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TABLE 1 GROUNDWATER MONITORING DATA Quik Stop No. 076 1030 South Olive Avenue, Stockton, California ethyl- total TOC GW Well Date TPHg benzene toluene benzene,xylenes MTBE DIPS ETBE TAME TBA DCA EDB DTW Elevation Elevation Comments Number Sampled (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet), (feet msl) (feet msl) MW-1 7/11103 210 <0 50 "<0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <0 50 <0 50 6412 nm nm no odor I no sheen screened 3115104 1000 30 110 12 56 <0 50 <0 50 <0 50 <050 63 099 095 6624 nm S nm no odor/no sheen interval 6110104 410 1 4 49 062 1 24 <0 50 <0 50 <0 50 <0 50 6 0 <0 50 <0 50 6542 nm nm no odor 1 no sheen 55'-75' 6/1105 MW-1 dnlled out, boring reamed to 10"and deepened to 80', MW-1 re-installed as 2"well 60-80' 616105 -- 160 <0 50 <0 50 <0 50 3 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 6460 3109 -3351 no odor 1 no sheen 8117105 3100 <0 50 <0 50 <0 50 ' <0 50 <0 50 na na na na na na 6630 -3421 no odor I no sheen 11/16/05 1400 <0 50 '<0 50 <0 50 , <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <0 50 <0 50 6580 -3471 no odor 1 no sheen 2/8/06—(480 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <0 50 <0 50 6366 -3257 no odor/no sheen _ 5118106 _2800 <0 50 66 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <0 50 61 10 -3001 no odor/no sheen 8/14/061 2100 068 1083 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <0 50 5975 -2866 no odor 1 no sheen Notes TPHg-total petroleum hydrocarbons as gasoline DCA-1,2-dichloroethane uglL-micrograms per liter or parts per billion(ppb) MTBE-methyl-t-butyl ether EDB-1,2-dibromoethane <-less than reporting limit given DIPE-dusopropyl ether DTW=depth to groundwater ETBE-ethyl-t-butyl ether TOC=top of casing TAME-tert-amyl methyl ether msl=mean sea level TBA-tert-butanol GW=groundwater I ' 7076gmr Project076 42 Pabof 1 HORIZON ENVIRONMI INC 4 W- i '