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3 <br /> Table 1. Summary of Detected Constituents From Extraction System, ARCO Station 2133, Stockton <br /> , <br /> i <br /> EPA 625 <br /> TPH/gas and volatile organics, pg/l (extractable <br /> EPA Method 8015/8020 EPA 624 (purgeable orgamcs, )1g/1 organics), pg/1 <br /> Date TPH as 1 Copper, lead, Zwc, <br /> sampled Benzene Ethylbenzene Toluene Xylenes gas Benzene Ethylbenzene Toluene Xylenes Naphthalene mg/l mg/l mg/1 <br /> 4/18/91 590 74 150 290 3,100 0 021 <0 05 012 <br /> 4/30/91 440 27 160 290 13 <br /> 6/11/91 190 22 120 110 1,300 <br /> 626/'91 48 38 18 23 280 011 0 050 024 <br /> 7/10/91 30 24 15 22 300 <br /> 7/24/91 37 22 19 27 370 j 003 0 010 010 <br /> 8/7/91 35 10 12 19 <50 <br /> 8/21/91 56 3 8 26 47 280 014 0 079 14 <br /> 9/11/91 12 <0 5 20 <0 5 X50 s <br /> 9/15/91 31 05 12 20 170 Oil 0 057 026 <br /> 10/9/91 25 06 88 15 150 <br /> 10/23/91 24 17 81 15 130 1 1 058 0 056 042 <br /> 11/6/91 14 <0 5 <d 5 2 8 <50 ' <br /> 1/8/92 67 15 36 100 930 73 13 33 100 <1 6 <0 02 <0 002 0 037 <br /> 1/22/92 74 11 27 71 840 <br /> 2/12/92 15 <0 5 09 <0 5 <50 <0 02 0.027 006 <br /> 2/26/92 32 17 38 110 1,300 <br /> 3/11/92 100 5 5 35 160 1,600 ' 001 <0 05 003 <br /> 3/25/92 100 17 47 140 1,300 <br /> 4/8/92 92 22 65 140 1,500 i 00073 <0 025 0 023 <br /> 4/22/92 97 13 48 110 1,000 <br /> 6/1/92a <0 3 <0 3 <0 3 _ <0 3 <30 h <br /> 6/10/92 75 8 0 24 56 560 0 019 <0 005 0 032 <br /> 6/24/92 100 94 33 100 940 ' <0 01 <br /> 7/8/92 32 08 32 33 380 <01 0 023 <br /> 7/22/92 22 <0.50 43 14 180 <br /> 8/12/92 094 054 <0 50 12 170 <0 010 <0 10 018 <br /> aSample was collected withm 1/2-hour of system start-up and is most likely not a representative sample <br /> f <br /> , <br /> 6673�C0PJ=P%TABL 1 <br />