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F SEP 1ISS9 ENVIRONMENTAL HEALTH A9,41 {{��yyY 1 S ""I 'S Table 1. Analytical Results of Groundwater Samples Collected at ARCO Station 20 9,4racy,California Aromatic volatile organics(BE X),ppb TPH,ppm Sample Date Ethyl- Gasoline Dicscl Motor oil Total Number sampled Benzene benzeneToluene Xylene TPH range range range lead ppm DHS action levels (a) 1 680 1,750 620 (b) (b) (b) (c) ATR-I 411387 <0.5 <0.5 <0.5 23 <0.1 <0.1 <0.1 <0.1 0.024 12/22/87 5.9 0.9 <0.5 <0.5 -- - - - -- 3/24/88 <0.5 <0.5 <0.5 <0.5 -- <0.2 <0.2 <0.2 <0.1 6/2388 <0.5 4.3 1.3 2.2 -- <02 <0.2 <0.2 <0.1 911988 <0.5 <0.5 <0.5 <0.5 -- <0.2 <0.2 <0.2 <(1.1 212289 1.4 <0.5 <0.5 1.8 <0.l <0.1 <0.1 <0.1 --(d) 6121/89 360 2.1 0.8 36 0.52 (e) (e) (e) - ATR-2 4123/87 <0.5 <0.5 0.6 <0.5 <0.1 <0.1 <0.1 <0.1 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 <0.1 6/23/88 <0.5 <0.5 <0.5 <0.5 -- <0.2 <0.2 <0.2 <0.1 9/2988 <0.5 <0.5 <0.5 <0.5 -- <1.0 <1.0 <1.0 <0.1 2122/89 1.8 0.6 0.7 3.4 0.37 0.37 <0.1 <0.1 --(d) 6121/89 1.9 0.4 <0.3 <0.3 <0.05 (e) (e) (e) - ATR-3 4/1387 2300 <5.0 180 2300 17 17 <0.i <0.1 0.1 12/2287 5000 530 50 250 - - - - -- 312488 8300 4400 8700 7800 43 43 <0.5 <0.5 <0.1 6/23/88 6160 1800 4221 4750 70 70 <0.2 <0.2 <0.I 9129/88 8850 2190 17600 8170 57.4 57.4 <1.0 <1.0 <0.1 2/22/89 1000 480 2100 2000 110 110 <0.1 <0.1 --(d) 6129/89 890 250 520 1100 4.5 (e) (e) (e) - ATR-4 4/23/87 3000 <10 200 950 21 21 <1.0 <1.0 0.04 12112/87 5300 430 310 270 -- - - - -- 3124/88 5800 930 320 740 6 6 <0.5 <0.5 <0.1 6/2388 237 2 8.8 10 5.2 5.2 <0.2 <0.2 <0.1 9/29/88 1430 350 115 130 1.4 1.4 <1.0 <1.0 <0.1 2122/89 1300 54 82 170 22 22 <0.1 <0.1 --(d) 6/29/89 590 97 38 220 1.3 (e) (e) (e) - ATR-5 3/10/89 693 327 <5.0 7 6.6 6.6 <0.2 <0.2 -- 6/.989 490 280 2.4 1.3 2.2 (e) (e) (e) -- ATR-6 3110/89 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 - 612189 <0.3 <0.3 <0.3 10.3 <0.05 (e) (e) (e) - ATR-7 3110/89 <0.5 <0.5 <0.5 1.7 <0.2 <0.2 <0.2 <0.2 - 612189 1 0.6 <0.3 0.5 <0.05 (e) (e) (e) (a)Drinking water action levels recommended by the Department of Health Services,April 1989. (b)No acton Ievel established (c)RWQCB primary drinking water standard(MCL)for lead,0.05 milligrams/liter. (d)Total lead was not tested because it has not been detected in any of the sampling intervals since March1987. (e)Hydrocarbons were not characterized- However,the hydrocarbons are within the low boiling point(C4-C 12)range.