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II{ I 1 TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 350 Waterloo Road,Stockton,California ethyl- Depth to roc GW I Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u fLu !L (ug/L (ug/L !L u A- u A ue/. u 1i u 1L u A- u u !L u 1L feet feet sea level feet sea levetComments MW-5 03/31198 75 <0 50 -050 <0 50 <0 50 <5 0 na na no no no no no no 4846 2043 2803 screened 06110M <50 <0 50 <0 5D <0 50 <0 50 <50 f no no no no no no no no 4272 2229 Interval 09/08198 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 no no 4692 2649 no odor I no sheen 48 71 11/12/98 ns ns ns n$ ns ns ns Ins as ns ns ns ns ns 2043 wellhead survey I213DI98 110 067 <0 50 <0 50 <0 50 <5 0 I no no no no no no no no 4545 2502 no odor 1 no sheen 03J26199 67 -050 <0 50 <0 50 <0 50 c0 50 <0 50 <0 50 <0 50 <50 <50 <20 no no 4126 20 83 no odor 1 no sheen 06102199 c50 <0 50 <0 50 <0 50 <0 50 <0 50 c4 50 <0 50 <0 50 <50 <50 <5 0 71 c0 50 4061 2018 no odor!no sheen I 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <D 50 <0 50 <5 0 <50 <5 0 16 <0 50 4549 2506 no comment 12!09199 140 <0 50 <0 50 <0 50 <0 50 <0 50 050 <0 50 <0 50 <5 0 <50 <5 0 200 <0 50 4704 2661 02121100 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 19D <0 50 4547 2504 no odor 1 no sheen 05!18100 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 no no 4071 2028 no odor!no sheen 09126!00 64 <0 50 <0 50 <0 50 <0 50 <5 0 Ina no no no no no no no 4882 28 39 no odor!no sheen 12120!00 <50 <0 50 <0 50 <0 50 <0 50 �5 0 Ina Ina no no no no na no 4741 2698 no odor I no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na no no no no no no no 4619 2576 no odor 1 no sheen 06126101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 t6 <0 50 4876 2833 no odor!no sheen 09/05/05 <50 <0 50 <0 50 <0 50 ,050 <5 0 Ina Ina no no no no as no 5379 3336 no odor 1 no sheen 11130101 <50 <0 50 -050 <0 50 <O 50 50 Ina Ina na no na na na no 5388 3345 no odor I no sheen 02127/02 <50 <0 50 062 <6 50 <0 50 <5 0 I!no Ina no no no no no na 5052 3009 no odor!no sheen 11 05116/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <60 <5 0 14 <0 50 5062 21 99 2863 no odor 1 no sheen 09/12102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 �no no no no no no no no 5857 3658 no odor!no sheen 12/04102 <50 <0 50 <0 50 <0 50 <0 50 �5 0 no no no no no no no no 5711 3512 no odor 1 no sheen 02!17103 57 <0 50 <0 50 <0 50 <0 50 <0 50 JEna 'na no no no no no no 5403 3204 no odor f no sheen 06102!03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 I 09!18/03 ns ns ns ns ns ns ��ns Ins ns ns ns ns ns ns nm nm not sampled 11/24103 ns ns ns ns ns Ins ns Ins ITS ns ns ns as ns 5833 W 34 not sampled 02/23104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <050 <0 50 10 50 1.50 <50 <5 0 22 <0 50 5484 3285 no odor!no sheen 06/07/04 ns ns ns ns Its Ins l'ns ins ns ns ns ns ns ns 5504 3305 not sampled 09107164 ns ns ns ns as Ins ns ns ns ns ns ns ns ns 6153 3954 not sampled 12/10104 as ns ns ns ns as ns It ns ns ns ns ns ns 5930 3731 not sampled 03108105 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 450 <5 0 <0 50 <0 50 5574 3375 no odor 1 no sheen 05124!05 ns ns ns ns ns ns Ins ns ns ns as ns ns ns 5085 2886 not sampled 08!31105 ns ns ns ns ns ns Ins Ins ns ns ns ns ns ns 5583 3384 not sampled I �F I I I I I I i I I �a I I I tt mR5 P te# It P i3 HORIZON ZIMRO AL INC