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' E 19 Sinker At c Ste R <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921 0100 <br />' wwNi sequotalabs coni <br />' Weston Solutions Inc-Walnut Creek Project San Joaquin HSA 5310130 <br /> 1575 Treat Bh d,Ste 212 Project Nunibcr 3rd Qu-irter Sampling Reported <br /> Walnut Creek CA,94596 Project Manager Jessica Levine 10/22/03 13 34 <br />' Gasoline (2-Metbylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Contr <br /> Sequoia Analytical - Sacramento <br />' Reporting Spike Source %REC RPD <br /> Analyte Resell Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 3100076-EPA 5030B(P/T) <br /> Matrix Spike(3100076-MSI) Source 5310102-04 Prepared&Analyzed 10/06/03 <br /> Benzene 9 81 050 ugll 100 ND 98 60-140 <br />' Toluene 10 0 0 50 100 ND 100 60-140 <br /> Ethylbenzene 10 4 050 10 0 ND 104 60 140 <br /> Xylenes(total) 28 7 0 50 300 ND 96 60-140 <br /> Surrogate a a a T ifluorotoheene 11 1 100 [it 60-140 <br />' Matrix Spike Dup(3100076-MSDI) Source S310102-04 Prepared&Analyzed 10/06/03 <br /> Benzene 9 91 050 ug/l 100 ND 99 60 140 1 25 <br /> Toluene 106 050 100 ND 106 60-140 6 25 <br /> Ethylbenzene 109 050 100 ND 109 60-140 5 25 <br /> Xylenes(total) 306 050 NO ND 102 60 140 6 25 <br /> Surrogate a a a Tri luorotoluene 11 3 100 113 60-140 <br /> 1 <br /> 1 <br />' Sequoia Analytical- Sacramento The results in ibis report apply to the samples analyzed to aerordarec e»ah the chain of <br /> custodt document Unless other slue stated results are repotted on a ii et a eight bases <br /> This anal)fecal report must he reproduced in as enpe err <br />' Page 5 of 6 <br />