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4D (408)i885 Jarvis DriveSegUQ]aMorgan Hill,CA 9503750377776-9600 <br /> Analytical FAX(409)782 6308 <br /> www sequwalabs com <br /> URS Corporation[Arcola Project ARCO#5469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number 009JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 1[2 53 <br /> Anions by EPA Method 300.0 - 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 5C28016-General Preparation/EPA 300 0 <br /> Blank(5C28016-BLKI) Prepared&Analyzed 03/17/05 <br /> Phosphate(Ortho)as P ND 1000 ug/l <br /> Sulfate as SO4 ND 500 " <br /> Nitrate as NO3 ND 500 " <br /> Laboratory Control Sample(5C28016-BS1) Prepared&Analyzed 03/17/05 <br /> Phosphate(Ortho)as P 2450 1000 ug/l 2500 98 70-130 <br /> Sulfate as SO4 10000 500 10000 100 80-120 <br /> Nitrate as NO3 9520 500 10000 95 80-115 <br /> Matrix Spike(5C28016-MSI) Source N1000460-01 Prepared&Analyzed 03/17/05 <br /> Phosphate(Ortho)as P 242000 100000 ug/l 250000 58 97 70-130 <br /> Sulfate as SO4 1010000 50000 1000000 13000 100 80-120 <br /> We as NO3 957000 50000 1000000 ND 96 80-115 <br /> ix Spike Dnp(5C28016-MSD1) Source M000460-01 Prepared&Analyzed 03/17/05 <br /> Phosphate(Ortho)as P 250000 100000 ug/l 250000 58 100 70-130 3 10 <br /> Sulfate as SO4 1010000 50000 1000000 13000 100 80-120 0 10 <br /> Nitrate as NO3 955000 50000 1000000 ND 96 80-115 02 10 <br /> oia Analytical-Morgan Hill The results in this report apply to the samples analyzed 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 27 of 30 <br />