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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento,CA 95834 <br /> (916)9Z I-9600 <br /> Analytical FAX(916)921-0100 <br /> 4 www sequolalabs com <br /> Delta Environmental Consultants(Rancho Cordova Project Arco 2130, Stockton, CA <br /> 3164 Gold Camp Drive Ste 200 ProjectNumber N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Jay Johnson 04/02/01 11 56 <br /> BTEX by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPB <br /> LA..vte Result Limit U-ii•s Level Result %RF-C Limits RPD Limit Notes <br /> Batch 1030398-EPA 5030B [P/T] <br /> Blank(1030398-13LK1) Prepared&Analyzed 03/29/01 <br /> Benzene ND 2 00 u91, <br /> Toluene ND 200 " <br /> Ethylbenzene ND 200 " <br /> Xylenes(total) ND 200 " <br /> Surrogate 12 DCA-d4 409 Soo 818 60-140 <br /> Surrogate Toluene-d8 5-59 500 112 60-140 <br /> Surrogate 4-BFB 560 500 112 60-140 <br /> LCS(1030398-BS1) Prepared&Analyzed 03/29/01 <br /> Benzene 496 2 00 ug/I 300 992 70-130 <br /> Toluene 541 200 500 108 70-130 <br /> ate 12-DCA-d4 430 500 860 60-140 <br /> S ogate Toluene-d8 543 ol 500 109 60-140 <br /> Surrogate 4-BF3 574 " 500 11-) 60-140 <br /> Matrix Spike(1030398-MSI) Source 5103323-07 Prepared&Analyzed 03/29/01 <br /> Benzene �0 0 200 11g/1 500 ND 100 70-130 <br /> Toluene 544 200 50 0 ND 109 70-130 <br /> Surrogate 12-DC,4-d4 428 500 856 60-140 <br /> Surrogate Toluene-d8 541 500 108 60-140 <br /> Surrogate 4-BF3 565 500 113 60-140 <br /> Matrix Spike Aup(1030398-MSDI) Source 5103323-07 Prepared&Analyzed 03/29/01 <br /> Benzene 499 200 ug/1 300 ND 998 70-130 0200 25 <br /> Toluene A4 200 1. 500 ND 109 70-130 0 25 <br /> Surrogate 1 2-DCA-d4 440 " 500 88 0 60-140 <br /> Surrogate Toluene-d8 541 -)0 0 108 60-140 <br /> Surrogate 4-BFB .563 500 113 60-140 <br /> S a Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 11 of 14 <br />