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2 <br /> 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Sequoia <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X117Analytical 819 Sinker Avenue,Suitt 8 Sacramento CA 95834 (916) 92t 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970610-Z4 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9706578 -01-03 Reported Jun 24, 1997, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO61697BTEX18A GC061697BTEX18A GCO61697BTEX19A GCO61697BTEX18A GCO61697BTEX18A <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' A.Porter A Porter A.Porter A. Porter A Porter <br /> MS/MSD#- 970658503 970658503 970658503 970658503 970658503 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date. 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D #: GCHP18 GCHP18 GCHP18 GCHPIB GCHP18 <br /> Cone Spiked- 10ug/L 10Ng/L 10ug/L 30,ug/L 60ug/L <br /> Result 7 7 8 9 9 5 29 57 <br /> 0% Recovery 77 89 95 97 95 <br /> Dup Result: 7 5 8 8 9 5 30 56 <br /> MSD % Recov. 75 88 95 100 93 <br /> RPD. 26 11 00 34 18 <br /> RPD Limit. 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK061697 BLK061697 BLK061697 BLK061697 BLK061697 <br /> Prepared Date: 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date: 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D# GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone. Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 60 ug/L <br /> LCS Result: 79 92 10 30 58 <br /> LCS %Recov.: 79 92 100 100 97 <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 /> • 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 enner /� L <br /> Protect Manager' **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9706578 BLA <I> <br />