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mob <br /> 7ABTl <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION #171, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLED TPH-g BENZENE TOLUENE EthylBenzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> I <br /> (ug/L) ( 81-) (uB(L) 091 ) (ug L) (ug/L) (feet) (feet) (feet) (feet) (feet) <br /> 05/14/99 <50 <03 048 <03 <0 5 <20 4183 NP 000 15 08 -2675 <br /> 08/18/99 <50 <03 063 <0 3 <05 <20 39 15 NP 000 15 08 -2407 <br /> 11/16/99 460 0 84 060 <03 091 25 41 34 NP 000 1308 -2626 <br /> 02/09/00 <50 030 <03 <03 <05 <20 4183 NP 000 1508 -2675 <br /> 05/17/00 <50 <0 25 <0 25 <0 25 <05 101 41 83 NP 000 1508 -2675 <br /> 08/23/00 <50 <03 <02 <02 <04 15 4059 NP 000 15 08 -2551 <br /> MONITOWNG WELL#MW-4 <br /> 11/20/92 36,000 3,800 3,200 1 800 11,000 <br /> 03/31/93 31 000 2000 1,200 910 5 700 7006 NP 000 93 29 2323 <br /> 06/23/93 21 000 1 800 980 670 2,000 6790 NP 000 93 29 2539 <br /> 09/13/93 55 000 7 600 5 500 1 500 5,200 7025 NP 0 00 9329 2304 <br /> 12/13/93 40 000 2,600 2200 1,100 6,000 7095 NP 000 9329 2234 <br /> 03/08/94 14 000 350 200 190 810 65 50 NP 000 9329 2779 <br /> 06/07/94 5 700 440 110 52 280 63 05 NP 000 93 29 3024 <br /> 09/07/94 12 000 1 700 640 260 910 6628 NP 000 93 29 2701 <br /> 06/06/95 18 000 3,700 360 190 800 - _ - _ <br /> 08/16/95 1 100 1 900 87 ND 360 5944 NP 000 93 29 33 85 <br /> 11/13/95 16 000 2 600 3 900 230 1 300 5993 NP 000 93 29 33 36 <br /> 02/13/96 7,300 2 300 89 ND 160 5949 NP 000 9329 33 80 <br /> 05/14/96 14 000 6 000 200 350 470 4964 NP 000 9329 4365 <br /> 08/28/96 5 400 2 400 53 23 28 *<200 52 40 NP 000 93 29 4089 <br /> 11/14/96 <50 <0 3 <03 <03 <05 *<20 5172 NP 000 93 29 41 57 <br /> 02/12/97 SAMPLES LOST 47 80 NP 000 93 29 4549 <br /> 05/14/97 <50 <03 044 <0 3 <0 5 *42 51 92 NP 000 9329 41 37 <br /> 08/13/97 <50 <03 <03 <03 <0 5 <20 - - <br /> 11/13/97 3 400 790 3 0 <15 13 <20 5080 NP 000 93 29 4249 <br /> 02/11/98 9 300 920 2 000 140 900 2000 4820 NP 000 9329 4509 <br /> 05/28/98 2 500 <0 3 <0 3 <0 3 <0 5 5 100 4960 NP 000 93 29 4369 <br /> 08/12/98 1 600 <0 3 <0 3 <0 3 <0 5 1 400 3990 NP 000 93 29 5339 <br /> 11/10/98 610 <0 3 <03 <0 3 <05 2,100 4650 NP 000 9329 4679 <br /> 02/25/99 1 <50 <03 <0 3 <0 3 <05 <20 37 85 NP 000 14 63 -2322 <br /> 05/14/99 850 <0 3 <0 3 <0 3 <0 5 1 200 4473 NP 000 1463 30 10 <br /> I <br /> 171 TAB X1_S Page 2 of8 9/2&/00 <br />