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K 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 /> %ice Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 191OUChstone Developments Client Project ID Chevron #9-4183 <br /> 781 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory QC Sample Group 6041944-948 Reported May 6, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-D;chloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> QC Batch# GCO50196 GCO50196 GCO50196 <br /> 801007A 801007A 801007A <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst I Dalvand I Dalvand I Dalvand <br /> MS/MSD # 6041944 6041944 6041944 <br /> Sample Cone N D N D N D <br /> Prepared Date 5/1/96 5/1/96 5/1/96 <br /> Analyzed Date 5/1/96 5/1/96 5/1/96 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Conc Spiked 100jug/kg 100jug/kg 100{tg/kg <br /> Result 60 48 72 <br /> MS % Recovery 60 48 72 <br /> Dup Result 51 47 71 <br /> 0 1 <br /> MSD % Recov 51 47 71 <br /> RPD 16 21 1 4 <br /> RPD Limit 0-30 0-30 0-30 <br /> LCS # LCS050196 LCS050196 LCS050196 <br /> Prepared Date 5/1/96 5/1/96 5/1/96 <br /> Analyzed Date 5/1/96 5/1/96 5/1/96 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Cone Spiked 100pg/kg 100 mg/kg 100jug/kg - <br /> LCS Result 69 87 84 <br /> LCS % Recov 69 87 84 <br /> LCS 28-167 35-146 38-150 <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 /> 11 f� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> I interference,the LCS recovery is to beed s t o validate the batch <br /> u <br /> Kevin Van Slambrook **MS=Matrix Spike,M D=MS Duplicate, RPO=Relative% Difference <br /> Project Manager <br /> 6041944 TUD <12> <br /> .mak <br />