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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X117 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> chstone Development Client Project ID Chevron #9-2033 <br /> O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090634-655 Reported Sep 24, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene <br /> Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP092096 SP092096 SP092096 SP092096 <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 K Nill K Nill K Nill K Nill <br /> MS/MSD # 6091063 6091063 6091063 6091063 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Analyzed Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> Cone Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 033 033 036 11 <br /> MS % Recovery 83 83 90 92 <br /> 0 Dup Result 034 034 036 11 <br /> D % Recov 85 85 90 92 <br /> RPD 30 30 00 00 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> LCS # 2LCS092096 2LCS092096 2LCS092096 2LCS092096 <br /> Prepared Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Analyzed Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Cone Spiked 20 yg/L 20 ug/L 20 pg/L 60 ug/L <br /> LCS Result 19 20 21 63 <br /> LCS % Recov 95 100 105 105 <br /> LCS 60140 60-140 60-140 60-140 <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 /> S UOIA 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 It <br /> �( ecovery 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 /> Melissa A Brewer *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Client Services Representative <br /> 6090634 TO U <8> <br />