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I i OLE1 . r 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 (ug/L u !L) (ug1L) (u 1L (u 1L) (uglt) uglL u 1L) (u !L) (u IL) (ug1L) (ug/ (uglL) u 1L) (feet)___(feet sea level) (feet sea level) Comments MW-2 03131/98 94 <0 50 <0 50 <0 50 <0 50 <50 no na no no no no na no 4826 2135 2691 screened 06110/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no na no 4267 -2132 interval 09108!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 I no sheen 65 -85 11112198 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 no no no na no no na na 45 5� -2496 no odor 1 no sheen 03/26/99 1 78 <0 50 <0 50 <0 50 <2 0 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na no 4125 -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 08/31/99 79 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 74 <50 <50 65 <0 50 4572 -2513 no comment 12109!99 <50 <0 50 <0 50 <0 50 <0 50 15 <0 50 <0 50 <0 50 <5 0 <50 <50 42 <0 50 4720 -2661 02!21100 <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 1 no sheen 05118/00 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no na 4076 -2017 no odor 1 no sheen 09!26100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4913 -2854 no odor!no sheen 12!20!00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4735 -2676 no odor/no sheen 03!27101 <50 <0 50 <0 50 <0 50 <0 50 14 na no no no no no no no 4631 2572 no odor/no sheen 06/26101 <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 09/05101 230 <0 50 053 <0 50 <0 50 <50 no no no no na na no no 5425 -3366 no odor!no sheen 11/30101 64 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5396 -3337 no odor!no sheen 02/27102 110 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no no no 5065 -3006 no odor I 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 1 no sheen 09112/02 160 14 063 <0 50 <0 50 <5 0 no no no no no no no no 5913 -3699 no odor 1 no sheen 12104/02 79 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5713 -3499 no odor I no sheen 02117/03 100 <0 50 <0 50 <0 50 <0 50 <0 50 no na no no no no no no "401 -3187 no odor I no sheen 06103103 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 1 no sheen 09118/03 ns n$ ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5843 -3629 not sampled 02/23104 <50 24 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 38 <0 50 5487 3273 no odor I no sheen 06!07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5535 -3321 not sampled 09107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 91 -3977 not sampled 12/10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5948 -3734 not sampled 03/08105 <50 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 39 <5 0 5580 -3366 odor 1 no sheen 05124!05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5091 -2877 not sampled 08/31105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5625 -3411 not sampled 12/12/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5320 -31 06 not sampled 1 419gmr45 ProrW No 1419 48 Page 2 of 16 HORIZON ENVIRONMENTAL INC