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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N W�get 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 /> Qouchstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 7030207 Reported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Acenaphthene 4 Nctrophenol 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> CC Batch# SP030797 SP030797 SP030797 SP030797 SP030797 <br /> 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst I Dalvand I Dalvand I Dalvand I Dalvand I Dalvand <br /> MS/MSD # 7030207 7030207 7030207 7030207 7030207 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 <br /> Instrument I D # GC/MS 1 GC/MS-1 GC/MS-1 GC/MS 1 GC/MS 1 <br /> Conc Spiked 2500 jug/kg 5000pg/kg 2500 pg/kg 5000 erg/kg 2500 pg/kg <br /> Result 1600 2900 1700 2800 2000 <br /> MS % Recovery 62 57 68 55 80 <br /> Dup Result 2300 3700 2300 3700 2900 <br /> MSD % Recov 90 73 92 73 114 <br /> RPD 37 25 30 28 35 <br /> RPD Limit 0-40 040 040 0-40 040 <br /> LCS # LCS030797 LCS030797 LCS030797 LCS030797 LCS030797 <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 <br /> Instrument I D # GC/MS-1 GC/MS 1 GC/MS-1 GC/MS 1 GC/MS 1 <br /> Conc Spiked 2500 jig/kg 5000,ug/kg 2500 Mg/kg 5000 pg/kg 2500 pg/kg <br /> LCS Result 2100 3900 2000 3900 2300 <br /> LCS % Recov 82 77 80 77 92 <br /> LCS 31-137 11 114 28-89 17-109 35-142 <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 /> preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> SEQUOIA ANALYTICAL, #1271 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> Qthe 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 /> **MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference <br /> Melissa A Brewer <br /> Client Services Representative Page 2 of 2 <br /> 7030207 TOU <12> <br />