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TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road,Stockton, California <br /> ethyl Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (uglL) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments <br /> AS-1 02/21/00 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 1 BO 250 4589 nm nm slight odortno sheen <br /> screened 05/18/00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odor/no sheen <br /> interval 09/26100 54000 2600 5300 590 3200 <50 na na na na na na na na 4913 nm slight odor 1 no sheen <br /> i <br /> 64-69' 12121/00 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odor/no sheen <br /> 03127/01 140000 16000 34000 3300 18000 <500 na na ria na na na na na 4666 nm odortno sheen <br /> 06/26/01 140000 1400D 34000 3700 18000 <10 <1 0 <1 0 <1 0 <1D <100 <100 83 140 4979 nm odorino sheen <br /> 09105/01 210000 17000 39000 4609 25000 <500 na na na na na na na na 5441 nm odortno sheen <br /> AS-2 10120/00 29000 140 1600 650 3100 <D 50 <D 50 <0 50 <0 50 <50 <50 610 1 1 63 4152 2076 -2076 <br /> screened 12/21100 18000 120 1200 530 2800 <50 na na na na na na na na 4598 2522 slight odor 1 no sheen <br /> interval 03127101 11000 91 820 230 1800 <20 na na na na na na na na 4651 -2575 slight odor 1 no sheen <br /> 123'-128' 06/26/01 12000 80 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <25 so 4925 -2649 slight odor 1 no sheen <br /> 09/05/01 7400 75 31 140 1100 <20 na na na na na na na na 5329 -3253 slight odor 1 no sheen <br /> AS-3 10/20/00 <50 <0 50 <0 5D <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 e50 <50 81000 <0 50 <0 50 4607 2060 2547 <br /> screened 12121100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4805 -2745 no odor I no sheen <br /> interval 03127101 <50 23 58 <0 50 <0 50 <50 na na na na na na na na 4682 -2622 no odor 1 no sheen <br /> BO'-85' 06126101 <50 <0 5D 052 <0 50 <0 50 <0 5D <0 50 <0 50 <0 50 12 <50 690 89 <0 50 4896 -2836 no odor 1 no sheen <br /> 09105101 1 100 <0 50 <0 50 <0 50 is <5 0 na na na na na na na na 5411 3351 odorino sheen <br /> Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert-butanol GW=groundwater nm=not measured <br /> MTBE=methyl-tent-butyl ether EDC=ethylene dichloride TOC=top of casing na=not analyzed <br /> RIPE=dusopropyl ether EDB=ethylene dtbromtde <=less than indicated reporting limit ns=not sampled <br /> ETRE=ethyl-tent butyl ether pglL= micrograms per liter=parts per billion(ppb) <br /> TAME=tert-amyl-methyl ether <br /> I <br /> 419gmr01 ids Page 7 of 7 HORIZON EKV13RpNMENTAL]INC <br /> 1419 44 <br />