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y i TABLE 3A QUARTERLY MONITORING DATA Beacon Station No. 474 Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Number -EEL u u u ugIL u ugtL ugLL u Comments MW4 03/31/98 ns ns ns ns ns ns ns not located screen 06/10/98 ns ns ns na ns ns ns not located interval 09/08/98 ns na ns ns ns ns ns not located 65'416' 17/30/98 ns ns ns ns ns ns ns Paved over 03/15/99 ns no as na ns ns ns ns ns Paved over 08/30/99 na ns ns ns ns ns ns ns ns Paved over 12/10/99 ns ns ns ns ns ns ns as ns Paved over 03/03/00 ns ns ns ns ns ns ns ns ns no comment MW-5 03/31/98 <5.0 na na na na na na screen 06/10/98 <5.0 na na na na na na no odor/no sheen Interval 0910$/98 <0.50 IC50 <0.50 <0.50 <5.0 <5.0 <5.0 no odor/no sheen 65'-86.3' 12/30/98 <5.0 na na no na na na no odor/no sheen 03/25/99 <0.50 <0.30 <0.50 <0.50 <5.0 <50 <5.0 no comment 06/03/99 <0.50 x.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 12/10/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 no comment 03/03/00 <0.50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 no odor/no sheen MW-6 03/31/98 <500 na na na na na na reported as MW-2A screen 06/10/98 <500 na 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 <5.0 odor/no sheen 56'-76' 12130/98 <250 no na na na na m slight odor/no sheen 03125/99 <0.50 <0.50 <0.50 <0.50 20 <50 56 no comment 06/03/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 no continent 08/30/99 42 40 <20 <20 X200 <2000 <200 32 56 no comment 12/10/99 40 <20 <20 40 <200 <5000 400 68 46 no comment 03/03/00 <20 40 <20 <20 <200 <2000 <200 <20 <20 no odor/no sheen MW-7 03/31/98 <5.0 na na na na na na screen 06/10/98 <5.0 na 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 <5.0 no odor/no sheen 56'-76' 12/30/98 <5.0 na na na na na na no odor I no sheen 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 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 12/10199 0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.7 <0.50 no comment 03/03/00 0.62 <0.50 <0.50 <0.50 <5.0 <W <5.0 5.0 <0.50 no odor/no sheen g"mdata.xls 1474.22rpt Page 2 of 4 HORIZON ENVIRONMENTAL. INC.