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TO . 'r GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol OCA EDB GW Elevation Elevation Number Date u 1L) (ug/L (ug/L u 1L (u4Q u IL u 1L) (u !L) (u 1L) ((ug/L u L) (u !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!30198 1500 73 18 160 64 <25 0 no no no no no no no no 4559 -2494 slight odor lno sheen Interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 no no 4139 -2074 no odor I no sheen 41 66 06102/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 -2009 no odor!no sheen 0&31199 2400 140 2 1 460 280 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 -2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <50 1 3 1050 4726 2661 02121/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 -2516 slight odor 1 no sheen 05118/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <50 no no 4089 2024 slight odor!no sheen 09!26!00 680 1 1 <0 50 3 1 087 <50 no no no no no no no no 4895 -2830 slight odor!no sheen 12121100 1400 16 1 1 40 120 <50 no na no no no no no na 4762 -2697 slight odor I no sheen 03127101 1700 61 14 23 220 <50 no no no no no na no no 4637 -2572 slight odor 1 no sheen 06125!01 390 5 1 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <50 68 <0 50 4899 -2834 slight odor 1 no sheen 09105/01 410 1 1 <0 50 <0 50 46 <50 no no no no no no no no 5411 3346 no odor!no sheen 11!30101 750 72 14 31 15 <50 no no no no na na no no 5411 3346 no odor I no sheen 02127102 850 12 35 1 4 23 <50 no no no no na no no no 5078 3013 no odor I no sheen 05!16102 1100 72 10 31 67 <0 50 to 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 -2871 no odor!no sheen 09113102 2800 110 33 130 200 <50 na no no no no no no no 5908 3687 slight odor I no sheen 12104!02 980 31 15 21 39 <50 no no no no no no no no 5734 -35 13 odor Ino sheen 02!17103 900 20 14 42 26 <0 50 no no no no no no no na 5408 -31 87 no odor/no sheen 06103103 2800 140 17 130 120 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 5347 -3126 no odor I no sheen 09!18103 2800 430 23 79 170 <50 no no na no no no no no 5991 -3770 no odor 1 no sheen 11124103 1800 190 27 19 76 <0 50 no no no no no na no no 5866 -3645 no odor!no sheen 02123104 1200 40 075 77 59 <0 50 <0 50 <0 50 <0 50 67 <50 <5 0 26 <0 50 5515 -3294 odor!no sheen 06!07104 2200 420 57 44 92 <10 no no no no no na no no 5557 -3336 odor Ino sheen 09107/04 1800 230 25 51 140 <1 5 no no no no na no no no 6196 3975 odor Ino sheen 12!10104 2100 290 13 23 37 <50 no no no no na no no no 5961 3740 odor 1 no sheen 03109!05 1000 12 <0 50 21 14 <0 50 <0 50 <0 50 <0 50 65 <50 <50 29 <0 50 56 00 3379 odor I no sheen 05/24105 830 20 061 45 <0 50 <50 no no na no no no no no 51 11 -2890 odor 1 no sheen 419gnr05 llh ProjW N. 141948 Page 9 of 13 HORIZON ENVIRONMENTAL INC