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• T& 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 DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L u IL (u IL) ((ug/L u IL ug--IL ug 1L (ug/L u 1L u IL u IL1(ugll-) uIL feet (feet msl feet msl Comments AS-1 10/26/99 1700 100 77 26 27 50 <0 50 <0 50 <0 50 <50 <50 200000 56 <0 50 6094 nm nm no odor 1 no sheen screened 03/03/00 <200 80 <20 32 <20 11 <20 <2 0 <2 0 <20 <0 50 69000 <20 <2 0 5551 nm no odor 1 no sheen Interval 06/22/00 <200 83 28 32 42 10 <2 0 <2 0 <20 <20 <200 55000 <20 <2 0 5484 nm no odor!no sheen 70 5-75 5' 09/28100 200 53 12 19 21 10 na no no no no na no no 5663 nm no odorno sheen 12/22100 96 2 0 1 1 <0 50 062 32 no no na no na no no no 5651 nm no odorno sheen 03/28101 1200 70 220 28 120 <10 na na no no no no no no 56 02 nm no odor/no sheen 06/27101 600 21 43 14 19 11 1010 <0 50 <0 50 76 <50 13000 14 <0 50 5680 nm no odor 1 no sheen 09/06101 610 19 35 14 32 68 no no no no no no na na 5881 nm no odor 1 no sheen 12/04/01 4900 540 350 170 880 <25 na na na no na na no no 5927 nm no odor 1 no sheen 03/01102 690 55 33 14 77 51 no no no na no na no na 5855 nm no odor 1 no sheen 05/20102 2000 140 150 43 170 5 0 <0 50 <0 50 <0 50 <5 0 <2500 12000 13 <0 50 5839 2793 30 46 no odor!no sheen 08/30102 550 21 16 6 5 19 80 na no no no no no no no 61 45 -3352 no odor 1 no sheen 12/06/02 9800 2000 1300 290 1700 <10 no no no no no no no no 61 35 -3342 odor/no sheen 03107/03 4700 720 430 110 550 <25 no na no no no na no na 6081 -3288 odorino sheen 06/03103 2600 460 280 67 350 4 6 <2 0 <20 <2 0 <20 <200 4000 <20 <20 5973 -3180 odorino sheen 08/29103 <250 88 5 8 <2 5 37 <25 no no na na no no na no 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 03/01104 18000 20 18 <10 <10 <10 <10 <10 <10 <100 <1000 1300 <10 <10 61 37 25 84 3553 no odor 1 no sheen 06108104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6177 3593 not sampled 09/09/04 4300 9 1 9 3 1 7 9 2 <10 no na no no no na no no 6350 -37 66 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 AS 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 474gmr65 As P[gect No 1474 48 Page 14 of 18 HORIZOF EAVIRONMUTAL IFC