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1 <br /> QUALITY ASSURANCE LABORATORY <br /> QUALITY CONTROL DATA REPORT <br /> NOVEMBER 14, 1991 <br /> ' TREATEK <br /> LOG #16576-91 THROUGH 16578-91 <br /> ' DATE EXTRACTED: NOVEMBER 1, 1991 - TPH <br /> NOVEMBER 4 , 1991 - LEAD <br /> DATE ANALYZED: NOVEMBER 1, 1991 - TPH <br /> NOVEMBER 7, 1991 - LEAD <br /> ' ANALYSES METHOD LCS SPIKE DUPLICATE <br /> % RECOVERY %RECOVERY RPD <br /> TPH DHS EXT 94% 87% 11% <br /> LEAD 6010 94% 114% 14% <br /> LI A L <br /> QA/QC DIRECTOR <br /> OUALf1Y 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 IS CALCULATED REPORTED AS%RECOVERY ACCEPTABLE RANGE FOR"NORMAL MATRIX SAMPLE-IS 75%-725%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 />