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LABORATORY CONTROL SAMPLE <br /> QUALITY CONTROL REPORT <br /> for <br /> Hydrocarbons <br /> (I Analyzed by: M. Langroodi, B. Meadows Reviewed by: C. Loukas, R. Stafford <br /> Sample Matrix: Soil Spiked Sample ID : Spiking Soil _ <br /> QC Sample ID: 060894 S-BTEX 060894 S-TPHG-Range 060694 S-TPHD-Range <br /> Twining Laboratories, Inc . Examination Number:-694-2872 . 1-10 <br /> Constituent Method LCS LCS LCS LCS LCS RPD <br /> in Blank Expected Result Dup . o Rec Dup. °s <br /> < i Result Conc. (mg/kg) Result % Rec . <br /> 'i <br /> (mg/kg) (mg/kg) (mg/kg) <br /> Benzene ND 0 . 05 0 . 056 0 . 055 112 110 2 <br /> Toluene ND 0 . 05 0 . 060 0 . 057 120 114 5 <br /> Ethylbenzene ND 0 . 05 0 . 053 0 . 052 106 104 2 <br /> Xylenes ND 0 . 10 0 . 12 0 . 1.2 120 120 0 <br /> � e TPH-Gasoline ND 2 . 6 3 . 2 2 . 9 123 112 9 <br /> Range <br /> TPH-Diesel ND 10 6 . 0 3 . 9 60 39 42 <br /> ' Z� Range <br /> � EXPLANATIONS: <br /> Method Blank: The method blank is used to determine if method <br /> analytes or other interferences are present in the <br /> .A " laboratory environment, the reagents or apparatus. <br /> Laboratory Control Sample(LCS) : A laboratory control sample is generated by spiking <br /> i the analyte into a relatively inert matrix (clean <br /> ' sand or blank water) . The laboratory control <br /> sample is analyzed exactly like a sample, and its <br /> E purpose is to determine whether the methodology is <br /> C in control and whether the laboratory is capable of <br /> making accurate and precise measurements. <br /> E <br /> RPD: Relative Percent Difference. <br /> ' ND: None Detected <br /> Dup: Duplicate <br /> I� TPH: Total Petroleum Hydrocarbons <br /> I_ <br /> mg/kg: milligrams per kilogram (}arts per million) <br /> 1 Debra . Le man <br /> QA Manager <br /> �a.3. <br /> Rev. 2 10/93 <br /> (4CSTEX S0I) <br /> ' I� <br />