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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 e Sacramento CA 95834 <br /> (916) 921 9600 e FAX (916) 921 0100 <br /> Aegis i;nvironmentai Consuitants Client Project 0 Sheii, 141 N El Dorado, Stockton F J <br /> 1050 Melody lane, Ste 160 Matrix Water <br /> Roseville CA 95678 <br /> Attention Paul Graff OC Sample Grouo 3110198-200 Reported Nov 18, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 1 Oichioroetnene Tnchloroetnene Benzene Toluene Chloro- <br /> benxene <br /> Method EPA 624 EPA 624 ==A 624 EPA 624 EPA 624 <br /> Analyst' S Hoffmann S Hotfmann 3 Hoffmann S Hoffmann S Hoffmann <br /> MS/MSD <br /> Batch# 931137902 931137902 -31137902 931137902 931137902 <br /> Date Prepared N/A N/A A N/A N/A <br /> DateAnalyze0 11/12/93 11/12/93 2/93 11/12/93 11/12/93 <br /> Instrument I D #• F3 F3 F3 F3 <br /> Conc. Spiked 50 ug/L 50 ugjL 1-0 4-0 ug/L 50 ug/L <br /> Mabu Spike <br /> 06 Recovery* 4 36 90 86 <br /> Matrix Spike <br /> Duniscate % <br /> Recovery 9 a ` 92 38 <br /> Relative % <br /> Difference 2 3 - 22 23 <br /> LCS Batch#• <br /> Date Prepared <br /> Date Analyzed <br /> Instrument 10 # <br /> LCS % <br /> Recovery- <br /> Recovery <br /> ecoveryecovery j <br /> Controi Limits- LCL 234 71 157 37 151 47-150 37-160 I <br /> Please Note <br /> The LCS Is a control sample of known,interterent free matrix that is analyzed rising the same reagents, <br /> SE0001A ANALYTICAL preparation and analvtical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known Quantities of soecmc comoounas and suolectea to the entire analyttcai proceaure if <br /> the recovery of anaivtes troth the matrix so,ke does not fall within specified control limits due to matrix <br /> interterence the LCS recovery is to be used to validate the batch <br /> Linda C Schneider <br /> Project Manager 3110198 AEG <14> <br />