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QUALITY CONTROL REPORT, CONTINUED <br /> FEBRUARY 13 , 1992 <br /> TREATEK <br /> SAMPLE LOG #1828-92A THROUGH 1.839-92A <br /> DATE ANALYZED: FEBRUARY 12, 1992 <br /> ' EPA METHOD 8020 <br /> Concentrations were calculated using a 4 point curve of <br /> concentrations 2.5, 5, 10 and 20 ppb. <br /> ' LABORATORY CONTROL STANDARD <br /> A 15 ppb standard verification was run in the sample set up• <br /> ' METHOD BLANK <br /> NO TARGET ANALYTES WERE DETECTED IN METHOD BLANK. <br /> COMPOUND %RECOVERY <br /> Benzene 86% <br /> Toluene 92% <br /> ' Ethylbenzene 101% <br /> Xylenes 108% <br /> ' SPIKE DATA <br /> A QAL Method Blank was spiked in duplicate with 15 ppb 8020 <br /> standard. <br /> COMPOUND SPIKE RELATIVE <br /> % RECOVERY % DIFFERENCE <br /> Benzene 94% 11% <br /> Toluene 96% 6% <br /> Ethylbenzene 101% 5% <br /> ' Xylenes 112% 1% <br /> ti <br /> ' LISA MACCLELLAN <br /> QA/QC DIRECTOR <br /> ' QUALITY CONTROL TERMINOLOGY <br /> •LCS - LABORATORY CONTROL STANDARD. REPORTED AS % RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL <br /> SAMPLE PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTALBE RANGE IS 8076-120% RECOVERY <br /> .SPIKE - ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND % RECOVERY OF CONCENTRATION SPIKED <br /> INTO SAMPLE IS CALCULATED. REPORTED AS % RECOVERY ACCEPTABLE RANGE FOR "NORMAL MATRIX SAMPLE" IS 75%-125% <br /> RECOVERY <br /> *SURROGATES - COMPOUNDS REPRESENTATIVE OF A GROUP OF COMPOUNDS SURROGATES ARE SPIKED INTO ENVIRONMENTAL <br /> SAMPLES AND % RECOVERY OF CONCENTRATION SPIKED IS CALCULATED AND REPORTED ACCEPTABLE RANGE VARIES DEPENDING <br /> ON SAMPLE MATRIX AND ANALYSIS METHOD. <br />