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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 {916}921-9600 FAX{916}9Z1-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID W Properties/KIR, 62514 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 98091-147-01-04,06,07 Reported Oct 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst GR/MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC100198BTEX30A <br /> Sample No GW9809F39-6 <br /> Date Prepared 1011198 1011198 1011198 1011198 <br /> Date Analyzed 1011198 1011198 1011198 10111198 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cone Spiked ug1L 10 10 10 30 <br /> Matrix Spike ug/L 8 8 10 9 5 28 <br /> % Recovery 88 103 95 94 <br /> Matrix <br /> Spike Duplicate, ug/L 8 8 10 9 3 28 <br /> % Recovery 88 102 93 95 <br /> Relative % Difference 00 098 2 1 1 1 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS100198B <br /> Date Prepared 1011198 1011198 1011198 1011!98 <br /> Date Analyzed 1011198 1011198 1011198 1011198 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 2 93 9 5 28 <br /> LCS % Recovery 92 93 95 95 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60-140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quahty 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 rnterferent free matrix that is analyzed using the same reagents <br /> 0 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 /> K Omy <br /> rolect Ma ger <br />