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i Tab* • Groundwater Monitoring Data Beacon Station No.474 3443 East Main Street,Stockton,California Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Number ug/L ug/L ug/L ug/L ug/L ug/l ug/L ug/L ug/L Comments MW-1 03/31/98 <5.0 na na na na na na screen 06/10/98 ns ns ns ns ns ns ns no comment interval 09/08/98 ns ns ns ns ns ns ns no comment 75'-90' 12/30/98 ns ns ns ns ns ns ns no comment 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <030 <5.0 <50 <5.0 <0.50 <0.50 no comment 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 no comment 12/10/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 no comment MVH.-2 03/31/98 <25.0 na na na na na na screen06/10/98 ns ns ns ns ns ns ns no comment interval 09/08/98 ns ns ns ns ns ns ns no comment 76'91.5' 12/30/98 ns ns ns ns ns ns ns no comment 03/25/99 0.62 <0.50 <0.50 <0.50 6.1 <50 25 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 no comment 08/30/99 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 no comment 12/10/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <100 <5.0 <5.0 no comment MW-,-3 0313I/98 <5.0 na na na na na na screen 06/10/98 ns ns ns ns ns ns ns no comment interval 09/08/98 ns ns ns ns ns ns ns no comment 75'-90' 12/30/98 ns ns ns ns ns ns ns no comment 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 88 <0.50 no comment 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 80 <0.50 no comment 12/10/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 60 <0.50 no comment MWA4 03/31/98 ns ns ns ns ns ns ns not located sereert 06/10/98 ns ns ns ns ns ns ns not located interval 09/08/98 ns ns ns ns ns ns ns not located 65'=86' 12/30/98 ns ns ns ns ns ns ns Paved over 03/25/99 ns ns ns ns ns ns ns ns ns Paved over 08/30/99 ns ns ns ns ns ns ns ns ns Paved over 12/10/99 ns ns ns ns ns ns ns ns ns Paved over 99QMtable.Q4 Page 1 of 3 HORIZON ENVIRONMENTAL INC.