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TABLE 2A GROUNDWATER DATA THRIFTY OIL STATION#171,STOCKTON,CA DATE ANALY'T'ICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLEDffTPH BENZENE TOLiJENE [�E�thYlliennue XYLENE MT13E GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (OSO) fP ) P ) (ug/1} fvgtl) (deet} (feet) (feet) (feet) (feef} 11l10198 31 400 7 000 SDO <30 3 900 24 000 5205 NP 000 9336 4i 31 02125!99 13 400 <3 <3 <3 <5 13000 37 98 NP 000 1468 -2330 05/14/99 15000 17 <0 3 <0 3 0 83 1 600 42 76 NP 000 1468 2808 08/18/99 260 <0 3 <0 3 <0 3 <0 5 240 3822 NP 000 14 66 23 54 —71/16/99 43 000 6 604 910 90 4 900 26 000 4044 NP 000 1468 -2576 02109/00 1 28 004 5 800 440 <30 2 400 18 000 39 15 NP 000 1468 2447 05/17/00 130 <0 25 <0 25 <0 25 <0 5 19 900 43 76 NP 000 1469 2908 08123!00 99 100 5 350 1 800 444 2 770 25 100 39 75 IVP 000 1468 25 07 k II15I04 21 300 6 370 l 5]0 26 I l 450 10400 42 23 NP 000 1469 27 55 02/14/01 24 700 4 740 194 <0 2 1 030 17700 39 61 NP 000 1468 -2493 05/15/01 12000 <0 3 102 c0 2 <0 4 34 000 39 61 NP 000 1468 2493 08/15/01 11 900 <3 0 <2 0 <2 0 <4 0 30 900 4069 NP 000 1468 -2601 11106!0 I 13 40D 132 165 <2 0 76 23 200 45 80 NP 4 04 14 68 31 l2 02113!02 101 000 7 260 14 100 2 950 16 300 23 800 42 80 NP 0 00 l4 68 28 12 05/07/02 30 500 142 <2 0 <2 0 3 830 ID 600 41 52 NP 000 1468 -2684 08/07/02 6 570 <0 8 <1 8 <1 7 <4 0 14 100 4650 NP 000 1468 3182 11/13/02 166 000 12 700 8 800 3 300 24 600 ---40-4-00 4905 NP 000 1468 3437 02119103 59 040 5,250 362 4410 8200 33 700 4903 NP 000 1468 34 35 05/14/03 17 800 213 <16 <15 5 1650 21,700 4403 — NP 000 1468 29 35 08/12/03 23 400 <5 5 <8 0 <7 75 <10 l7 000 48 17 NP 000 1468 3349 11/24103 179 000 6 630 39 700 3 330 21 100 11 640 4992 NP 000 1468 -3524 02/11/04 38 900 2 850 4 600 <15 5 5 000 10 000 47 12 NP 000 1468 32 44 05112!04 5 430 <0 22 <0 32 <0 31 <0 4 7 984 4592 NP DOD 14 68 -31 24 08/17/04 3,240 <0 22 <4 32 <0 31 <04 3 650 5072 NP 000 1468 36 04 11/23104 149 000 75 200 12000 3 040 ]0 300 ---1799--00 5144 NP 000 1469 36 76 02/09/05 118 000 18 200 10900 l p909 090 22 100 48 68 NP 000 1468 34 DO 03/25/05 WELL CONVERTED INTO VAPOR EXTRACTION WELL VW-5 MONITORING WELL#MST'-6 Screen Interval=65 to98 ed 11/20/92 2 400 80 72 100 420 03/31/93 14 400 1 400 1 100 450 1 600 71 08 NP 000 9458 23 50 06/23/93 1 600 120 93 50 160 69 12 NP 000 94 58 25 46 09/13/93 32 000 3,700 3 400 1 300 7,700 7195 NP 000 94 58 2263 12/13/93 44 000 2 500 5 900 1 500 5 400 7240 NP 000 9458 22 18 03/08/94 150 65 3 6 l 1 80 6685 NP 0 00 9458 2773 06/07/94 4 900 660 360 15 440 6440 NP 000 94 58 30 18 09107/94 150 000 16 000 7 300 1 900 12000 6762 NP 000 9459 2696 Page 5 of 12