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QUALITY ASSURANCE LABORATORY <br /> QUALITY CONTROL DATA REPORT <br /> NOVEMBER 20, 1991 <br /> ' TREATEK INC. <br /> LOG #16906-91 THROUGH 16908-91 <br /> ' DATE EXTRACTED: NOVEMBER 7, 1991- TPH <br /> NOVEMBER 8, 1991- LEAD <br /> DATE ANALYZED: NOVEMBER 7, 1991- TPH <br /> ' NOVEMBER 12 , 1991- LEAD <br /> ' ANALYSES <br /> METHOD LCS SPIKE DUPLICATE <br /> ' % RECOVERY %RECOVERY RPD <br /> TPH DHS EXT 101% 111$ 0% <br /> LEAD 6010 94% 62%* 3% <br /> * SPIKE RECOVERY OUT OF RANGE DUE TO SAMPLE MATRIX EFFECT. <br /> 1161A/,1 <br /> v- A <br /> QA/QC DIRECTOR <br /> QUALITY CONTROL TERMINOLOGY <br /> PLCS—LABORATORY CONTROL STANDARD REPORTED AS%RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL SAMPLE <br /> PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTABLE RANGE 15 80%.-12D%RECOVERY <br /> OSPIKE—ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND%e RECOVERY OF CONCENTRATION SPIKED INTO <br />' SAMPLE IS 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 ANALYS'7;METHOD <br />