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1885Se uoia Morgan Jarvis Drive <br /> Hill CA 95037 <br /> 1 (408)776-9600 <br /> Analytical wFAX(408)781 6308 <br /> ww sequoialaUs com <br /> I <br /> Hydro-Geo Consultants, Inc Project Hydro-Geo <br /> 2477 Porterfield Ct Project Number 242 N Sutter St Reported <br /> Mountain View CA,94040 Project Manager John O'Rourke 09/24/01 14 45 <br />' Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br />' Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 1124021 -EPA 5030B PIT <br /> Blank(1124021-BLKI) Prepared&Analyzed 09/21/01 <br /> Ethylene dibromide ND 10 ug/1 <br />' Surrogate 1 2-Dichloroethane-d4 952 100 952 70-130 <br /> LCS(1124021-BSI) Prepared&Analyzed 09/21/01 <br /> Methyl tert-butyl ether 731 1 0 ug/l 100 73 1 70-130 <br /> Surrogate 11-Dichloroethane-d4 8.50 100 880 70-130 <br /> LCS Dup(1I24021-BSDI) Prepared&Analyzed 09/21/01 <br />' Methyl tent-butyl ether 723 10 ug/l 100 723 70-130 1 10 25 <br /> Surrogate 11-Drchloroethane-d4 906 Io 100 906 70-130 <br /> Matrix Spike(1124021-MSI) Source MKI0282-03 Prepared&Analyzed 09/21/01 <br /> FOrrogafe <br /> thyl tert-butyl ether 220 10 ug/l 100 110 110 70-130 <br /> 12-Dichloroelhane-d4 909 1100 909 70-130 <br /> Matrix Spike Dup(1124021-MS1)1) Source MKI0282-03 Prepared&Analyzed 09/21/01 <br />' Methyl tent-butyl ether 222 _ 10 ug/l _ 100 _ 110_ 112 70-130 0 905 _25 <br /> Surrogate 12-Dichloroethane-d4 922 100 912 70-130 <br /> I <br /> H Morgan� <br /> uoia Analytical- it�1 Y � 1 The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entitety <br /> IPage Page 8 of 9 <br />