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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 TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDS GW ElevationElevation Number Date (ug1L) (ug1L) (ug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (ug/L) (ug/L) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW 2 03/31198 94 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4826 21 35 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 1 -21 32 interval 09/08198 98 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 24 <50 <5 0 na na 47 31 -2596 no odor 1 no sheen 65 -85 11/12198 ns ns ns ns ns as ns ns ns ns ns ns ns ns 2059 wellhead survey 12/30/98 84 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4555 2496 no odor!no sheen 03/26/99 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 20 16 no odor 1 no sheen 08/31/99 79 <0 50 <0 5D <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 74 <50 <5 0 65 <0 50 4572 25 13 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 15 <0 50 <0 50 <0 50 <5 0 <50 <5 0 42 <0 50 4720 -2661 02/21/00 <50 <0 50 <0 50 <0 50 <0 50 1 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 4552 -2493 no odor!no sheen 05/18/00 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0$0 <5 0 <50 <5 0 na na 4076 -2017 no odor!no sheen 09/26/00 <50 <0 50 <0 50 1050 <0 50 <5 0 na na na na na na na na 4913 2854 no odor 1 no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4735 2676 no odor 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 14 na na na na na na na na 4631 2572 no odor 1 no sheen 06126/01 <50 <0 50 <0 50 <0 50 <0 50 25 <0 50 <0 50 <0 50 <5 0 <50 <5 0 60 <0 50 4902 2843 no odor 1 no sheen 09105/01 230 <0 50 053 <0 50 <0 50 <5 0 na na na na na na na na 5425 3366 no odor I no sheen 11/30/01 64 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5396 33 37 no odor 1 no sheen 02/27/02 110 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5065 3006 no odor 1 no sheen 05/16/02 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 110 <0 50 5091 2214 -2877 no odor!no sheen 09/12102 160 14 063 <0 50 <0 50 <5 0 na na na na na na na na 5913 -3699 no odor!no sheen 12104/02 79 <0 50 <11 50 <0 50 1050 <5 0 na na na na na na na na 5713 -3499 no odor!no sheen 02/17/03 10o <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 54 01 -31 87 no odor!no sheen 06103/03 100 <0 50 <0 50 <0 50 <0 50 17 <0 50 <0 50 <0 50 <5 0 <50 <5 0 75 <0 50 5372 -31 58 no odor 1 no sheen 09/18103 ns as ns ns ns ns as ns ns ns ns ns ns n$ nm nm not sampled 11124103 ns ns ns ns ns ns ns ns ns ns ns ns ns as 5843 -3629 not sampled 02123104 <50 24 <0 50 <0 50 <0 50 <9 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 38 <0 50 5487 3273 no odor 1 no sheen 06/07/04 ns as ns ns ns as ns ns ns ns ns ns ns ns 5535 3321 not sampled 09/07/04 ns as ns ns ns ns ns ns ns ns as ns ns ns 61 91 3977 not sampled 419q"04 xis Project No 1419 47 Page 2 of 13 HORIZON ENVIRONMENTAL INC