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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 'Ir Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ?i Blame Tech Services, Inc ble'rit Project ID Shell Stockton %971224-D1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 s <br /> Attention Fran Thie Work Order# 9712F98-03 v v v rl rll ry Reported Jan 14, 1998, <br /> r r r rc rry ~ r i r+J + n r + t r r r + yr + vv s• <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch#. GC010698BTEX02A GC010698BTEX02A GC010698BTEX02A GCO10698BTEX02A GCO10698STEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A- Miraftab A-Miraftab A Miraftab A.Miraftab k Miraftab <br /> MS/MSD# 980100903 980100903 980100903 980100903 980100903 <br /> Sample Cone. N D N D N D N D N D <br /> Prepared Date 1/6/98 1/6/98 1/6/98 1/6/98 1/6/98 <br /> Analyzed Date 1/6/98 1/6/98 1/6/98 1/6/98 1/6/98 <br /> Instrument I.D.#' GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone Spiked. 10 jig/L 10 ug/L 10 pg/L 30 u9/L 60 Ng/L <br /> Result. 94 8 8 89 27 60 <br /> MS % Recovery 94 88 89 90 100 <br /> Dup Result 96 92 93 28 61 <br /> MSD % Recov. 96 92 93 93 102 <br /> RPD: 21 44 44 36 17 <br /> --- - RPD.Limit.,— 0-25 0-25- 0-25 0-25- 0-25=r --T <br /> LCS # BLK010698 BLK010698 BLK010698 BLK010698 BLK010698 <br /> Prepared Date: 1/6/98 1/6/98 1/6/98 1/6/98 1/6/98 <br /> Analyzed Date: 1/6/98 1/6/98 1/6/98 1/6/98 1/6/98 <br /> Instrument I D #- GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone Spiked 10ug/L 1ojig/L 10pg/L 30pg/L 60Ng/L <br /> LCS Result 96 91 92 28 60 <br /> LCS % Recov: 96 91 92 93 100 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagen <br /> S I ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of same! <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <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 /> Pe Penner <br /> Project Manager '"*MS=Matnx Spike, MSD=MS Duplicate,RPD=Relative%Difference 97121`98 BLA <2> <br />