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Table 4 <br /> ' Total Extractable Petroleum Hydrocarbons as Diesel Groundwater Analytical Results <br /> Union Pacific Railroad Company <br /> Former Maintenance Facility, Tracy, California <br /> ' 2009/2010 Annual Groundwater Monitoring Report <br /> Cleanup Levels Total Petroleum <br /> CAO 92-7071 H drocarbona 100 1 W <br /> ' Monitoring Well Sample Date TEPH-d(pg/L) TEPH-d SG' (pg/L) Notes <br /> TW-04 08/15/01 470 65 <br /> ' 11/19/01 1,400 180 <br /> 11/18/02 2,500 x 1,800 x <br /> 03/27/03 2,300 x,J 1,300 x,J b <br /> 11/02/04 2,000 x 1,200 x <br /> 03/08/06 81,000 NJ 81,000 NJ <br /> Dup 03/08/06 78,000 NJ 74,000 NJ <br /> 12/28/06 6,600 J NA C <br /> ' 03/20/07 NA 3,400 <br /> 11/29/07 FP FP <br /> 03/20/08 FP FP <br /> ' 11/21/08 FP FP <br /> 03/16/09 FP FP <br /> 11/19/09 FP FP <br /> 03/16/10 FP FP <br /> Notes&Key: <br /> a Samples with detectable TEPH as diesel were reanalyzed using a silica gel cleanup sample preparation <br /> ' b Sample results qualified due to samples exceeding temperature range upon receipt at the laboratory <br /> ` Sample results qualified due to high surrogate recoveries <br /> ° Reported as an unknown hydrocarbon within the diesel range <br /> ' pg/L=Micrograms per liter <br /> Values in bold type exceed the cleanup level of 100 pg/L for TEPH diesel as stated in California Regional Water <br /> Quality Control Board-Central Valley Region Cleanup and Abatement Order(CAO)92-707 <br /> Silica gel cleanup performed using United States Environmental Protection Agency(USEPA)Method 3630C <br /> ' DUP=Duplicate sample <br /> FP=Free product present;no sample collected <br /> NA=Not analyzed <br /> ND<=Denotes constituent not detected at or above reporting limit listed after the less-than sign <br /> ' SG=silica gel cleanup preparation <br /> TEPH-d=Total extractable petroleum hydrocarbons as diesel <br /> TEPH-d analyzed using USEPA Method 80158 <br /> ' Data Qualifiers(Laboratory) <br /> a=The diesel pattern appears degraded <br /> x=Results within quantitation range;chromatographic pattern not typical of fuel <br /> h=Sample analyzed outside the recommended holding time <br /> G=The reporting limit is elevated due to matrix interference <br /> '=Surrogate recovery is outside stated control limits <br /> Data Qualifiers(Quality Assurance Review of Sample Data Collected Before December 2006) <br /> ' J=Detected value considered estimated based on quality assurance review <br /> NJ=Estimated value-chromatogram did not resemble the standard hydrocarbon pattern <br /> UJ=Compound not detected at an estimated value based on quality assurance review <br /> ' Data Qualifiers(Quality Assurance Review of Sample Data Collected After March 2006) <br /> U=The analyte was analyzed for,but was not detected above the level of the adjusted Contract-Required <br /> Quantitation Limit(CRQL)for the sample and method. <br /> J=The analyte was positively identified;the associated numerical value is the approximate concentration of the <br /> ' analyte in the sample. <br /> ' UP Tracy Annual Tables 2010_OC'd_AAV.xlsx ARCADIS Page 9 of 9 <br />