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TABLE 2 - CONTINUED Analytical Results of Ground Water Samples SIERRA LUMBER 375 West Hazelton Avenue, Stockton, California Ground Screen Well Date Water interval TPH-g Benzene Toluene Ethyl- Xylenes MTBE MTBE RIPE TAME ETRE IBA I D De th ft bs benzene 8()20 _ 8260 08-25-98 16 17 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 09-16-98 1659 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<O 5 ND<5 ND<1 ND<1 ND<l NfXl ND<5 12-10-98 1716 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-5 03-15-99 1598 10 to 35 ND<50 ND<O 5 ND<0 5 ND<O 5 ND<O 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 j 09-10-99 1760 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<l ND<5 04-28-00 1580 ND<50 ND<0 5 ND<O 5 NIKO 5 ND<O 5 ND<5 ND<l ND<1 ND<l ND<l ND<5 08-25-98 1789 480 78 59 1 1 098 ND<5 ND<1 094 ND<1 ND<l 94 09-16-98 1903 160 33 083 095 092 ND<5 ND<1 ND<1 ND<l ND<1 ND<5 12-10-98 1943 200 ND<O 5 ND<0 5 16 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 j MW-6 03-15-99 1791 10 to 35 120 ND<O 5 ND<O 5 ND<0 5 ND<O 5 ND<5 ND<1 ND<1 ND<l ND<1 ND<5 06-22-99 1810 86' ND<O 5 25 ND<O 5 082 ND<5 ND<1 ND<1 ND<1 ND<1 7 09-10-99 1917 93' ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<1 ND<5 0428-00 1746 130' ND<O 5 29 ND<O 5 071 ND<5 ND<1 ND<1 ND<1 ND<1 20 08-03-00 1990 1 110 ND<0 5 2 i 1 ND<O 5 ND<O 5 ND<5 I ND<1 NIXI ND<1 ND<1 I ND<5 08-25-98 1803 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 09-16-98 1843 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<5 ND<1 ND<l ND<1 ND<l ND<5 12-10-98 1921 NLK50 ND<0 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 NrX1 ND<5 MW-7 03-15-99 1776 9 to 34 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<1 ND<1 ND<1 ND<l ND<5 06-22-99 1850 ND<50 065 2 ND<O 5 19 ND<5 ND<1 ND<l ND<l 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<1 ND<5 04-28-00 1763 ND<50 1413<0 5 ND<O 5 ND<O 5 ND<0 5 ND< ND<1 ND<1 ND< ND<1 10 06-22-99 1750 110, 1 l 23 ND<O 5 4 ND<5 53 ND<1 ND<l ND<1 67 MW-8 09-10-99 1857 15 to 35 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<0 5 ND<5 34 47 ND<1 ND<1 ND<5 04-28-00 1673 ND<50 ND<0 5 ND<O 5 ND<0 5 ND<O 5 ND<5 19 19 ND<1 ND<1 82 EW-1 07-16-99 15 to 45 96 000 5 600 13 000 1800 10 000 ND<1000 Notes All units reported as ugll(micrograms per Mer or parts per billion) TPH-g total petroleum hydrocarbons quantified as gasoline DIPS di-isopropyl ether,ETBE ethyl tertiary butyl ether,TAME tertiary amyl methyl ether,TBA tertiary butanol alcohol,MTBE methyl ternary butyl ether ND not detected ' unmodified or weakly modified gasoline is significant z heavier gasoline range compounds are significant ' one to a few isolated pears are significant,no recognizable pattern < indicates constituents were not detected at a concentration greater than the reporting limit shown Laboratory analysis up to 04121197 reported by John P Cummings&Associates in Quarterly Report,dated 21 November 1997 Advanced GeoEnvirronmental,Ina