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- I To 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 RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ug1L) (ugll-) (uglL) (ug1L) (uglL) (uglL) (uglL) (ug1L) (uglL) (ug1L) (ug1L) (uglL) (feet) (feet sea level) (feet sea level) Comments AS 2 10120100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 4152 1 2076 -2076 screened 12/21/00 18000 120 1200 530 2800 <50 no no no no no no no no 4598 2522 slight odor 1 no sheen interval 03127/01 11000 91 820 230 1800 <20 na no no no no no no no 4651 2575 slight odor 1 no sheen 123-128 06126/01 12000 e0 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2849 slight odor)no sheen 09/05/01 7400 75 31 140 1100 <20 no no no no no no no no 5329 3253 slight odor 1 no sheen 11130/01 6600 70 15 110 740 <25 no no no no no no no no 54 15 33 39 odor/no sheen 02/27/02 3200 46 98 28 280 <10 no no no no no no no no 5083 -3007 odor/no sheen 05/16/02 3500 40 10 74 410 <20 <2 0 <2 0 <2 0 <20 <200 180 <2 0 <2 0 51 10 2232 -2878 odor/no sheen 09/13/02 3400 120 110 89 480 <10 no no no no na no no no 5937 3705 odor/no sheen 12!04102 1400 40 12 11 110 <5 0 no no no no no no no no 5839 3607 no odor lno sheen 02117103 420 16 49 2 B 43 <0 50 na no no no no no no no 54 OB 31 76 no odor 1 no sheen 06103103 450 27 12 32 90 <0 50 <0 50 <0 50 <0 50 <5 0 <50 58 <0 50 <0 50 5396 31 64 no odor 1 no sheen 09118/03 3800 16 094 1 2 66 <5 0 no no no na no no no no 6031 3799 no odor 1 no sheen 11/24103 ns ns ns 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!07104 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 no no no no no no no na 62 36 4004 no odor 1 no sheen AS 3 10/20/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 2547 screened 12/21100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4805 -2745 no odor!no sheen interval 03!27101 <50 2 3 58 <0 50 <0 50 <5 0 na no no no no no no no 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 100 <0 50 <0 50 <0 50 1 B <5 0 no no no no no na no no 54 11 -3351 odorino sheen 11/30101 74 13 <0 50 <0 50 <0 50 <5 0 na na no no no no no no 5393 3333 odorino sheen 02/27102 73 <0 50 <0 50 <0 50 <0 50 <5 0 na no na na no no no na 5067 3007 no odor 1 no sheen 05116102 <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 28 83 no odor 1 no sheen 09/13/02 75 <0 50 1 1 <0 50 <0 50 <50 no no no na no no no no 5886 36 72 odor 1 no sheen 12104/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5234 -3020 no odor 1 no sheen 02117/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 2857 no access 06102/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 84 13 <0 50 5422 32 OB no odor 1 no sheen 09/18/03 45000 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 6000 37 86 no odor 1 no sheen 11124103 ns ns ns ns ns ns 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 l n0 sheen 06107104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5554 3340 not sampled 09107104 5200 69 36 66 370 <0 50 no no no no no no no no 6208 3994 no odor 1 no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater nm=not measured MTBE=methyl-tert-butyl ether DCA=bichloroethane TOC=top of casing no not analyzed DIPS=dsssopropyl ether EDB=dibromoethane <=less than indicated reporting limit ns=not sampled ETBE=ethyl-tert butyl ether tsgfL= micrograms per liter=parts per billion(ppb) TAME=tert-amyl methyl ether 419gmrO4 xis Page 13 of 13 HORIZON ENVIRONMENTAL INC Progect No 141947