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• TAS s 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 (ug1L) (ug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (feet) (feet sea level) (feet sea level) Comments AS-2 10/20/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 4152 2076 2076 screened 12/21/00 18000 120 1200 530 2800 <60 na no no no no no no no 4598 -2522 slight odor I no sheen interval 03127/01 11000 91 820 230 1800 <20 no no na na no no no no 4651 -2575 slight odor I no sheen 123-128' 06/26/01 12000 80 68 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 -2849 slight odor I no sheen 09105/01 7400 75 31 140 1100 <20 no no na na no no no no 5329 -3253 slight odor/no sheen 11/30101 6600 70 15 110 740 <25 no na no no na no no na 5415 -3339 odorino sheen 02127102 3200 46 98 28 280 <10 no no no no no na no no 5083 -3007 odor/no sheen 05/16102 3500 40 10 74 410 <2 0 <2 0 <2 0 <20 <20 <200 180 <2 0 <2 0 51 10 2232 -2878 odor/no sheen 09/13102 3400 120 110 89 480 <10 no no no no no no na no 5937 3705 odor lno sheen 12/04/02 1400 40 12 11 110 <5 0 no no no na no no no na 5839 3607 no odor Ino sheen 02117!03 420 16 49 2 8 43 <0 50 no no no no no no no no 5408 -31 76 no odor I no sheen 06/03/03 450 27 1 2 32 Do <0 50 <0 50 <0 50 <0 50 <5 0 <50 58 <0 50 <0 50 5396 3164 no odor I no sheen 09/18/03 3800 16 094 12 66 <5 0 no no no na no no na na 6031 3799 no odor I no sheen 11!24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5880 -3648 not sampled 02!23104 2200 76 17 72 74 <0 50 <0 50 <0 50 <0 50 <5 0 <50 77 <0 50 <0 50 5523 -3291 odof I no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5578 3346 not sampled 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 12/21/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no no no 48 05 -2745 no odor I no sheen interval 03/27/01 <50 2 3 5 8 <0 50 <0 50 <5 0 no no na no no no no no 4582 2622 no odor 1 no sheen 80-85' 06/26/01 <50 <0 50 0 52 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 690 8 9 <0 50 4896 -28 36 no odor I no sheen 09/05/01 100 <0 50 <0 50 <0 50 1 8 <5 0 no no no no no no no no 6411 -3351 odorino sheen 11/30/01 74 1 3 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 53 93 -3333 odorino sheen 02/27/02 73 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na na 50 67 3007 no odor I no sheen 05/16/02 <50 <0 50 1 8 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 47 9 4 <0 50 5097 2214 -28 83 no odor 1 no sheen 09/13102 75 <0 50 1 1 <0 50 <0 50 <5 0 na no no no no no no no 5886 -3672 odor 1 no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 52 34 -3020 no odor 1 no sheen 02/17103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 -28 57 no access 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 04 13 <0 50 5422 -3208 no odor I no sheen 09/18/03 45000 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 6000 -3786 no odor I no sheen 11124!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 0 94 <0 50 059 072 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 55 04 -3290 odor I no sheen 06107104 ns ns ns ns ns ns as ns ns ns ns ns ns ns 5554 -3340 not sampled i Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater nm=not measured MTBE=methyl-tart butyl ether DCA=Dlchloroethane TOC=top of casing no=not analyzed DIPE=dnsopropyl ether EDB=dibromoethane <=less than indicated reporting limit ns=not sampled ETBE=ethyl-tert-butyl ether Ng1L= micrograms per Iger=parts per billion(ppb) TAME=tart-amyl-methyl ether Prgaci No141 a 47 419grrwNxPage 13 of 13 R09=11 ERVLROMMENTAL DFC No 1