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E 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 DIPS ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date jug/L) (ug1L) (ugIL) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (uglL) (feet) (teet sea level) (feet sea level) Comments AS 2 10!20100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <50 <50 610 11 63 4152 2076 2076 screened 12121/00 1 BDDD 120 1200 530 2800 <50 no no na na na na na no 4598 2522 slight odor I no sheen interval 0327101 11000 91 820 230 1800 <20 na na na na na na na na 4651 2575 slight odor/no sheen 123 128 05126101 12000 80 68 220 2000 <25 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2849 slight odor f no sheen 09105/01 7400 75 31 140 1100 <20 na na no no na na na no 5329 3253 slight odor/no sheen 1150101 6600 70 15 110 740 <25 no no na no no na na na 5415 3339 ododno sheen 02127102 3200 46 98 28 280 <10 no no na no na no na na 5083 -3007 odor/no sheen 05116/02 3500 40 10 74 410 <20 <2 0 <2 0 <2 0 <20 c200 180 <20 <20 51 10 2232 28 78 ododno sheen 0911=2 3400 120 110 89 480 <10 no no na na na na na na 5937 3705 ododno sheen 12104102 1400 40 12 11 110 <5 0 no na na na na na na na 5839 3607 no odor 1no sheen 02117103 420 16 49 28 43 <0 50 na na na na no no na na 5408 3176 no odor I no sheen 06103/03 450 27 12 32 90 <0 50 <0 50 <0 50 <0 50 <5 0 450 58 <0 50 <0 50 5395 3164 no odor I no sheen 09118103 3800 16 094 12 66 <5 0 na na na na na na na na 6031 -3799 no odor 1 no sheen AS-3 1020100 <50 <0 50 <0 50 <0 50 <D 5D <0 50 <0 50 <0 50 <0 50 <50 <50 81 ODD <0 50 <0 50 4607 2060 2547 screened 12121100 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na no no no no no 4805 2745 no odor I no sheen interval 0327M1 <50 23 58 <0 50 <o 50 <50 no na no na na no no no 4682 2622 no odor f no sheen BO-85 0626161 <50 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 690 89 to 50 4896 2836 no odor I no sheen 09105101 too <0 50 <0 50 <0 50 18 <60 no na na na na no na na 5411 3351 adodno sheen 11130101 74 13 <0 50 <0 50 <0 50 <5G no no na na na na no na 5393 -3333 ododno sheen 02/27102 73 <0 50 <0 50 <0 50 <0 50 <50 no na na na na na no no 5067 3007 no odor 1 no sheen 05116102 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 47 94 <0 50 5097 2214 2883 no odor I no sheen 09/13102 75 <0 50 11 <o 50 <0 5o <50 na na no na no no no na 5886 3672 odor I no sheen 12104102 <50 <0 50 <0 50 <0 50 <0 50 <50 na na no na no no no as 5234 3020 no odor I no sheen 02117173 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 2857 no access 06102143 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <o 50 <0 50 <50 <50 84 13 <0 50 5422 -32 D8 no odor I no sheen 09/18/03 45000 <0 5D <0 50 <0 50 <0 50 -50 na no no no no no no na 6000 3786 no odor I no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=lert-butanol GW=groundwater nm=not measured MTBE=methyl tart butyl ether DCA=Dichloroethane TOC=tap of casing na=not analyzed DIPE=dnsopropyl ether EDB=drbromoelhane <=less than indicated reporting limit ns=not sampled ETBE=ethyl tart butyl ether pglL= m=aograms per liter=parts per billion(ppb) TAME=tart-amyl-methyl ether f Pnoted No 11:1945 Page 8 of 8 HORIZON ENVIRONMENTAL INC optl 4