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Sequoia 680 Chesapeake Dnvc 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 /> Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /970610-Z2 <br /> 1680 Rogers Avenue Matrix Liquid v <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9706585 -01, 03-06 Reported Jun 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch#: GCO61497BTEX06A GCO61497BTEXoBA GCO61497BTEX06A GCO61497BTEX06A GC061497BTEX06A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Heider J Heider J Heider J Heider J Heider <br /> MS/MSD# 970664609 970664609 970664609 970664609 970664609 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Analyzed Date: 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Instrument I.D #: GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked: 10pg/L 10ug/L 10pg/L 30pg/L 6Dug/L <br /> Result: 11 99 10 31 77 <br /> % Recovery 110 99 100 103 128 <br /> Dup. Result 11 10 11 32 77 <br /> MSD % Recov • 110 100 110 107 128 <br /> RPD. 00 10 95 32 00 <br /> RPD Limit- 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK061497 BLK061497 BLK061497 BLK061497 BLK061497 <br /> Prepared Date 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Analyzed Date` 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Instrument I D #. GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked lopg/L 10yg/L 10Ng/L 30pg/L 60Ng/L <br /> LCS Result- 99 10 10 31 69 <br /> LCS % Recov - 99 100 100 103 115 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> 0 Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> Peggy Penner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9705585 BLA <1> <br />