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t Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wsget Lane Walnut Creels,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0 100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970402-F1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9704278 -01, 03 -05 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. GC041197BTEX18A GC041197BTEX18A GCO41197BTEX18A GC041197BTEX18A GC041197STEX18A <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 R Geckler R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD# 970305303 970305303 970305303 970305303 970305303 <br /> Sample Conc : ND ND ND ND ND <br /> Prepared Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Analyzed Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked: 10 pg/L 10 pg/L 10 Ng/L 30 Ng/L 60 Ng/L <br /> Result 93 93 92 27 65 <br /> S % Recovery 93 93 92 90 108 <br /> 40 <br /> Dup Result 94 95 92 27 65 <br /> WiSD % Recov 94 95 92 90 108 <br /> RPD. 11 21 00 00 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 0-50 <br /> LCS # BLK041197BSA BLK041197BSA BLK041197BSA BLK041197BSA BLK041197BSA <br /> Prepared Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Analyzed Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Instrument I D.#' GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc. Spiked long/L 10 pg/L 10 ug/L 30 pg/L 60 pg/L <br /> LCS Result 97 97 97 29 62 <br /> LCS % ReCov 97 97 97 97 103 <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 reagents, <br /> A ANALYTICAL 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 /> gg enner <br /> 7Poject <br /> Manager *'MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9704278 6 L 41> <br />