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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(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 931 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton / 961025-H1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 961 OH37 -01-02 Reported Nov 14, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC103096BTEX07A GC103096BTEX07A GC103096BTEX07A GC103096BTEX07A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst H Porter H Porter H Porter H Porter <br /> MS/MSD # 961OB9104 961OB9104 961089104 961OB9104 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Analyzed Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument 1 D # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10 Ng/L 10 erg/L 10 yg/L 30Ng/L <br /> Result 99 99 10 30 <br /> MS % Recovery 99 99 100 100 <br /> Dup Result 98 97 98 29 <br /> MSD % Recov 98 97 98 97 <br /> RPD 10 20 20 34 <br /> RPD Limit 0-25 0-25 025 025 <br /> LCS # BLK103096 BLK103096 BLK103096 BLK103096 <br /> Prepared Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Analyzed Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10 pg/L 10 Ng/L 10 ug/L 30 Ng/L <br /> LCS Result 10 10 10 31 <br /> LCS % Recov 100 100 100 103 <br /> MS/MSD 60-140 60-140 60140 60-140 <br /> LCS 70130 70-130 70-130 7D-130 <br /> Control Limits <br /> ?lease Note <br /> The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> �E©UOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> le- <br /> interference the LCS recovery is to be used to validate the batch <br /> ner <br /> Project Manager ** MS=Matrix Spike MSD=MS Duplicate RPD=Relative%Difference 961OH37 BLA <1> <br />