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TA# 1 ' <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#172,STOCKTON,CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLER TPH BENZENE TOLUENE EthyiBenzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> (ug1L) (uglL) (u91L) (ug/l) Cugll-) (ug/1.) 0-0 (feet) (feet) (feel) (Feet <br /> 11/20/02 5 170 190 18 179 421 32 3409 NP 000 13 18 2091 <br /> 02112/03 <t5 <0 22 <0 32 <0 31 <0 4 31 32 55 NP <br /> 000 1318 19 38 <br /> 05/21/03 61 700 9 820 9 000 158 J 4690 4 500 3947 NP 000 13 18 2629 <br /> 08/20/03 144 000 2 600 2 910 <15 5 4 360 39 500 3852 NP 000 13 18 25 34 <br /> 11/26/03 38 600 5 670 8 150 397 3 180 127 3926 NP 000 13 18 2608 <br /> 02/05/04 61 000 3 550 7 006 5 380 31400 156 3793 NP 000 13 18 2475 <br /> 05/05/04 62 800 1 63D 7 860 592 6 380 25 100 3672 NP 000 13 18 2354 <br /> 08/11/04 193 000 24 200 30 400 1 480 12 200 941 4006 NP 000 13 18 -2688 <br /> 09/30/04 229 000 31 000 33 900 3 400 18 200 736 4090 NP 000 13 18 -2772 <br /> 11/10/04 221 000 26 500 28 800 2070 13 000 776 4009 NP 000 13 18 -2691 <br /> 02/22/05 23 700 814 727 577 2 180 5 Ito 3640 NP 000 13 18 2322 <br /> 0511 1105 124 000 33 100 25 600 1 900 13 000 865 35 10 NP 0 00 13 18 2192 <br /> NOTE N€3=Nondetectable <br /> =Not analyzed 1 Not available Benzene toluene ethlybenzene and xylene analyzed by EPA method 8020 <br /> NP=No free hydrocarbon product Total petroleum hvdrocarbons(TPH)analyzed by EPA method 8015 modified for gasoline <br /> *"=MTBE by 8020 or 8020/8260 Methyl Cert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8118100 and beginning 2/15101 BTEX and MTBE analyzed by EPA Method 8260B <br /> 172TAB1 XLS Page 11 of 11 61005 <br />