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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 Enviro n mental, Inc Client Project 11) Nomellini Const Method TPH-Diesel <br /> of Northern California Reference Number 2972 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 4-25-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-28-00 <br /> Attn Tim Cuellar Reported 5-1-00 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units uglL <br /> LCS Batch# TPHDW-4250 <br /> I LCSA% Recovery 915% <br /> LCSB% Recovery 837% <br />' • Control Limits 75-130% <br /> Relative%Difference 888% <br /> MS/MSD Batch# TPHDW-4250 <br /> NIS %Recovery See Nate <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 MS/MSD's are advisory only and are not used to accept or <br />' reject batch results <br /> t <br /> ANALYST APPROVED BY <br /> . Clan J Cone J es C Phillips <br />' nviroomental Lab Director <br />