Laserfiche WebLink
Table 1 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> Well IDI Ethyl- MtBE I Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE I TBADIPE EtBE TAME Notes Oxygen DTW SPT WTE <br /> TOC (Ug/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) ({ig/L) (pg/L) (pglL) (mg/L) (feet) (feet) (feet) <br /> MW-6 <br /> 04/10/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.1 <5 <0.5 <0.5 <0.5 6.0 6.70 0.00 -- <br /> 2.38 07/10/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.3 <5 <0.5 <0.5 <0.5 1.4 7.12 0.00 -4.74 <br /> 10/16/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.4 <5 <0.5 <0.5 <0.5 1.0 7.40 0.00 -5.02 <br /> 03/26/03 <0.50 0.91 <0.50 0.84 <50 -- 2.3 <5.0 <0.50 <0.50 <0.50 1.3 6.56 0.00 -4.18 <br /> 05/20/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.4 <5.0 <0.50 <0.50 <0.50 d 0.6 6.77 0.00 -4.39 <br /> 08/01/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.1 <5.0 <0.50 <0.50 <0.50 0.2 7.41 0.00 -5.03 <br /> 10/23/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.4 <5.0 <0.50 <0.50 <0.50 1.4 6.76 0.00 -4.38 <br /> 01/12/04 <0.50 <0.50 <0.50 <0.50 <50 -- 33 66 <0.50 <0.50 <0.50 0.7 5.58 0.00 -3.20 <br /> MW-7 <br /> 04/10/02 <5 7.7 <5 5.2 <500 13,000 22,000 <5,000 <500 <500 <500 5.7 7.20 0.00 -- <br /> 2.73 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1,000 <1,000 1.3 7.65 0.00 -4.92 <br /> 10/16/02 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 1.2 7.95 0.00 -5.22 <br /> 03/26/03 <100 <100 <100 <100 <10,000 -- 56,000 28,000 <100 <100 <100 0.7 7.14 0.00 -4.41 <br /> 05/20/03 <200 <200 <200 <200 <20,000 -- 54,000 44,000 <200 <200 <200 0.4 7.33 0.00 -4.60 <br /> 08/01/03 <100 <100 <100 <100 <10,000 -- 47,000 38,000 <100 <100 <100 0.1 7.94 0.00 -5.21 <br /> 10/23/03 <100 <100 <100 <100 <10,000 -- 44,000 55,000 <100 <100 <100 1.4 7.23 0.00 -4.50 <br /> 01/12/04 <50 <50 <50 <50 <5,000 -- 25,000 56,000 <50 <50 <50 0.3 6.13 0.00 -3.40 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pg/L=micrograms per liter <br /> MtBE=Methyl-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=Diisopropyl ether WTE=Water table elevation <br /> EtBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03/26/03 sample date provided by Shaw EU <br /> Samples analyzed using EPA Method 82608 starting with 03/26/03 sample date. <br /> a=Method Blank Contamination. Method blank contains target analyte at a reportable level. <br /> b=Estimated Benzene result. Result concentration exceeds the calibration range. <br /> c=Elevated reporting limit for MtBE,TBA,DIPE,EtBE. The reporting limit is elevated due to matrix interference. <br /> Id=Matrix Spike/Matrix Spike Duplicate Results for MtBE were affected by the analyte concentration already present in the un-spiked sample. <br /> I:\7-Eleven\7-11 Stores\20632\Tables\20632 04-1 Q.xlsHistorical Water Page 6 of 6 <br />