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1W <br /> QUALITY CONTROL REPORT, CONTINUED <br /> AUGUST 26, 1991 <br /> ADVANCED SCIENCES, INC. (ASI) <br /> SAMPLE LOG #12144-91 THROUGH 12146-91 <br /> DATE ANALYZED: AUGUST 21-22 , 1991 <br /> EPA METHOD 8020 <br /> Concentrations were calculated using a 4 point curve of <br /> concentrations 2. 5, 5, 10 and 20 ppb. <br /> CONTINUING CALIBRATION CURVE VERIFICATION <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 113% <br /> Toluene 114% <br /> Ethylbenzene 116% <br /> Xylenes 117% <br /> SPIKE DATA <br /> Log #11061-91 was spiked in duplicate with 15 ppb 8020 <br /> standard. <br /> COMPOUND SPIKE RELATIVE <br /> % RECOVERY % DIFFERENCE <br /> Benzene 105% 11% <br /> Toluene 105% 11% <br /> Ethylbenzene 107% 12% <br /> Xylenes 106% 13% <br /> i <br /> l� <br /> LISA MAC�C �dN <br /> QA/QC DIRECTOR <br /> QUALITY CONTROL TERMINOLOGY <br /> OCCCV-CONTINUING CALIBRATION CURVE VERIFICATION. REPORTED AS%RECOVERY OF AN INDEPENDENT STANDARD TO VERIFY <br /> LINEARITY OF THE OPERATING STANDARD CURVE.ACCEPTABLE RANGE IS 80%-120%RECOVERY. <br /> •SPIKE-ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND%RECOVERY OF CONCENTRATION SPIKED INTO <br /> SAMPLE IS CALCULATED.REPORTED AS%RECOVERY.ACCEPTABLE RANGE FOR"NORMAL MATRIX SAMPLE-IS 75%-125%RECOVERY. <br /> -SURROGATES-COMPOUNDS REPRESENTATIVE OF A GROUP OF COMPOUNDS.SURROGATES ARE SPIKED INTO ENVIRONMENTAL SAMPLES <br /> AND%RECOVERY OF CONCENTRATION SPIKED IS CALCULATED AND REPORTED.ACCEPTABLE RANGE VARIES DEPENDING ON SAMPLE <br /> MATRIX AND ANALYSIS METHOD. <br />