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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ID <br /> 404 11 Wrget Lane Walnut Creek,CA 94599 (510) 988 9600 FAX(510)988 9673 <br /> IAnalytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-2033 /980209-A2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9802713-01-03 Reported Mar 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22198802004A GCO22198802004A GCO22198802004A GCO22198802004A GCO22198802004A <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 s L S L s L SL S L <br /> M S/MSD# 98020513 98020513 98020513 98020513 - <br /> Sample Cone N D N D N D N D - <br /> Prepared Date 2/21/98 2/21/98 2/21/98 2/21/98 - <br /> Analyzed Date 2/21/98 2/21/98 2/21/98 2/21/98 - <br /> Instrument I D # GC4 GC4 GC4 GC4 - <br /> Cone Spiked 20 yg/L 20 ug/L 20 Mg/L 60 Wg/L - <br /> Result 185 192 202 605 - <br /> MS % Recovery 93 96 101 101 _ <br /> Dup Result 201 209 222 665 <br /> MSD % Recov 101 105 111 111 <br /> RPD 83 85 94 94 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # LCS022198 LCS022198 LCS022198 LCS022198 LCS022198 <br /> Prepared Date 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Analyzed Date 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Instrument I D #- GC4 GC4 GC4 GC4 GC4 <br /> Cone. Spiked 20 erg/L 20 Ng/L 20 pg/L 60 pg/L 500 ftg/L <br /> LCS Result 20 208 221 641 435 <br /> LCS % Recov 100 104 111 107 87 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> ap#2142 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 It <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 y Penner <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9802713 BLA <3> <br />