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' 680 Chesapeake Dnve Redwood City CA 94063 650 364-9600 FAX(650)364-9233 <br /> Sequoia ( ) <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> x,17 <br /> Analytical 819 Sinker Avenue Suite 8 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)792-0342 <br /> ' ATC Associates Inc Client Project ID 62574 00031Sktn Five Station <br /> 1117 Lone Palm Avenue <br /> ' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 981 1 F27 03 Reported Dec 2 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 # GC11259813TEX03A <br /> Sample No GW981 1 F58-3 <br /> Date Prepared 11/25/98 11125198 11/25/98 11,125/98 <br /> ' Date Analyzed 11/25/98 11/25/98 11/25/98 11/25/98 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <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 10 10 11 32 <br /> -/. Recovery 100 100 110 107 <br /> Matrix <br /> Spike Duplicate ug/L 10 11 11 33 <br />' % Recovery 100 110 110 110 <br /> Relative % Difference 0 0 9 5 00 2 8 <br /> 1 RPD Control Limits 0-25 0-25 0-25 0-25 <br />' LCS Batch# GC 1 125988TEX03A <br /> Date Prepared 11/25/98 11/25198 17125/98 11/25/98 <br /> Date Analyzed 11/25/98 11125/98 11/25/98 11/25/98 <br />' Instrument I 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 60 140 60140 60 140 <br /> ICS 70130 70 130 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 /> �EQUOIA 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 recover is to be used to validate the batch <br /> Kayv myai <br /> 5ject Man r <br /> 1 <br />