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TA 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#171,STOCKTON,CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLED TPH-g BENZENE TOLUENE EthylReuzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> (ugfL) (up/L) (ugtl) 0,91) (uglL) (ugJL) (feet) (feet) (feet) (feet) (Feet) <br /> 02109!00 240 <0 3 <0 3 <03 <0 5 480 42 02 NP 000 1463 2739 <br /> 05/17/00 <50 <0 25 <0 25 <0 25 <0 5 492 4506 NP 000 l4 63 3043 <br /> 08/23/00 90 92 <0 2 <02 <04 563 3957 NP 000 14 63 -2494 <br /> 11/15/00 <50 <03 <02 <02 <04 31 43 50 NP 000 1463 -28 87 <br /> 02/14/01 <50 3 8 J <02 <0 2 <0 4 14 3975 NP 000 1463 -25 12 <br /> 05/15101 <50 <0 3 <02 <0 2 <0 4 43 3975 NP 000 14 63 25 12 <br /> 08/15/01 <50 <0 3 <0 2 <0 2 <0 4 <06 4350 NP 000 1463 -2987 <br /> 11/06/01 <50 <0 3 <02 <02 <04 <06 45 75 NP 000 1463 -31 12 <br /> 02/13/02 214 14 <02 <02 <04 114 4290 NP 000 1463 -28 27 <br /> 05/07/02 <50 <0 3 <02 <02 <04 <0 6 43 45 NP 000 1463 28 82 <br /> 08/07/02 <50 <0 09 <0 18 <017 <04 <0 07 4632 NP 000 14 63 -3169 <br /> 11/13/02 <50 <0 08 <0 18 <017 <0 4 75 4905 NP 000 1463 -3442 <br /> 02119/03 <15 <0 22 <0 32 <031 <0 4 <0 18 4904 NP 000 1463 -3441 <br /> 05/14/03 <15 <0 22 <0 32 <031 <04 <0 18 44 16 NP 000 1463 -2953 <br /> 08/12/03 <15 <0 22 <0 32 <031 <04 <0 18 4804 NP 000 1463 3341 <br /> 11/24/03 <15 <0 22 <032 <0 31 <04 <0 18 4987 NP 000 1463 -3524 <br /> 02/11/04 <15 <0 22 <0 32 <0 31 <04 18 47 14 NP 000 1463 -3251 <br /> 05/12/04 55 <0 22 <0 32 <0 31 <04 13 4587 NP 000 1463 -3124 <br /> 08/17/04 107 33 83 2 1 J 13 62 5056 NP 000 1463 -3593 <br /> 11/23/04 110 <0 22 <0 32 <0 31 <04 38 51 48 NP 000 1463 -3685 <br /> 02/09/05 82 <0 22 <0 32 <0 31 <0 4 41 48 73 NP 0 00 14 63 34 10 <br /> MONITORING WELL#T$-11 Screen Intervals=5 to 30 eet and 35 to 60feet <br /> 02/25/99 <50 <0 3 <03 <0 3 <0 5 1 <20 1 3805 NP 000 - <br /> 05/14/99 - - - DRY - <br /> 08/18/99 - DRY - <br /> I <br /> MONITORING WELL M-12 Screen Intervals=5 to 30 eet and 35 to 60 eet <br /> 02/25/99 4,400 49 O81 <0 3 29 12,000 3970 NP 000 <br /> 05/14/99 - DRY - <br /> 08/18/99 I - DRY <br /> NOTE ND—Nondetectable Benzene toluene ethlybenzene and xylene analyzed by EPA method 8020 <br /> NP=No free hydrocarbon product Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015 modified for gasoline <br /> =Not analyzed/Not available Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> *"=MTBE by 8020 Beginning 8123100 BTEX and MTBE analyzed by EPA Method 8260B <br /> 171 TAB I XL S Page 11 of 11 313/2005 <br />