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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> 15) Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (9t6) 921 9600 FAX (916) 921 0100 <br /> qkw <br /> 0ouchstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe OC Sample Group 7030207 Reported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel Oil& <br /> Grease <br /> QC Batch# SP030797 SP031097 <br /> 8015EXA 5520MDA <br /> Analy Method EPA 8015 SM 5520 <br /> Prep Method EPA 3550 SM 5520 <br /> Analyst D Sharma I Dalvand <br /> MS/MSD # 7030207 BLK031097 <br /> Sample Conc N D N D <br /> Prepared Date 3/7/97 3/10/97 <br /> Analyzed Date 3/7/97 3/10/97 <br /> Instrument I D # HP-3B Manual <br /> Conc Spiked 10 mg/kg 5000 mg/kg <br /> Result 80 4100 <br /> MS % Recovery 80 81 <br /> . Dup Result 76 4100 <br /> MSD % Recov 76 82 <br /> RPD 51 12 <br /> RPD Limit 0-50 0-30 <br /> LCS # LCS030797 LCS031097 <br /> Prepared Date 3/7/97 3/10/97 <br /> Analyzed Date 3/7/97 3/10/97 <br /> Instrument I D # HP 3A Manual <br /> Conc Spiked 10 mg/kg 5000 mg/kg <br /> LCS Result 82 4000 <br /> LCS % Recov 82 so <br /> LCS 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 /> SEQUOIA ANALYTICAL, #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 /> e 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 /> 7030207 TOU <9> <br />