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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-%00 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)911-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Shell 141 N EI Dorado <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9810725-10 Reported Oct 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 801018020, 6011602 <br /> Analyst C Medina <br /> ANALYTE 1,1-DCE TCE Chlorobenzene <br /> QC Batch# GC1019980VOA29A <br /> Sample No 981OA38-01 <br /> Date Prepared 10/16/98 10/16/98 10/16/98 <br /> Date Analyzed 10/17/98 10/17/98 10/17/98 <br /> Instrument I D# GCHP_29 GCHP_29 GCHP_29 <br /> Sample Conc , ug/L N D 1 6 ND <br /> Conic Spiked, ug/L 25 25 25 <br /> Matrix Spike, ug1L 16 15 15 <br /> % Recovery 64 54 60 <br /> Matrix <br /> pike Duplicate, ug/L 22 21 22 <br /> % Recovery 88 78 88 <br /> elative% Difference 32 36 38 <br /> RPD Control Limits 0-50 0-50 0-50 <br /> LCS Batch# VVVLCS101998A <br /> Date Prepared 10/19/98 10/19/98 10/19/98 <br /> Date Analyzed 10/19/98 10/19/98 10/19/98 <br /> Instrument I D# GCHP^29 GCHP_29 GCHP_29 <br /> Conc Spiked, ug]L 25 25 25 <br /> Recovery, ug/L 26 20 22 <br /> LCS% Recovery 104 80 88 <br /> Percent Recovery Control Limits <br /> F- <br /> MSIMSD 60140 60-140 60140 <br /> LCS 65-135 70-130 70130 70-130 70-130 70130 <br /> $EI <br /> nce Statement All standard operating procedures and quality control requirements have been met <br /> Please Note0 <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> N LYTICAL 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 entre analytical procedure If <br /> ecovery of analytes from the matrix spike does not fall within specified control limits due to matnx <br /> interf nce the LCS recovery is to be used to validate the batch <br /> erager <br />