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Sequoia 680 Chesapeake Dcivc Red Wood City CA 94061 (4 15) 364 9600 FAX(4151 364 9215 <br /> AAnalytical <br /> , } Ont N eget Lane Walnut Crcck CA 94594 (510) 943 9601) FAX ()to) 994 9673 <br /> n a]ly l i C a l 819 Striker Avenue CA to 8 Sacramento CA 95814 (916) 921 9600 FARC (916)92( 0100 <br /> Environmental ResolUtlOnS Client Project ID Unocal 5886, 205503 <br /> 74 Digital Drive Ste 6 Matrix Solid <br /> Novato, CA 94949 <br /> Attention Keith Romstad Work Order # 9704614 01 04 Reported May 2 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC0501978TEXEXA GC050197BTEXEXA GC050197BTEXEXA GC0501978TEXEXA GCO50197BTEXEXA <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 Porter A Porter A Porter A Porter A Porter <br /> MS/MSD # 9704E6101 9704E6101 9704ES101 9704E6101 9704E6101 <br /> Sample Conc N D N D N D N 0 N D <br /> Prepared Date 5/1/97 5/1/97 5/1/97 5/1/97 5/1/97 <br /> Analyzed Date 5/1/97 5/1/97 5/1/97 5/1/97 5/1/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conic Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 018 0 18 0 18 055 11 <br /> MS % Recovery 90 90 90 92 92 <br /> Dup Result 018 018 018 053 11 <br /> MSD % Recov 90 90 90 88 92 <br /> RPD 00 00 00 37 00 <br /> RAD Limit 0-25 0-25 025 0-25 0 25 <br /> LCS # BLK050197$SA BI-KO50197BSA LK0501978SA BLK050197BSA BLK050197BSA <br /> Prepared Date 5/1/97 5/1/97 5/1/97 5/1/97 5/1/97 <br /> Analyzed Date 5/1/97 5/1/97 5/1/97 5/1/97 5/1/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 021 0 21 0 21 062 12 <br /> LCS % Recov 105 105 105 103 100 <br /> 60-140 60-140 60-140 60 140 60-140 <br /> LCS 70130 70-130 70130 70-130 70130 <br /> Control Limits <br /> i <br /> i <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA 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 p.ocedure If <br /> ?, the recovery of analytes from the matrix spike does not fall within specified control hmits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kevin Follett <br /> Project Manager "MS=Matr:x Spike,MSD=MS Duplicate PPD=Relative°a Difference 9704814 EEE <3> <br />