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LABORATORY CONTROL SAMPLE <br /> QUALITY CONTROL REPORT <br /> for <br /> Hydrocarbons <br /> iwmalyzed by: S . Cowling, M. LancTroodi Reviewed by: R. Stafford <br /> Sample Matrix: Water Spiked Sample ID: Spiking Water <br /> ' QC Sample ID: 062894 S-BTEX 062894 S-TPHG-Range 062894 —S-TPI-ID-Range <br /> Twining Laboratories, Inc. Examination Number: 694-3362 . 1-3 <br /> Constituent Method LCS LCS LCS LCS LCS RPD <br /> ' Blank Expected Result Dup, o Rec Dup. o <br /> Result Conc. (ug/L) Result o Rec. <br /> (ug/L) (ug/L) (ug/L) <br /> ' Benzene ND 20 13 12 65 60 8 <br /> Toluene ND 20 25 23 125 115 8 <br /> ' Ethylbenzene ND 20 28 25 140 125 11 <br /> Xylenes ND 40 42 42 105 105 0 <br /> TPH-Gasoline ND 260 240 242 92 93 1 <br /> Range <br /> TPH-Diesel ND 400 143 183 36 46 24 <br /> 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 /> laboratory environment, the reagents or apparatus. <br /> Laboratory Control Sample(LCS) : A laboratory control sample is generated by <br /> ' spiking the analyte into a relatively inert matrix <br /> (clean sand or blank water) . The laboratory <br /> control sample is analyzed exactly like a sample, <br /> and its purpose is to determine whether the <br /> ' methodology is in control and whether the <br /> laboratory is capable of making accurate and <br /> precise measurements. <br /> RPD: Relative Percent Difference <br /> ' ND: None Detected <br /> TPH: Total Petroleum Hydrocarbons <br /> Dup: Duplicate <br /> ug/L: micrograms per Liter (parts per billion) <br /> ' Debra K. LehmaiV- <br /> QA Manager <br /> Rev. 2 10/93 <br /> (QCBTEX.WAT) <br />