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=, ,rs QUALITY CONTROL REPORT, CONTINUED <br /> •` JANUARY 16 , 19 9 t i r <br /> TREATEK, INC. <br /> SAMPLE LOG #270-92A THROUGH 285-92A <br /> DATE ANALYZED_ JANUARY 9- 13 , 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 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 /> i <br /> Benzene 9716 <br /> Toluene 95% <br /> Ethylbenzene 93% <br /> Xylenes 94% <br /> SPIKE DATA <br /> Log# 285-92A was spiked in duplicate with 20 ppb 8020 <br /> standard. <br /> COMPOUND SPIKE RELATIVE <br /> RECOVERY % DIFFERENCE <br /> Benzene 89% 2% <br /> — Toluene 69%* 10% <br /> Ethylbenzene 94% 8% <br /> Xylenes 9316 9% <br /> * SPIKE RECOVERY OUT OF RANGE DUE TO SAMPLE MATRIX EFFECT. <br /> n <br /> L SA MACCL LL <br /> QA/QC DIRECTOR <br /> MIALITY CONTROL TERMINOLOGY <br /> - •LCS - LABORATORY CONTROL STANDARD. REPORTED AS X RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL <br /> SAMPLE PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE. ACCEPTALBE RANGE IS 8C%-120% RECOVERY <br /> •SPIKE - ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD CCMPCUNDS AND % RECOVERY OF CONCENTRATION SPIKED <br /> INTO SAMPLE IS CALCULATED REPORTED AS % RECOVERY. ACCEPTABLE RANGE FOR "NORMAL MATRIX SAMPLE" IS 75%-1Z5% <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 />