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Table 4-3 Analytical Results of Groundwater Samples Collected at ARCO Stat'on 2093,Tracy, California Aromatic volatile organics(BETX),ppb TPH,ppm Sample Date I Ethyl_ 11,2- Number sam led Benzene benzene Toluene Xylene Tpg Gaassoliene Diesel Motor oil Total ichioroethane range range lead vvm b DHS levels (a) 1 (a) 680(a) I00(b) 1750(a) (c) (c) (c) (c) (d) 0 5 (a) ATR-1 4/23/87 <0 5 <0 5 <0 5 23 <0 I <01 <0 I <01 0 024 1Z122/87 59 09 <0 5 <0 5 3/2488 <0 5 <0 5 <0 5 <0 5 -- <0 2 <0 2 <0 2 <01 6/2388 <0 5 43 13 22 -- <0 2 <0 2 <0 2 <01 9129188 <0 5 <0 5 <0 5 <0 5 <0 2 <0 2 <0 2 <01 2/22/89 14 <0 5 <0 5 18 <01 <0 I <0 I <0 I 6/21/89 360 21 08 36 052 (e) (e) (e) �- 9/1889 250 570 1200 7100 27 (e) (e) (e) -- <20 12/2789 34 13 <0 3 14 <0 05 (e) (e) (e) -- <0 5 4/18/90 21 16 15 16 013 013 10/16/90 1 2 <0.52 <OAS c0 OS <0 05 <0 05 - <0 5 -- <0 5 ATR-2 . 4/23/87 <0 5 <0 5 06 <0 5 <0 I <0 I <01 <01 0 018 12/2287 <0 5 <0 5 <0 5 <0 5 _ 3/2488 <0 5 <0 5 <0 5 <0 5 -- <0 5 <0 5 <0 5 <01 6/2388 <0 5 <0 5 <0 5 <0 5 -- <0 2 <0 2 <0 2 <01 - 9/2988 <0 5 <0 5 <0 5 <0 5 <10 <1 0 <10 <01 2122189 18 06 07 34 037 037 <01 <01 6/21/89 19 04 <0 3 <0 3 <0 05 (e) (e) (e) 9/18/89 19 11 09 82 0 009 (e) (e) (e) 16 12/2789 35 11 <0 3 03 <0 05 (e) (e) (e) _ 7 4/18/90 29 <0 3 <0 3 <0 3 005 005 _ 10/16/90 <0.5 <0.5 <0.5 <0.5 <0.05 <0 05 <0 05 <0. 62 05 62 ATR-3 4/23/87 2300 <5 0 180 2300 17 17 <01 <01 01 12/2287 5000 530 50 250 - 312488 8300 4400 8700 7800 43 43 <0 5 <0 5 <01 6/23/88 6160 1800 4221 4750 70 70 <0 2 <0 2 <01 9129/88 8850 2190 17600 8170 574 574 <10 <1 0 <0 I 2/22/89 1000 480 2100 2000 110 110 <01 <01 6129/89 890 250 520 1100 45 (e) (e) (e) 9/18/89 1000 460 1300 2200 74 (e) (e) (e) -- 19 12/2889 840 840 1400 5600 27 (e) (e) (e) -- <204/18/90 1000 340 490 1500 48 48 i 10/16/" 1900 780 300 46M 14 14 <10 <10