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i TA1*1 • 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 DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date ug/L) (u IL) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 9 11/12198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey screened 12/30/98 1500 73 18 160 64 <25 0 no no no no na no no no 4559 2494 slight odor I no sheen interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 45 0 no no 41 39 2074 no odor/no sheen 41 66 06/02/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 2009 no odor I no sheen 08/31/99 2400 140 2 1 460 280 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 2497 no comment 12109/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 4726 2661 02121/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 25 16 slight odor/no sheen 05118/00 790 96 081 76 2 1 <0 50 <0 50 <0 50 <0 50 12 <50 <50 na no 4089 2024 slight odor/no sheen 09!26100 680 1 1 <0 50 31 087 <5 0 na na na na no na no no 4895 2830 slight odor I no sheen 12121100 1400 16 1 1 40 120 <5 0 no na no no no no na no 4762 2697 slight odor 1 no sheen 03127101 1700 61 14 23 220 <5 0 no na na no na no na no 4637 2572 slight odor/no sheen 06126101 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 2834 slight odor 1 no sheen 09/05101 410 1 1 <0 50 <0 50 46 <50 no no no no no na no na 54 11 3346 no odor/no sheen 11/30101 750 72 14 31 15 <5 0 no na no no na no na no 54 11 3346 no odor/no screen 02/27102 850 12 35 14 23 <50 no no na no no na na na 5078 30 13 no odor/no sheen 05/16/02 1100 72 10 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odor 1 no sheen 09/13/02 2800 110 33 130 200 <5 0 no no no no no no no As 5908 3687 slight odor I no sheen 12/04/02 980 31 15 21 39 <5 0 no na no na no no no no 5734 35 13 odor Ino sheen 02117/03 900 20 14 42 26 <0 50 na na no no na no na no 5408 3187 no odor)no sheen 06/03/03 2800 140 1 7 130 120 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 5347 3126 no odor)no sheen 09118103 2800 430 23 79 170 <5 0 na no no na no na na no 5991 3770 no odor I no sheen 11/2Q03 1800 190 27 19 76 <0 50 no no na no na no na no 5866 -3645 no odor/no sheen 02/23104 1200 40 075 77 59 <0 50 <0 50 <0 50 <0 50 67 <50 <5 0 26 <0 50 5515 3294 odor 1 no sheen 06/07104 2200 420 57 44 92 <10 no na no no na na na no 5557 3336 odor I no sheen 09/07104 1800 230 25 51 140 <1 5 no na na no no na no na 6196 3975 odor I no sheen 12/10104 2100 290 13 23 37 <5 0 no no na no no no no na 5961 3740 odor no sheen 03/09/05 1000 12 <0 50 21 14 <0 50 <0 50 <0 50 <0 50 65 <50 <5 0 29 <0 50 5600 -3379 odor I no sheen I 419pmA5 afa PrGjmt No 141948 Pago 9 of 13 HORIZON HRVIRoa uzxTAL[8c