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Table 1. Summary of Detected Constituents From Extraction System, ARCO Station 2133, Stockton 4 TPH/gas and volatile organics, pg/l EPA 625 EPA Method 8015/8020 EPA 624 ur eable organics), (eatres), pg (P gP8n organics), }�g/1 Date TPH as Copper, Lead, Zinc, sampled Benzene Ethylbenzene Toluene Xylenes gas Benzene Ethylbenzene Toluene Xylenes Naphthalene mg/I mg/l mg/1 4/18/91 590 74 150 290 3,100 � 0 021 <0 05 012 4/30/91 440 27 160 290 13 6/11/91 190 22 120 110 1,300 6/26/91 48 38 18 23 280 ? Oil 0 050 024 7/10191 30 24 15 22 300 7/24/91 37 22 19 27 370 003 0 010 010 8/7/91 35 10 12 19 X50 8/21/91 56 38 26 47 280 014 0 079 14 9/11/91 12 <0 5 20 <0 5 <50 9/25/91 31 05 12 20 170 Oil 0 057 026 10/9/91 25 06 88 15 150 1 10/23/91 24 17 81 15 130 4I 058 0 056 042 11/6191 14 <0 5 <0 5 2 8 X50 ,f 1/8/92 67 15 36 100 930 73 13 33 100 <1 6 <0 02 <0 002 0 037 1/22/92 74 11 27 71 840 1 2/12/92 15 <0 5 09 <0 5 <50 <0 02 0 027 006 2/26/92 32 17 38 110 1,300 . 3/11/92 100 55 35 160 1,600 r 001 <0 05 003 3/25/92 100 17 47 140 1,300 4/8/92 92 22 65 140 1,500 00073 <0 025 0 023 4/22/92 97 13 48 110 1,000 6/1/92$ <0 3 <0 3 <0 3 <0 3 <30 � 6/10/92 75 80 24 56 560 0019 <0 005 0032 6/24/92 100 94 33 100 940 i <0 01 7/8/92 32 08 32 33 380 <0 1 0 023 7/22/92 22 <0 50 4 3 14 180 8/12/92 094 054 <0 50 12 170 <0 010 <0 10 018 8/26/92 8 6 044 1 1 9 5 150 9/9192 25 13 23 95 160 <0 010 <0 10 0 039 9/23/92 078 05 <0 S 34 100 � 0048 <0 10 1 7 10/14/92 <0 5 <0 5 <0 5 <0 5 <50 10/31/92 20 20 3 6 19 260 11/11/92 096 12 <0 5 12 160 0 011 <0 005 0 049 11/25/92 074 14 <0 5 16 170 12/16/92 <0 5 21 0 53 48 650 <0 01 <0 005 0 016 12/30/92 <0 5 15 057 65 700 1/13/93 57 2 3 088 73 760 0 011 <0 1 <0 01 1/27/93 14 <0 5 <0 5 170 1,400 1 • 2/10/93 190 22 63 210 1,600 0 031 'Sample was collected within 1/2-hour of system start-up and Is most likely not a representative sample 7452 r-0RRBSPN'AB I