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GROUNDWATER MONITORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date WWI-) (ug/L u 1L u 1L (ug/L u 1L u 1L u 1L u 1L u !L u IL (ug/L (ug/L (ug/ feet (feet ms!) (feet ms1 Comments AS-1 10/26/99 1700 100 77 26 27 50 <0 50 <0 50 <0 50 <5 0 <50 200000 56 <0 50 6094 nm nm no odor!no sheen screened 03103/00 <200 80 <20 32 <2 0 11 <20 <2 0 <2 0 <20 <0 50 69000 <2 0 <20 5551 nm no odor!no sheen Interval 06/22/00 <200 83 28 32 42 10 <2 0 <2 0 <2 0 <20 <200 55000 <2 0 <2 0 5484 nm no odor!no sheen 70 5-75 5' 09/28/00 200 53 1 2 19 21 10 na na na na na na na na 5663 nm no odor 1 no sheen 12/22100 96 20 1 1 <0 50 062 32 na na na na na na na na 5651 nm no odor Ino sheen 03!28101 1200 70 220 28 120 <10 na na na na na na na na 5602 nm no odor 1 no sheen 06/27101 600 21 43 34 39 77 <0 50 <0 50 <0 50 76 <50 13000 14 <0 50 5680 nm no odor 1 no sheen 09/06/01 610 19 35 14 32 68 na na na na na na na na 5881 nm no odor!no sheen 12/04/01 4900 540 350 170 880 <25 na na na na na na na na 5927 nm no odor!no sheen 03/01102 690 55 33 14 77 51 na na na na na na na na 5855 nm no odor1 no sheen 05/20/02 2000 140 150 43 170 50 <0 50 <0 50 <0 50 <5 0 <2500 12000 1 3 <0 50 5839 2793 -3046 no odor 1 no sheen 08130102 550 21 16 65 19 80 na na na na na na na na 61 45 -3352 no odor l no sheen 12/06/02 9800 2000 1300 290 1700 <10 na na na na na na na na 61 35 3342 odorino sheen 03/07/03 4700 720 430 110 550 <25 na na na na na na na na 6081 3288 odor/no sheen 06/03103 2600 460 280 67 350 46 <2 0 <2 0 <20 <20 <200 4000 <2 0 <2 0 5973 -3180 odor/no sheen 08/29103 <250 88 58 <2 5 37 <25 na na na na na na na na 61 83 -3390 no odor 1 no sheen 11/25/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6261 -3468 not sampled 03/01/04 18000 20 18 <10 <10 <10 <10 <10 <10 <100 <1000 1300 <10 <10 61 37 2584 -13553 no odor 1 no sheen 06/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 77 3593 not sampled 09/09/04 4300 91 93 17 92 <10 na na na na na na na na 6350 -3766 no odor 1 no sheen 12108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6356 3772 not sampled 03/10/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05/25/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 17 -3533 not sampled 09/02/05 1200 78 110 26 150 <5 0 na na na na na na na na 6497 -3913 odorino sheen I I 474gnW5 xis Protect No 147446 Page 14 of 18 HORIZON ENVIRONMENTAL INC