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i 30-0136-01 TABLE 1 Summary of Results of Ground Water Monitoring and Sampling Former Mobil Oil Bulk Plant 03-343 500 East Grantline Road, Tracy, California Concentrations in parts per billion (ppb) sox-szxxosaxazzsxas=xxa=zzxssszxzsazszrsz=xaszzsasszsxzzzzssassx_szxszaazaxzzzzauzsass:ssassssssss::a_xsazssssaszxazRsszsszzzxxaaa szx�saxxsa WELL DATE OF TOP OF DEPTH GROUND TPH-G TPH-D B T E % ORGANIC FECAL LAB LEAP COLIFORM ID SAMPLING/ CASING TO WATER MPH/100010MONITORING ELEVATION WATER ELEVATION sszzzzzszazzzzzzzaz=zz3sz7zszamzssz2zzzazzsszzsszxzzzxszszamz�sszzzazszsssizzzszzsaxFztzsasazxsszsxaazzxxxas:zzzaz:xs:sszszsa:xszzszsssa:szz::szzs::ssszaexsss 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<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 11/26/91 28.46 10.04 18.42 ND<30 100 *** 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<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 04/07/92 28.96 10.05 18.91 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-8 04/24/92 28.96 10.03 18.93 ND-c30 ND<50 10<030 ND<0.30 ND<0.30 ND<0.30 SEQ AW-9 04/07/92 31.26 10.09 21.17 72 65 15 ND<0.30 5.1 1.3 --- --- SEQ AW-9 04/24/92 31.26 10.10 21.16 ND<30 130 5.5 0.35 1.2 0.39 --- --- SEQ EXPLANATION OF ABBREVIATIONS: TPH-D :total petroleum hydrocarbons quantified as diesel :sample reported as not Matching typical gasoline pattern TPN-G :total petroleum hydrocarbons quantified as gasoline ** :sample reported as not appearing to contain gasoline 6 .benzene *** :sample reported as not appearing to contain diesel T :toluene MPN/100ml :most probable number of organisms per 100 ml of water E :ethylbenzene AEL :American Environmental Laboratories, Inc. CAL :Chromalab, Inc. K :total xylenes PACEND :not detected PACE :Pace, Inc. NA :not applicable/not available SAL :Superior Analytical Laboratories, Inc. --- :not analyzed/not measured SEQ :Sequoia Analytical Notes: 1. Top of casing elevations were surveyed in reference to a railroad spike set in island on the approximate centerline of East Grantline 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 (LIS) on May T. 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 resurveyed on May 7, 1992 by LIS. April 7 and 24, 1992 ground water monitoring data reflect the new survey. 5. Fecal coliform analyzed by Kennedy/Jenks/Chilton (10/02/90); Pace, Inc. (11/21/90); Anlab (02/06/91): and Pacific Environmental Lab. (05/07/91). �I 15-May-92 Page 3 of 3 i