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TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton, California ethyl Depth to TOC GW Well TPHg lbenzene toluene benzene xylenes MTBE DIPiE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u IL) (ugIL) (ug/L) (u IL} (ug/L) ug/L) (u911L) (ug/L) ug/L) (ug1L) (ug/L feet ) (ug (ug1L} {ug1L) (feet) (feet sea level) (feet sea level) Comments MW-2 03/31198 94 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no na no no 4826 2135 2691 screened 06!10198 <50 <0 50 <0 50 <0 50 <0 50 <50 na no no no no no na no 4267 21 32 I interval 09108198 98 <0 50 <0 50 <0 50 .050 <0 50 <0 50 <0 50 <0 50 24 <50 <50 no no 4731 2590 no odor 1 no sheen 65 85 11112!98 ns ns ns ns ns ns{; ns ns ns ns ns ns ns ns 2059 wellhead survey 1 it 12/30/98 84 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no no 4555 2496 no odor 1 no sheen 03126!99 78 <0 50 <0 50 <0 50 <2 0 <0 5D <0 51.0 <0 50 <0 54 <5 0 <50 <20 no no 41 25 2066 no odor!no sheen 06102/99 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <050 <0 50 97 <50 <5 0 160 <0 50 4075 2016 no odor 1 no sheen 08/31199 19 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 74 <50 <5 0 65 <0 50 4572 25 13 no comment 12109199 <50 <0 50 <0 50 <0 50 <0 50 151, <0 50 <0 50 <0 50 <5 0 <50 <50 42 <0 50 4720 -2661 02/21/00 <50 <0 50 <0 50 <0 50 <0 50 1 ' <0 50 <Q 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 <5 0 no na 4076 2017 no odor 1 no sheen 09/26100 <50 <0 50 <0 50 <0 50 <0 50 <50 no nal no no no no no na 4913 2854 no odor 1 no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <50 no nal no no no no na no 4735 2676 no odor 1 no sheen 03127104 <SQ <0 50 <Q 50 <0$0 <0 50 14 li na nal no no na no no na 4631 2572 no odor 1 no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 251, <0 50 <0 50 <0 50 <50 <50 <5 0 60 <0 50 4902 2843 no odor 1 no sheen 09/05/01 230 <0 50 053 <0 50 <0 50 <50 no na na na no na no na 5425 3366 no odor 1 no sheen 11!30101 64 <0 50 <0 50 <0 50 <0 50 <5 0 na" no no no na no no no 5396 -33 37 no odor!no sheen 02127102 110 <0 50 <0 50 <0 50 <0 50 <50 na na na no na no na no 50 65 3006 no odor!no sheen 05!16102 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 54 <0 50 <0 50 <5 0 < < , �� 50 5 0 110 <0 50 5091 22 14 2877 no odor!no sheen 09!12102 160 14 063 <0 50 <0 50 <5 0 na nal no no no na no no 59 13 -3699 no odor!no sheen 12104/02 79 <0 50 <Q 54 <D 50 <0 50 <5 0i nal na, no no no na no no 57 13 -3499 no odor 1 no sheen 02!17103 100 <0 50 <0 50 <0 50 <0 50 <0 50 nal no, na na no na no na 54 01 -3187 no odor!no sheen 06/03/03 100 <0 50 <0 50 <0 50 <0 50 1 7„ <0 50 <0 W <0 50 <5 0 <50 <50 75 <0 50 5372 31 58 no odor I no screen 09118/03 ns ns ns ns ns ns{ ns ns ns ns ns ns AS ns nm nm not sampled 11124103 ns ns ns ns ns ns 1, nsl nsl ns ns ns ns ns ns 5843 3629 not sampled 02123104 <50 24 <0 50 <0 50 <0 50 <0 50 <0 80 <0 50 <0 50 <5 0 <50 <5 0 38 <0 50 5487 3273 no odor 1 no sheen 06107!04 ns ns ns ns ns ns ns� ns ns ns ns ns ns ns 55 35 33 21 not sampled i 09107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6191 3977 not sampled 12110104 ns ns ns ns ns ns nsF ns ns ns ns ns ns ns 59 48 37 34 not Sampled 03!08105 <50 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 39 <50 5580 3366 odor 1 no sheen i I� it I I i I I , 419gmN5 x ( F PlulecS No I Page3 HORIZON FNVIRONBW INC i