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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819$taker Avenue Suite 8 Satratnento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> eraghty & Miller, Inc Client Project ID Chevron #9-4275 <br /> 050 Marina Way South Matrix Solid <br /> ichmond, CA 94804 <br /> Attention Cynthia Hilton OC Sample Group 6111101-124 Reported Dec 12, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl xylenes <br /> Benzene <br /> QC Batch# SP120296 SP120296 SP120296 SP120296 <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 /> ' <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 6111865 6111865 6111865 6111865 <br /> Sample Cone ND ND ND ND <br /> Prepared Date 12/2/96 12/2/96 12/2/96 12/2/96 <br /> Analyzed Date 12/2/96 12/2/96 12/2/96 12/2/96 <br /> nstrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 0 46 043 047 13 <br /> MS % Recovery 115 108 118 108 <br /> IRDup Result 042 039 043 12 <br /> ISD % Recov 105 98 108 100 <br /> ' RPD 91 98 89 80 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 5LCS120296 5LCS120296 5LCS120296 5LCS120296 <br /> Prepared Date 12/2/96 12/2/96 12/2/96 12/2/96 <br /> Analyzed Date 12/2/96 12/2/96 12/2/96 12/2/96 <br /> nstrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20pg/L 20pg/L 20frg/L 60ug/L <br /> ' LCS Result 19 18 19 55 <br /> LCS % Recov 95 90 95 92 <br /> LCS 60-140 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 /> 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 If <br /> a 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 /> Melissa A Brewer **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Client Services Representative <br /> ' 6111101 GER <10> <br />