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Drive 680 Chesapeake rive Redwood City, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Sequoia 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 /> eraghty& Miller, Inc Client Project ID Chevron #9-4275 <br /> 050 Marina Way South Matrix Solid <br /> Richmond, CA 94804 <br /> Attention Cynthia Hilton QC Sample Group 6111125-134 Reported Dec 4, 1996 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP120296 SP120296 SP120296 SP120296 <br /> 8020E)A 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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 6111865 6111865 6111865 6111865 <br /> Sample Cone N D N D N D N D <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 /> strument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 046 043 047 13 <br /> MS % Recovery 115 110 120 110 <br /> IISDup Result 042 039 043 12 <br /> D % Recov 105 98 110 100 <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 /> Instrument I D # HP-5 HP 5 HP-5 HP-5 <br /> ' Cone Spiked 20)_rg/L 20Mg/L 20ug/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 /> VUOIA 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 /> 1r�jl h 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 w*MS=Matrix Spike MSD=MS Duplicate, RFD=Relative% Difference <br /> 'Client Services Representative <br /> 6111125 GER <3> <br /> -- <br /> 0 ' — —-- <br />