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i! Table I a-Groundwater Monitoring Data Beacon Station No.474 3443 East Main Street,Stockton,California I Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Number u u u ugj u u u u u Comments MW-5 03/31/98 <5.0 na na na na na screen 06/10/98 <5.0 na na na na na no odor 1 no sheen interval 09/08/.98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no odor/no sheen 65'-86.5' 12/30/98 <5.0 na na na na na no odor/no sheen 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <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 MW-6 031311,98 <500 na na na na na reported as MW-2A screen 06110/,98 <500 na na na na na reported as MW-2A interval 09/08/98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 odor/no sheen 56'-76' 12/30/98 <250 na na na na na slight odor/no sheen 03/25/99 <0.50 <0.50 <0.50 <0.50 20 56 no comment 06/03/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 no comment 08/30/99 42 40 40 40 400 4000 400 32 56 no comment MW-7 03/31/98 <5.0 na na na na na screen 06/10/98 <5.0 na na na na na no odor/no sheen interval 09/08/98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no odor/no sheen 56'-76' 12/30/98 <5.0 na na na na na no odor/no sheen 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.6 <0.50 no comment 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 2.1 <0.50 no comment MW-8 03/31/98 <5.0 na na na na na reported as MW-3A screen 06/10/99 <5.0 na na na na na reported as MW-3A interval 09/09/98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 slight odor/no sheen 56'-76' 12/30/98 <5.0 na na na na na slight odor/no sheen 03/25/99 <0,50 <0.50 <0.50 <0.50 <5.0 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <�0 <5.0 <0.50 <0.50 no cottunent 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 no comment i k 990MT@ble.03 Page 2 of 3 HORIZON ENVIRONMENTAL INC. i 4 i