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Sequoia 680 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 /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Development Client Project ID <br /> ! Chevron #9-2033 <br /> P O Box 2554 <br /> Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090634-655 Reported Sep 24, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Fuel Oil & <br /> Fingerprint Grease <br /> QC Batch# SP091696 SP091796 <br /> 8015EXA 552OMDA <br /> Analy Method EPA 8015 SM 5520 <br /> Prep Method EPA 3550 SM 5520 <br /> Ana yst ! Dalvand D Newcomb <br /> M S/MSD # 6090652 6090653 <br /> Sample Cone 530 mg/kg N D <br /> Prepared Date 9/16/96 9/17/96 <br /> Analyzed Date 9/16/96 9/17/96 <br /> Instrument I D # HP-3A Manual <br /> Cone Spiked 10 mg/kg 5000 mg/kg <br /> Result 290 4600 <br /> MS % Recovery - 92 <br /> Dup Result 310 4400 <br /> D % Recov 88 <br /> RPD - 44 <br /> RPD Limit 0-50 0-30 <br /> LCS # LCS091696 BLK091796 <br /> Prepared Date 9/16/96 9/17/96 <br /> Analyzed Date 9/16/96 9/17/96 <br /> Instrument I D # HP-3A Manual <br /> Cone Spiked 10 mg/kg 5000 mg/kg <br /> LCS Result 12 4500 <br /> LCS % Recov 120 90 <br /> LCS 50 150 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, #7271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> n fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> (� the 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 /> MEIISSa A Brewer **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative�Difference <br /> Client Services Representative <br /> 6090634 TOU <12> <br />