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Sequoia 885 Jarvis Drive <br /> Morgan Hili CA 95037 <br /> 1 (408)776 9600 <br /> 2-6308 <br /> Analytical FAX equo78bscom <br /> www sequoialabs tom <br />' <br /> Hydro-Geo Consultants, Inc Projcct Hydro-Geo <br /> 2477 Porterfield Ct ProjLct Number 242 N Sutter St Reported <br /> Mountain View CA,94040 Project Managei John O'Rourke 09/24/01 14 45 <br />' Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgans Hill <br /> Reporting Spike Source %REC RPD <br /> lAnaiyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 1I22010-EPA 503011 PIT <br /> Blank(1122010-BLKI) Prepared&Analyzed 09/20/01 <br /> Ethanol ND 400 ug/l <br />' tert-Butyl alcohol ND 20 ;1 <br /> Methyl tert-butyl ether ND 1 0 <br /> DI-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 1 0 " <br />' tert-Amyl methyl ether ND 10 ; <br /> 1,2-Dichloroethane ND 10 <br /> Ethylene dibromide ND 1 0 " <br /> Surrogate 11-Dichloroethane-d4 988 100 988 70-130 <br /> LCS(1122010-BSI) Prepared&Analyzed 09/20/01 <br /> sloWethyl tert-butyl ether 923 10 ug/l 100 923 70-130 <br /> rrogate 12-Dichloroethane-d4 106 100 106 70-130 <br /> LCS Dup(1I22010-BSD1) Prepared&Analyzed 09/20/01 <br />' Methyl tent butyl ether -- — 7 62 _- _ 10 ugll _ 100 762 70130 19 l 425 _— — <br /> Surrogate 1 2-Dichloroethane-d4 9 57 10 0 957 70-130 <br /> Matrix Spike(1122010-MS1) Source MKI0231-12 Prepared&Analyzed 09/20/01 <br /> 1 Methyl tert-butyl ether 4470 200 ug/l 2000 3500 485 70-130 A-01,QM-07 <br /> Surrogate 1 2-Dichloroethane-d4 963 11 100 963 70-130 A-01 <br />' Matrix Spike Dup(1122010-MSD1) Source MKI0231-12 Prepared&Analyzed 09/20/01 <br /> Methyl tert-butyl ether 3920 200 ug/i 2000 3500 21 0 70-130 13 1 25 A-01,QM-07 <br /> Surrogate 1 2-Dichloroethane-d4 946 100 946 70-130 A-Q1 <br />' Batch 1124021 -EPA 5030B PIT <br /> Blank(1124021-BLKI) Prepared&Analyzed 09/21/01 <br />' Ethanol ND 400 ug/l <br /> tert-Butyl alcohol ND 20 <br /> Mcthyl tort-butyl ether ND 1 0 " <br /> DI-isopropyl ether ND 1 0 <br /> Ethyl tert-butyl ether ND 1 0 ; <br /> tert-Amyl methyl ether ND 10 <br /> 1,2-Dichloroethane ND to " <br /> uoia Analytical-Morgan Hill q Yt g The results to this report apply to the samples analyzed in accordance with the thorn of <br /> custody document This analytical report must be reproduced in its entirely <br />' Page Page 7 of 9 <br />