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1 <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 GeoEnvironmental, Inc Clrent Project ID Rainwater Car Wash Method TPH-Diesel <br /> ' of Northern California Reference Number 3402 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 12-28-00 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 12-29-00 <br /> Attn Tim Cuellar y <br /> ' Reported 1-3-01 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units uglL 3 <br /> LCS Batch# TPHDW-0280 <br /> ' LCSA% Recovery 91 6% <br /> LCSB % Recovery 906% <br /> '• Control Limits 55-130% <br /> RpIAhVP%difference 1 10:5 <br /> ' MS/MSD Batch# TPHDW-D280 <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 /> TheLCSLCS(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 MSlMSD's are advisory only and are not used to accept or <br /> ' reject batch results <br /> ANALYST APPROVED BY <br /> Clair J Cone Jam Phillips <br /> ' lronmental Lab Director <br />