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r TABLE 1 GROUNDWATER MON11 ORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW WeltTPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u n u A u A u ft (u9n) u A u A u R u A u & u n u n (u11)( u A feel feet msl feet msl Comments VW 7 03125199 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <50 200 <50 <5 0 net net 4167 nm nm slight odor!no sheen screened 06102199 11000 3300 320 1100 230 1700 <5 0 <5 0 <50 92 <100 <5 0 <5 0 <5 0 4194 nm slight odor 1 no sheen interval 08131199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4735 nm 0 21 It FP/sheen 40 55 12!09199 87000 2300 low 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm net comment 03/01/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na net 4247 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <5 0 <5 0 <50 280 <2000 <50 <5 0 <5 0 41 50 nm dear 09!14100 46000 440 560 1600 3000 1000 <5 0 <5 0 <50 76 <600 <50 <5 0 <5 0 4781 nm dearlsheen 12!12100 17000 940 420 450 1600 5200 net net net net net net net net 4416 nm dear 03119!01 4100 650 16 180 94 2900 na na net na na na net net 4138 nm dear 06119101 24000 2800 870 770 1Bo0 7300 net net net net net net net net 4386 nm dear 09!27101 51000 1400 3900 1800 6800 1400 net na net net net na na net 5001 nm dear 12!13101 4400 270 70 140 240 2000 net net net net net net net net 4657 nm dear 03/28/02 24000 1100 760 850 2100 2500 na na na na na na na na 4314 1929 2385 dear 06119102 36000 2600 2000 1200 4600 5100 net net net na net net net net 4489 2560 dear 09!16102 57000 2400 5000 1600 6300 2800 <10 <10 <10 150 <2500 <100 <10 <10 5D 20 3091 dear 12126/02 3100 200 30 110 78 2000 net no no no net net na ria 4745 28 16 dear VW-8 03125199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry screened 06/02199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry interval O WI% ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 22 37 12109M ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03!01!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06106!00 ns its ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09114!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12112!00 ns ns ns ns ns ns ns ns as ns ns ns ns ns dry nm dry 03/19101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09!27101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12113101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03!28!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 0619102 ns ns ns as ns ns ns ns ns ns ns ns ns ns dry nm dry 0916102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12126!02 ns ns ns as ns ns ns ns ns ns ns ns ns ns dry nm dry Notes TPHg=total petroleum hydrocarbons as gasoline µy31=mu:rograrns per liter(pans per billion or ppb) MTBE=methyl ten butyl ether GW=groundwater PIPE-dusopropyi ether TOC=lop of cwtng ETBE-ethyl ten buryl nher net=rtor analyzed TAME-ten amyl methyl ether FP=free product TBA-ten butyl alcohol 641gmr01 As 164122 Page 7 of 7 HORIZON ENVIRONMENTAL INC