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ti� 1 • � f 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 Dale (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (ug/L) (ug1L) (uglL) (uglL) (ug1L) (ug/L) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW 2 03131198 94 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4826 2135 -2691 screened 06110/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4267 -2132 interval 09/08/98 98 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 24 <50 <5 0 na na 4731 -2596 no odor 1 no sheen 65'-85' 11/12198 ns ns ns ns ns ns 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 1 n0 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 4125 2066 no odor 1 no sheen 06/02199 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 97 <50 <50 160 <0 50 4075 -2016 no odor 1 no sheen 08/31/99 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 <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 <50 <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 50 <5 0 <50 <5 0 na na 4076 -2017 no odor!no sheen 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4913 -2854 no odor/no sheen 12120/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4735 -2676 no odor!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 <5 0 <50 <5 0 60 <0 50 4902 -2843 no odor!no sheen 09/05/01 230 <0 50 053 <0 50 <0 50 <50 na na na na na na na na 5425 3366 no odor!no sheen 11130/01 64 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5396 3337 no odor!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!no sheen 05/16/02 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 110 <0 50 5091 2214 2877 no odor!no sheen 09/12/02 160 14 063 <0 50 <0 50 <5 0 na na na na na na na na 5913 3699 no odor 1 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 1 no sheen 02/17/03 100 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5401 3187 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 31 58 no odor/no sheen 09/18/03 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 02/23/04 <50 24 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 38 <0 50 5487 -3273 no odor 1 no sheen 419gmrG4 AS Project No 1419 47 Page 2 of 13 HORIZON ENVIRONMENTAL INC