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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 Striker 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 QC Sample Group 7070726-734 Reported Jul 25, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP071697 SP071697 SP071697 SP071697 <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 /> na yst K Nifl K Nil1 K Nill K Niil <br /> MS/MSD # 7070348 7070348 7070348 7070348 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Analyzed Date 7/16/97 7/16/97 7/16/97 7/16/97 <br /> nstrument 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 078 080 076 24 <br /> MS % Recovery 195 200 190 200 <br /> Dup Result 077 079 075 24 <br /> MSD % Recov 193 198 188 200 <br /> ' RPD 13 13 13 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> ' LCS # 4LCS071697 4LCS071697 4LCS071697 4LC8071697 <br /> ' Prepared Date 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Analyzed Date 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Instrument I D # HP 4 HP-4 � HP-4 HP-4 <br /> ' Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> LCS Result 19 19 18 56 <br /> LCS % Recov 95 95 90 93 <br /> LCS 50-150 50-150 50-150 50-150 <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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> mterFerence,the LCS recove 1s 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 <3> <br />