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TA 1 ti GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW5 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4846 2043 2803 screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4272 -2229 interval 09/08/98 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4692 -2649 no odor!no sheen 48'-71' 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2043 wellhead survey 12/30/98 110 067 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4545 -2502 no odor 1 no sheen 03/26/99 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 41 26 2083 no odor 1 no sheen 06/02/99 60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <60 <50 <50 71 <0 50 4061 2018 no odor 1 no sheen 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 16 <0 50 4549 2506 no comment 12109/99 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 200 <0 50 4704 2661 02121!00 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 190 <0 50 4547 2504 no odor 1 no sheen 05/18/00 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 na na 4071 2028 no odor 1 no sheen 09126/00 64 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4882 -2839 no odor/no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <60 na na na na na na na na 4741 -2698 no odor!no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4619 2576 no odor!no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 16 <0 50 4876 2833 no odor I no sheen 09/05101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5379 -3336 no odor I no sheen 11/30101 <50 <0 50 <0 50 <0 50 <o 50 <5 0 na na na na na na na na 53 88 -3345 no odor/no sheen 02127/02 <50 <0 50 062 <0 50 <0 50 <5 0 na na na na na na na na 5052 3009 no odor!no sheen 05/16102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 14 <0 50 5062 2199 2863 no odor/no sheen 09/12102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5857 3658 no odor/no sheen 12/04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5711 3512 no odor!no sheen 02/17/03 57 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5403 -3204 no odor I no sheen 06102/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 c0 50 <0 50 <0 50 <5 o <50 <5 0 30 <0 50 5317 31 18 no odor 1 no sheen 09118/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns AS ns ns ns ns ns ns AS ns 5833 3634 not sampled 02/23104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 c5 0 <50 <50 22 <0 50 5484 3285 no odor I no sheen I 419gmr04 xls Project No 1419 47 Page 5 of 13 HORIZON ENVIRONMENTAL INC