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r r rt r Mom7oring Report:7500 West Eleventh Street,Tracy,CA Well Date TPHd TPHg Benzene Toluene Ethyl- Total TBA MTBE TAME DIPE ETRE 1,2-DCA EDB Ethanol Lead No. Sampled benzene Xylenes µg/L µg/L 9911- µg/L µ91L Pg'- po/L µg/L µ91L µg/L µg/L µg/L µg2 µ9/L mg/L MW-16 04/30/04 ND 15 938 ND ND ND ND 5.3 100 0.79 ND ND n/a nla n/a n/a 07/27/04 618 97' ND ND ND ND 8.1 140 0.98 ND ND nla n/a nla nla 10/27/04 ND 76 ND ND ND NO ND 38 ND ND NO ND n/a n/a nla nla MW-17 04/30/04 NO 15 ND ND ND ND NO ND NO ND ND NO n/a nla n/a n/a 07/26/04 NO 15 ND ND ND ND NO ND ND ND ND ND nla nla n/a nla 10/27/04 NO 15 ND ND ND ND ND NO ND NO ND ND n/a nla n/a nla MW-18 04/30/04 ND 15 518 ND NO NO ND ND 60 ND ND ND nla nla nla nla 07/27/04 ND 16 ND ND ND NO ND NO 36 ND ND ND nla n/a n/a n/a 10/28/04 ND 75 5120 NO ND NO NO NO 52 ND ND ND n/a nla n1a nla MW-19 04/30/04 NO 15 ND ND ND ND ND ND ND ND NO NO nla n/a n/a n/a 07/26/04 NO 15 ND ND 0.63 �2 ND 1.5 22 ND ND ND NO ND n/a n/a n/a nla 10/27/04 NO 75 NO ND NO NO NO ND NO ND ND NO n/a n1a n/a nla Notes: (1) Chromatogram Pattern:Unidentified Hydrocarbons<C16 (2) Chromatogram Pattern:Unidentified Hydrocarbons?C16 (3) Chromatogram Pattern:Unidentified Hydrocarbons C9-C24 (4) Chromatogram Pattern:Gasoline C6-C12 (5) ND=Not Detected above the Method Detection Limit(MDL). (6) nla=not analyzed (7) Hydrocarbon reported does not match the pattern of the laboratory's Diesel standard. (8) Hydrocarbon reported does not match the pattern of the laboratory's gasoline standard. (9) Hydrocarbon reported is in the late Diesel range,and does not match the laboratory's Diesel standard (10) Sample contains discrete peak in addition to gasoline. (11) Floating Product in well. (12) Laboratory reported 130µg/L of an organic analyte which is NOT a fuel hydrocarbon in sample. (13) Laboratory reported 100µg1L of an organic analyte which is NOT a fuel hydrocarbon in sample. (14) Laboratory reported 100µg/L of an organic analyte which is NOT a fuel hydrocarbon in sample. (15) Sample aliquot treated with silica gel before analysis for diesel range compounds. (16) Sample aliquot filtered before analysis for diesel range compounds. (17) nls=Well Not Sampled (18) Hydrocarbon reported is in the early Diesel range,and does not match the laboratory's Diesel standard (19) Laboratory reports that quantity of unknown hydrocarbons in sample based on diesel (20) Laboratory reports that the concentration reported reflects individual or discrete unidentified peaks not snatching a typical fuel pattern. (21) Laboratory reported 54µg/L of an organic analyte which is NOT a fuel hydrocarbon in sample. (22) Laboratory reported quality assurance issues related to some analyses of Sample MW-19.Results cited are judged to be spurious. Page 7 of 7 Groundwater Analyses sic