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! 0 TABLE 1 Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene eUrAbenzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevatwn Elevat= Number pate ( ) ( ) u ] (ugA) (ugA] (u ] u u } u feet) (feet msl) (feet msl) Comments VW-4 6385199 no no. ns no ns no ns ns no ns ns no ns ns nm nm nm dry screened 06IO2M no ns ns ns its ns no no. ns ns no no no no nm fin dry interval 08x31199 no no. ns ns no ns ns ns ns no ns no no no run ran dry 2540' 12/09199 no. ns ns no no ns no no. no no. ns no no ns nm run dry 03/01/00 ns ns ns ns ns ns ns no no ns ns ns ns ns nm nm cry 06106100 ns Its ns no no ns no ns ns ns ns ns no no not nm dry 09114/00 no ns no no no no no ns ns n$ no no no ns run nm dry 12112100 ns ns ns ns no ns ns ns no. no. ns ns no no nm nm dry 03119MI ns Its no no ns no ns no ns ns no no no ns rxn nm dry VW-5 03/25/99 no ns no. ns ns ns ns no ns ns no no no ns nm nm nm screened 06/02/99 ns no ns no ns no no. Its no. ns ns no no no nm nm interval 08/31/99 ns no ns ns ns ns no. ns ns ns no ns no ns 4773 nm 0 05 ft FP/sheen 40'50' 12109/99 100000 13000 10000 570 16000 31000 <20 e20 <20 <200 <2000 <200 <20 <20 4570 nm no comment 03/01/00 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 43000 7700 4600 1300 3700 16000 00 e10 <10 750 <2500 <100 <10 <10 4104 nm dear 09114100 ns ns ns ns ns ns no no ns ns ns ns no ns 4803 nm considered dry 12/12/00 16000 1000 1100 480 1800 24000 na na na na na na na na 4401 nm clear 03/19/01 29000 3300 4400 740 3000 20000 na na na na na na as na 4138 nm clear VW.B 03r25/99 ns no no no no ns no no ns no no no ns ns nm nm nm screened 06102/99 ns ns no no ns no no no ns ns no no ns no. nm nm interval 06/31199 ns ns no no no no no ns no ns ns ns ns ns 4773 nm sheen 27-37 12109199 ns ns ns ns ns ns no ns ns ns no ns ns ns run nm dry 03101100 ns ns no ns no no no ns no no ns no no no rim nm dry 06106100 ns ns ns no ns AS ns ns ns ns ns ns ns no nrn nm dry 09114100 ns ns no no ns no no ns ns ns ns no ns ns run nm dry 12112100 ns ns no no ns ns ns ns no ns as ns no ns dry nm dry 03119/01 no. ns ns ns no ns no no no no ns no no ns dry nm dry VW 7 03125!99 25000 5700 3300 1500 1700 2000 <50 <50 <50 200 <50 <50 na na 4167 rtm nm slight odor/no sheen screened 06102199 11000 3300 320 1100 230 1700 <5 o -50 <50 92 el oo -50 <50 <5 0 41 94 nm slight odor/no sheen interval 08/31/89 ns ns no ns ns no no no no ns ns ns no ns 4735 run 0 21 tt FP/sheen 4(Y 55 12109/99 87000 2300 1000 1500 5400 6400 <50 <50 <50 <5W <5" <500 <50 <50 4526 nm no comment 03*1100 11000 2200 160 640 640 4300 450 <50 <50 <500 <5000 <500 na na 4247 nm no comment 05/06/00 15000 2400 440 620 1100 3000 e50 e50 e50 280 <2000 450 <50 <5 0 41 50 nm dear 09/14/00 46000 440 560 1600 3000 1000 <50 <50 <50 76 <6W <50 <50 <50 4781 nm dearlsheen 1211 2100 17000 940 420 450 1600 5200 na na na na na na na na 4416 nm dear 03119/01 4100 650 16 180 94 2900 na na na na na na na na 4138 dear VW-8 03/25199 ns ns no ns no ns no no no no ns ns no no. dry nm nm dry screened 06/02/99 no ns no no no no no ns no ns ns ns ns ns dry nm dry interval 08131199 ns ns no ns ns ns no no no ns ns ns no ns dry nm dry 27-32' 12109199 ns no ns no no no no no no ns ns no ns no dry nm dry 03101100 ns ns no no no no ns ns ns no AS ns AS no dry nm dry 06106/00 Its Its no ns no ns no no ns no ns no ns no dry nm dry 0914100 ns ns ns ns ns no no no no no ns no no ns dry nm dry 12/12100 no ns no ns AS no no no ns ns ns ns ns ns dry nm dry 03119!01 ns ns ns ns ns ns ns ns ns no ns ns no no dry nm dry Notes TPHg-lata!pctrolcum hydrocarbons as gasulrx W=micrograms prr Irnxlparts pLe billion or ppb) MTBE-methyl"-butyl ether GW=groundwater RIPE-dusopropyl ctkr TOC=top of casing ETBE=ethyl tcrtbutyl ether na=not analy-d TAME-tcrt amyl mcthyl atm FP-frac product TBA=ten butyl alcohol 641gmr00 As 164143 Page 4 of 4 HORIZON ENVIRONMENTAL INC