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Sequoia 819StrikerAve Ste <br /> Sacramento CA 95834834 <br /> 16Q • (916)921 9600 <br /> A n alytica I FAX c9l�921.0100 <br /> www sequoialabs com <br /> 1 <br /> Geological Technics,Inc Project Montas Bros S501355 <br /> ' 1101 7th Street Project Number 724 2 Reported <br /> Modesto CA,95354 Project Manager Mandeep Singh 01/28/05 11 51 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B- Quality Control <br /> ' Sequoia Analytical- Sacramento <br /> Reporting Spoke Source °/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5010235-EPA 5030B VT)/EPA 8015B/8021B <br /> Blank(5070235-BLK1) Prepared&Analyzed 01/17/05 <br /> Gasoline Range Organics(C4 C12) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> ' Ethylbenzene ND 0 50 11 <br /> Xylenes(total) ND 0 50 <br /> Surrogate 4-BFB(FID) 979 100 98 60-140 <br /> Surrogate aa a-TFT(PID) 899 100 90 60-140 <br /> Blank(5010235-BLK2) Prepared&Analyzed 01/18/05 <br /> Gasoline Range Organics(C4-C12) ND 50 ugn <br /> Benzene ND 0 50 " <br /> oluene ND 050 " <br /> ylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> ' Surrogate 4-BFB(FID) 112 100 112 60-140 <br /> Surrogate a,a a-TFT(PID) 880 100 88 60-140 <br /> Laboratory Control Sample(5010235-BSI) Prepared&Analyzed 01/17/05 <br /> ' Benzene 9 39 050 no 10 0 94 70-130 <br /> Toluene 923 050 100 92 70-130 <br /> Ethylbenzene 9 19 050 10 0 92 70-130 <br /> Xylenes(total) 274 0 50 300 91 70-130 <br /> Surrogate 4-BFB(FID) 104 „ 100 104 60-140 <br /> Surrogate a,a a-TFT(PID) 893 100 89 60-140 <br /> Laboratory Control Sample(5010235-BS2) Prepared&Analyzed 01/18/05 <br />' Benzene 9 69 050 ugA too 97 70-130 <br /> Toluene 9 65 050 10 0 96 70-130 <br /> Ethylbenzene 979 050 100 98 70-130 <br /> Xylenes(total) 29 3 050 300 98 70-130 <br /> Surrogate 4-BFB(FID) 10 6 100 106 60-140 <br /> Surrogate a a a-TFT(PID) 922 100 91 60-140 <br /> iSequoia Analytical- Sacramento 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 entirely <br /> Page 15 of 19 <br />