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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-%00 FAX(650)364-9233 <br /> 404 N WlSet 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 /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blame Tech Services Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle OC Sample Group 9810743-24 Reported Oct 27, 1998 <br /> QUAL-ITWCONTROL--DATA-REP-ORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst A M <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC101798BTEX02A <br /> Sample No GW9810A18-10 <br /> Date Prepared 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Date Analyzed 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Instrument I D# GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone, ug1L N D N D N D N D <br /> Cone Spiked, uglL 10 10 10 30 <br /> Matrix Spike, uglL 86 69 92 27 <br /> % Recovery 86 89 92 90 <br /> Matrix <br /> pike Duplicate, uglL 91 93 97 28 <br /> % Recovery 91 93 97 93 <br /> elative%Difference 5 6-4-4-5-3-3-3 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC101798BTEX02A <br /> Date Prepared 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Date Analyzed 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Instrument I D# GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked, uglL 10 10 10 30 <br /> LCS Recovery, uglL 100 100 11 32 <br /> LCS%Recovery 1000 1000 110 107 <br /> Percent Recovery Control Limits <br /> MS/MSD 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 matrix that is analyzed using the same reagents . <br /> tPenner <br /> YTICA 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 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 /> Project Manager <br />