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STAS I <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#171, STOCKTON,CA <br /> DATF ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLEDL BENZENEP== <br /> XYLENE MTBEGROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> (u L) (�gJL3 (�) (feet) (fes) (feet) (feet) (feet) <br /> MONITORING WELL#MW-4 Screen Interval=65 to 90 eet <br /> 11/20/92 36,000 3 800 3200 1,800 11,000 <br /> 03/31/93 31,000 2,000 1,200 910 5,700 7006 NP 000 9329 23 23 <br /> 06/23/93 21 000 1 800 980 670 2,000 6790 NP 000 9329 25 39 <br /> 09/13/93 55 000 7,600 5,500 1,500 5200 7025 NP 000 9329 23 04 <br /> 12/13/93 40,000 2 600 2,200 1 100 6,000 7095 NP 000 9329 22 34 <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 OS NP 0 00 9329 3024 <br /> 09/07/94 12 000 1,700640 260 930 6628 NP 000 9329 2701 <br /> 06106195 19000 3 700 360 190 800 <br /> 08/16195 1 100 1900 87 ND 360 59 44 NP 000 9329 <br /> 33 85 <br /> 11113/95 16 000 2 600 3,900 230 1 300 59 93 NP 0 00 93 29 33 36 <br /> 02/13/96 7,300 2,300 89 ND 160 5949 NP Goo 9329 3380 <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 5240 NP 000 9329 4089 <br /> 11114/96 <5( <0 3 <0 3 <0 3 <0 5 *<20 5172 NP 000 93 29 1 4157 <br /> 02/12/97 SAMPLES LOST 4780 NP 000 9329 4549 <br /> 05/14/97 <50 I <0 3 044 <0 3 <0 5 *42 5192 NP 000 9329 4137 <br /> 08/13/97 <50 <03 <0 3 <0 3 <0 5 <20 - - <br /> 1 l!13197 3,400 790 30 <15 13 <20 5090 NP 000 93 29 4249 <br /> 02/11/98 9,300 920 2,000 140 900 2,000 48 20 NP 000 93 29 4509 <br /> 05/28/98 2,500 <0 3 <0 3 <0 3 <05 5,100 4960 NP 000 9329 4369 <br /> 09/12199 1 600 <03 <0 3 <0 3 <0 5 1 400 3990 NP 000 93 29 53 39 <br /> 11/10/98 610 <0 3 <0 3 <0 3 <0 5 2 100 4650 NP 000 9329 4679 <br /> 02/25/99 <50 <0 3 <0 3 <0 3 <0 5 <20 3785 NP 000 1463 -2322 <br /> 05/14/99 850 <0 3 <0 3 <0 3 <0 5 1,200 4473 NP 000 1463 3010 <br /> 08/18/99 620 <0 3 <0 3 <0 3 <0 5 940 3842 NP 000 1463 -23 79 <br /> 11/16/99 <50 <0 3 <0 3 <0 3 <05 <20 4054 NP 000 1463 -25 91 <br /> 02/09/00 <50 <0 3 <0 3 <0 3 <0 5 <20 39 88 NP 000 1463 -25 25 <br /> 05/17/00 <50 <0 25 04 <0 25 07 <0 5 4448 NP 000 1463 -2985 <br /> 08/23/00 73 <0 3 <0 2 <0 2 <0 4 25 3982 NP 000 1463 -25 19 <br /> 11/15/00 <50 <0 3 <0 2 <0 2 <04 <0 6 4294 NP 000 1463 -28 31 <br /> 02/14/01 <50 <0 3 <0 2 <0 2 <0 4 <06 4061 NP 000 1463 -25 98 <br /> 05/15/01 <50 <0 3 <0 2 <0 2 <04 37 4061 NP 000 1463 2599 <br /> 08/15/01 <50 <0 3 <0 2 <0 2 <04 1 4244 NP 000 1463 -27 81 <br /> 11/06/01 <50 <0 3 <0 2 <0 2 <0 4 <0:6= 45 95 NP 000 1463 -3132 <br /> 02/13/02 <50 1 7 <0 2 1 5] <04 25 4290 NP 000 1463 -2127 <br /> 051M M) <50 <0 3 <0 2 <0 2 <0 4 <0 6 4137 NP 0 00 l4 63 -2674 <br /> 171TAB 1 XL5 <br /> Page 3 of I I 8131104 <br />