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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION #172, STOCKTON, CA DATE ANALY'T'ICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH BENZENE TOLUENE E16y1Wenzene XYLIINE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION E�1 ) (ug/,•) (ems) (09/L) (ug/L) (feet) (feet) (feet) (feet) (feet) 11/26/97 <50 <03 <03 <03 <05 <20 3980 NP 000 1242 -2738 02/11/98 <50 <03 <03 <03 <05 <20 38 62 NP 000 1242 -2620 05/27/98 <50 <0 3 <0 3 <0 3 <05 <20 4030 NP 000 1242 -2788 08/26/98 <50 <0 3 <0 3 <0 3 <05 <20 35 10 NP 000 1242 -2268 11/24/98 <50 <0 3 <0 3 <03 <05 <20 3400 NP 000 1242 -2158 02/18/99 <50 <03 <0 3 <03 <05 <20 3245 NP 000 1242 -2003 05/20/99 <50 <0 3 <03 <0 3 <05 <20 3095 NP 000 1242 -1853 08/18/99 <50 <0 3 <03 <0 3 <05 <20 33 98 NP 000 1242 -21 56 11/10/99 <50 <0 3 <03 <03 <05 <20 35 53 NP 000 1242 -23 11 02/23/00 <50 <0 25 <0 25 <0 25 <05 *<51 <5 40 14 NP 000 12 42 -2772 05/10/00 <50 <0 25 <0 25 <0 25 <05 <5 3000 NP 000 1242 -1758 Monmww Well=11fW 8 05/31/94 87,000 7,500 4,500 1,500 5,000 4860 08/15/94 34,000 4,100 1,100 41 1,600 - 5125 - - - 11/08/94 ND ND ND ND ND - 5194 - 02/08/95 1,200 1,300 440 640 510 - 48 89 _ 05/09/95 1 27,000 5,000 1 860 1 800 680 - 4744 - - 07/11/95 1 WELL ABANDONED U oniffi in Well-MW-9 02/29/96 ND 047 ND ND ND 46 12 NP 000 1152 -3460 05/29/96 <50 0 31 <03 <03 <05 <1 4070 NP 000 1152 -2918 08/14/96 <20 <03 <03 <03 <0 5 <50 43 10 NP 000 11 52 3158 11/26/96 <50 <0 3 <03 <0 3 <0 5 <20 43 06 NP 000 11 52 -3154 02/25/97 <20 <0 3 039 <03 <05 <50 4080 NP 000 11 52 -2928 05/28/97 <50 <0 3 <0 3 <0 3 <05 <20 43 10 NP 000 11 52 3158 08/19/97 <50 <0 3 <03 <0 3 <0 5 <20 4150 NP 000 1152 -2998 11/26/97 <50 <03 <0 3 <0 3 <05 <20 41 10 NP 000 I1 52 -2958 02/18/98 <50 <D 3 <0 3 <0 3 <D 5 <20 37 42 NP 000 11 52 -2590 05/27/98 <50 <0 3 0 57 <0 3 0 77 <2D 41 46 NP 000 1 11 52 -2994 172TA*S Page 10 6/19/00 1 �