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Table 1
<br /> Groundwater Monitoring Data Page 4 of 4
<br /> ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California
<br /> Well Elevation Static Top Elevation
<br /> Sample of Top Water of of Ethyl- Total
<br /> Number Date of Casing Level Screen Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations
<br /> MW-5(cont)
<br /> MW-5(60) 08/29/95 9 37 4007 -3070 5,700 410 150 310 590 NA No FP,No S,Yes O
<br /> MW-5(61) 12/04/95 9 37 3863 -2926 1,200 55 11 83 92 NA No FP,No S,Yes 0
<br /> MW-5 02/02/96 9 37 3666 -2729 270 7 6 15 11 9 8 NA No FP,No S,Yes 0
<br /> MW-5(60) 05/10/96 9 37 34 15 -2478 5,700 420 180 380 610 34 No FP,No S,Yes O
<br /> MW-5(60) 08/29/96 9 37 3599 -2662 9,600 510 90 710 970 39 No FP,No S,Yes O
<br /> MW-5(60) 11/20/96 937 34 83 -2546 4,500 210 93 310 510 <50** No FP,No S,Yes O
<br /> MW-6
<br /> MW-6(58) 12/16/93 895 4277 4000 -33 82 <50 <0 5 <0 6 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(39) 04/08/94 8 95 3973 -3078 28 4 8 3 9 3 9 2 2 NA No FP,No S,O=NE
<br /> MW-6 06/22/94 8 95 4031 -3136 <10 <0 3 <0 3 <0 3 <0 5 NA No FP,No S,O=NE
<br /> MW-6(43) 09/23/94 895 4259 -3364 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=N
<br /> MW-6(46) 12/02/94 8 95 4166 -3271 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE
<br /> MW-6(58) 02/15/95 895 4002 -3107 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE
<br /> MW-6(58) 05/12/95 8 95 3826 -2931 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(59) 08/29/95 895 3991 -3096 **<52 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(58) 12/04/95 895 3838 -2943 **<70 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6 02/02/96 8 95 3638 -27 43 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(59) 05/10/96 8 95 3388 -2493 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0
<br /> MW-6(59) 08/29/96 895 3566 -2671 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0
<br /> MW-6(59) 11/20/96 8 95 3457 -25 62 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No O
<br /> Analytical results in parts per billion
<br /> Iib-Total petroleum hydrocarbons as gasoline
<br /> MTBE-Methyl-tert-butylether
<br /> Elevation datum is mean sea level
<br /> Measurements in feet
<br /> NA-Not analyzed NM-Not measured NE-Not evaluated.
<br /> *-Well paved over on 43/0483 **-Raised MRL due 10 matrix interference
<br /> *** The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline,the chromatogram does not match the typical gasoltne fingerprint-
<br /> Bailer blank FP-Free product S- Sheen O-Obvious product odor
<br /> Below detection limits used by laboratory
<br /> Sample designations
<br /> MW 404) Well lD and sample de (feet)
<br /> - , , -, 1—- R n I it nm7
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