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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 /> Ili Analytical $19 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ouchstone Developments Client Project ID Chevron #9-4183 <br /> 781 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory OC Sample Group 6041944-948 Reported May 6, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Diesel Oil& <br /> Benzene Grease <br /> QC Batch# SP050196 SP050196 SP050196 SP050196 SP042996 SP050196 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8015EXA 5520MDA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 SM 5520 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3550 SM 5520 <br /> Analyst L Huang L Huang L Huang L Huang J Dinsay D Newcomb <br /> MS/MSD # 6041572 6041572 6041572 6041572 6041763 6041944 <br /> Sample Conc N D N D N D ND N D N D <br /> Prepared Date 5/1/96 5/1/96 5/f/96 5/1/96 4/29/96 5/1/96 <br /> Analyzed Date 5/1/96 5/1/96 5/1/96 5/1/96 4/29/96 5/1/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 HP-3A Manual <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 10 mg/kg 5000 mg/kg <br /> Result 033 036 035 11 10 5000 <br /> MS % Recovery 83 90 88 92 100 100 <br /> Dup Result 037 039 037 12 91 4400 <br /> WSD % Recov 93 98 93 100 91 88 <br /> RPD 11 80 56 87 94 13 <br /> RPD Limit 0-50 0-50 0-50 0-50 0-50 0-30 <br /> LCS # 4LCS050196 4LCS050196 4LCS050196 4LCS050196 LCSO42996 BLK050196 <br /> Prepared Date 5/1/96 5/1/96 5/1/96 5/1/96 4/29/96 5/1/96 <br /> Analyzed Date 5/1/96 5/1/96 5/1/96 5/1/96 4/29/96 5/1/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 HP-3A Manual <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L 10 mg/kg 5000 mg/kg <br /> LCS Result 17 18 18 54 87 5000 <br /> LCS % Recov 85 90 90 90 87 100 <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 50-150 60-140 <br /> 1 <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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Kevin Van Slambrook **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager <br /> 6041944 T U D <11> <br /> .sem. <br />