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TABLE 1 GROUNDWATER MONITORING DATA I 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 Dateu L) (ug/LL (ug1L) (uglL) (u 1L) (ug/L) ug1L) (Iug/L) (ug/L) (ug1L) (ug1L) (ug]L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-8 11112/98 ns ns ns ns Its ns nsns ns ns ns ns ns ns ZO 38 wellhead survey screened 12/30198d 12 076 <0 50 081 <5 0 na na no na na no na na 4536 2498 no odor Ino sheen interval 03/26199 58 <0 50 <0 50 <0 50 <0 50 5i <0150 <0'50 <0 50 <50 <50 <10 na na 41 08 2070 no odor 1 no sheen 41 -66 06!02199 <50 <0 50 <0 50 <0 50 <0 50 29 <0"50 <0 X50 <0 50 <50 <50 <5 0 86 <0 50 4052 2014 no odor 1 no sheen 08!31199 <50 <0 50 <0 50 <0 50 <0 50 16 <01'50 <0'5o <0 50 <5 0 <50 <5 0 54 <0 50 4544 2506 no comment 12!09199 <50 <0 50 <0 50 <0 50 <0 50 14 45o <0 50 <0 50 <5 0 <50 <5 0 60 <0 50 4701 2663 02121/00 210 <0 50 <0 50 <0 50 <0 50 20 10"50 <A0 -050 <50 <50 <5 0 69 <0 50 4638 2500 no odor 1 no sheen 05/18100 53 <0 50 <0 50 <0 50 <0 50 18 <01510 -:A0 <0 50 <5 0 e50 <50 na na 4054 -2016 no odor 1 no sheen 11 09/26/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4913 2875 no odor I no sheen 12/20/00 <50 <0 50 051 <0 50 <0 50 <5 0 nIa na na na na na ria na 4752 -2714 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na ne na na na 4613 2575 no odor 1 no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 16 <010 <0 X50 <0 50 <5 0 <50 <5 0 57 <0 50 4876 2838 no odor 1 no sheen I IF 09105/01 1800 200 25 65 250 <50 na na na na ria na na na 5384 3346 no odor 1 no sheen it 11130101 370 65 <0 50 60 083 10 na na na na na na na ria 5386 3348 no odor 1 no sheen It 02127/02 90 <0 50 <0 50 <0 50 <0 50 66 na na na na na na na na 5049 3011 no odor 1 no sheen 05/16102 76 <0 50 13 <0 50 1050 4 6 <0'50 <0'5'0 <050 <5 0 <50 <5 0 58 <0 50 5061 2194 2867 no odor I no sheen 09113102 ns ns ns Its ns ns' ns na ns ns ns ns ns ns 5854 3660 dry 12/04102 360 12 1 3 26 <0 50 7 7 ns ns ns Its ns ns ns ns 5709 3515 no odor 1 no sheen 02!17103 120 <0 50 3 1 <0 50 <0 50 61" na na na na na na na na 5389 3195 no odor 1 no sheen 1.06103103 100 <0 50 <0 50 <0 50 <0 50 57, <0 i50 <0 X50< 0 50 <5 0 <50 <50 73 <0 50 5322 31 28 no odor 1 no sheen 09118!03 ns Its ns ns ns ns'11 ns ns ns its ns ns ns ns dry nm dry 11/24103 ns ns ns ns ns ns ns r1s ns ns ns ns ns ns 58 35 1 -3641 not sampled 02123104 100 <0 50 <0 50 <0 50 <0 50 40 <0 50 <0 50 <0 50 5 1 <50 <5 0 54 <0 50 54 81 3287 no odor 1 no sheen 08!07104 70 <0 50 058 <0 50 <0 50 <50 na na na na na na na na 5502 3308 no odor 1 no sheen IF n 09107104 ns ns ns ns ns ns ns its ns ns ns ns ns ns dry nm dry 11 12/10104 ns ns ns Its ns ns' ns ns ns ns ns ns ns ns 5926 3732 considered dry 03/09/05 67 <0 50 34 <0 50 <0 50 17 <01j0 <0'5G <050 <5 0 <50 <5 0 37 <0 50 5572 3378 odor 1 no sheen t I , 3 I jI I 1 1 419gmrO5 Project No� E Pa•13 HORIZOIJ ENVIRONOAL IHC f � �I