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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 40 <br /> 4" Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Stnker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> touchstone Developments Client Project ID Chevron #9-8264 /Tracy <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA <br /> Attention Jeff Monroe QC Sample Group 5111031-036 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. SP111495 SP111495 SP111495 SP111495 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8024 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst K Nil] K Nill K Nill K Nill <br /> MS/MSD # 5111033 5111033 5111033 5111033 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/14/95 11/14/95 11/14/95 11/14/95 <br /> Analyzed Date 11/14/95 11/14/95 11/14/95 11/14/95 <br /> Instrument I D #. HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result- 044 042 044 13 <br /> MS % Recovery 110 105 110 110 <br /> Dup Result 044 043 045 13 <br /> MSD % Recov 110 108 113 111 <br /> RPD 00 23 22 075 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # 2LCS111495 2LCS111495 2LCS111495 2LCS111495 <br /> Prepared Date 11/14/95 11/14/95 11/14/95 11/14/95 <br /> Analyzed Date 11/14/95 11/14/95 11/14/95 11/14/95 <br /> Instrument 1.13 #. HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> LCS Result 20 20 21 51 <br /> LCS % Recov 100 98 103 102 <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> The LCS is a control sample of known, interferent4ree matrix that is analyzed using the same reagents, <br /> S 101.110I 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 recoveryis to be used to validate the batch <br /> Ken eth L imer **MS=Matrix Spike, M D=MS Duplicate, RPD=Relative%Difference <br /> Prol t Manager <br /> ,p 5111031 TTT <5> <br /> `bd' <br />