Laserfiche WebLink
Table 3 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,CA <br /> Well IDI Ethyl- MtBE 1,2- Meth- Eth- Ace- 11301ssolvedElevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol tone Notes xygen OTW SPT WTE <br /> TOC /L /L /L /L /L IL /L /L /L /L /L !L !L /L /L /L (mg/L feet feet feet <br /> d <br /> MW-8 <br /> 1.90 09/18/03 25 130 64 340 3,200 2.2 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 <8.0 c 0.8 10.61 0.00 -8.71 I <br /> 12/02/03 2.2 4.3 4.7 13 320 0.79 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 - 0.0 9.85 0.00 -7.95 <br /> 03/03/04 56 140 59 360 2,500 67 140 <0.50 <0.50 <0.50 <0.50 <0.50 - - d 0.3 7.47 0.00 -5.57 <br /> 06/09/04 85 200 63 370 3,500 110 130 <0.50 <0.50 <0.50 <0.50 <0.50 -- 0.2 8.99 0.00 -7.09 <br /> 09/16/04 32 60 12 68 670 -- 61 65 <0.50 <0.50 <0.50 <0.50 <0.50 - - 1.8 10.52 0.00 -8.62 <br /> 12/21/04 <0.50 <0.50 <0.50 <0.50 <50 -- <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - 1.0 10.15 0.00 -8.25 <br /> 01/28/05 1.0 1.2 <0.50 0.75 <50 4.2 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 -- 0.7 8.83 0.00 -6.93 1 <br /> I ; <br /> 06/27/05 25 51 28 150 1,100 - 76 79 <0.50 <0.50 <0.50 <0.50 <0.50 -- 1.5 8.29 0.00 -6.39 <br /> 09/30/05 120 220 100 480 3,300 - 190 170 <0.50 <0.50 <0.50 <0.50 <0.50 - 2.5 8.89 0.00 -6.99 <br /> 12/09/05 24 45 40 160 1,200 180 150 <0.50 <0.50 <0.50 <0.50 <0.50 - 0.9 9.23 0.00 -7.33 i <br /> 03/03/06 12 19 34 150 1,100 -- 250 230 <0.50 <0.50 <0.50 <0.50 <0.50 1.3 7.22 0.00 -5.32 <br /> 06/23/06 40 62 43 190 1,300 270 230 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 2.4 8.29 0.00 -6.39 <br /> 09/15/06 14 28 13 69 500 - 180 130 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 0.3 9.67 0.00 -7.77 <br /> 12/01/06 0.72 1.1 0.69 2.5 <50 - 91 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - 4.0 9.81 0.00 -7.91 <br /> 03/02/07 <0.50 <0.50 <0.50 <0.50 <50 - 1.6 9.5 <0.50 <0.50 <0.50 <0.50 <O.50 - - - g 3.9 8.39 0.00 -6.49 <br /> 03/16/07 - - - - - - - - - - - - - - h 8.29 0.00 -6.39 <br /> 05/03/07 1.5 2.0 0.84 3.2 <50 4.6 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 1.7 8.56 0.00 -6.66 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert-butyl ether 1,2-DCA=1,2-dichloroethane pg/L=micrograms per liter <br /> TBA=Tert-Butanol EDB=1,2-dibromoethane mg/L=milligrams per liter <br /> DIPE=Diisopropyl ether DTW=Depth to water -=Not sampled/not measured <br /> EtBE=Ethyl-tert-butyl ether SPT=Separate-phase hydrocarbon thickness =Samples collected from MW-2 and MW-3 assumed to have been switched <br /> WTE=Water table elevation in the field.Second quarter 2007 sampling event on May 3,2007,provides <br /> confirmation of this assumption. <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E81.BTEX,TPHg and MtBE analyzed using EPA Method 8020/8015 Modified. <br /> Samples analyzed by EPA Method 8260B starting with 03/17/03 sample date. <br /> a=Method Blank Contamination. The associated method blank contains the target analyte at a reportable level. <br /> b=Matrix Spike/Matrix Spike Duplicate for the analytes Benzene,MtBE was affected by the analyte concentrations already present in the un-spiked sample. <br /> c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound. <br /> d=Matrix Spike/Matrix Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample. <br /> e=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern. <br /> f=Matrix Spike/Matrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un-spiked sample. <br /> g=This sample was analyzed by EPA Method 8260B using bottles that contained headspace bubbles greater than 1/4 inch in diameter. <br /> In=Depth to water monitored again per request of San Joaquin County Environmental Health Department. <br /> i=Samples collected from MW-2 and MW-3 assumed to have been switched in the field and subsequent laboratory report. May 2007 sampling event provides confirmation of this assumption. March 2007 analytical results for MW-2 and MW-3 <br /> have been posted/adjusted accordingly. <br /> 117-Eleven\7-11 Stores\14117\Tables\14117 Current Groundwater.xlsHistorical Water Page 9 of 9 <br />