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<br /> Groundwater Monitoring Data Page 3 of 3
<br /> ARCO Service Station No 054% 1612 Hammer Lane, Stockton, California
<br /> Well Elevation Static Elevation
<br /> Sample of Top Water of Ethyl Total
<br /> Number Date of Casing Level Groundwater TPHG Benzene Toluene benzene Ryienes TOG Observations
<br /> MWS
<br /> 44 MW5 03/29/93 9 37 44 25 3488 930 16 <0 5 19 9 7 NA No FP,No S,Yes 0
<br /> MW-5(61) 06/07/93 9 37 43 38 3401 1 100 40 14 42 58 NA No FP,No S,Yes O
<br /> MW-5(60) 09/02/93 937 4532 3595 1,200 76 17 52 57 NA No FP,No S,Yes 0
<br /> MW-5(60) 12/16/93 937 4303 3366 820 34 1 4 39 41 NA No FP,No S,Yes 0
<br /> MW-5(39) 04/08/94 9 37 39 99 3062 4,800 640 68 670 800 NA No FP,No S,O=NE
<br /> MW 5 06/22/94 9 37 4054 31 17 9,200 1,100 140 1,300 2,000 NS No FP No S,O=NE
<br /> MW-5(43) 09/23/94 9 37 4278 3341 2 700 400 31 150 310 NS No FP,No S,O=NE
<br /> MW-5(46) 12/02/94 9 37 4189 3252 2,200 380 28 210 330 NS No FP,No S,O=NE
<br /> MW-5(60) 02/15/95 937 4028 3091 6,700 420 87 620 1,100 NS No FP,No S,O=NE
<br /> MW-5(61) 05/12/95 9 37 3895 2908 5,000 560 110 400 600 NS No FP,No S Yes 0
<br /> MW-5(60) 08/29/95 9 37 40 07 -3070 5,700 410 150 310 590 NS No FP No S,Yes 0
<br /> MW-5(61) 12/04/95 937 3863 2926 1,200 55 11 83 92 NS No FP,No S,Yes 0
<br /> MW 5 02/02/96 9 37 3666 2729 270 7 6 15 11 98 NS No FP,No S,Yes 0
<br /> MW6
<br /> MW-6(58) 12/16/93 895 4277 3382 <50 <0 5 <0 6 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(39) 04/08/94 895 39 73 3078 28 48 3 9 3 9 22 NS No FP,No S,O=NF
<br /> MW-6 06/22/94 895 40 3t 3136 <10 <0 3 <0 3 <0 3 <0 5 NS No FP,No S,O=NE
<br /> MW-6(43) 09/23/94 895 42 59 -3364 <50 <0 5 <0 5 <0 5 <0 5 NS No FP,No S,O=NE
<br /> MW-6(46) 12/02/94 895 4166 3271 <50 <0 5 <0 5 <0 5 <0 5 NS 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 NS No FP,No S,O=NE
<br /> MW-6(58) 05/12/95 895 38 26 2931 <50 <0 5 <0 5 <0 5 <0 5 NS No FP No S,No 0
<br /> MW 6(59) 08/29/95 895 39 91 3096 **<52 <0 5 <0 5 <0 5 <0 5 NS No FP,No S,No 0
<br /> MW 6(58) 12/04/95 895 38 38 2943 **<70 <0 5 <0 5 <0 5 <0 5 NS No FP No S,No 0
<br /> MW 6 02/02/96 895 36 38 2743 <50 <0 5 <0 5 <0 5 <0 5 NS No FP,No S,No 0
<br /> Analytical results in pans per billion
<br /> HG-Total petroleum hydrocarbons as gasoline
<br /> OG-Total oil and grease
<br /> i
<br /> Elevation datum is mean sea level
<br /> Measurements in feet
<br /> NS-Not sampled NM Not measured NE Not evaluated
<br /> *-Well paved over on 03/04/93 **-Raised MRL due to matrix mterfererim
<br /> ***-The sample contains a lower boding point hydrocarbon mixture quantified as gasoline,the chromatogram does not match the typical gasoline fingerprint
<br /> Bailer blank FP-Free product S- Sheen 0-Obvious product odor
<br /> Below detection limits used by laboratory
<br /> Sample designations
<br /> MW 4(34) Well ID and sample d (feet)
<br /> N\xls',0805M4WM22896AI xis Revision 1 2/28/96
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