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I <br /> SUMMARY OF GROUNDWATER10lb7ATION AND ANALYTICAL DATA <br /> STOCKTON MAINTENANCE STATION <br /> STOCKTON,CALIFORNIA <br /> Depth To Groundwater TPII-G TPII-D Benzene Toluene Ethyl- benzene Total MTBE <br /> Wd1 r D Date TOC Elevation Groundwater Elevation (10) {µg11) (µ9A) (µg11) W/) Xylenes (P94) <br /> (µY.11) <br /> i <br /> VW-1 02/0611996 2173 6296 -4123 10 000 <50 1 700 ----1300 860 960 <50 <br /> VW 1 04/11/1996 _ 2173 v 6142 -3969 -- __VW 1 04123/1996 _ 2173 6112 -3939 16 000 <50 720 _-1500 _ 580 _ '1700 98 <br /> VW 1 07/0211996 2173 5998 -3825 13000 650 3 500 260 470 _ _1,300 37 <br /> _ <br /> VW 1 10/2311996 21 73 _ 6037 -3864 8200 _ 190 1900 271 _ 220 370_ _31 _ <br /> VW 1 0512811997_ 2173 5537 -3364 7 100 <500 1,400 _ _21 140 180 T 7 4(<5) <br /> VW-1 1012111997 21 73 5748 -3575 2 700 <500 840 12 32 140 ---74(<5) <br /> 8 2(<5) <br /> 3Q VW ldup NA NA NA NA -- -- — <br /> VW-1 12129/1997 21 73 5694 -3521 1700 440 450 11 21 _ _120 <5 <br /> VW-1 03/16/1998 2173 5347 _ -3174 1 500 640 280 <0 5 _ 31_ _ 92 <5 <br /> VW-1 _ 06!2611998 21 73 4966 -2793 <500 <5000 19 ---37 59 41 (<5) <br /> VW 1 09/28/1998 21 73 _ 5155 -2982 500 6000 43 23 31 5 0_ -1 8(<5) <br /> VW 1--_ 12/02/1998 _ 2173 __49 78 _ _28 05 <500 <400 30 <1 0 30 04 1 0(<l 0) <br /> VW-1 _ 03/31/1999 _21 98 _ 4627 -2429 �<100 <100 24 _ <02- - <0 l <41__-_ - <06 <br /> -VW-2- 02!06!1996 2190 -63 17 -41 27 16 000 <50 3 000 3 100 260 2000 <50 <br /> VW 2 - - 0411_1!1996— -_-- 2190_ _ 6163 -3973 -_ -- - _ - � - — - - -- __ <br /> V W-2 04/23/1996 2190 6137 -3947 54 000 _ �<50 8 100 5 600 _ 290 6 500 _ 60 <br /> VW 2 07/02/1996 21 90 6019 3829 20 000 1 400 3 000 1 700 __ 200 _1700 53 <br /> VW-2 10/23/1996 2190 6055 3865 17,000 570 4200 ___ 1300 -- 89 _430_ 43••_ <br /> VW-2 05/29/1997 21 90 5557 3367 15000 <500 2 300 1 600 Y 380 _ 2200 _29 <br /> VW-2 10/17/1997 2190 57 19 -3529 11 000 <500 1800 580---- - 170 870 - 22 <br /> VW-2 12/29/1997 2190 5699 .3509 10000_ 570 1 300 1400 230 1200 <5 <br /> VW 2 _ 03!1611998 2190 5370 -3180 7,400 10000 1 100 860 18_OT_ _ l 100 <5 W <br /> VW-2 _ _ 06/2611998 2190 4987 2797 9 000 <5000 1 400 670 330 ___ 2 100 (<5) <br /> VW-2 09128/1998 21 90 __ 51 75 _ _ _2985 8400 _<5000 _ 1800 530 _ 400 1 900 75(374) <br /> VW 2 12/0211998 21 90- __ _49 89 _2799 7 800 _T 2900 1 100 360_ 290 1 100 38(54) <br /> VW 2 03/31/1999 22 18 46 51 2433 2 100 320 1500 460 750 1 950 83 <br /> Notes <br /> TOC=Top of casing elevation,MSL= Mean Sea Level <br /> TPHG=Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M Laf.cQa-kq <br /> TPHD=Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M <br /> BTEX=Benzene Toluene Ethylbenzene and Total Xylenes by EPA Method 8020 <br /> MTBE=Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> <-Less than method detection Ilmlt <br /> -- = <br /> Not measured sampled tested,or present <br /> 1R72 2ftalwn xb Page 7 of 8 <br />