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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 ( 10) 364 9600 FAX(650)364 9133 <br /> 404 N Wiget Lane Walnut Geek CA 94598 (1510) 988 9600 FAX(510) 986 9573 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95534 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264/980609-J1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9806003-01 Reported Jun 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 2,4-Dmitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# MS0611988270EXB MS0611988270EXB MS0611988270EXB <br /> Anally Method EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3510 EPA 3510 EPA 3510 <br /> Analyst E Manuel E Manuel E Manuel <br /> MS/MSD # BLK051198 BLK061198 BLK061198 <br /> Sample Conc N D N D N D <br /> Prepared Date 6/11/98 6/11/98 6/11/98 <br /> Analyzed Date 6/12/98 6/12/98 6/12/98 <br /> Instrument I D # F4 F4 F4 <br /> Conc Spiked 200 Yg/L 200 Ng/L 200 pg/L <br /> Result 112 53 162 <br /> MS % Recovery 56 27 81 <br /> Dup Result 133 59 187 <br /> MSD % Recov 67 35 94 <br /> RPD 17 25 14 <br /> RPD Limit 0-30 0-30 0-30 <br /> LCS# LCS061298 LCS061298 LCS061298 <br /> Prepared Date 6/12/98 6/12/98 6/12/98 <br /> Analyzed Date 6/12/98 6/12/98 6/12/98 <br /> Instrument I D # H5 H5 H5 <br /> Conc Spiked 200 ug/L 200 pg/L 200 pg/L <br /> LCs Result 136 144 170 <br /> LCS % Recov 68 72 85 <br /> LCS <br /> Control Limits 24-96 9-103 26-127 <br /> Please Note <br /> The LCS is a control sample of known, interferent-free matrix that is analyzed using the same reagents,7 <br /> 0 SEQUOIA AN LYTICAL 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 recovery is to be used to validate the batch <br /> gory **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> ct Manager Page 3 of 3 9806003 BLA <4> <br />