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�s 4 Table 3 Groundwater Sample Analytical Results 1717 South Center Street Stockton, California / Monitoring Date Benzene Toluene Ethyl benzene I Xylenes I TPHg TBA I MTBE DIPS ETBE TAME Well Concentrations in Micro rams per Liter MW-1 07/19/1999 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) NA NA NA NA NA 06/29/2000 150 430 50 260 1,300 ND(20) ND(5) ND(5) ND(5) ND(5) 10/1121/2000 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 01/16/2001 ND(0 5) 15 052 29 ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 04/18/2001 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 07/25/2001 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) '} 03/28/2002 ND(0 5) ND(0 5) ND(0 5) 061 ND(50) ND(50) ND(5) ND(5) ND(5) ND(5) MW-2 07/19/1999 20,000 38,000 2,800 15,000 120,000 NA NA NA NA NA 06/29/2000 15,000 22,000 2,100 11,000 70,000 110 92 84 ND(5) ND(5) 10/12/2000 15,000 24,000 4,000 23,000 130,000 180 20 75 ND(5) ND(5) 01/16/2001 16,000 31,000 3,500 18,000 110,000 95 15 11 ND(5) ND(5) 04/18/2001 14,000 25,000 3,000 16,000 98,000 45 66 71 ND(5) ND(5) ' 07/25/2001 13,000 28,000 3,200 17,000 91,000 48 13 87 ND(5) ND(5) 03/28/2002 16,000 38,000 6,400 35,000 75,000 ND(50) ND(5) ND(5) ND(5) ND(5) MW-3 07/19/1999 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) NA NA NA NA NA 06/29/2000 170 510 64 320 1,600 ND(20) ND(5) ND(5) ND(5) ND(5) 10/12/2000 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 01/16/2001 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) ' 04/1812001 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 07/25/2001 ND(0 5) 12 ND(0 5) 1 1 ND(50) ND(20) ND(5) ND(5) ND(5) ND(5) 03/28/2002 07 25 076 48 ND(50) ND(50) ND(5) ND(5) ND(5) ND(5) 1 MW-4 03/28/2002 ND(0 5) 087 ND(0 5) 1 ND(50) ND(50) ND(5) ND(5) ND(5) ND(5) PH-6 03/15/2002 210 15 28 18 1,000 ND(2) 38 ND(0 5) ND(0 5) ND(0 5) ' PH-7 03/15/2002 51 27 110 130 4,900 ND(2) ND(0 5) ND(0 5) ND(0 5) ND(0 5) PH-8 03/15/2002 ND(0 5) 078 ND(0 5) 058 ND(50) 41 28 ND(0 5) ND(0 5) ND(0 5) 4 { i I TPHg =Total Petroleum Hydrocarbons as Gasoline TBA=Tert Butanol MTBE=Methyl tert butyl Ether DIPE= Di isopropyl Ether ETBE= Ethyl tert butyl Ether TAME=Tent Amylmethyl Ether NA= Sample Not Analyzed for this Compound ND= Not Detected at or Above the Laboratory Method Detection Limit Shown in Parentheses PH groundwater samples collected from temporary Geoprobe-driven borings 1 env/62400132/121382eg/projects/stockcent/gwelev/sheet2