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am Im IM low I low , Go Table 4-3 Analytical Results of Groundwater Samples Collected at ARCO CQ Staaon 2093,Tracy,California Aromatic volatile organics(BETX),ppb TPH,ppm Sample Date Ethyl- 1,2- Number sam led Benzene benzeneToluene X lene T'pg Gasle a Diesel Motor oil Total :chloroethane range range lead m b DHS levels (a) I (a) 680(a) 100(b) 1750(a) (c) (c) (c) (c) (d) 0 5(a) ATR4 4/23/87 3000 <10 200 950 21 21 <10 <10 004 12122/87 5300 430 310 270 3/24188 5800 930 320 740 6 6 <0 5 <0 5 <01 6/23/88 237 2 88 10 52 52 <0 2 <0 2 <01 9/29/88 1430 350 115 130 14 14 <10 <10 <0I 2/22/89 1300 54 82 170 22 22 <01 <0I 6/29/89 590 97 38 220 13 (e) (e) (e) 9/18/89 280 49 13 100 063 (e) (e) (e) - 12/28/89 500 56 25 0 9 160 13 (e) (e) 4/18/90 150 35 5 1 63 044 044 _ (e_) - <2 10/16/90 150 26 <2 41 0,38 038 - <2 <0.5 ATR-5- 3/10/89 693 327 <5 0 7 66 66 <0 2 <0 2 6/2989 490 280 24 13 22 (e) (e) (e) - - 9/18/89 68 63 11 58 1 (e) (e) - - 12/27/89 94 150 2 <1 22 (e) - <0 5 4/18/90 120 68 26 140 19 19 (e} (e) - <2 10/16/90 18 79 4.7 16 1 1 - _ - <0 5 ATR-6 3/10/89 <0 5 <0 5 <0 5 <0 5 <0 2 <0 2 <0 2 <0 2 6/2189 <0 3 <0 3 <0 3 03 <0 05 (e) (e) 9/18/89 05 03 13 38 <0 05 (e) - I2/27/89 <0 3 <0 3 <0 3 04 <0 05 (e) (e) (e} <0 5 (e) (e) (e) 4/18/90 19 06 24 - <0 5 10/16/90 <0.5 <0.5 <0.5 <O.5 <0 Q5 - - <0 5 ATR-7 3110189 <0 5 <0 5 <0 5 17 <0 2 <0 2 <0 2 <0 2 6/2189 1 06 <0 3 05 <0 05 (e) (e) (e) -_ 9/18/89 04 <0 3 <0 3 11 <0 05 (e) (e) 12/27/89 10 27 09 79 009 (e) - <0 5 4/18/90 61 2 1 {e) {e) (e} - <0 5 10/16/90 <0.5 <OS OS OS <0 05 <0.05 <0 05 <O.OS <0 5 - <O.5 ATR-9 1 10/16/90 <05 I <0.5 I <0 5 1 <05 I <0 05 i <0 05 <0 05 <0 OS <05