NA TW-3-1 SI Al Soil 2-2.5 10/26/1988 ND<0.001 ND<0.001 ND<0.001 ND<0.001 = Duplicate Sample BTEX=Benzene,Toluene, Ethylbenzene and Xylenes CUST=Characterization of the Tracy Service Center Underground Storage Tank, (PG&E,June 27, 1988) SI =Site Investigation for the Tracy Manufactured Gas Plant Site(PG&E,April 1989) Values in BOLD text are detected concentrations above the reporting limit NA=Not Analyzed ND< =Non Detect at Reporting Limit mg/kg =milligrams per kilogram Page 2 of 2