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1 Redwood Ci CA 94063 650 364-%00 FAX(650)364-9233 <br /> 680 Chesapeake Drive City { ) <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX{916}92l-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 Ripon Unified School <br /> 1260 Graphics Drive <br />' Modesto, CA 95351-1502 QC Sample Group 9809E49-02 Reported orted Oct 9, 1998 <br /> Attention Drew Van Allen <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> ' Analyst GR <br /> ANALYTE Gasoline <br /> ' QC Batch# GC092998BTEX30A <br /> Sample No GW9809F07-2 <br /> ' Date Prepared 9129198 <br /> Date Analyzed 9129198 <br /> Instrument I D# GCHP30 <br /> ' Sample Cone , uglL N D <br /> Cone Spiked, ug/L 250 <br /> Matrix Spoke ug/L 260 <br /> % Recovery 102 <br /> Matrix <br /> Spike Duplicate, ug1L 260 <br /> ' % Recovery 103 <br /> Relative % Difference 098 <br /> ' RPD Control Limits 0-25 <br /> ' LCS Batch# GWLCS092998A <br /> Date Prepared 9129198 <br /> Date Analyzed 9129198 <br /> ' Instrument i D # GCHP30 <br /> Cone Spiked ug/L 250 <br /> ' LCS Recovery, ug/L 250 <br /> LCS % Recovery 102 <br /> ' Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCs 70-130 <br /> Quality Assurance Statement AIV standard operating procedures and quality control requirements have been met <br /> ' Please 1Vote <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 /> n <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 /> 7 interference the LCS recovery is to be used to validate the hatch <br /> Kay Cimyai <br /> ' Project Manag r <br />