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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wliget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95B34 (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 /> Blaine Tech Services Client Protect ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9810737-05-06 Reported Oct 27, 1998 <br /> QUALITY—CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC/GR <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC101598BTEX30A <br /> Sample No GW9810482-3 <br /> Date Prepared 10/15/98 10/15/98 _ 10/15/98 10/15/98 <br /> Date Analyzed 10/15/98 10/15/98 10/15/98 10/15/98 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <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, ug/L 11 11 11 33 <br /> % Recovery 107 108 108 108 <br /> Matrix <br /> pike Duplicate, ug/L 11 11 11 33 <br /> %Recovery 109 110 110 111 <br />-----elative°!o Difference --�-1=91=8-------1=8�2 7 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS101598A <br /> Date Prepared 10/15/98 10/15/98 10/15/98 10/15/98 <br /> Date Analyzed 10/15/98 10/15/98 10/15/98 10/15/98 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> LCS Recovery, ug1L 11 11 11 33 <br /> LCS% Recovery 109 110 110 111 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60-140 60-140 60-140 <br /> LCS 70130 70130 70-130 70-130 <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 /> IA A �ALpreparation 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 /> tPPenner interference the LCS recovery is to be used to validate the batch <br /> Penner <br /> Project Manager <br />