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s a Table 4 Groundwater Sample Analytical Results The Earthgralns Company 2651 South Airport Way, Stockton, California October 2004 Sample Date Concentration u ID TPH-G Benzene Toluene Eth (benzene Xylene TBA MTBE DIPE ETBE TAME 1,2-DCA MW-1 10/11/2004 12 000 180 57 290 1,700 NQ 100 ND 10 ND 20 ND 10 NQ 10 NQ 10 MW-5 10/7/2004 ND(50) ND05 NDO5 NQO5 ND05 ND50ND05 Ng10 ND05 ND05 088 MW-7 10/7/2004 1 200 32 ND(2 5 ND(25) 3_9 ND 10 ND(11 0 49 ND(I 0 ND(l 0 15 MW-8 10/7/2004 ND 50 ND(O 5 ND(O 5 ND(O 5 ND 0 5 ND 5 0 ND(O S ND(11 0 ND(O 5 ND(O 5 83 MW-10 10/7/2004 ND 50 ND(O 5 ND(O 5 ND(O 5 ND(O 5 ND 5 0 ND(O 5 ND(1 0 ND(O 5 ND(O 5 091 MW-11 10/7/2004 690 23 18 ND(0 5 7 4 ND 5 0 ND(O 5 ND(I 0 ND(O 5 ND(O 5 ND(0 5 MW-12 10/7/2004 160 19 ND(0 5 075 ND(O 5 ND 5 0 ND(O 5 ND(l 0 ND(0 5 ND(0 5 24 SP-1 10/11/2004 20,000 1700 200 660 2 700 ND 50 ND 0 61 ND(5 0 ND(5 0 ND(5 D SP-2 10/8/2004 1,200 ND25 68 61 ND25 ND( ND25 ND50 ND25 ND25 ND25- SP-3 10/8/2004 NQ 50 ND(O 5 ND(O 5 ND(O 5 ND(O 5 ND(5 0 ND(O 5 ND(l 0 ND(O 5 ND(O 5 ND(O 5 SP-4 10/7/2004 240 23 ND(O 5 0 77 ND(O 5 ND(5 0 ND(O 5 ND(1 0 ND(O 5 ND(O 5 ND(O 5 SP-5 10/7/2004 ND(50) NDOS ND(05) NDO5 ND05 ND50 ND05 ND10 NDOS ND05 17 - SP-6 10/7/2004 270 39 ND(O 5 061 ND(O 5 ND(5 0 ND(O 5 ND(1 0 ND(O S ND(O 5 ND(O 5 PZ-1 10/8/2004 1 12,000 1 1,800 21 610 400 ND(130) N D i NgMW ND(13) ND(13) ND(13) PZ-2 10/8/2004 9400 110 ND 1O 61 180 ND 100 ND 10 ND 20 ND 10 ND 10 ND 10 Notes uglL-Results reported in micrograms per liter' ND-Not detected at or above the laboratory detection limit shown in parentheses U)77 j NA-Not Analyzed TPH-G Total Petroleum Hydrocarbons Gasoline TBA Tertiary Butyl Alcohol MTBE-Methyl Tertiary Butyl Ether DIPE-Di isopropyl Ether ETBE-Ethyl Tertiary Butyl Ether TAME-Tertiary Amyl Methyl Ether Oxygenate detection limits elevated due to gasoline interference 1,2 DCA=1,2-Dichloroethane env 1 62400132/121382eg!Investigation and Quarterly Reports I Historic TPH+BTEX Results XLS I Oct 2004