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• CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br /> Certificate No 2480 Fax (209)384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Rainwater Car Wash Method TPH-Diesel <br /> of Northern California Reference Number 5220(1-15, 36) Instrument ID HP-GC1 <br /> 837 Shaw Road Matnx Water Extracted 11-15-02 <br /> Stockton, CA 95295 Analyst Jim Phillips Analyzed 11-18-02 <br /> Attn Tim Cuellar Reported 11-26-02 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units uglL <br /> LCS Batch# TPHDW-N152 <br /> LCSA%Recovery 930% <br /> LCSB%Recovery 813% <br /> ' . Control Limits 55-130% <br /> Relative%Difference 134% <br /> I <br /> MS/MSD Batch# TPHDW-N152 <br /> MS %Recovery See Note <br /> MSD%Recovery See Note <br /> ' Relative%Difference See Note <br /> 1 <br /> ' Note Insufficient sample material to prepare MSIMSD 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 /> ' ANALYST Lam' APPROVED B " tL r <br /> Clan J Cone gaboratory <br /> M SC Phrtlt <br /> Director <br /> i <br /> ' I <br />