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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 2480 Fax (209)384-1507 <br /> Advanced GeoEnvlronmental Inc Client Project ID Rainwater Car Wash Method TPH-Dieset <br /> ' of Northern California Reference Number 5420 Instrument ID HP-GC1 <br /> 837 Shaw Road Matrix Water Extracted 02-03-03 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 02-06-03 <br /> Attn Tim Cuellar Reported 02-11-03 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> 11 <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units ug/L <br /> ' LCS Batch# TPHDW-2033 <br /> ' LCSA% Recovery 885% <br /> LCSB% Recovery 753% <br /> Control Limits 55-130 <br /> Relative%Difference 162% <br /> ' MS/MSD Batch# TPHDW-2033 <br /> MS %Recovery See Note <br /> ' MSD%Recovery See Note <br /> Relative%Difference See Note <br /> 1 <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 /> 1 <br /> f <br /> ' ANALYST APPROVED BY <br /> Clan Con Jame P ps <br /> Lab story Director <br /> i <br />