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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 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)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ground Zero Analysts, Inc Client Project ID 96-163 Knowles Rock <br /> 1714 Mala Street <br /> 1 Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 9901867-02 Reported Feb 1 1999 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO12199BTEX30A <br /> Sample No GW9901573-03 <br /> Date Prepared 1121199 1/21/99 1121199 1121199 <br /> ' Date Analyzed 1121/99 1121199 1121199 1121199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone ug/L N D N D N D N D <br /> ' Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 9 1 94 9 4 28 <br /> Recovery 91 94 94 94 <br /> Matrix <br /> Spike Duplicate, ug/L 92 9 5 9 5 28 <br /> 1 °k Recovery 92 95 95 95 <br /> Relative % Difference 1 1 1 1 1 1 1 1 <br /> RPD Control Limits 0-25 0-25 026 0-25 <br /> LCS Batch# GCO12199BTEX30A <br /> Date Prepared 1/21/99 1/21/99 1121199 1121199 <br /> Date Analyzed 1/21/99 1121199 1121199 1121199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked ug/L 10 10 10 30 <br /> ' LCS Recovery ug1L 8 5 84 8 2 25 <br /> LCS % Recovery 85 84 82 83 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 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 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 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 /> Mara Gnshs <br /> Protect Manager <br />