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Tel GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton, California ethyl- Depth to TOC GW Well TPHbenzene toluene benzene xylenes MTBE RIPE ETRE TANTE TBA methanol ethanol EDC EDS GW- Elevation Elevation Number Date 1(ugli.] (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (u IL) (u L) (feet) (feet sea level) (feet sea level) Comments n=e 02121/00 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen 05118!00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1DD0 <100 na na 4109 nm no odorino sheen 09!26100 54000 2600 5300 590 3200 <50 na na na no na na na na 4913 nm slight odor 1 no sheen 12/21/00 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odarino sheen 03127!01 140000 16000 34000 3300 18000 <500 no na no na na na no na 4665 nm odorino sheen 06/26/01 140000 14000 34000 3700 18000 <10 <1 0 <1 0 <1 0 <10 <100 <100 83 140 4979 nm odorino sheen 09/05101 210000 17000 39000 4600 25000 <500 na na no na na na na na 5441 nm odorino sheen 11/30101 150000 12000 32000 4000 19000 <2000 no na no no no na na no 5470 nm odor/no sheen 02127/02 200000 11000 38000 3600 19000 <2000 na na na na na no na na 5096 nm slight odarino sheen 05/18/02 120000 11000 23000 2200 11000 <100 <100 <100 <100 <1000 <10000 <1000 <100 <100 51 11 2242 2869 slight odorino sheen 09113/02 160000 12000 44000 5100 22000 <200 na na na na no na na na 5928 -3686 odor 1 no sheen 12!04102 110000 8300 25000 2200 120W <500 na na na no na na na na 5750 -3508 odor!no sheen 02/17103 170000 18000 33000 3100 15000 <200 na no no no na na na na 5497 -3255 odor Ino sheen AS 2 10/20/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 41 52 2076 -2076 screened 12/21/00 18000 120 1200 530 2800 <50 na na na na na no na no 4598 2522 slight odor 1 no sheen Interval 03127/01 11000 91 820 230 1800 <20 na no na na na na na na 4651 2575 slight odor 1 no sheen 123'128' 06!26!01 12000 80 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <25 50 4925 2849 slight odor!no sheen 09105101 7400 75 31 140 1100 <20 no na na no na na na na 5329 3253 slight odor 1 no sheen 11130101 6600 70 15 110 740 <25 na na na na na na na no 5415 3339 odor/no sheen 02127102 3200 46 98 28 280 <10 na na na na no na na na 5083 3007 odorino sheen 05116102 3500 40 10 74 410 <2 0 <2 0 <2 0 <2a <20 <200 180 <2 0 <2 0 51 t0 2232 2878 odorino sheen 09113102 3400 120 110 89 480 <10 na na na no na no na na 5937 3705 odor Ino sheen 12/04102 1400 40 12 11 110 450 no na no na na na na na 5839 3607 no odor!no sheen 02/17/03 420 16 4 9 2 8 43 <0 50 na no na na na na na na 1A 08 -3176 no odor I no sheen AS-3 10120/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 81000 <0 50 <0 50 4607 2060 -2547 screened 12121/00 <50 <0 50 <0 50 <0 50 <0 50 <50 no na na na na na na no 4805 -2745 no odor 1 no sheen interval 03127/01 <50 23 58 <0 50 <0 50 <5 0 na na na na no na na na 4682 -2622 no odor!no sheen 80'-85 06128/01 <50 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 690 89 <0 50 4896 -2836 no odor 1 no sheen 09105/011130 <0 50 <0 50 <0 50 1 8 <50 na na na na na na na na 5411 -3351 odor/no sheen 11/30/01 74 1 3 <0 50 <0 50 <0 50 <50 na na na na na na na na 5393 3333 odorhw sheen 02/27102 73 <0 50 <0 50 <0 50 <0 50 <5 0 no na no na na na na na 5067 -3007 no odor 1 no sheen 05/16/02 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 450 <50 47 94 <0 50 5097 2214 2683 no odor 1 no sheen 09!13102 75 <050 1 1 <0 50 <0 50 <50 no na na na na na na na 5886 -3672 odor 1 no sheen 12104/02 <50 <0 50 <0 50 <0 50 <0 50 <50 no no na na na na na na 5234 -3020 no odor 1 no sheen 02/17/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 -2857 no access Notes TPHg a total petroleum hydrocarbons as gasoline TBA=tort butanol GW=groundwater nm not measured MTBE=methyl-tert-butyl ether EDC=ethylene dichlonde TOC=top of casing na a not analyzed DIPE=dusopropyl ether EDB=ethylene dibromide <=less than indicated reporbng Irmd ns=not sampled ETBE=ethyl tort butyl ether pg1L a micrograms per liter=parts per billion(ppb) TAME=tert amyl-methyl ether 419gmr02 As Page 7 of 7 HORIZON BNVMONbMIFTAL INC Ruled No 1419 45