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Y <br /> QUALITY ASSURANCE LABORATORY <br /> QUALITY CONTROL DATA REPORT <br /> October 26, 1994 <br />' TREATEK, INC. <br /> LOG #16580-9410 THROUGH 16582-9410 <br />' DATE ANALYZED: <br /> OCTOBER 24 , 1994 - BENZENE, TOLUENE, ETHYLBENZENE, XYLENES, <br /> TPH-G <br />' PREP/ANALYSIS LCS SPIRE DUPLICATE <br /> ANALYSES METHOD $ RECOVERY $ RECOVERY RPD <br /> BENZENE 5030/8020 84% 95% 10% <br /> TOLUENE 5030/8020 93% 97% 4% <br /> ETHYLBENZENE 5030/8020 88% 87% 6% <br /> XYLENES 5030/8020 87% 91% 4% <br /> TPH-G 5030/DHS 92% 80% 1%I W.L. RUSTEBAKKE <br /> QA/QC ANALYST <br /> QUALITY CONTROL TERMINOLOGY <br /> = LABORATORY CONTROL STANDARD REPORTED AS%RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL SAMPLE PREPARATION <br /> PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTABLE RANGE IS BASED ON HISTORICAL LABORATORY CONTROL DATA AND EPA REQUIREMENTS <br /> ANY OUT OF.CONTROL OC DATA IS CLEARLY INDICATED <br /> SPIKE ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WRH METHOD COMPOUNDS AND% RECOVERY OF CONCENTRATION SPIKED INTO SAMPLE IS <br /> CALCULATED REPORTED AS%RECOVERY ACCEPTABLE RANGE FOR"NORMAL MATRIX SAMPLE"IS BASED ON HISTORICAL LABORATORY CONTROL DATA <br /> ANY OUT-OF-CONTROL OC DATA IS CLEARLY INDICATED <br /> SURROGATec <br /> �...,R COMPOUNDS REPRESENTATIVE OF AGROUPOFCOMPOUNOS SURROGATESARE SPIKED INTO ENVIRONMENTAL SAMPLES AND'k RECOVERY <br /> OF CONCENTRATION SPIKED IS CALCULATED AND REPORTED ACCEPTABLE RANGE VARIES DEPENDING ON SAMPLE MATRIX AND ANALYSIS METHOD ANY <br /> OUT-OF-CONTROL DATA IS CLEARLY INDICATED <br />