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Sequoia680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N IV Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Geraghty & Miller, Inc Client Project ID Chevron 09-4275 <br /> 1050 Manna 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 /> Analyst K Nill K NO K Nil] K Nill <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 /> 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 078 080 076 24 <br /> A�°(o Recovery 195 260 190 200 <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 4LCS071697 <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 HP4 HP-4 HP-4 <br /> Conc Spiked 20 erg/L 20 ug/L 20 pg/L 60 pg/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 /> S 01A 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 lomits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer *'MS=Matrix Spike,MSO=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7070726 GEA <3> <br />