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' Sequoia 680 Chesapeake Drive 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 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Geraghty& Miller, Inc Client Project ID Chevron #9-4275 <br /> 1050 Marina Way South Matrix Solid <br /> Richmond, CA 94804 <br /> Attention Aaron O'Brien OC Sample Group 7070726-734 Reported Jul 25, 1997 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# SP071797 SP071797 SP071797 SP071797 <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 K Nill K Nill K Nill K Nill <br /> MS/MSD # 7070659 7070659 7070659 7070659 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> iAnalyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> nstrument 1 D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 085 086 082 26 <br /> MS % Recovery 213 215 205 217 <br /> IRDup Result 082 084 081 26 <br /> SD % Recov 205 210 203 217 <br /> ' RPD 36 24 12 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 4LCS071797 4LCS071797 4LCS071797 4LCS071797 <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> nstrument I D # HP 4 HP-4 HP-4 HP-4 <br /> Cone Spiked 20Erg/L 20yg/L 20Ng/L 60ug/L <br /> ' LCS Result 18 19 17 54 <br /> LCS % Recov 90 95 85 90 <br /> LCS 50-150 50-150 50-150 50-150 <br /> Control Limits <br /> l <br /> Please Note <br /> The LCS.is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> llOIA 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 /> Qthe 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 /> 7070726 GER <4> <br />