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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4D- 404 N Weget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Su1te 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *oUChstone Developments Client Project ID Chevron #9-8264 <br /> P 0 Box 2554 Matrix Solid <br /> Santa Rasa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 5111262-269 Reported Nov 29, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP112795 SP112795 SP112795 SP112795 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst M Creusere M Creusere M Creusere M Creusere <br /> MS/MSD # 5112014 5112014 5112014 5112014 <br /> Sample Conc . N D N D N D N D <br /> Prepared Date 11/27/95 11/27/95 11/27/95 11/27/95 <br /> Analyzed Date 11/27/95 11/27/95 11/27/95 11/27/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result: 037 039 039 1 2 <br /> MS % Recovery 93 98 98 99 <br /> Dup Result 036 038 039 12 <br /> MSD % Recov 90 95 98 98 <br /> RPD 27 26 00 084 <br /> RPD Limit. 0-20 0-20 0-20 0-20 <br /> LCS # 2LCS112795 2LCS112795 2LCS112795 21-CS112795 <br /> Prepared Date 11/27/95 11/27/95 11/27/95 11/27/95 <br /> Analyzed Date 11/27/95 11/27/95 11/27/95 11/27/95 <br /> Instrument I D.# HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20ug/L 20ug/L 60ug/L <br /> LCS Result 20 21 21 63 <br /> LCS % Recov .. 99 104 105 105 <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 <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, #1271 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 /> ArTethh <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recove is to be used to validate the batch <br /> Knver ** <br /> Prect Manager MS=Matrix pike,M D=MS Duplicate, RPD=Relative%Difference <br /> oj <br /> 5111262 TTT <5> <br />