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� 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical <br /> 819 Striker Avenue Suite$ Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)791-0342 <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 9812C87-01-04 Reported Dec 31 i 998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst SH <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC122898BTEX06A <br /> Sample No GW9812C87-1 <br /> Date Prepared 12/28/98 12/28/98 12/28/98 12/28/98 <br /> Date Analyzed 12/28/98 12/28/98 12/28/98 12/28/98 <br /> Instrument I D # GCHP06 GCHP06 GCHP06 GCHP06 <br /> Sample Conc ug1L N D N D N D N D <br /> Conc Spiked ug1L 10 10 10 30 <br /> Matrix Spike uglL 8 9 8 2 8 3 24 <br /> % Recovery 89 82 83 80 <br /> Matrix <br /> Spike Duplicate uglL 10 9 5 9 6 28 <br /> Recovery 100 95 96 93 <br /> Relative % Difference 12 15 15 15 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC122898BTEX06A <br /> Date Prepared 12128/98 12/28/98 12/28/98 12/28198 <br /> Date Analyzed 12/28/98 12/28/98 12/28/98 12/28/98 <br /> Instrument I D # GCHP06 GCHP06 GCHP06 GCHP06 <br /> Conc Spiked uglL 10 10 10 30 <br /> LCS Recovery uglL 10 9 2 9 3 27 <br /> LCS % Recovery 100 92 93 90 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 60140 60 140 60140 60 140 <br /> LCS 70130 70 130 70 130 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 usmg 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 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 batch <br /> Kayva yai <br /> Pro Managed <br />