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TAR 1 ' J GROUNDWATER DATA THRIFTY OIL STATION#171, STOCKTON,CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SANIPPLED TPH-g BENZENE TOLUENE EthYWenzenc XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ug(L) (ug/L) (ag1L) (uglL) (ug1L) (ug(L) (feet) (feet) (feet) (feet) (feet) 08/07/02 <50 <0 08 <0 18 <0 17 <0 4 <0 07 4650 NP 000 1463 -31 87 11/13/02 <50 <0 08 <0 18 <0 17 <0 4 9 3 49 12 NP 000 1463 -3449 02/19/03 <15 <0 22 <0 32 <0 31 <04 <0 18 49 10 NP 000 1463 3447 0914103 96 <0 22 <0 32 <0 31 3 5 J 31 4420 NP 000 1463 -29 57 08/12103 <15 <0 22 <0 32 <0 31 <04 <0 18 4832 NP 000 1463 -33 69 11/24103 <15 <0 22 <0 32 <0 31 <04 <0 18 4992 NP 000 1 1463 -3529 02/11104 <15 <0 22 <0 32 <0 31 <04 <0 18 47 18 NP 000 1463 3255 05/12/04 <15 <0 22 <0 32 <0 31 <0 4 <0 18 45 96 NP 000 1463 3133 08/17/04 <15 <0 22 <0 32 <0 31 <0 4 <0 l8 50 81 NP 000 1463 36 18 11123104 66 <0 22 <0 32 <0 31 <04 <0 18 51 54 NP 000 1463 -3691 02/09/05 59 <0 22 <0 32 <0 31 <04 <0 18 48 80 NP 000 1463 -34 17 MONITORING WELL 4#MW-5 Screen Iintervat=20 to 90 eet i 11/20/92 - - 03/31/93 25 000 2 700 - - - 6899 NP 000 93 36 2447 06/23/93 2,800 100 4,600 430 6 300 6925 NP 000 93 36 25 11 09/13/93 - - 110 53 270 71 73 NP 000 9336 2163 j 12/13/93 - - 72 10 SHEEN 000 9336 2126 03/08/94 - 6543 SHEEN 000 9336 2793 06/07/94 - 6305 SHEEN 000 93 36 3031 09/07/94 6624 SHEEN 000 93 36 27 12 08/16/95 5909 SHEEN 000 9336 3428 11/13/95 59 000 5 100 13 000 1,500 11,000 5909 NP 000 9336 3428 02/13/96 20 000 3200 3 300 340 1,800 - 59 11 NP 000 93 36 3425 05/14/94 68,000 12 000 18,000 2,300 13 000 4942 NP 000 93 36 4394 08/28/96 56 000 9,000 8 500 310 6,600 *9,900 5290 NP 000 93 36 4046 11/14/96 14,000 1,900 99 <3 2,700 *8 500 51 65 NP 000 9336 4171 02/12/97 SAMPLES LOST - 4820 NP 000 9336 45 16 05/14/97 29 000 45 3,400 <15 2 600 *17 000 5549 NP 000 93 36 3787 08/13/97 27 000 5 000 1,900 <6 2 300 15 000 - - - - 11/13/97 24 000 7 500 1 100 <03 2 400 16 000 5020 NP 000 93 36 43 16 02/11/98 20 000 4200 250 <15 l 300 11000 47 20 NP 000 93 36 46 16 05/28/98 4 600 <0 3 <0 3 <0 3 <0 5 8 700 4910 NP 000 9336 4426 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 9336 4131 02/25/99 13 000 <3 <3 <3 <5 13 000 3799 NP 000 1468 -23 30 051 14199 15,000 17 <0 3 <0 3 083 1 600 4276 NP 000 1468 1 28 08 171 TAB i XL S Page 4 of 11 3/3/2005