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Sequoia <br /> 819 r Avenue Suite$ <br /> \V Sacraacra mento CA 95834 <br /> (916)921-9600 <br /> FAx(916) <br /> Analytical www sequollabs alabsc00 <br /> w corn <br /> Delta Environmental Consultants(Cameron Park) Project Arco 2130,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Steve Carter 01/02/02 12 24 <br /> BTEX by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result lama Units Level Result %REC Limits RPD Limit Notes i <br /> I <br /> Batch 1120253-EPA 5030B [P/TJ <br /> Blank(1120253-BLKI) Prepared&Analyzed 12/20/01 <br /> Benzene ND l0 ugA <br /> Toluene ND 10 " <br /> F.thylbenzene ND 10 " <br /> Xylenes(total) ND 10 " <br /> Surrogate 12-DCA-d4 289 250 116 60-140 <br /> Surrogate Toluene-d8 249 2.50 996 60-140 <br /> Surrogate 4-BFB 229 250 916 60-140 <br /> LCS(1120253-BSI) Prepared&Analyzed 12/20/01 <br /> Benzene 245 1 0 ugA 250 980 70-130 <br /> A1190luene 249 10 250 992 70-130 <br /> urrogate 12-DCA-d4 276 250 110 60-140 <br /> Surrogate Toluene-d8 232 250 .928 60-140 <br /> Surrogate 4-BFB 236 230 944 60-140 <br /> Matrix Spike(1120253-MSI) Source S112131-05 Prepared&Analyzed 12/20/01 <br /> Benzene 238 1 0 ug/t 250 ND 952 70-130 <br /> Toluene 252 10 250 ND 995 70-130 <br /> Surrogate 1 2-BCA-d4 243 250 972 60-140 <br /> Surrogate Toluene-d8 236 250 944 60-140 <br /> Surrogate 4-BFB 21 6 250 864 60-140 <br /> Matrix Spike Dup(1120253-MSD1) Source S112131-05 Prepared&Analyzed 12/20/01 <br /> Benzene 24 1 10 ugA 250 ND 964 70-130 125 25 <br /> Toluene 261 10 " 250 ND 103 70-130 3 51 25 <br /> Surrogate 1 2-DCA-d4 263 250 113 60-140 _ T <br /> Surrogate Toluene d8 23 7 250 948 60-140 <br /> Surrogate 4-BFB 22 7 250 908 60-140 <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 9 of 13 <br />