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GROUNDWATER ELEVATIONS AND WATER SAMPLE ANALYSIS Olivarez Property 300 South California Street 0 Stockton, CA Updated: 07/19/99 SAMPLE ANALYSIS RESULTS BTEX BY EPA METHOD 602 & TPHg BY EPA METHOD 503018015(M) WELL SAMPLE DTW TOCE GWE B T E X TPHg I. D. DATE IN FT. IN FT. IN FT. ppb ppb ppb ppb ppb MW-1 July 19, 1999 29.06 98.02 68.96 5680 12900 1360 6870 71100 MW-1 December 29, 1998 30.56 98.02 67.46 29800 30900 3110 16200 197000 MW-1 January 24, 1997 38.14 98.02 59.88 15400 27600 3440 16800 162000 MW-1 July 3, 1996 39.93 98.02 58.09 12300 23600 6980 33500 460000 MW-1 May 1, 1995 47.26 98.02 50.76 7600 6000 2700 16000 64000 MW-1R July 19, 1999 28.59 5750 11700 1310 7190 6760 MW-2 July 19, 1999 28.91 98.03 69-12 3870 8790 2160 12500 71100 MW-2 December 29, 1998 30.38 98.03 67.65 2370 6600 4470 23300 9990 MW-2 January 24, 1997 38.11 98.03 59.92 14000 30000 2600 15200 143000 MW-2 July 3, 1996 39.79 98.03 58.24 16200 31500 2910 18300 199000 MW-2 May 1, 1995 47.14 98.03 50.89 18000 29000 3300 21000 120000 MW-213 July 19, 1999 28.51 928 3830 1850 12900 T0400 MW-3 July 19, 1999 28.19 97.4 69.21 7 ND ND 1 IVCD MW-3 December 29, 1998 29.65 97.4 67.75 9 ND 0.4 0.7 80 MW-3 January 24, 1997 38.2 97.4 592 238 314 28 280 2343 MW-3 July 3, 1996 38.91 97.4 58.49 430 7 <1.5 115 1920 MW-3 May, 1, 1995 45.87 97.4 51.53. 1300 36 6 450 5100 W-3R July 19, 1999 27.9724 0.7 ND 1 227 ANALYSIS FOR OXYGENATES BY GC/MS, (8260M) WELL METHYL-T- DI-ISOPROPYL ETHYL T-BUTYL TERT-BUTYL T-AMYL METHYL I.D. DATE SAMPLED BUTYL ETHER ETHER EHTER ALCOHOL ETHER MW-1 July 19, 1999 43 ND ND ND ND MW-1 December 29, 1998 330 ND ND 480 ND MW-1 R July 19, 1999 75 ND ND 180 130 MW-2 July 19, 1999 83 ND ND ND ND MW-2 December 29, 1998 ND ND ND ND ND MW-2R July 19, 1999 13 ND ND ND ND MW-3 July 19, 1999 ND ND ND ND ND MW-3 December 29, 1998 ND ND ND ND ND MW-3R July 19, 1999 ND ND ND ND ND i