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o <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 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 /> ATC Associates Inc Client Project ID Westrec Prop /Kir 62514 0001 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9812C87-05-06 Reported Dec 31, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC122898BTEX30A <br /> Sample No GW9812A04-2 <br /> Date Prepared 12/28/98 12/28/98 12/28/98 12/28/98 <br /> Date Analyzed 12/28/38 12/28/98 12/28198 12/28/98 <br /> Instrument I D # GCHP,30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone uglL N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike ug/L 11 11 10 30 <br /> % Recovery 110 110 100 100 <br /> Matrix <br /> Spike Duplicate uglL 11 11 10 31 <br /> % Recovery 110 110 100 103 <br /> Relative % Difference 0 0 0 0 0 0 3 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC1228986TEX30A <br /> Date Prepared 12/28/98 12/28/98 12128/98 12/28/98 <br /> Date Analyzed 12/28198 12/28/98 12/28/98 12/28/98 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked ug1L 10 10 10 30 <br /> LCS Recovery ug/L 11 11 11 32 <br /> LCS % Recovery 110 110 110 107 <br /> Percent Recovery Control Limits <br /> F- <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 sampte <br /> • l fortified with known quantities of specific compounds and subjected to the entire analytscal 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 hatch <br /> Kayv imya <br /> P ect Manager <br />