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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(S10)988 9673 <br /> X1,7 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> UChstone Developments Client Project ID Chevron #9-4183 <br /> 1 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory OC Sample Group 6041871-874 Reported Apr 30, 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 Granicher T Granicher T Granlcher T Granicher T Granicher <br /> MS/MSD # 6041872 6041872 6041872 6041872 6041872 <br /> Sample Conc NO N D N D N D N D <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Conc Spiked 2500 ug/kg 5000 ug/kg 2500 ug/kg 5000ug/kg 2500f.tg/kg <br /> Result 2900 2100 1200 4800 3400 <br /> MS % Recovery 116 42 48 95 136 <br /> Dup Result 3200 2100 1600 5900 4000 <br /> orSD % Recov 12B 42 64 118 160 <br /> RPD 98 00 29 22 16 <br /> RPD Limit 0-19 0-50 0-47 0-47 0-36 <br /> LCS # LCSO42996 LCSO42996 LCSO42996 LCSO42996 LCSO42996 <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Conc Spiked 2500 ug/kg 5000 ug/kg 2500 ug/kg 5000ug/kg 2500ug/kg <br /> LCS Result 1900 2900 1300 3100 1900 <br /> LCS % Recov 74 58 52 62 76 <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 /> SEQUOIA ANALYTICAL, #1271 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 9 / the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> n �,`°�"/� interference,the LCS recoveryis to be used to validate the batch 6L <br /> **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Kevin Van Slam rook <br /> Project Manager Page 2 of 2 <br /> 6041871 TUD <24> <br />