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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> r , . 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)9ZI-0100 <br /> IoAnalytical 1455 McDowell Blvd North Ste D Petaluma, CA 94954 (707)792 1665 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-82641980810-T1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 98018910-01 Reported Aug 31, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 80/0/8020 60 i 1602 <br /> Analyst B AL1 <br /> ANALYTE 1 1 DCE TCE Chlorobenzene Benzene Toluene Chlorobenzene <br /> QC Batch # GCO822980VOA29A <br /> Sample No 9808728-04 <br /> Date Prepared 8121198 8/21198 8/21J98 8121198 8121198 8121198 <br /> Date Analyzed 8121198 8121198 8/21198 8121198 8121198 8r21198 <br /> Instrument I D # GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 <br /> Sample Conc uglL N D 0 8 N D N D N D N D <br /> Conc Spiked uglL 25 25 25 25 25 25 <br /> Matrix Spike uglL 32 28 28 26 25 26 <br /> % Recovery 128 109 112 104 100 104 <br /> Matrix <br /> Spike Duplicate ug1L 36 34 34 27 26 28 <br /> % Recovery 144 133 136 108 104 112 <br /> Relative % Difference 12 20 19 3 8 3 9 7 4 <br /> RPD Control Limits 0 50 0 50 050 050 0 50 0 50 <br /> LCS Batch# VWLCS082298A <br /> Date Prepared 8122198 8122198 8122198 8122198 8122198 8!22/98 <br /> Date Analyzed 8!22!98 8122198 8122198 8122198 8122198 8122198 <br /> Instrument I D # GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 <br /> Conc Spiked ug/L 25 25 25 25 25 25 <br /> Recovery uglL 26 27 29 23 23 26 <br /> LCS % Recovery 104 108 116 92 92 104 <br /> Percent Recovery Control Limits <br /> F- <br /> M51VISO 60 140 60 140 60140 60140 60 140 60 140 <br /> LCS 65 135 70130 70130 70 130 70130 70 130 <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 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 anaiytes 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 /> anager <br />