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TAIR1 r 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 ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (u 1L) (ug1L) (u 1L) (uglL} (u 1L) (uglL) (ug1L) {uglL) {ug1L) (u !L} (uglL) (u IL) 1(ugll-) (u 1L) (feet) (feet sea level) (feet sea level) Comments AS 1 02!21100 80000 7600 16000 1600 9100 34 <2 0 <2 0 <20 <20 380 12000 180 250 4589 nm nm slight odorino sheen screened 05118!00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odor/no sheen interval 09126!00 54000 2600 5300 590 3200 <50 na na na na na na na na 4913 nm slight odor 1 no sheen 64-69 12!21100 52000 5090 10000 1200 6000 <500 na na na na na na na na 4779 nm odorino sheen 03!27101 140000 16000 34000 3300 18000 <500 na na na na na na na na 4665 nm odor/no 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 54 41 nm odorino sheen 11!30101 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odor/no sheen 02/27/02 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5096 nm slight ododno sheen 05116102 120000 11000 23000 2200 11000 000 <100 <100 <100 <1000 <10000 <1000 <100 <100 51 11 2242 -2869 slight odor/no sheen 09!13)02 160000 12000 44000 5100 22000 <200 na na na na na na na na 5928 -3686 odor lno sheen 12/04102 110000 8300 25000 2200 12000 <500 na na na na na na na na 5750 -3508 odor 1 no sheen AS-2 10/20/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <50 <50 610 11 63 41 52 2076 2075 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 03/27101 11000 91 820 230 1800 <20 na na na na na na na na 4651 2575 slight odor)no sheen 123-128 06/26/01 12000 80 68 220 2000 <2 5 <2 5 <2 5 <25 <25 <250 <50 <2 5 50 4925 2849 slight odor!no sheen 09/05/01 7400 75 31 140 1100 <20 na na na na na na na na 5329 3253 slight odor!no sheen 11130!01 6600 70 15 110 740 <25 na na na na na na na na 5415 -3339 odor/no sheen 02!27102 3200 46 98 28 280 <10 na na na na na na na na 5083 3007 odor/no sheen 05/16/02 3500 40 10 74 410 <2 0 <20 <20 <2 0 <20 <200 180 <2 0 <2 0 5110 2232 2878 odor/no sheen 09!13102 3400 120 110 89 480 <10 na na na na na na na na 5937 3705 odor!no sheen 12!04102 1400 40 12 11 110 <50 na na na na na na na na 5839 3607 no odor!no sheen A5 3 10120!00 <50 <0 50 <0 50 <0 50 <050 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 -2547 screened 12/21/00 <50 <050 <0 50 <050 <0 50 <50 na na na na na na na na 4805 -2745 no odor 1 no sheen interval 03/27/01 <50 23 58 <0 50 <0 50 <5 0 na na na na na na na na 4682 2622 no odor/no sheen 80-85 06126101 <50 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 690 89 <050 4896 -2836 no odor 1 no sheen 09/05101 100 <0 50 <0 50 <050 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 C50 na na na na na na na na 5393 -3333 odor/no sheen 02127102 73 <0 50 <0 50 <050 <0 50 <5 0 na na na na na na na na 5067 -3007 no odor!no sheen 05116!02 <50 <0 50 18 <050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 47 94 <050 5097 2214 -2883 no odor l no sheen 09113!02 75 <0 50 11 <0 50 <050 <50 na na na na na na na na 5886 3672 odor l no sheen 12104!02 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5234 3020 no odor l no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater nm=not measured MTBE=methyl-tert butyl ether EDC=ethylene dichloride TOC=top of casing na=not analyzed DIPE=dasopropyl ether EDB=ethylene dibromide <=less than indicated reporting limit ns=not sampled ETBE=ethyl tert butyl ether pglL= micrograms per liter=parts per billion(ppb) TAME=tert-amyl methyl ether 419gmrp2 As Project No 1419 45 Page 7 of 7 HORIZON EHVIRONKENTAL INC