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TO , 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 (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (ug/L) (ugll-) (uglL) (uglL) (ug/L) (ug1L) (uglL) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-2 03/31/98 94 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4826 2135 -2691 screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4267 21 32 interval 09/08/98 98 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 24 <50 <50 na na 4731 2596 no odor 1 no sheen 65 -85 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2059 wellhead survey 12!30198 84 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4555 -2496 no odor 1 no sheen 03126/99 78 <0 50 <0 50 <0 50 <2 0 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 41 25 2066 no odor 1 no sheen 06/02/99 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 97 <50 <5 0 160 <0 50 4075 2016 no odor 1 no sheen 08131/99 79 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 74 <50 <5 0 65 <0 50 4572 2513 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 15 <0 50 <0 50 <0 50 <50 <50 <5 0 42 <0 50 4720 2661 02121/00 <50 <0 50 <0 50 <0 50 <0 50 1 <0 50 <0 50 <0 50 <50 <50 <50 30 <0 50 4552 2493 no odor 1 no sheen 05/18100 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 4076 -2017 no odor 1 no sheen 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4913 2854 no odor!no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4735 2676 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 14 na na na na na na na na 4631 2572 no odor!no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 25 <0 50 <0 50 <0 50 <50 <50 <5 0 60 <0 50 4902 2843 no odor I no sheen 09/05/01 230 <0 50 053 <0 50 <0 50 <5 0 na na na na na na na na 5425 3366 no odor I no sheen 11130/01 64 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5396 3337 no odor 1 no sheen 02127/02 110 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5065 3006 no odor I no sheen 05116/02 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 110 <0 50 5091 2214 2877 no odor I no sheen 09/12/02 160 14 083 <0 50 <0 50 <5 0 na na na na na na na na 5913 -3699 no odor I no sheen 12/04/02 79 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5713 -3499 no odor I no sheen 02117/03 100 <0 50 <0 50 <0 50 <0 50 <0 5o na na na na na na na na 5401 31 87 no odor 1 no sheen 06103/03 100 <0 50 <0 50 <0 50 <0 50 17 <0 50 <0 50 <0 50 <5 0 <50 <50 75 <0 50 5372 3158 no odor/no sheen 09118!03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5843 3629 not sampled 9qm 03 Al. Page 2 or 13 HORIZON ENVIRONMENTAL INC