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To 1 ' GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xy$enes MTBE DIPE ETBE TAME TBA methanol ethanoi DCA EDB GW Elevation Elevation Number Date (ug1L) (ugIL) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (ugIL) (ugIL) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 10 12/02/98 as ns as ns as ns ns ns as ns ns ns ns ns 2087 wellhead survey screened 12/30/98 180 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4584 -2497 no odor 1 no sheen interval 03/26/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 4165 2078 no odor 1 no sheen 41 -66 06/02199 160 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 4096 2009 no odor 1 no sheen 08131199 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 2487 no comment 12!09199 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 4746 2659 no comment 02/21!00 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4591 2504 no odor 1 n0 sheen 05/18/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 41 11 2024 no odor/no sheen 09126/00 ns ns ns AS ns as ns ns ns ns ns ns ns ns nm nm well access blocked 12/20/00 <50 <0 50 70 <0 50 <0 50 <5 0 na na na na na na na na 4789 2702 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 4762 2675 no odor!no sheen 06126/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4905 28 18 no odor!no sheen 09105/01 <50 <0 50 1 4 <0 50 <0 50 <5 0 na na na na na na na na 5405 -33 18 no odor I no sheen 11130101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5437 -33 50 no odor I no sheen 02/26102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5101 3014 no odor I no sheen 05/16/02 1000 10 110 22 130 270 <0 50 <0 50 25 56 <150 <5 0 066 <0 50 5099 2242 -2857 no odor 1 no sheen 09/12/02 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5891 3649 no odor I no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5756 3514 no odor 1 no sheen 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5444 3202 no odor I no sheen 06102/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 092 <0 50 53 53 31 11 no odor I no sheen 09/18/03 670 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5981 37 39 no odor 1 no sheen 11/24/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5862 3620 no odor 1 no sheen 02123/04 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 1 1 <0 5o 5528 -3286 no odor I no sheen 06107/04 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5539 3297 no odor I no sheen 09107/04 ns as ns ns ns ns ns ns ns ns ns ns ns ns 6106 -3864 insufficient water i 414gmr04 AS Page 10 of 13 HORIZON BNViROPI1dEPTA1.INC Project Na 1419 47