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COAMA Table 1 Groundwater Extraction System Analytical Results,Shell-branded Service Station,2575 Country Club Boulevard Stockton California Influent Midfluent I Midlluent 2 Effluent _ Sample TPHg Benzene MTBE TPHg Benzene MTBE TPHg Benzene MTBE Mg Benzene MTBE TPH pH Date Conc Cone Cone Cone Cone Cone Cone Cone Conc Cone Cone Cone Cone (n:mlddl ) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) 05/31101 36 000 9 400 63 000 <50 <0 50 <0 50 1 <50 <0 50 <0 50 <50 <0 50 86 NS NS 0620101 3 000 650 2 800 <50 <0 50 <0 50 <50 <0 50 <0 50 120 15 loo NS 14S 06/25101 28 000 5 700 16000 <50 <0 50 <0 50 <50 <0 50 <0 50 <50 <0 50 <0 50 N5 NS 07/16101 34 000 9 800 61 000 <50 <0 50 <0 50 <50 <0 50 <0 50 <50 <0 50 063 VS NS 07!23101 23 000 4 600 33 000 <50 <0 50 <0 50 <50 <0 50 <0 50 <50 <0 50 060 NS NS 08/02/01 47 000 12 000 87 000 <50 <0 50 <0 50 <50 <0 50 <0 50 <50 <0 50 <0 50 NS NS 08no/0l 44,000 11 000 99 000 <50 0 69 <0 50 <50 <0 50 <0 50 <50 <0 50 <0 50 NS NS 09106/01 50 000 10 000 110000 <50 <0 50 <0 50 <50 <0 50 <0 50 <50 <0 50 <0 50 NS NS 0912 M 1 53 000 9 800 110 000 <50 <0 50 100 <50 <0 50 <0 50 <50 <0 50 <0 50 NS NS 10103/01 47 000 12 000 150 000 <50 <0 50 200 <50 <0 50 054 <50 <0 50 <0 50 NS NS 10/16/01 45 000 12 000 200 000 <50 0 53 540 <50 <0 50 <5 0 <50 <0 50 <5 0 INS NS 11A)8)01 <50 000 12 000 160 000 <50 <0 50 19 <50 <0 50 <5 0 <50 <0 50 <5 0 NS NS 11121/01 33 000 9 000 110 000 56 47 570 <50 <0 50 <5 0 <50 <0 50 <5 0 NS NS 12/12/01 120 000 9 700 120 000 130 63 150 <100 38 44 j <100 <0 30 <5 0 NS NS 12/28/01 33 000 8 600 98 000 <2 000 <20 7200 <50 <0 50 <50 <50 <0 50 <5 0 VS NS 01/26/02 55 000 9 300 91 000 <20 000 <200 120 000 110 <0 50 48 000 <50 <0 50 <5 0 NS ti S 02122/02 63 000 7 900 78 000 <50 <0 50 <5 0 <50 <0 50 150 <50 <0 50 30 NS VS 03)06/02 13 000 1 400 11 000 <50 <0 50 <5 0 <50 <0 50 61 I <50 <0 50 21 VS NS 03/27/02 NS NS NS NS NS NS NS NS NS <50 <050 NS VS NS 04/01/02 51 000 7 500 79 000 62 <0 50 48 000 <250 <25 <25 <50 <0 50 6 0 NS NS 04125102 44 000 7200 87 000 <50 <0 50 23 <50 <0 50 <5 0 <50 <0 50 <5 0 NS NS 05122/02 57 000 7 500 69 000 <50 <0 50 <50 <50 <0 50 <5 0 <50 <0 50 <5 0 NS NS 06/19/02 86 000 7 800 62 000 <5 000 <0 50 49 000 <50 <0 50 <5 0 <50 <0 50 <5 0 NS NS 06)26102 60 000 6 900 66 000 <10000 <100 70 000 <50 <0 50 <50 1 <50 <0 50 <5 0 NS NS 08117/02 NS NS NS NS NS NS I NS NS NS <50 <0 50 <0 50 09/24/02 31,000 4,400 33 000 <50 <0 50 <0 50 <50 <0 50 40 <50 <0 50 <0 50 <1 000 682 10/07/02 23 000 3 300 36 000 <50 <0 50 <0 50 <50 <0 50 41 NS NS NS NS NS I0122102 33,000 3,500 28 000 54 <0 50 6 600 <50 <0 50 4 7 <50 <0 50 <0 50 <1 000 679 11/07102 17 000 2,800 39 000 <2 500 <25 14 000 <50 <0 50 35 <50 <0 50 <0 50 <l 000 7 06 111 UM 26 000 6 800 58 000 <50 <0 50 11 000 <100 <1 0 3 2 NS NS l`S NS NS 12/04/02 25,000 3,100 23,000 93 <0 50 24,000 <50 <0 So 2 8 <50 <0 50 <0 50 <1,000 699 Abbreviations&Notes TPHg=Total purgeable hydrocarbons as gasoline MTBE=Methyl tent butyl ether Conc =Concentration Page I of 2 0783