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TOE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 ` 2350 Waterloo Road, Stockton, California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date I (ug1L) (ug/L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments A5 1 02/21/00 80000 7600 16000 1600 9100 34 <2 0 <20 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen screened 05/18100 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 41 09 nm no odorino sheen interval 09126100 54000 2600 5300 590 3200 <5 0 na na na na na na na na 4913 nm slight odor!no sheen 64 69 12121100 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odor/no sheen 03127/01 140000 16000 34000 3300 18000 <500 na na na na na na na na 4665 nm odorino sheen 06/26/01 140000 14000 34000 3700 18000 <1 0 <1 0 <1 0 <1 0 <10 <100 <100 83 140 4979 nm odor/no sheen 09/05/01 210000 17000 39000 4600 25000 <500 na na na na na na na na 5441 nm odor/no sheen 11/30/01 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odorino sheen 02/27/02 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5096 nm slight odor/no sheen 05/16/02 120000 11000 23000 2200 11000 <100 <100 <100 <100 <1000 <10000 <1000 <100 <100 51 11 2242 2869 slight odorino sheen 09/13/02 160000 12000 44000 5100 22000 <200 na na na na na na na na 5928 3686 odor!no sheen A5 2 10/20/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 So <5 0 <50 610 1 1 63 4152 2076 2076 screened 12/21/00 18000 120 1200 530 2800 <50 na na na na na na na na 4598 2522 slight odor!no sheen interval 03/27/01 11000 91 820 230 1800 <20 na na na na na na na na 4651 2575 slight odor 1 no sheen 123'-128' 06126101 12000 60 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2849 slight odor 1 no sheen 09105/01 7400 75 31 140 1100 <20 na na na na na na na na 5329 3253 slight odor 1 no sheen 11/30/01 6600 70 15 110 740 <25 na na na na na na na na 5415 3339 odor/no sheen 02/27/02 3200 46 98 28 280 <10 na na na na na na na na 5083 3007 odorino sheen 05/16/02 3500 40 10 74 410 <2 0 <2 0 <2 0 <2 0 420 <200 180 <2 0 <2 0 51 10 2232 2870 odorino sheen 09/13/02 3400 120 110 89 480 <10 na na na na na na na na 5937 3705 odor I no sheen A53 10/20100 <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 12/21100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na ria na na na na na 4805 2745 no odor!no sheen interval 03/27101 <50 23 56 <0 50 <0 50 <5 0 na na na na na na na na 4682 2622 no odor 1 no sheen 80'-85' 06/26/01 <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 09/05/01 100 <0 50 <0 50 <0 50 18 <5 0 na na na na na na na na 5411 3351 odorino sheen 11/30/01 74 13 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5393 3333 odorino sheen 02/27/02 73 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5067 -3007 no odor!no sheen 05/16102 <50 <0 50 1 8 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 47 94 <0 50 5097 2214 -2883 no odor I no sheen 09/13/02 75 <0 50 1 1 <0 50 <0 50 <5 0 na na na na na na na na 5886 -3672 odor 1 no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=ter, butanol GW=groundwater nm=not measured MTBE=methyl-tert-butyl ether EDC=ethylene dichloride TOC=top of casing na=not analyzed DIPE=dusopropyl ether EDB=ethylene dibromlde <=less than indicated reporting limit ns=not sampled ETBE=ethyl-lert butyl ether pg1L= micrograms per liter=parts per billion(ppb) TAME=tert amyl-methyl ether 419gmrV2;ds Prored No 1419 45 Page 7 of 7 HORIZON ENVIRONMENTAL INC