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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical a19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> NCO <br /> Blaine Tech Servif,es Client Project ID Chevron 9-82641980609-J1 <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Fran Thie QC Sample Group 9806003-01 Reported Jun 24 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/8020, 6011602 <br /> Analyst B All <br /> T ANALYTE 1 1-DCE TCE Chlorobenzene Benzene Toluene Chlorcbenzene <br /> QC Batch # GC0620980VOA24A <br /> Sample No 9806519-01 <br /> Date Prepared 6/20/98 6120/98 6/20198 6/20/98 6/20/98 6120/98 <br /> Date Analyzed 6/20198 6/20/98 6120198 6120/98 6/20/98 6120/98 <br /> Instrument I D # GCHP24_2 GCHP24_2 GCHP24_2 GCHP24_2 GCHP24_2 GCHP24_2 <br /> Sample Cone ug/L N D N D N D N D N D N D <br /> Cone Spiked ug/L 25 25 25 25 25 25 <br /> Matrix Spike ug/L 27 26 29 24 23 22 <br /> % Recovery 108 104 116 96 92 88 <br />• Matrix <br /> Spike Duplicate ug/L 30 26 29 2b 24 23 <br /> % Recovery 120 104 116 100 96 92 <br /> Relative % Difference 11 0 0 0 0 4 1 4 3 4 4 <br /> RPD Control Limits 0 50 0-50 0-50 0 50 0-50 0 50 <br /> LCS Batch# VWBLK0620986SA <br /> Date Prepared 6120/98 6120198 6120/98 6/20/98 6/20/98 6/20/98 <br /> Date Analyzed 6120198 6/20198 6/20/98 6/20198 6/20/98 6120198 <br /> Instrument I D # GCHP24_2 GCHP24_2 GCHP24_2 GCHP24_2 GCHP24_2 GCHP24 2 <br /> Cone Spiked, ug/L 25 25 25 25 25 25 <br /> Recovery ug/L 29 25 30 25 24 23 <br /> LCS % Recovery 116 100 120 100 96 92 <br /> Percent Recovery Control Limits <br /> MS/MSD 65 135 70130 70130 70130 70130 70130 <br /> LCS 65 135 70130 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is aralyzed us:ng the same reagents <br /> SEQUOIALYTICAL 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 It <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> l interference the LCS recovery is to be used to validate the batch <br /> / 0ect <br /> gory <br /> f ranager <br /> ,mak <br />