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s � 30-0136 q Table 1 Summary of Ground Water Sampling Former Mobil Bulk Plant 04-343 500 East Grantline Road,Tracy,Califomia Concentrations In parts per billion(ppb) -------- -mm as-----m----z---a-z-z-mzz::seaszzzr-m----z-t-----z--r----m---------z--s---zm mz-:mmmz zzz:::zzz zzz:zzz: WELL DATE OF CASING DEPTH GROUND TPH-D TPH--G B T E X FC Pb LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION -aaa:a-ossa-------r---raaaars av aa-aa----:--------:---xx---m as moa a-sea soca azcraa------:-mz----z:-----a--,-----z-:--------r--- AW-8 05/07/91 28.46 9.55 18.91 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 --- SAL AW-8 08/21/91 28.46 9.48 18.98 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 11/26/91 28.46 10.04 18.42 100 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 02/21/92 28.46 9.74 18.72 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 N0<0.30 --- --- SEO AW-8 04/07/92 28.96 10.05 18.91 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SELL AW-8 04/24/92 28.96 10.03 18.93 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 07/20/92 28.96 10.07 18.89 63 ND<50 ND<0.5 ND<0.5 N0<05 ND<0.5 -- --- SECS AW :8 i412tJ92.......,:';... .......::.1409, NDcQ:S ' ND40,5 ND<Q .. .`ND•CU.S`, »..: .. ; SEQ ww« AW-9 04/07/92 31.26 10.09 21.17 65 72 15 ND<0.30 5.1 1.3 --- --- SEQ AW-9 04/24/92 31.26 10.10 21.16 130 ND<30 5.5 0.35 1.2 0.39 -- - --- SEQ AW-9 07/21/92 31.26 10.12 21.14 ND<50 ND<50 0.74 ND<05 ND<05 ND<0.5 --- SEQ AW :e ...:::....1w �1 .?� � :.: .....: 4� ..::::.:rvDxso:. ....n�osoIdbOslpzas..:....: <da ND � ..... ... ... sQ; z---:---.---zz-z--rzz-s------z--zzz--z-.-z-z: -:- -zzza z:-,za:--mzze-z:::z-:.zzzzz zzz:::zz zzz,mzszzm-auz--s EXPLANATION OF ABBREVIATIONS: TPH--D :total petroleum hydrocarbons as diesel * :sample reported as not matching typical gasoline patbm TPH-G :total petroleum hydrocarbons as gasoline '• ;sample reported as not appearing to contain gasoline B :benzene MPN/100 ml :most probable number of organisms per 100 ml of water T :toluene AEL ;American Environmental Laboratories,Inc. E :ethyibenzene CAL :Chromalab,Inc. X :total xylenes PACE ;Pace,Inc. ND :not detected at or above reported detection limits SAL :Superior Analytical Laboratories,Inc. NA :not applicable/not available SEQ :Sequoia Analytical --- :not analyned/notmeasured Notes: 1. Top of casing elevations were surveyed in reference to a railroad spike set In an island on the approximate centerline of East Grantlkte Road 19.5 feet west from the centerline of the railroad spur tracks, 2. Top of casing elevations for AW-1 through AW-4 were surveyed by Associated Professions on October 22,1990. 3. Top of casing elevations for AW-1 through AW-8 were surveyed by Land Improvement Services(US)on May 7. 1991. 4. After surveying AW-9 on April 9.1992 an elevation error in the May 7.1991 survey was noted;subsequently all wells were surveyed on May 7. 1992,by US. April 7 and 24.1992 ground water monitoring data reflect the new survey. h S. Fecal coliform was analyzed by Kennedy/Jenks/Chilton(10/02/90); Pace.Inc.(11/21/90);Anlab(02/06/91);and Pacific Environrmentai Crab.(05/07/91). i! I 9 f:Iusere\stephantAdoclpro)ect10136N1092grty 23-Nov-92 Page 3 of 3 I