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Table 2 <br /> Historfcal Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> W <br /> ell E1ftyl- �a = MtBE - r 1,2- Eth- Meth- Dlssoiveci = <br /> Date Benzene Totuene Benzene Xylene TA--6 8020- MtBE y TBA DIPE- -EtBE. ,TAME DCA 'anol can'ol Nates Oxy en DTW SPT _WTE <br /> pgli} WIL ( } a (0gllLl } s (► }:' (I+g�) _wg►t-}. ,-(Pgn}� T_(t+sn 1` (pari} '(tom} (mg-} [` } _ [ b _ 't1aet}` ( ifeet} <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA-1 2-Dichloroethane pgIL=micrograms per liter <br /> MtBE=MethyV-tert-butyl ether DTW=Depth to water mg/L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> DIPE=Diisopropyf ether WTE=Water table elevation <br /> EtBE=Ethyi-tert-butyl ether TQC=Top of casing elevation in feet above mean sea level <br /> TAME=Tert-amyl-methyl ether <br /> Notes <br /> Historical data prior to 03/07103 sample date provided by Shaw Et£I BTEX,TPHg and MtBE analyzed using EPA Method 802018015 Modified <br /> Samples analyzed using EPA Method 82606 starting with 03/11/03 sample date <br /> a=Deep zone well <br /> b=laboratory results for the 11/04199 samples collected from the nested wells MWA and MWAA were switched The table shows corrected data <br /> c=Method Blank Contamination The method blank contains the targeted analyte at a reportable level <br /> d=Data Missing from Shaw's Historical Table <br /> e=Matnx SpikefMatnx Spike Duplicate Results for Benzene Toluene and MtBE were affected by the analyte concentration already present in the un-spiked sample <br /> f=Samples from MW-5 and MW-5A tnadvertentty sampled from the wrong well rasing on 3111103 and 6127/03 The sample reported as"MW-5"was collected from MW-5A and the sample reported as"MW-5A"was <br /> collected from MW-5 <br /> Ig=Hydrocarbons from TPHg do not exhibit Gasoline chromatographic pattern for sample MW-5A <br /> I <br /> i <br /> I V-Ele,*1 Stares1199761Tabtes119976 Current Groundwater xlsHistoncal Water 11 of 11 <br />