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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 (514) 988 9600 FAX (510)988 9673 <br /> 11co Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WILIChstone Developments Client Project ID Chevron #9-4183 <br /> 781 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory OC Sample Group 6841944-948 Reported May 6, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Acenaphthene 4-Nitrophenol 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# SP042996 SP042996 SP042996 SP042996 SP042996 <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 T Grantcher T Granlcher T Granicher T Granlcher T Granlcher <br /> MS/MSD # 6041872 6041872 6041872 6041872 6041872 <br /> Sample Conc N D N D N D N D ND <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Conc Spiked 2500ug/kg 5000 ug/kg 2500ug/kg 5000ug/k9 2500ug/kg <br /> Result 2900 2100 1300 4800 3400 <br /> MS % Recovery 116 42 50 95 136 <br /> D u p Result 3200 2100 1600 5900 4000 <br /> OMSD % Recov 128 42 64 118 160 <br /> RPD 98 00 25 22 16 <br /> RPD Limit 0-19 0-50 0-47 0-47 0-36 <br /> LCS# LCS050196 LCS050196 LCS050196 L-CS050196 LCS050196 <br /> Prepared Date 5/1/96 5/1/96 5/1/96 5/1/96 5/1/96 <br /> Analyzed Date 5/2/96 5/2/96 5/2/96 5/2/96 5/2/96 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/IVIS-1 GC/MS-1 <br /> Conc Spiked 2500ug/kg 5000yg/kg 2500 ug/kg 5000 ug/kg 2500ug/kg <br /> LCS Result 2300 3300 1800 3500 2500 <br /> LCS % Recov 92 66 70 70 98 <br /> LCS 50-140 20-120 20-120 30-110 50.115 <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 /> iLA ANALYTICAL, #1271 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> J the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> L— 1y./ Interference,the LCS recoveryis to be used to validate the batch <br /> ` **MS=Matnx Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Kevin Van Slambrook <br /> Project Manager Page 2 of 2 <br /> 6041944 TUD <14> <br />