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BSKANALYTICAL <br /> LABORATORIES <br />' Chanya Heang Certificate of Analysis <br /> Caltest Analytical Laboratory ELAP Certificate#1180 <br />' 1885 N Kelly Road Report Issue Date 09/16/2002 <br /> Napa, CA 945 5 8 <br />' BSK Submission # 2002090559 <br /> BSK Sample ID #: 247175 <br /> Project lD C090305 Protect Desc <br />' Submission Comments <br /> Sample Type Liquid Date Sampled 09/10/2002 <br /> Sample Description Effluent Flag City Chevron Time Sampled 1400 <br />' Sample Comments Date Received 09/11/2002 <br /> Inorganics prep Analysis <br />' Analyte Method Result Units MDL ML Dilution DLR Date Date <br /> Chromium-Hexavalent(Cr+6) EPA 218 6 030 µg/L 015 02 1 02 09/11/2002 09/11/2002 <br /> 1 <br /> DNQ=Detected,not quantified The trace values between the MDL and DLR are of an unknown data quality Baseline noise, <br /> calibration curve extrapolation below the lowest calibrator,method blank detections,and integration artifacts can all produce apparent <br /> DNQ values,which contribute to the un-reliability of these values <br />' mg/L Milligrams/Liter(ppm) MDL Method Detection Limit H Analyzed outside of hold time <br /> m Milli DLR Detection Limit for Reporting g/Kg grams/Kilogrdrri(ppm} ePo g P Preliminary result <br /> Micro ms/Liter <br /> uP�- b'm (ppb) PQL x Dilution 5 Suspect result See Cover Letter for comments <br />' <br /> AgfK9 cro Mib ND None Detected above MDL <br /> Micrograms/Kilogram am� tPp � E Analysis perforrned by External laboratory <br /> %Rec Percent Recovered(surrogates) ML Practical Quantitation Limit $ce External Laboratory Report attachments <br /> DNQ Detected,Not Quantified DNQ Trace Result(>MDL,<DLR) '.Grace results are only qualitative values(estimates) <br /> Report Authentication Code 11p11111Iplag Inc MIuIDunHilo ligiIfuHIHlll11.111 MI911 Page 1 of 1 <br /> 1414 Stanislaus Street Fresno CA 93706-1623 Phone 559-497-2888 In CA 800-877-8310 Fax 559-485-6935 <br />