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TABLE 2 - CONTINUED Analytical Results of Ground Water Samples - SIERRA LUMBER 375 West Hazelton Avenue, Stockton, California Well Ground Screen Ethyl- MTBE MTBE I D Date Water Interval TPH-g Benzene Toluene benzene Xylenes 8020 8260 D1PE TAME ETRE TBA D th ft bs 08-25-98 16 17 ND<50 ND<O 5 N1<0 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND 09-16-98 1659 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 NIX5 ND<1 ND<1 ND<1 ND<1 ND<5 12-10-98 1716 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 MW-5 03-15-99 1598 10 to 35 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 06-22-99 1660 ND<50 14 74 19 95 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 09-10-99 1760 ND<50 ND<0 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<l ND<1 ND<5 04-28-00 1580 ND<50 ND<O 5 ND<O 5 NIXO 5 ND<0 5 ND<5 ND<1 ND<1 ND<l ND<1 ND<5 _ 08-25-98 1789 i 480 78 59 11 098 ND<5 ND<1 094 ND<1 ND<1 94 ' 09-16-98 1903 160 33 093 085 092 ND<5 ND<l ND<1 ND<l ND<1 ND<5 12-10-98 1943 200 ND<O 5 ND<O 5 16 ND<O 5 ND<5 ND<1 ND<1 ND<l ND<1 ND<5 MW-6 03-15-99 1791 10 to 35 120 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<l ND<l ND<1 ND<1 ND<5 06-22-99 1810 86' ND<O 5 25 ND<O 5 082 ND<5 ND<l ND<1 ND<1 ND<1 7 09-10-99 1917 93' ND<O 5 ND<0 5 ND<O 5 ND<0 5 ND<5 ND<l ND<1 ND<l ND<l ND<5 04-28-00 1746 1 130' ND<O 5 29 ND<O 5 071 ND<5 ND<1 ND<1 NIX1 ND<1 20 08-25-98 1803 N11<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 09-16-98 1843 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 12-10-98 1921 ND<50 ND<O 5 ND<0 5 ND<0 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 MW-7 03-15-99 1776 9 to 34 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<O 5 ND<5 ND<l ND<1 ND<1 ND<1 ND<5 06-22-99 1850 ND<50 065 2 ND<O 5 19 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 09-10-99 1943 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<5 ND<1 ND<1 ND<1 ND<l ND<5 04-28-00 1763 ND<50 ND<O 5 ND<0 5 ND<O 5 N1<0 5 ND<5 ND<1 ND<1 ND<1 ND<1 10 06-22-99 1750 110` 1 I 23 ND<O 5 4 ND<5 53 ND<1 ND<1 ND<1 67 MW-8 09-10-99 1857 15 to 35 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 34 47 ND<l ND<1 ND<5 04-28-00 1673 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<5 19 19 ND<1 ND<1 82 EW-1 07-16-99 - 15 to 45 96,000 5 600 13 000 1 800 10.000 ND<1000 - - Notes , All units reported as ugll(micrograms per liter or parts per billion) TPH-g total petroleum hydrocarbons quantified as gasoline DIPE di-isopropyl ether,ETRE ethyl tertiary butyl ether,TAME ternary amyl methyl ether,TBA tertiary butanol alcohol,MTBE methyl tertiary butyl ether ND not detected unmodified or weakly modified gasoline is significant z heavier gasoline range compounds are significant 3 one to a few isolated peaks are significant,no recognizable pattern < indicates constituents were not detected at a concentration greater than the reporting limit shown Laboratory analysis up to 04/21/97 reported by John P Cummings&Associates in Quarterly Report,dated 21 November 1997 Advanced GeoEnvironmental,ina I e _ 6