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I <br /> 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 Client Project ID 96-163, Knowles Roek <br /> 1714 Main St <br /> ' Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 9811 F62-01 Reported Dec 3, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch # GC1 12598BTEX03A <br /> Sample No GW9811 F58-3 <br /> Date Prepared 11125/98 11/25/99 11/25/9B 11/25/98 <br /> ' Date Analyzed 11125/98 11/25/98 11/25198 11/25/98 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone , ug1L N D N D N D N D <br /> ' Cone Spiked, ug1L 10 10 10 30 <br /> Matrix Spike ug1L 10 10 11 32 <br /> Recovery 100 100 110 107 <br /> Matrix <br /> Spike Duplicate, ug1L 10 11 11 33 <br /> Recovery 100 110 110 110 <br /> 1 <br /> Relative % Difference 00 9 5 0 0 2 8 <br /> ' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GC112598BTEX03A <br /> Date 'reparea 11125!9"o 11 i25198 11/25/98 1 1/25198 <br /> Date Analyzed 11/25/98 11/25/98 11/25/98 11/25/98 <br /> ' Instrument 1 D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 8 6 8 8 9 1 27 <br /> LCS % Recovery 86 88 91 90 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 <br /> F— 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 /> �1 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> /. r . f -� „, „ Q, � the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> r/U risks �1�!/C1yL'"� interference the LCS recovery is to be used to validate the batch <br /> Mara Gnshs <br /> Project Manager <br />