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s s Page 3 of 3 - Table 1 30-0136 Summary of Ground Water Sampling Former Mobil Bulk Plant 04--345 500 East Grantline Road,Tracy,California i Concentrations in parts per billion(ppb) ilii##aslrii#riiiiriii:riirii�riliiiiwr i!lifi#rliiiii#iiiiiiiiilililil iill!!aliia!!li>9alR3 r!lfai #yelaiLiiia#rli�si ®iliii. #.aalS WELL DATE OF CASING DEPTH GROUND TPH-D TPH-G f3 T EK � � LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION '1'1'1'1#!#i#!iii#!Oi#!iii Riaa�l�liii##ai1l.lSill�##iii�lltiiilai�lltl!liil.##y'tytii! ND< ND<0.3 ND<0.9 ND<0.3 ND<2 --- SAL AW-8 05!07/91 28.46 9,55 18.01 ND<50 ND<50 . SEQ AW-8 08/21/91 28.46 9.48 16.98 ND<50 NDc30 ND<03 0 ND<0.30 ND<0.30 NDcOso --- --- SEG AW-6 11/26/91 28.48 t0.04 18.42 100 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEG AW-8 02/21/92 28.48 9.74 18.72 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 AW-8 04/07/92 26.96 9.74 18.91 ND<50 ND<30 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- -- SEQ SEQ AW-6 04/24/92 28.90 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 ND<0.5 ND<0.5 AW-9 04/07/92 31.28 10.09 21.17 65 72 t5 ND<0.30 5.f 1.3 --- --- SED 4 AW-9 04/24/92 51.26 '10.10 21.16 130 N13<30 5.5 0.35 1.2 0.39 --- --- SEG AW-9 07/21/92 31.26 10.12 21.14 ND<50 ND<50 0.74 ND<0.5 ND<0.5 ND<0.5 -iiiir#iii---r##liiriiisa•ii#r,iii!#iirtii###iraiiirR:i#rrllisii##:r risk #frrilisri##Orrsaiii#�rf�lsiiia EXPLANATION OF ABBREVIATIONS: TPN-D :torn!petroleum hydrocarbons as diesel * :sample reported as not matching typical gasoline pattern TPH-G :rota!petroleum hydrocarbons as gasoline ;sample repOrtsd as not appearing to contain gasolene :s B :benzene ••• ample reported as not appearing b contain dieser T :toluene MPN/1oo ml :most probable number of organisms per 100 ml of water E :ethylbenzene AEL .American EnvkoxmnW Laboratories,Inc. X :total"me CAL :Chrotndab,Inc. NO :not debwW at or above reported deledio limb PACE :Face,Inc. NA :not applicahk/not avallable SAL :Superior Analytical laboratories,Inc. --- :notanalyaedlnotrneasured SEG :SequoiaAnay" Nates: 1. Top of casing elevations were surveyed In nWencs to a railroad spike set In an Island on tits approximate centerline of East Grantllns Road ig.5 femwest from the centerline of the railroad spur racks. 2. Top of casing elevations for AW-1 4trough AW-4 were surveyed by Meodated Professions on October 22,1990. s. Top of casing elevations 1br AW-i t mgh AW-8 were surveyed by Land knp wen*M Services(US)on May 7,1991. 4. Aftw surveying AW-9 on April 9,1092 an elevation error In the May 7,1901 survey was noted;subsequently all wells were surveyed on May 7,1992,by LIS. April 7 and 24,1992 ground water monitoring dein refleet the new survey. 5. Fecal collfarm was anayzed by Kanrwdy/Jenks/CNieon{10/02190);Pace,Inc.(11121!90):Anlab(0¢108/91);and Padflc Environmental Lab.(05107/91). 20-Aug-92