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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)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)79,Z-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project 1D Ripon Unified School <br /> 1260 Graphics Drive <br /> ' Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9809E49-03,05 Reported Oct 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ' Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst N C <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch # GCO92998BTEX03A <br /> Sample No GW9809943-2 <br /> Date Prepared 912919B 9129198 9129198 9129198 <br /> ' Date Analyzed 9129/98 9129198 9129198 9129198 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc , uglL N D N D N D N D <br /> ' Conc Spiked, uglL 10 10 10 30 <br /> Matrix Spike, uglL 9 5 94 96 29 <br /> % Recovery 95 94 96 97 <br /> Matrix 27 <br /> Spike Duplicate, uglL 8 9 8 7 8 8 <br /> % Recovery 89 87 88 90 <br /> 1 <br /> Relative % Difference 6 5 77 8 7 7 5 <br /> ' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GWLCS092998A <br /> Date Prepared 9129198 9129198 9129198 9129198 <br /> Date Analyzed 9129198 9129198 9129198 9129198 <br /> ' Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, uglL 10 10 11 32 <br /> LCS % Recovery 100 100 110 107 <br /> Percent Recovery Control Limits <br /> MS1M$D 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 matnx 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 /> Kayv imyai <br /> ' Pr ct Manager <br />