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QUALITY CONTROL REPORT, CONTINUED <br /> NOVEMBER 14, 1991 <br /> TREATEK <br /> SAMPLE LOG #16576-91 THROUGH 16578-91 <br /> ' DATE ANALYZED: NOVEMBER 12 , 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 /> ' 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 99% <br /> Toluene 125% <br /> Ethylbenzene 105% <br /> Xylenes 112% <br />' SPIKE DATA <br /> Log# 16256-91 was spiked in duplicate with 15 ppb 602 <br /> standard. <br /> COMPOUND SPIKE RELATIVE <br /> $ RECOVERY % DIFFERENCE <br />' Benzene 95% 5% <br /> Toluene 103$ 13% <br />' Ethylbenzene 92% 1% <br /> Xylenes 103% 0% <br /> LISA MACC j <br />' QA/QC DIRECTOR <br /> 1 <br /> OU/LL F'y CONTROL TERMINOLOGY <br /> •LCS-LABORATORY CONTROL STANDARD REPORTED AS%RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL SAMPLE <br /> PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTABLE RANGE IS 80%-120%RECOVERY <br /> *SPIKE-ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND%RECOVERY OF CONCENTRATION SPIKED INTO <br /> SAMPLE 13 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 />