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4D <br /> Sequoia 680 Chesapeake Dnve Redwood City CA 94053 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo Analytical 819 Striker Avenue,SDRC 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Touchstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention ,teff Monroe OC Sample Group 6090634-655 Reported Sep 24, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# SP092096 SP092096 SP092096 SP092096 <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 Noll K Nill K Nill <br /> MS/MSD # 6091063 6091063 6091063 6091063 <br /> Sample Conc N D N D N D ND <br /> Prepared Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Analyzed Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Instrument 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 025 026 028 085 <br /> MS % Recovery 63 65 70 71 <br /> Dup Result 027 028 029 089 <br /> D % Recov 68 70 73 74 <br /> RPD 77 74 35 46 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 5LCS092396 5LCS092396 5LCS092396 5LCS092396 <br /> Prepared Date 9/23/96 9/23/96 9/23/96 9/23/96 <br /> Analyzed Date 9/23/96 9/23/96 9/23/96 9/23/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20 ug/L 20 u0/1- 20 ug/L 60 ug/L <br /> LCS Result 16 17 18 55 <br /> LCS % Recov 80 85 90 92 <br /> LCS 60-140 60-140 60140 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 /> the 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 Spoke,MSD=MS Duplicate, RPD=Relative% Difference <br /> Client Services Representative <br /> 6090634 TOU <11> <br />