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TABLE 3 <br /> Historical Groundwater Monitoring &Analytical Data <br /> Stockton Charter Way Commingled Plume <br /> 440, 441, and 508 West Charter Way and 1444 South Lincoln Street, Stockton, CA <br /> Notes: <br /> GRD=Gasoline range organics <br /> B=Benzene <br /> T=Toluene <br /> E=Ethylbenzene <br /> X=Total xylenes <br /> MTBE=Methyl tert-butyl ether <br /> TBA=Tert-butyl alcohol <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tert-butyl ether <br /> TAME=Tert-amyl methyl ether <br /> 1,2-DCA =1,2 Dichloroethane <br /> EDB=1,2 Dibromoethane <br /> McOH=Methanol <br /> D.O.=Dissolved Oxygen <br /> SPH=Separate phase hydrocarbons <br /> TOC=Top of casing(surveyed)to NAVD 88 on September 29 and 30,2010 by Stantec Consulting <br /> Calc.GW Elev.=Calculated groundwater elevation=TOC-Depth to Water+0.75'(Measured SPH Thickness);assuming a specific gravity of 0.75 for SPH <br /> mg/L=Milligrams per liter <br /> pg/L=Micrograms per liter <br /> <=Analyte was not detected above the specified method reporting limit. <br /> -=Not measured or analyzed <br /> Refer to the reports in which data was first presented for more information on historical data. <br /> (##)=Discrete sample depth in feet bgs <br /> A= TX wells were collected as split samples from Blaine Tech via disposable bailer. <br /> B= TX wells were collected as split samples afterwards via Waterra system. <br /> BTEX,MTBE and oxygenates analyzed by EPA Method 8260B <br /> DEST=Well destroyed;no sampling performed <br /> DRY=Well dry during gauging;not sampled <br /> DUP=Duplicate sample <br /> INA=Well Inaccessible <br /> J=Estimated value(less than the method reporting limit and greater than or equal to the method detection limit) <br /> N=Identity of contaminant uncertain(hydrocarbon pattern atypical of indicated analyte);see lab report <br /> NS=Well not sampled <br /> NSP=Well not sampled this event,in accordance with groundwater sampling schedule <br /> R=Data rejected(data determined to be unreliable by laboratory);well resampled to obtain valid result <br /> Beginning in the first quarter 2008,the carbon range for GRO was changed from C4-C12 to C6-C12. <br /> Former ARCO 2168-DO data collected for MWA 0 on May 05,2008 may be anomalous based on the historical trends. <br /> Former ARCO 2168-DO data collected on July 23,2009 may be anomalous based on the historical trends. <br /> Chevron#9-2033-GRO data collected on 08/04/08 for wells MW-2,MW-3,MW-4A,MW-4C,and MW-6A may be anomalous based on the historical trends. <br /> Chevron#9-2033-DRO data collected on 10/14/09 may be anomalous based on the historical trends. <br /> Former Colombo/Toscana Bakery-DO data collected for MW-4A,TX-MW-21-80,and TX-MW-8-50 on 07/22/09 may be anomalous based on the historical trends. <br /> Former Colombo/Toscana Bakery-DO data collected for MW-7S on 01/16/07 may be anomalous based on the historical trends. <br /> Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 72 of 72 Stantec <br />