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ER . GROUNDWATER AORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE D1PE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ugll.) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments AS 2 10=100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 4152 2076 2076 screened 12/21100 18000 120 1200 530 2800 <50 na na na na na na na na 45 98 2522 slight odor 1 no sheen interval 03/27/01 11000 91 820 230 1800 <20 na na na no na na na na 4651 2575 slight odor 1 no sheen 123 128 06/26101 12000 80 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2849 slight odor 1 no sheen 09/05101 7400 75 31 140 1100 <20 na na na na 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 na 5415 3339 odorino sheen 02127/02 3200 46 9 B 28 260 <10 na na na na na na na na 5083 3007 odorino sheen 05116102 3500 40 10 74 410 <2 0 <2 0 <2 0 <2 0 <20 <200 180 <2 0 -20 51 10 2232 28 7B odor/no sheen 09/13/02 3400 120 110 89 480 <10 na na na na na na na na 5937 3705 odor!no sheen 12/04/02 1400 40 12 11 110 <50 na na na na na na na na 5839 3607 no odor/no sheen 02!17/03 420 16 49 28 43 <0 50 na na na na na na na na 5408 3176 no odor 1 no sheen 06)03103 450 27 1 2 32 go <0 50 4 50 <0 50 <0 50 <5 0 <50 58 <0 50 <0 50 5396 3164 no odor 1 no sheen 09/18/03 3800 16 094 12 66 <50 na na na na na na na na 6031 3799 no odor 1 no sheen 11/24/03 ns ns n$ ns ns ns ns ns ns ns ns ns ns ns 5880 3648 not sampled 02/23/04 2200 76 1 7 72 74 <0 50 <0 50 <0 50 <0 50 <5 0 <50 77 <0 50 <0 50 5523 3291 odor 1 no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5578 3346 not sampled 09/07/04 1200 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 6236 4004 no odor/no sheen 12/10/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5978 3746 not sampled AS 3 10/20/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 40 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 2547 screened 12/21/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 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 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 09/05101 too <0 50 4050 <0 50 18 <5 0 na na na na na na na na 5411 3351 odor/no sheen 11/30/01 74 13 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5393 3333 odorfio sheen 02/27/02 73 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5067 3007 no odor 1 no sheen 05116/02 <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 1 no sheen 09113/02 75 <0 50 1 1 4 50 4 50 <5 0 na na na na na na na na 5886 3672 odor/no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na 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 06/02/03 <50 <0 50 <0 50 4 50 <0 50 <0 50 <0 50 <0 50 4 50 <5 0 <50 84 13 <0 50 5422 3208 no odor 1 no sheen 09/18/03 45000 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 6000 3786 no odor I no sheen 11/24/03 ns ns ns ns ns AS ns ns ns ns ns ns ns ns 5864 3650 not sampled 02/23/04 860 <0 50 094 <0 50 059 072 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 5504 3290 odor/no sheen 06/07/04 ns AS ns ns ns ns ns ns ns n$ ns ns ns ns 5554 3340 not sampled 09/07/04 5200 69 36 66 370 <0 50 na na na na na na na na 6208 3994 no odor/no sheen 12!10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5958 3744 not sampled Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater nm=not measured MTBE=methyl tert butyl ether DCA=Dichloraethane TOC=top of casing na=not analyzed DIPE=dttsopropyl ether EDB-dibromoethane <-less than indicated reporling limit ns=not sampled ETBE=ethyl tart butyl ether pg/L= micrograms per liter=parts per billion(ppb) TAME=tart amyl methyl ether 419gmr64 As Prgeallo 141947 Page 13 of 13 HORIZON ENVIRONMENTAL INC