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' QUALITY ASSURANCE LABORATORY <br /> QUALITY CONTROL DATA REPORT <br /> FEBRUARY 13 , 1992 <br /> ' TREATEK, INC. <br /> LOG #1828-92A THROUGH 1839-92A <br /> DATE EXTRACTED: FEBRUARY 6, 1992 <br /> tDATE ANALYZED: FEBRUARY 7, 1992 <br /> ANALYSES PREP/ANALYSIS LCS SPIKE DUPLICATE <br /> METHOD % RECOVERY %RECOVERY RPD <br /> TPH 3550/DHS EXT 86% 92% 1� <br /> r <br /> r <br /> LISA MACCLELLAN <br /> QA/QC DIRECTOR <br /> ' QIALITY CONTROL TERMINOLOGY <br /> •LCS - LABORATORY CONTROL STANDARD REPORTED AS % RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL <br /> SAMPLE PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTALBE RANGE IS 80%-120% RECOVERY. <br /> •SPIKE - ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND % RECOVERY OF CONCENTRATION SPIKED <br /> INTO SAMPLE IS CALCULATED. REPORTED AS % RECOVERY ACCEPTABLE RANGE FOR "NORMAL MATRIX SAMPLE" IS 75%-125% <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 />