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_ ANALYTICAL <br /> BSKLABORATORIES - <br /> Charlya Heang Certificate of Analysis <br /> Caltest Analytical Laboratory ELAP Certificate #1180 <br /> 1885N Kelly Road Report Issue Date 09/16/2002 <br /> Napa, CA 94558 <br /> BSK Submission#: 2002090559 <br /> BSK Sample ID#: 247175 <br /> Project 1D C090305 Project 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 Comn.ents Date Received 09/11/2002 <br /> Inorganics Prep Analysis <br /> Analyte Method Result Units MDL ML Dilution DLR Date Date <br /> Chronuum-Hexavalent(Cr+6) LPA 218 6 0.30 ug/L 015 02 1 02 09/11/2002 09/11/2002 <br /> • <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 Mtlltgrants/Liter(ppm) MDL Method Detection Limit H Analyzed outside of hold time <br /> mg/Kg Milligrams/Kilogram(ppm) DLR Detection Lumt for Reporting P Prelmvnary result <br /> gg/L micrograms/Liter(ppb) PQL x Dilution <br /> ND HDetected above MDL S Suspect result See Cover Letter for wmnients <br /> Jig/Kg Micrograms/Kilogram(ppb) one E Analysts performed by External laboratory <br /> %Rm Percent Recovered(surrogates) ML Practical Quantitation Ltriut <br /> ( � ) See External Laboratory Report attachments <br /> DNQ Detected,Not Quantificd DNQ Trace Result(>MDL,<DLR) Trace results are only qualitative values(estimates) <br /> Report Authentication Code 11110 WE 111110110111Ill11IIJMIIII III 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 />