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Extended Site Characterization 7500 West Eleventh Street, Tracy, CA RESULTS OF ANALYSES OF SAMPLES OF GROUNDWATER RECOVERED FROM SMALL DIAMETER BORINGS Sample Date TPHd TPHg Benzene Toluene Ethyl- Total TBA MTBE TAME DIPE ETBE 1,2-DCA EDB Lead No. Sampled benzene Xylenes µg& µg/L µg/l- pg/L pg/L pg/L µg/l- µg/l- �Lg/L pg/L gg/L pg/L pg/L mg/L Tank Pit 12/10/98 210,000 55,000 1,000 2,300 760 4800 n/a 24,000 n/a n/a n/a n/a n/a n/a No. 1 PP-1 4124100 1202 ND ND ND ND ND n/a n/a n/a n/a n/a n/a nla n/a PP-2 4124100 190 300 4 0.78 ND 3.5 ND nla n/a nla n/a n/a n/a n/a n/a PP-3 4124100 14000 ' 16004 120 8.0 110 260 n/a n/a nla n/a n/a n/a n/a n/a PP-4 4124100 4001 8804 42 51 47 180 n/a n/a n/a n/a n/a n/a nla n/a PP-5 4124/00 560 ' 1100 4 13 67 69 260 n/a n/a n/a n/a n/a n/a n/a n/a PP-6 4124100 NO ND ND ND ND ND n/a n/a n/a n/a n/a n/a n/a nla PP-7 4/25100 25200 11000 4 ND ND 80 75 n/a n/a n/a n/a n/a nla n/a n/a PP-8 4125100 1453 ND NO ND ND NO nla n/a n/a n/a n/a n/a n/a n/a PP-9 4125100 256 5 ND NO ND ND ND n/a n/a n/a n/a n/a n/a n/a n/a PP-10 4125100 81.6 5 904 0.72 ND 0.52 ND n/a n/a n/a n/a n/a n/a n/a n/a PP-11 4125100 3075 ND 0.58 ND NO ND n/a n/a n/a n/a n/a n/a n/a n/a PP-12 4125100 2735 ND ND ND ND NO n/a n/a n/a n/a n/a n/a nla n/a PP-13 4125/00 383 5 NO 1.6 ND ND ND n/a n/a n/a nla n/a n/a n/a n/a PP-14 4125100 3555 ND 3.4 4.1 1.6 6.7 n/a n/a n/a n/a n/a n/a n/a nla PP-15 3/25102 1,100 6 63 ND ND ND ND ND 90 ND ND ND n/a n/a nla PP-16 3/27102 89 6 ND NO ND ND ND ND 120 NO ND ND n/a n/a n/a Notes: (1) Chromatogram Pattern: Unidentified Hydrocarbons <C16 (8) ND = Not Detected above the Method Detection Limit(MDL). (2) Chromatogram Pattern: Unidentified Hydrocarbons >C16 (9) n/a= not analyzed (3) Chromatogram Pattern: Unidentified Hydrocarbons C9-C24 (4) Chromatogram Pattern: Gasoline C6-C12 (5) Hydrocarbons present are a complex mixture of diesel range and heavy oil range organics. (6) Hydrocarbon reported does not match laboratory's Diesel standard. (7) Hydrocarbon reported in the gasoline range does not match laboratory's gasoline standard. SJC