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' 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> nf;eraghty & Miller, Inc Client Project ID Chevron #9-4275 <br /> 050 Manna Way South Matrix Solid <br /> Richmond, CA 94804 <br /> ttention Cynthia Hilton QC Sample Group 6111101-124 Reported Dec 12, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP112396 SP112396 SP112396 SP112396 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8024 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> M S/MSD# 5110706 6110706 6110706 6110706 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 11/23/96 11/23/96 11/23/96 11/23/96 <br /> Analyzed Date 11/23/96 11/23/96 11/23/96 11/23/96 <br /> strument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> ' Result 030 034 032 091 <br /> MS % Recovery 75 85 80 76 <br /> aDup Result 030 034 032 093 <br /> SD % Recov 75 85 So 78 <br /> ' RPD 00 00 00 22 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 5LCS112396 5LCS112396 5LCS112396 5LCS112396 <br /> Prepared Date 11/23/96 11/23/96 11/23/96 11/23/96 <br /> Analyzed Date 11/23/96 11/23/96 11/23/96 11/23/96 <br /> Instrument I D # HP-5 HP 5 HP-5 HP-5 <br /> ' Conc Spiked 20 Mg/L 20 pg/L 20 ug/L 60 ug/L <br /> LCS Result 19 21 20 58 <br /> LCS % Recov 95 105 100 97 <br /> LCS 60-140 60-140 60-140 60-140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> �UOIAANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer **MS=Matrix Spike MSD=MS Duplicate RPD=Relative% Difference <br /> ,Client Services Representative <br /> 6111101 GER <5> <br />