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r c <br /> 680 Chesapeake Drive Redwood City CA 94053 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 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)921-0100 <br /> lzw 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 1071 N Main St <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9810727-02-05 Reported Oct 23, `1998 - <br /> -QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC/GR <br /> r' <br /> i <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC101598BTEX17A r <br /> Sample No GW9810221-1 <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# GCHP17 ' GCHP17 GCHP17 GCHP17 <br /> Sample Cone, ug/L N D N D N D N D ti <br /> Cone Spiked,ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 11 31 <br /> % Recovery 111 107 111 102 <br /> Matrix <br /> pike Duplicate, ug/L 11 10 11 30 . <br /> % Recovery 107 104 108 99 <br /> elative% Difference 37 2 8 27 30 <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# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked, ug/L- _ ~10 10 10 30 <br /> LCS Recovery, ug/L. 12 11 12 32 <br /> LCS% Recovery 116 114 117 108 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 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 matnx that is analyzed using the same reagents <br /> fPeggyP <br /> TICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample . <br /> fortified t#rit 6; n quantities of specific compounds and subjected to the entire analytical procedure If <br /> e 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 /> ' <br />