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								           												Table 1
<br />     										Groundwater Monitoring Data
<br />												1995 to Present
<br />    						ARCO Service Station No  548, 1612 Hammer Lane, Stockton, California
<br />       	Well    			Elevation  Static   Top      Ele�atwn   Groundwater
<br />    	Sample     			of Top   Water    of  	of    	Flow  					Ethyl-    Total
<br />   	Number    	Datc  	of Casing  Level  Screen Groundiiatcr   Direction    TPHG    Benzene  Toluene benzene Xvlenes  MTBE [11     Observations
<br />     	MW-1 (56)   02/15/95    	1036    41 19   4851       -3083    	E   	59	2 1	25	10	3 3	NA      No FP,No S,O=NE
<br />     	MW-1 (56)   05/12/95    	1036    3933		-2897    	E   	84	47	41	17       65	NA      No FP,No S, Yes 0
<br />     	MW-1 (56)   08/29/95    	1036    4089		-3053    	E   	190	80	58       47	18	NA      No FP,No S,Yes 0
<br />     	MW-1 (56)   12/04/95    	1036    3953		-29 17    	E   	78	23 	14	14	5 3	NA      No FP,No S,Yes O
<br />     	MW-1 	02/02/96    	1036    3757		-2721    	E   	59	34	15	1 5	49	NA       No FP,No S,No 0
<br />     	MW-1 (56)   05/10/96    	1036    3504		-2468    	E   	92	55	21	24	12 	<3	No FP,No S,No 0
<br />     	MW-1 (56)   08/29/96    	1036    3677		-2641    	E   	100	42	14	32	12 	<3	No FP,No S,No O
<br />     	MW-1 (56)   11/20/96    	1036    3575		-25 39    	E   	140	60	15       46	18 	<3	No FP,No S,No 0
<br />     	MW-1 (56)   03/19/97    	1036    3202		-21 66  	E-SE 	230	11 	22       64	20 	<3	No 1 P,No S,No O
<br />     	MW-I (56)   05/27/97    	1036    32 27		-2191  	E-SE 	300	18 	16	10	25 	<3	No I P,No S,No 0
<br />     	MW-1 (55)   08/12/97    	1036    33 64		-23 28    	E   	110 	7	075       4 8	96 	<5	No FP,No S,No 0
<br />     	MWA (56)   11/18/97    	1036    33 38		-2302    	E   	180	15 	1 3	10 	14 	<5	No FP,No S,No 0
<br />     	MWA (57)   02/16/98    	1036    3003		-1967   	SE  	<50	19	2 8       074       2 7 	<5       No FP,No S,Yes O
<br />     	MW-1 (56)   06/23/98   [P]      1036    2748		-17 12   	SE  	103       458      0 581      3 17       146	<5	No H,No S,No 0
<br />     	MW-I (55)   09/29/98   [P]      1036    2925		-1889    	L   	151	124       <0 5      807      2 38	<5       No FP,No S, Yes 0
<br />     	MW-1 (55)   12/30/98   [P]      1036    2702		-1666   	SE  	619       372       <0 5      142      <0 5	<5	No FP,No S,No 0
<br />     	MW-I (55)   03/31/99   [P]      1036    2563		-1527  	E-SE 	<50       1 43       <0 5     0 662     <0 5	<5	No H,No S,No 0
<br />     	MW-1 (55)   06/28/99   [P]      1036    2675		-1639   	SE  	252       245       <0 5       123      298       651       No FP,No S,No 0
<br />     	MW-1 (55)   09/10/99   [P]      1036    2875		-1839    	E   	199       13 9       <0 5      8 13      701       502       No FP,No S,No 0
<br />     	MW-1 (55)   12/13/99   [P]      1036    2785		-1749    	L   	<50       <0 5       <0 5      <0 5      <0 5       588      No FP,No S,O=NE
<br />     	MW-1 (55)   03/28/00   [P]      1036    2461		-1425   	SE  	109       329       <0 5       186      089       443       No FP,No S,No 0
<br />     	MW-1 (56)   06/26/00   [P]      1036    2560		-1524    	E  	702       646       <0 5       146      092     <2 0[2]      No FP,No S,No 0
<br />     	MW-1 	09/28/00   [P]      1036    28 14		-1778  	E-NE	548       2 18       <0 5      1 11      <0 5       <2 5       No FP,No S,No 0
<br />     	C VVZC0105481QfRM0548Q300       																			Delta
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