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• s s TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION#171, STOCKTON,CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENE EthylBenxene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION 419/0 (uglL) (ugL) (ug/L) (tt91L) (ug L) (t'eet) (feet) (feet) (feet) (feet) 08/13/97 27 000 5 000 1900 <6 2,300 15 000 - - 11/13/97 24 000 7 500 1 100 <0 3 2 400 16 000 5020 NP 000 9336 43 16 02111/98 20 000 4,200 250 <15 1,300 11000 47 20 NP 000 9336 46 16 05/28/98 4 600 <0 3 <0 3 <0 3 <0 5 8 700 49 10 NP 000 9336 44 26 08/12/98 130 000 17 000 9 500 1 000 8 900 26 000 3960 NP 000 93 36 5376 11/10/98 31,000 7 000 500 <30 3 900 24 000 5205 NP 000 93 36 41 31 02/25/99 13,000 <3 <3 <3 <5 13,000 3798 NP 000 14 68 -23 30 05/14/99 15 000 17 <0 3 <0 3 0 83 1 600 4276 NP 000 1468 -28 08 08/18/99 260 <03 <0 3 <0 3 <0 5 240 3822 NP 000 1468 -23 54 11/16/99 43 000 6 600 910 90 4 900 26 000 4044 NP 000 1469 -2576 02/09/00 28 000 5 800 440 <30 2 400 18 000 3915 NP 000 1468 -2447 05/17/00 130 <0 25 <0 25 <0 25 <0 5 19 900 4376 NP 000 1468 2909 08/23/00 99 100 5,350 1,800 904 2 770 25 100 3975 NP 000 1468 2507 11/15/00 21 300 6,370 1,510 26 I 1,450 10,400 4223 NP 000 1468 -2755 02/14/01 24,700 4 740 €94 <0 2 1,030 17 700 3961 NP 000 1468 2493 05/15/01 12 000 <0 3 <02 <0 2 <0 4 34,000 3961 NP 000 1468 -2493 08/15/01 11 900 <30 <2 0 <2 0 <4 0 30,900 4069 NP 000 1468 -2601 11/06/01 13 000 132 165 <2 0 76 23,200 45 80 NP 000 1468 -31 12 02/13/02 101 000 7 260 14 100 2 950 16 300 23 800 42 80 NP 000 1468 -28 12 05/07/02 30 500 142 <2 0 <2 0 3,830 10,600 4152 NP 000 1468 2684 08/07/02 6 570 <0 8 <18 <17 <4 0 14 100 4650 NP 000 1468 3182 11113/02 166 000 12,700 8,804 3 300 24,600 40 400 4905 NP 000 1469 3437 02/19/03 59 000 5 250 362 4 410 8 200 33 700 4903 NP 000 1469 3435 05/14/03 17,800 213 <16 <15 5 1,650 21 700 4403 NP 000 1468 2935 08/12/03 23 400 <5 5 <8 0 <7 75 <10 17 000 48 17 NP 000 1468 33 49 11/24/03 179,000 6,630 39 700 3 330 21 300 31 600 4992 NP 0 00 1469 3524 02/11/04 38,900 2 850 4 600 <15 5 5 000 10,000 47 12 NP 000 1468 -3244 05/12/04 5 430 <0 22 <0 32 <0 31 <0 4 7 980 4592 NP 000 14 68 -3124 08/17/04 3 240 <0 22 <032 <0 31 <0 4 3 650 5072 NP 000 14 68 -3604 11/23/04 149 000 15 200 12 000 3 040 10 300 19 900 51 44 NP 000 1468 -36 76 02/09/05 118,000 18,200 10,90() 1 090 9,090 22,100 48 68 NP 000 1468 -3400 03/25/05 ABANDONED MONITORING WELL#MW-6 Screen Interval=65 to 90 eet 11/20/92 2,400 80 72 100 420 03/31/93 14 000 1 400 1,100 450 1 600 71 09 NP 0 00 9459 2350 06/23/93 1 600 120 93 50 160 69 12 NP 0 00 94 58 2546 171 TAB1 XLS Page 5 of 12 8/29/2005