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I <br /> I <br /> . CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br /> Certificate No 2079 Fax (209)384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Rainwater Car Wash Method TPH-Diesel <br /> ' of Northern California Reference Number 3387 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matnx Water Prepared 12-22-00 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 12-22-00 <br /> Attn Tim Cuellar Reported 12-27-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units uglL <br /> ' LCS Batch# TPHOW-D220 <br /> ' LCSA%Recovery 807% <br /> LCSB%Recovery 772% <br /> Control Lim3fs 55-130% <br /> Relative% Difference 436% <br /> ' MSIMSD Batch# TPHDW-D220 <br /> MS %Recovery See Note <br /> MSD%Recovery See Note <br /> Relative% Difference See Note <br /> ' Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <br /> ' The LCS(Laboratory Check Sample)is a control sample of known interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery is used for validation <br /> of sample batch results Due to matrix effects the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> ' reject batch results <br /> r <br /> f <br /> ANALYST APPROVED BY i <br /> Clarr.1 Cone J es hrllrps <br /> ' Environmental Lab Director <br />