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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> 4 (925) 988-9600 <br /> 1a)1„) Analytical FAX(925)988-9673 <br /> er Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite 1 Project Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Mike Mitchener 08-Sep-99 14 55 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC =RPDAnalyte Result Limit Units Level Result %REC Limits RPD <br /> BatLh 9107010 Prepared 06-Sep-99 Using EPA 5030B [PIT] <br /> Blank(9I07010-13LK1) <br /> Ethanol ND 500 uv,/l <br /> tert Butyl alcohol ND 100 <br /> Nlethyl telt-butyl ether ND 20 <br /> Dr isopropyl ether ND 20 <br /> Ethyl tart-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Drbiomof itoromethane 500 500 100 50-150 <br /> Surrogate 1 2-Drehloroethane-d4 490 500 980 50-150 <br /> LCS(9107010-BSI) <br /> Nf:thy]tent butyl ether 517 20 ug/l 500 103 70 130 <br /> Sze Dibrornofluoromethane .500 500 100 50-150 <br /> S ate 12-Drchloroethane-d4 490 500 980 50-150 <br /> M,itrix Spike(9107010-MSI) Source W908479-03 <br /> bfethyl tent-butyl ether 66 9 20 ug/l 500 20 130 60 140 <br /> Surrogate Drbromofluorornethane 500 500 100 50 150 <br /> Surrogate 12-Drchlor oethane-d4 480 500 960 50-150 <br /> Matrix Spike Dup(9107010-MSD1) Source W908479-03 <br /> Nfethyl tent butyl ether 540 20 ug/l 500 20 104 60-140 213 25 <br /> Surrogate Drbrornofluoromethane 490 500 980 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 480 500 960 50-150 <br /> Sequoia Analytical -Walnut Creek The resw Its in th s report apply to the samples analyzeden accordance with the chcun of <br /> • custody document Tins analytical report must be reproducedin its entirety <br /> TUT cul eg ey, mject anagen Page 7 of 8 <br />