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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 hf Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> Analytical 119 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916921-0100 <br /> North McDowell Blvd orth Ste D Petaluma,CA 94954 707 792-1865 FAX(707)79Z-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-20331980811-P1 <br /> 1680 Rogers Avenue <br /> San Jose CA 96112 <br /> Attention Fran Thle QC Sample Group 9808956 01 Reported Aug 28 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> O.0 Batch # GC0824980HBPEXZ <br /> Sample No 9808957-2 <br /> Date Prepared 8124198 <br /> Date Analyzed 8127198 <br /> Instrument I D # GCHPSB <br /> Sample Cone ug/L 6900 <br /> Cone Spiked ug1L 1000 <br /> Matrix Spike ug/L 7700 <br /> % Recovery 80 <br /> Matrix <br /> Spike Duplicate ug/L 7800 <br /> % Recovery 90 <br /> Relative % Difference 12 <br /> RPD Control Limits 050 <br /> LCS Batch# BLK082498ZS <br /> Date Prepared 8124198 <br /> Date Analyzed 8127198 <br /> Instrument 1 D # GCHP4A <br /> Cone Spiked ug1L 1000 <br /> Recovery ug1L 740 <br /> LCS % Recovery 74 <br /> Percent Recovery Control Limits <br /> MSlMSO 50 150 <br /> LCS 60 140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a controk sample of known interferent free matrix that is analyzed using the same reagents <br /> SEGLI YTICAL 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 analyticai procedure 4f <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 /> Ory <br /> -Proj Manager <br />