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Former Unocal Service Station 15098 5606 Pacific Avenue Stockton California TABLE 1 SUMMARY OF LABORATORY ANALYSES ' PIT SAMPLES (Collected by Kaprealian Engineering, Inc. ) Sample Depth TPH as Ethyl- Date (feet) Gasoline Benzene Toluene benzene Xylenes 8010 9/30/88 PB1 43 <1.0 <0. 1 <0. 1 <0.1 <0.1 ND 9/30/88 PB2 43 <1.0 <0. 1 <0.1 <0.1 <0.1 ND 10/20/88 PB3 45 45 6. 6 9.5 1.5 6.7 0.210** 1/03/88 PB3 (50) 50 1.5 0.3 <0. 1 <0.1 0. 1 0/20/88 PB4 45 100 15 37 3.8 12 0.250*** 0.280** 11/03/88 PB4 (50) 50 1.3 0.4 <0. 1 <0. 1 0.2 0/21/88 PB5 47 280 29 54 8.7 48 0.170*** 0.910** 10/21/88 PB6* 50 740 52 52 30 130 0.800*** 19/30/88 S1 33 4 .8 <0. 1 0. 120 <0. 1 2.4 1 ND ** 9/30/88 SlA 42 <1.0 <0. 1 <0. 1 <0. 1 <0. 1 ND &/30/88 21/88 SW1B 43 <1. 0 <0. 1 <0.1 <0. 1 <0.1 ND 30/88 S2 43 <1. 0 <0. 1 <0. 1 <0. 1 <0. 1 ND S3 42 <1. 0 <0. 1 <0. 1 <0.1 <0. 1 ND 10/21/88 SW4 45 360 24 24 9.5 39 0. 076*** 11/12/88 SW4 (53) 53 280 2 . 4 12 39 42 ND.250** 11/15/88 SW4A(53) 53 24 4 . 1 3 .5 1. 0 4 . 1 ND 0/21/88 SW5 45 39 6 .3 10 0.8 3 . 7 0.200*** 11/12/88 SW5(53) 53 175 1.3 7 .7 3 . 9 33 0. ND ** 01/15/88 SW5A(53) 53 13 2 . 6 1. 1 0.4 1. 6 ND 0/20/88 SW6 43 38 5.8 7 .2 1. 3 6.9 0. 130** 1/03/88 SW6(50) 50 1 . 6 <0. 1 <0.1 <0. 1 1. 2 ND 1.0/20/88 SW7 42 .5 14 2 .4 3 . 0 0. 4 2 . 5 0. 190** 11/03/88 SW7(50) 50 16 3 . 0 3 . 3 0. 7 5. 3 0. 120** 0/20/88 SW8 41. 5 4 . 4 1.7 <0. 1 <0. 1 1. 3 ND 10/20/88 SWSA 42 .5 2 . 0 0 . 6 <0. 1 0. 2 0. 6 ND 01/03/88 SW8 (50) 50 <1.0 <0. 1 <0.1 <0. 1 <0. 1 ND 1/11/88 SW9 53 4 .4 0.3 0.4 0. 1 0.8 ND 1/11/88 SW10 53 18 0. 7 0 .2 0. 4 1.4 ND ID o-- Non-detectable for all 8010 constituents. PB6 also analyzed for Total Lead (11 mg/kg) and Organic Lead (ND) . ** DCA (1,2-Dichloroethane, detection limit 0. 050 mg/kg) . F CEVE (2 ,Chloroethylvinyl Ether, detection limit 0. 050 mg/kg) . Indicates analysis was not performed. fmwm ults are in milligrams per kilogram (mg/kg) , unless otherwise indicated. S TBL