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0,25%0 <br /> North State Environmental Laboratory CA FLAP# 1753 <br /> 90 South Spruce Avenue, Suite V • South San Francisco, CA 94080 • (650) 266-4563 • FAX (650) 266-4560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Job Number 00--0423 Date Sampled 03/23/2000 <br /> Client western Geo-Engineers Date Analyzed 04/06/2000 <br /> Project R603/R603-Sewer Date Reported 04/11/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 00-0423 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix WATER WATER <br /> Analyte Results %Recoveries <br /> ug/L <br /> o-Xylene ND<1 <br /> Styrene ND<l <br /> Bromoform ND<l <br /> Isopropylbenzene ND<1 <br /> Bromobenzene ND<l <br /> 1,1,2,2-Tetrachloroethane ND<1 <br /> n-Propyl Benzene ND<l <br /> 2-Chlorotoluene ND<1 <br /> 4-Chlorotoluene ND<l <br /> 1,3,5-Trimethylbenzene ND<l <br /> tert-Butylbenzene ND<l <br /> 1,2,4-Trimethylbenzene ND<l <br /> 1,3-Dichlorobenzene ND<l <br /> 1,4-Dichlorobenzene ND<l <br /> sec-Butylbenzene ND<1 <br /> 1,2-Dichlorobenzene ND<l <br /> p-rsopropyltoluene ND<1 <br /> n-Butylbenzene ND<l <br /> 1,2-Dibromo-3-chloropropa ND<l <br /> Naphthalene ND<l <br /> 1,2,4-Trichlorobenzene ND<l <br /> Hexachlorobutadlene ND<l <br /> 1,2,3-Trichlorobenzene ND<l <br /> 1,2,3-Trichloropropane ND<l <br /> SUR-Dibromoflucromethane 102% Rec 81/84 4 <br /> SUR-Toluene d8 81% Rec 99/101 2 <br /> SUR-4-Bromofluorobenzene 67% Rec 96/92 4 <br /> Re ewed pr ve <br /> John A Murphy <br /> Laboratory Director <br /> Is <br /> Page 4 Of 4 <br />