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. TA� GROUNDWATER IVfONITORING 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 TSA methanol ethanol DCA ED8 GW Elevation Elevation Number Date (ug/L MA) u !L u 1L u & u A u 1L} u !L u !L (ug/Q1 ju !L u1Lu !L u !L (feet) feet sea level (feet sea level Comments AS 1 02!21100 80000 7600 16000 1600 9100 34 <2 0 <2 0 <0 <20 380 12000 180 250 4589 nm nm slight odorino sheen screened 05118100 23000 2300 4800 480 2900 4113 <10 <10 <10 <100 44000 4100 no no 4109 nm no odortno sheen interval 09126!00 54000 2600 5300 590 3200 -50 na no no no no no no no 4913 nm stnght odor!no sheen 64 69 1221100 52000 5000 10000 1200 6000 <500 na no no no no no no no 4779 nm odorino sheen 03/27/01 140000 16000 34000 3300 18000 <500 na no no no no no no no 4665 nm odorMa sheen 0626101 140000 14000 34000 3700 16000 410 -10 <10 <10 410 <100 4100 83 140 4979 nm odorfiasheen 09105MI 21WW 17000 39000 4600 25000 <50D na no no no no na no na 5441 nm ododno sheen 11130101 150000 12000 32000 4000 19000 <2000 na no no no no no no na 5470 nm ododno sheen 02127/02 200000 11000 38000 3600 19000 <20W na no no no no no no na 5095 nm slight odorino sheen 05!16102 120000 11000 23000 2200 11000 <100 <100 4100 000 <1000 <100D0 -1000 <100 <100 5111 2242 2869 slight odor/no sheen 09173102 160004 12000 440W 5100 22000 4200 no no no no no no no no 5928 3686 odor!no sheen 12104102 110000 8300 25000 2200 12000 <50D no no no no no no no no 5750 3506 odor Inosheen 02117103 170000 18000 33000 3100 15004 <200 no no no no no no no na 5497 3255 odor!no sheen 06103103 190000 20000 38000 4200 19000 420 <20 <20 420 4200 <20D0 4200 B2 93 5371 3129 odor Inosheen AS 2 1020100 29000 140 1600 650 3100 -050 <0 50 <0 50 -0 50 <5 0 450 610 1 1 63 41 52 2076 2076 screened 12/21/00 18000 120 1200 530 2800 450 no no no no no no no na 4598 2522 slight odor I no sheen interval 0327MI 11000 91 820 230 1800 420 no no no no no no na na 4651 2575 slight odor!no sheen 123 126 06!18101 12000 80 68 220 2000 <25 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2B49 slight odor!no sheen 09105101 7400 75 31 140 1100 <20 na no no no no no no no 5329 3253 slight odor!no sheen 11/30101 6600 70 15 110 740 425 na no no no no no no no 5415 -3339 odorfioshean 0227102 3200 46 98 28 2aD <10 no no no no no no no no 50 83 -3007 ododno sheen 05116102 3500 40 10 74 410 <2 0 -20 <20 <20 -20 <200 180 <20 -2 0 5110 2232 2878 odor/no sheen 09113102 340D 120 110 89 480 410 na no no no no no no no 5937 3705 odor!no sheen 12!64!02 1400 40 12 11 110 <50 no no no no no no no na 5839 3607 no odor 1 no sheen 02117!03 420 16 49 2 8 43 <0 50 no no na no no no no no 5408 3176 no odor!no sheen 06103/03 450 27 1 2 32 90 <0 50 <0 50 -050 <0 50 <50 450 58 <0 50 <0 50 53 95 3164 no odor!no sheen AS 3 10!20100 <5o -0 50 40 50 <o 50 -050 <0 50 -050 -050 <0 50 <5 0 <50 81000 <0 50 40 50 4607 2060 2547 screened 1221100 <50 <0 50 <050 -050 <0 50 <50 na na no no no no no no 4805 2745 no odor!no sheen interval 03/27/01 <50 23 58 <0 50 <050 <50 no no no no no no no no 4682 2622 no odor!no sheen 8(7-85 06/26/01 450 <0 50 052 <o 60 -050 <050 <0 50 <0 50 <0 50 12 450 690 89 <0 50 4896 2836 no odor/no sheen 09105101 100 <0 50 <0 50 <0 50 18 <50 no na no no no no no no 5411 33 51 odor/no sheen 11130101 74 1 3 <0 50 <D!50 -050 <50 no no no no no no no no 5393 33 33 odorino sheen 0227102 73 -050 <0 50 <0 50 <D 50 <50 no na na no no no na no 5067 30 D7 no odor!no sheen 05116102 450 -050 18 <0 50 <0 50 -050 <0 50 <0 50 <0 50 <50 450 47 94 -050 5097 2214 28 B3 no odor!no sheen 09113102 75 <0 50 11 -050 <050 <50 no no na no no no no no 5886 -3672 odor/no sheen 12/04102 <50 <0 5D -050 <0 50 -050 <50 no no no no no no no no 5234 -3020 no odor!no sheen 02!17!03 ns ns ns ns ns ns AS ns ns ns ns ns ns ns 5071 2057 no access 06102103 -50 <050 <0 50 <0 50 <050 <050 <05D <050 <050 <50 450 84 13 <0 50 5422 -3208 no odor!no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater rim not measured MTBE=methyl tert�butyl ether DCA=Dtchloroethane TOC=top of casing no=not analyzed DIPE=desopropyl ether EDB=dfbromeethane <=less than indicated reporting limit ns=not sampled ETBE=ethyl lert butyl ether pg1L= micrograms per liter=parts per billion(ppb) TAME=teri amyl methyl ether 419gmrV2 As Pro,e No 1{19 45 Page 7 of 7 HORIZON RAVIRONMENTAL INC