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TABLE 2 <br /> Historical Groundwater Monitoring 8r Analytical Bata <br /> ARCO Service Station No. 2186 <br /> 3212 North California Street,Stockton, CA <br /> Notes: <br /> GRO=Gasoline range organics <br /> B=Benzene <br /> T=Toluene <br /> E=Ethylbenzene <br /> X=Total xytenes <br /> MTBE=Methyl tert butyl ether <br /> TBA=Tert-butyl alcohol <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tent-butyl ether <br /> TAME=Tert-amyl methyl ether <br /> 1,2-DCA =1,2-Dichloroethane <br /> EDB=1,2-Dibromoethane <br /> D.O.=Dissolved Oxygen;rounded to the nearest tenth prior to first quarter 2008 <br /> SPH=Separate-phase hydrocarbons <br /> TOC=Top of casing(surveyed) <br /> Cato.GW Elev.=Calculated groundwater elevation=TOC-Depth to Water+0.75'(Measured SPH Thickness);assuming a specific gravity of 0.75 for SPH <br /> ft-MSL=feet above mean sea level <br /> mg/L=Milligrams per liter <br /> pg/L=Micrograms per liter <br /> a=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 /> For CPT wells:TPHg,B,T,E and X were analyzed by DHSILUFT Method.TBA,D1PE,ETBE,TAME,and Ethanol were analyzed by EPA Method 8260A <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 /> R=Data rejected(data determined to be unreliable by laboratory) <br /> DRY=Well dry during gauging;not sampled <br /> GAU=Well gauged,but not sampled,per monitoring program. <br /> INA=Well inaccessible;not sampled <br /> MD=Sampling&gauging performed over multiple days during this event <br /> NP=Well not purged prior to sampling <br /> NS=Well not sampled <br /> NSP=Well not sampled this event,in accordance with groundwater sampling schedule <br /> VOL=Well not sampled due to insufficient volume of water in well <br /> May 2004-The site was surveyed by Morrow Surveying. <br /> Beginning in the first quarter 2008,the carbon range for GRO was changed from C4-C12 to C6-C12. <br /> 2186 2011 Tables.xism Page 19 of 19 Stantec <br />