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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 GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method TPN-Diesel <br /> ' of Northern California Reference Number 5218 Instrument ID HP-GC1 <br /> 837 Shaw Road Matrix Water Extracted 11-14-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 11-17-02 <br /> Attn Tim Cuellar Reported 11-26-02 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> ' Units ug/L <br /> LCS Batch# TPHDW-N142 <br /> ' LCSA%Recovery 700% <br /> LCSI3%Recovery 703% <br /> ' Control Limits 55-130% <br /> Relative%Difference 0395% <br /> MS/MSD Batch# TPHDW-N142 <br /> t 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 /> 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 acceptor <br /> reject batch results <br /> , <br /> ' ANALYST APPROVED BY <br /> ClAq4 Cone i Ja hl l f <br /> f f <br /> La oratory Director <br /> f f� <br /> if <br /> f <br />