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QUALITY CONTROL REPORT, CONTINUED <br /> JANUARY 27 , 1992 <br /> TREATEK, INC. <br /> SAMPLE LOG #946-92A THROUGH 947-92A <br /> DATE ANALYZED: JANUARY 22, 1992 <br /> I <br /> j EPA METHOD 8020 <br /> Concentrations were calculated using a 4 point curve of <br /> concentrations 2 . 5, 5, 10 and 20 ppb. <br /> I <br /> LABORATORY CONTROL STANDARD <br /> A 20 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 94% <br /> Toluene 95% <br /> Ethylbenzene 97% <br /> Xylenes 117% <br /> SPIKE DATA <br /> Log# 1132-92A was spiked in duplicate with 20 ppb 8020 <br /> standard. <br /> COMPOUND SPIKE RELATIVE <br /> % RECOVERY % DIFFERENCE <br /> Benzene 85% 17% <br /> Toluene 88% 17% <br /> Ethylbenzene 89% 14% <br /> Xylenes 99% 13% <br /> r1LIMACC <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 80%-120% RECOVERY <br /> • •SPIIrE - 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 />