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Drive <br /> ."Y' 885 Janis <br /> Sequoia Morgan Hill CA95037 <br /> 5b37 <br /> (408)776-9600 <br /> 4 Analytical FAX(408)792-6308 <br /> www sequoialabs com <br /> URS Corporation [Arco 11 Project ARCO#5469, Stockton,CA MPC0315 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/30/06 14 47 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - 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 6C14050-General Preparation/EPA 160 1 <br /> Blank(6C14050-BLKI) Prepared 03/08/06 Analyzed 03/09/06 <br /> Total Dissolved Solids 88000 10000 ugll MB <br /> Laboratory Control Sample(6C14050-BSI) Prepared 03/08/06 Analyzed 03/09/06 <br /> Total Dissolved Solids 540000 10000 ug/l 500000 108 80-120 <br /> Matrix Spike(6CI4050-MS1) Source MPC0315-08 Prepared 03/08/06 Analyzed 03/09/06 <br /> Total Dissolved Solids 1220000 20000 ug/l 500000 640000 116 80-120 <br /> Matrix Spike Dup(6C14050-MSD1) Source MPCO315-08 Prepared 03/08/06 Analyzed 03/09/06 <br /> Total Dissolved Solids 1170000 20000 ug/1 500000 640000 106 80-120 4 20 <br /> Batch 6CO8005-General Preparation/EPA 365 2 <br /> Blank(6CO8005-BLKI) Prepared&Analyzed 03/07/06 <br /> 41hate(Ortho)as P ND 10 ug/l <br /> ratory Control Sample(6CO8005-BS1) Prepared&Analyzed 03/07/06 <br /> Phosphate(Ortho)as P 390 10 ug/l 400 98 70-130 <br /> Matrix Spike(6CO8005-MSI) Source MPC0315-01 Prepared&Analyzed 03/07/06 <br /> Phosphate(Ortho)as P 328 10 ug/l 250 70 103 70-130 <br /> Matrix Spike Dup(6CO8005-MSD1) Source MPCO315-01 Prepared&Analyzed 03/07/06 <br /> Phosphate(Ortho)as P 314 10 ugIl 250 70 98 70-130 4 10 <br /> Batch 6C15025- General Preparation/EPA 410 4 <br /> Blank(6C15025-BLKI) Prepared&Analyzed 03/15/06 <br /> Chemical Oxygen Demand ND 30000 ug/l <br /> �uoia Analytical-Morgan Hill The results in this report apply to the samples analyred in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 25 of 29 <br />