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QUALITY CONTROL REPORT, CONTINUED <br /> JANUARY 16, 1992 <br /> TREATEK, INC. J; <br /> 1 <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 curvelof <br /> concentrations 2. 5, 5, 10 and 20 ppb. <br /> j <br /> LABORATORY CONTROL STANDARD <br /> A 20 ppb standard verification was run in the sample set up. <br /> j <br /> METHOD BLANK <br /> NO TARGET ANALYTES WERE DETECTED IN METHOD BLANK.- <br /> COMPOUND <br /> LANK:COMPOUND %RECOVERY ! <br /> j <br /> Benzene 97 <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 /> i <br /> COMPOUND SPIKE RELATIVE- <br /> RECOVERY % DIFFERENCE <br /> Benzene 89% 20 <br /> Toluene 69%* 10% „ <br /> Ethylbenzene 94% 8%. . <br /> Xylenes 93% 9%, <br /> * SPIKE RECOVERY OUT OF RANGE DUE TO SAMPLE MATRIX. EFFECT. <br /> 6LkSAACCL <br /> QA/QC DIRECTOR <br /> QUALITY CONTROL TERMINOLOGY <br /> •LCS - LABORATORY CONTROL STANDARD.`' REPORTED AS % RECOVERY OF AN INDEPENDENT STANDARD',jCARRIED THROUGH ALL <br /> SAMPLE PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE. ACCEPTALLE RANGE IS 80%-120% RECOVERY. <br /> -SPIKE - ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND % RECOVERY OFjCONCENTRATION SPIKED <br /> INTO SAMPLE IS CALCULATED. REPORTED{AS % RECOVERY. ACCEPTABLE RANGE FOR "NORMAL MATRIX;SAMPLE" IS 75%-125% <br /> RECOVERY. E� <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 />