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TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California t ethyl- 1, 11 11 Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L u IL u u A u IL u 1L l u L u lL u u !L u R.1 ffeet) feet sea level feet sea level Comments AS 2 10/20100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 -050 <5 0 <50 610 1 1 63 4152 2076 2076 screened 12!21100 18000 120 1200 530 2800 I<50 no ina no no na na no no no 4598 2522 slight odor/no sheen interval 03127101 11000 91 820 230 1800 X20 na no no no no no no 46 51 2575 slight odorl no sheen 123 128 06126101 12000 80 58 220 2000 <2 5 <2 5 <2 5 <2 5 <25 <250 <50 <2 5 50 4925 2849 slight odor 1 no sheen 09105!01 7400 75 31 140 1100 X20 na `dna na na na no no no 5329 3253 slight odor 1 no sheen 1 t130101 6600 70 15 110 740 <25 no f no no no no no no na 5415 3339 odor/no sheen 02127102 3200 46 98 28 280 1<10 no Ina no no no no no no 5083 3007 odorino sheen 05116102 3500 40 10 74 410 1�2 0 <20 <2 0 <2 0 <20 <200 180 <2 0 <20 5110 2232 2878 odorino sheen 09113102 3400 120 110 89 480 <10 no na no no no no no no 5937 3705 odor!no sheen 12104102 1400 40 12 11 110 <5 0 no na no no no no no no 5839 3607 no odor 1 no sheen 02!17/03 420 16 49 28 43 <0 50 no no no no no no no no 5408 31 76 no odor!no sheen 06103/03 450 27 12 32 90 <0 50 <0 50 <0 50 <0 50 <5 0 <50 58 <0 50 <0 50 5396 3164 no odor 1 no sheen 09118/03 3800 16 094 12 66 <50 no no no no no no no no 6031 3799 no odor I no sheen 11124/03 ns ns ns its ns ns ns Ins ns ns ns ns ns ns 5880 3648 not sampled 02123/04 2200 76 1 7 72 74 <0 50 1<0 50 <0 50 <0 50 <5 0 <50 77 <0 50 <0 50 5523 3291 odor 1 no sheen 06107/04 ns ns ns ns ns Ins ns Ins ns ns ns ns ns ns 5578 3346 not sampled I 091'07(04 1200 -050 <0 50 -050 -050 050 na no no no na no no no 6236 -4004 no odor I no sheen 12/70104 ns ns ns ns n4 I ns ns I ns ns ns ns ns ns ns 5978 3746 not sampled 03109105 55 088 60 096 27 <0 50 *51 <0 50 <0 50 <5 0 <50 15 4150 1111 1615 3373 odor 1 no sheen 05/24/05 ns ns ns ns ns ns no J�ns ns ns ns ns ns ns 51 25 2893 not sampted 08!31105 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no no 5670 3438 no odor 1 no sheen I AS 3 10120/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0W <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 2547 I screened 12121100 <50 <0 50 <0 50 <0 50 <0 50 II 5 0 no II na no no no no no no 4805 2745 no odor I no sheen interval 03127101 <50 23 58 <0 50 <0 50 <5 0 na 1 no na no na no no no 4682 2622 no odor 1 no sheen 80-85 06126/01 <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 I no sheen f 09105/01 100 <0 50 <0 50 <0 50 1 a P`5 0 na �na na no na no na no 5411 33 51 odor/no sheen 11/30/01 74 13 <0 50 <0 50 <0 50 <5 0 no no na no no no na no 5393 3333 odor/no sheen 02127/02 73 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na na 5067 3007 no odor 1 no sheen 05116/02 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 47 94 <0 50 10117 2114 1113 no odor I no sheen 09ft 3102 75 <0 50 i 1 <0 50 <0 50 1<5 0 na na na na no na no na 5886 3672 odor I no sheen 12104)02 <50 <0 50 <0 50 <0 50 <0 50 450 I na no no no no no no na 5234 3020 no odor I no sheen l 02117/03 ns ns ns ns ns 11 ns ns ns ns ns ns ns ns ns 5071 2857 no access f 1 06/02103 <50 <0 50 <0 50 <0 50 -050 '050 '.0 50 <4 50 <0 50 <5 0 <50 84 13 <0 50 54 22 32 OB no odor!n0 Sheen 09118103 45000 <0 50 <0 50 <0 50 <0 50 1<5 0 �r no I no no no no no no no 6000 3786 no odor 1 no sheen 11/24/03 ns ns ns ns ns ns f4 ns ns ns ns na ns ns ns 5864 3650 not sampled 02/23104 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 I no sheen 06107/04 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 na no no no no 6208 3994 no odor I no sheen 12110144 ns ns ns ns ns I ns ns ��ns ns ns ns ns ns ns 5958 3744 not sampled 03/09105 690 41 1 5 <0 50 067 <0 50 <0 50 <0 50 <0 50 <50 <50 67 99 <0 50 5554 3340 odor I no sheen 05)24/05 ns ns ns ns ns ns ns I ns Its ns ns ns ns ns 5103 2889 not sampled 08131/05 160` 18 <0 50 <0 50 062 1,50 no no no no no no no na 5640 3426 odor 1 no sheen I Notes TPH9=total petroleum hydrocarbons as gasoline TBA=le4-butanol GW=groundwater nm=not measured l MTBE=methyl tort butyl ether DCA=Dichlorcethane TOC=top of casing no not analyzed RIPE=dnttsopropyl ether EDB=dibromoeit <=less than indicated reporting limit ns=not sampled STBE=ethyl cert butyl ether Ipg/L= micrograms per liter=parts per bil;mn(ppb) TAME=tert-amyt-methyl ether '=does not exhibit typical gasoline chromatographic pattern 4 tray + pq j P 13 HORIZON BNVIH AL INC