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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 404 N Wiget Lane <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 Ripon Unified School <br /> 1260 Graphics Drive <br />' Modesto, CA 95351-1502 QC Sample Group 9809E49-01,04 Reported Oct 9, 1998 <br /> Attention Drew Van Allen <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst GRIMM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch # GCO92598BTEX21 A <br /> Sample No GW9809641-11 <br /> Date Prepared 9125198 9125198 9125198 9125198 <br /> ' Date Analyzed 9125198 9125198 9125198 9125198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug1L 11 11 11 33 <br /> % Recovery 113 112 110 111 <br /> Matrix 11 32 <br /> Spike Duplicate, ug/L 11 11 <br /> % Recovery 107 107 106 108 <br /> Relative % Difference 5 5 46 <br /> 37 27 <br /> ' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GWLCS092598A <br /> Date Prepared 9125198 9125198 9125198 9!25198 <br /> Date Analyzed 9125198 9125198 9125198 9125198 <br /> ' Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> ' LCS Recovery, ug1L 11 11 11 33 <br /> LCS % Recovery 109 109 110 110 <br /> Percent Recovery Control Limits 60 140 <br /> MS/MSD 60-140 60140 6010.0 <br /> F�-�-� <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 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 /> Kay imyal <br /> ' Protect Manager <br />