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SLE1 , 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 I(u L) (ug/L (uglL) (ug1L) (uglL) (ug1L) (u IL) (u !L) (u 1L) (ug/L) (u L) (u IL) u L) u 1L) (feet) (feet sea level) (feet sea level) Comments AS-3 10120/00 <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!21100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4805 -2745 no odor 1 no sheen interval 03/27/01 <50 23 58 <0 50 <0 50 <5 0 na na na na na na na na 4682 -2622 no odor 1 no sheen 80'-85' 06/26101 <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 1 no sheen i 09/05101 100 <0 50 <0 50 <0 50 18 <5 0 na na na na na na na na 5411 3351 odorino sheen 11130/01 74 13 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5393 3333 odorino sheen 02/27/02 73 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5067 -3007 no odor!no sheen 05/16102 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 47 9 4 <0 50 50 97 2214 -2883 no odor 1 no sheen 09/13102 75 <0 50 1 1 <0 50 <0 50 <50 na na na na na na na na 5886 -3672 odor 1 no sheen 12104/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5234 -3020 no odor 1 no sheen 02!17103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5071 -2857 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 84 13 <0 50 5422 -3208 no odor 1 no sheen 09/18/03 45000 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 6000 -3786 no odor 1 no sheen 11/24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5864 -3650 not sampled 02123104 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 ns ns ns ns ns ns ns ns 5554 -3340 not sampled 09107104 5200 69 36 66 370 <0 50 na na na na na na na na 6208 -3994 no odor I no sheen 12/10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5958 3744 not sampled 03/09105 690 41 15 <0 50 067 <0 50 <0 50 <0 50 <0 50 <5 0 <50 67 99 <0 50 5554 3340 odor 1 no sheen 05/24105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 1101 -2889 not sampled 08131!05 160" 18 <0 50 <0 50 062 <50 na na na na na na na na 5640 3426 odor 1 no sheen 12112!05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5326 -31 12 not sampled Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert-butanol GW=groundwater nm=not measured MTBE=methyl-tert-butyl ether DCA=Dichloroethane TOC=top of casing na=not analyzed RIPE=diisopropyl ether EDB=dibromoethane <=less than indicated reporting limit ns=not sampled ETBE=ethyl-tert-butyl ether pg1L= micrograms per liter=parts per billion(ppb) TAME=tert-amyl-methyl ether '=does not exhibit typical gasoline chromatographic pattern 419gmr45 Project No 141948 Page 16 of 16 HORIZON ENVEItONMENTAL INC