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QUALITY CONTROL REPORT, CONTINUED OCTOBER 1, 1992 TREATEK SAMPLE LOG #16124-92I THROUGH 16128-92I ' DATE EXTRACTED: SEPTEMBER 28 , 1992 DATE ANALYZED: SEPTEMBER 28, 1992 EXTRACTION METHOD: 5030 ANALYSIS METHOD: 8020 Concentrations were calculated using a 4 point curve of ' concentrations 2 . 5 , 5, 10 and 20 ppb. LABORATORY CONTROL STANDARD A 20 ppb standard verification was run in the sample set up. ' METHOD BLANK NO TARGET ANALYTES WERE DETECTED IN METHOD BLANK. ' LCS COMPOUND %RECOVERY ' Benzene 84% Toluene 82% Ethylbenzene 86% Xylenes 85% SPIKE DATA A QAL Method Blank was spiked in duplicate with 20 ppb 8020 standard. ' COMPOUND SPIKE RELATIVE % RECOVERY % DIFFERENCE ' Benzene 85% 3% Toluene 83% 0% ' Ethylbenzene 87% 0% Xylenes 86% 0% I y X/IL 1M ' YVETTE J. LIEBESMAN QA SPECIALIST I QUALITY CONTROL TERMINOLOGY •LCS - LABORATORY CONTROL STANDARD REPORTED AS % RECOVERY OF AN INDEPENDENT STANDARD CARRIED THROUGH ALL SAMPLE PREPARATION PROCEDURES TO VERIFY METHOD PERFORMANCE ACCEPTABLE RANGE IS BASED ON HISTORICAL LABORATORY CONTROL DATA, BUT IS GENERALLY WITHIN A 80%-120% RECOVERY RANGE. ' •SPIKE - ENVIRONMENTAL SAMPLE IS MATRIX SPIKED WITH METHOD COMPOUNDS AND % RECOVERY OF CONCENTRATION SPIKED INTO SAMPLE IS CALCULATED REPORTED AS % RECOVERY ACCEPTABLE RANGE FOR "NORMAL MATRIX SAMPLE" IS BASED ON HISTORCCAL LABORATORY CONTROL DATA, BUT IS GENERALLY WITHIN A 75%-125% RECOVERY RANGE. •SURROGATES - COMPOUNDS REPRESENTATIVE OF A GROUP OF COMPOUNDS SURROGATES ARE SPIKED INTO ENVIRONMENTAL ' SAMPLES AND % RECOVERY OF CONCENTRATION SPIKED IS CALCULATED AND REPORTED. ACCEPTABLE RANGE VARIES DEPENDING ON SAMPLE MATRIX AND ANALYSIS METHOD.