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TABLE 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 DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L (ug/L (uA) (u1—)( u u u IL u u 1L u (ug/L u !L u !L feet feel sea level feet sea level Comments AS-2 10120/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 41 52 2076 2076 screened 12121100 18000 120 1200 530 2800 <50 na no no no no no no no 4598 2522 slight odor I no sheen interval 03/27/01 11000 91 820 230 1800 <20 no no na no no no no na 4651 2575 slight odor!no sheen 123 128 08/26/01 12000 80 68 220 2000 <2 5 <25 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2649 slight odor 1 no sheen 09!05101 7400 75 31 140 1100 <20 no na no no no no no no 5329 3253 slight odor 1 no sheen 11/30/01 6600 70 15 110 740 <25 no no no no no no no no 54 15 3339 odortno sheen 02127102 3200 46 98 28 280 <10 no no no no na no no na 50 83 3007 odorino sheen 05/16/02 3500 40 10 74 410 <2 0 <2 0 <20 <2 0 <20 <200 180 <2 0 <2 0 51 10 2232 2878 odorino sheen 09/13/02 3400 120 110 89 480 <10 no no no no no no no no 5937 3705 odor l no sheen 12/04/02 1400 40 12 11 110 <5 0 no no no no no na no no 5939 3607 no odor I no sheen 02/17103 420 16 49 28 43 <0 50 no no no no no no no no 5408 31 76 no odor 1 no sheen 06!03/03 450 27 12 32 90 <0 50 <0 50 <0 50 <0 50 <50 <50 58 <0 50 <0 50 5396 3164 no odor I no sheen 09118103 3800 16 094 12 66 <50 no no no no no no no no 6031 3799 no odor 1 no sheen 11124103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5880 3648 not sampled 02123/04 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 I no sheen 06107/04ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5578 3346 not sampled 09/07/04 1200 '050 '050 <0 50 <0 50 <0 50 no no no no na no no no 6236 -4004 no odor 1 no sheen 12!10!04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5978 3746 not sampled 03/09/05 55 088 60 096 27 <0 50 <0 50 <0 50 <0 50 <5 0 <50 15 <0 50 <0 50 5605 3373 odor I no sheen 05124105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51 25 2893 not sampled 08131/05 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no rho no no 5670 3438 no odor/no sheen AS-3 '10120100 <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 12/21/00 <50 <0 50 <0 50 <0 50 -050 <50 no no no na no no na no 4805 2745 no oda 1 no sheen interval 03127/01 <50 23 58 <0 50 <0 50 <50 na no no no no no no no 4682 2622 no odor I no sheen 80-85 06126N1 c50 <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 I no sheen 09105101 100 <0 50 <0 50 <0 50 18 <50 no no no no no no no no 5411 3351 odortno sheen 11/30101 74 13 <0 50 <0 50 <0 50 <50 no no no no no no no no 5393 3333 odortno sheen 0MV02 73 <0 50 <0 50 <0 50 -050 <5 0 no no no no no no na no 5067 3007 no odor I no sheen 05/16/02 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 47 94 <0 50 5097 2214 2893 no odor I no sheen 09/13102 75 <0 50 1 1 <0 50 <0 50 <5 0 no no no no no no no no 5886 36 72 odor!no sheen 12104102 <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 02117103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 2857 no access 06/02103 <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 3208 no odor)no sheen 09118/03 45000 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 6000 3786 no odor I no sheen 11/24/03 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 1 no sheen 06/07/04 ns ns ns ns ns ns its ns ns ns ns ns ns ns 5554 3340 not sampled 09/07104 5200 69 36 65 370 <0 50 no no no no no no no no 6208 39 94 no odor I no sheen 12/10/04 ns ns ns ns ns ns AS ns ns ns ns ns ns ns 5958 3744 not sampled 03/09/05 690 41 15 <0 50 0 67 <0 50 <0 50 <0 50 <0 50 <5 0 <50 67 99 <0 50 5554 3340 odor I no sheen 05/24/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51 03 2889 not sampled 08/31/05 160 1 6 <0 50 <0 50 062 <5 0 no no no no no no no no 56 40 3426 oda!no sheen i Notes TPHg=total petroleum hydrocarbons as gasoline THA=tert-butanol GW=groundwater nm=not measured MTBE=methyl ten-butyl ether DCA=Dlchloroethane TOC=top of casing no=not analyzed DIPE=dnsopropyl ether EDB=dlbromoathane <=less than indicated reporting limit ns=not sampled ETRE=elhyl tart-butyl ether pgIL= micrograms per liter=parts per billion(ppb) TAME=ten amyl-methyl ether "=does not exhibit typical gasoline chromatographic pattern If9gm Propel P46 13 HORIZON SNV6*AL INC +