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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Seances 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> ' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnviron mental, Inc Client Project ID Rainwater Car Wash Method TPH-Diesel <br /> of Northern California Reference Number 5103 Instrument ID HP-GC1 <br /> 837 Shaw Road Matrix Water Extracted 10-01 02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 10-02-02 <br /> Attn Tim Cuellar Reported 10-10-02 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units ug/L <br /> ' LCS Batch# TPHDW-0012 <br /> LCSA%Recovery 124% <br /> ' LCSB%Recovery 117% <br /> Control Limits 55-130% <br /> Relative%Difference 632% <br /> I <br /> ' MS/MSD Batch# TPHDW-0012 <br /> MS%Recovery See Note <br /> MSD %Recovery See Note <br /> Relative%Difference See Mote <br /> I <br /> Note Insufficient sample material to prepare MSIMSD samples LCS samples prepared in duplicate <br /> 1 <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 acceptor <br /> reject batch results <br /> ' ANALYST APPROVED BY <br /> Clan J one Jam Phillips <br /> L oratory Director <br />