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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 /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />• <br /> Touchstone Developments Client Project ID Chevron 9-8264 / 8264 <br /> 17170 Keaton Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order # 9602707 01, 02 Reported Feb 16, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21396BTEXEXA GCO21396BTEXEXA GCO21396BTEXEXA GCO21396BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD # 960245702 960245702 960245702 960245702 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 020 020 020 060 <br /> S % Recovery 100 100 100 100 <br /> Dup Result 020 020 020 060 <br /> MSD % Recov 100 100 100 100 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK121895 8LK121895 BLK121895 BLK121895 <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 021 022 022 066 <br /> LCS % Recov 105 110 110 110 <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 <br /> Please Note <br /> The LCS Is a control sample of known, interferent-free matrix that Is analyzed using the same reagents, <br /> OEGUOIA 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 /> Nr W-V 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 /> Kevin Follett <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9602707 TTT <3> <br />