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i TABLE 1 I ' GROUNDWATER DATA THRIFTY OIL STATION #171, STOCKTON,CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CA51NG GROUNDWATER SAMPLER TPH-g BENZENE TOLl3ENE EthYlBenzene XYLENE MTBE GROUNDWATER PItODiICT THICKNESS ELEVATION ELEVATION (�g/y) (U€1) (Ugll-) (feet) (feet) (feet) (feet) (feet) 02/13/96 9 000 2 500 12 22 140 --7-6024 NP 000 93 68 3344 05/14196 69,000 20 000 22 600 1900 9 400 50 72 NP 0 00 93 68 42 96 08!28196 84,000 16,000 19 000 1,500 8,700 *1 500 53 80 NP 000 93 68 39 88 11114!96 6,100 53 1900 <6 1,000 *1 200 5262 NP 000 93 68 4106 02/12/97 SAMPLES LOST 48 80 NP 000 93 68 44 88 05/14/97 <50 090 <0 3 <0 3 <0 5 *39 53 07 NP 000 93 68 40 61 08/13/97 64 12 074 <0 3 1 1 31 - 11/13/97 92,000 10,000 27,000 2 800 15,000 470 51 70 NP 000 93 68 4198 02/11/98 65,000 7,400 17,000 1 100 6,900 670 4920 NP 000 93 68 454S93 05/28/98 470 1 6 1 1 <0 3 24 460 5055 NP 000 93 68 43 13 08/12/98 190 <0 3 <0 3 <0 3 <0 5 390 4745 NP 000 93 68 4623 11/10/98 116 <0 3 <0 3 <0 3 <0 5 260 5275 NP 000 9369 4093 02/25/99 98 <0 3 <0 3 ---<0-3- <0 5 160 38 35 NP 000 15 11 -2324 05/14/99 4,000 <0 3 <0 3 <0 3 <0 5 7,200 4038 NP 000 15 11 -2527 08/18/99 <50 <0 3 <0 3 <0 3 <0 5 <20 39 06 NP 0 00 15 1 1 23 95 11/16199 59 000 3 900 11 000 1,000 8,900 1,000 41 26 NP 000 15 11 -26 15 02/09100 25 000 2,300 54 <30 3,400 420 4076 NP 000 15 11 25 65 05!17100 11,000 852 1,700 <6 1,400 415 41 90 NP 000 l5 k l 26 79 08/23/00 9,430 1,260 563 <0 2 1,670 884 4055 NP 000 15 11 -2544 11!15!00 <50 <0 3 <0 2 <0 2 <0 4 150 41 89 NP 000 15 11 2679 02/14/01 <50 <0 3 <0 2 <0 2 <0 4 149 4050 NP 000 15 11 -25 39 05/15/01 148 <0 3 <0 2 <0 2 <04 227 4050 NP 000 15 11 -25 39 08/15/01 98 <0 3 cp 2 <0 2 <0 4 171 41 51 NP 000 15 11 2640 11/06/01 293 69 88 8 43 137 46 10 NP 000 15 11 3099 02/13/02 30,800 1 160 719 1,060 6 360 71 4360 NP 000 15 11 -2949 05/07/02 15 700 13 84 <2 0 5,760 77 42 15 NP 000 15 11 -2704 08/07/02 <50 <0 08 <0 18 <0 17 <0 4 81 47 30 NP 000 15 11 32 19 11/13/02 155 <0 08 <0 18 <0 17 <0 4 44 4980 NP 000 15 11 -3469 02119!03 c 15 <0 22 <0 32 <0 31 <0 4 <0 18 49 79 NP 000 15 11 -3468 05/14/03 <15 <0 22 <0 32 <0 31 <0 4 <0 18 4484 NP 000 15 I 1 29 73 08112!03 19,900 1 770 473 194 2 550 60 4894 NP 000 15 11 -33 83 11/24/03 <15 <0 22 <0 32 <0 31 <0 4 80 50 63 NP 0 15 11 35 52 02/11/04 865 29 160 12 61 434 4735 NP 0 00 00 15 l 1 32 24 05/12/04 <15 <0 22 <0 32 <0 31 <0 4 84 466S NP 000 15 11 -31 57 08117!04 <15 <0 22 <0 32 2 3 3 <0 4 34 51 48 NP 000 1 15 11 -3637 171 TAB I AS Page 8 off 1 6131104