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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 233a Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate No 2480 Fax (209)384-1507 <br /> I <br /> Advanced GeoEnvironmental, Inc Client Protect ID Rainwater Car Wash Method TPH-Diesel <br /> 1 of Northern CaliforniaM Reference Number 4987 Instrument ID HP-GC1 <br /> jl 837 Shaw Road Matrix Water Extracted 08-22-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 08-26-02 <br /> Attn Tim Cuellar Reported 08-28-02 <br /> 1 m� <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> 1 Spike Concentration 250 <br /> u <br /> Units ug/L I <br /> LCS Batch# TPHDW-8222 <br /> LCSA%Recovery 103% ! <br /> LCSB%Recovery 106% <br /> Control Limits 55-130% <br /> Relative%Difference 31% <br /> MS/MSD Batch# TPHDW-8222 <br /> MS %Recovery 000% <br /> I� MSD% Recovery 000% <br /> Relative%Difference 000% <br /> ! <br /> ! <br /> i <br /> I� Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate I <br /> The LCS (Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and j <br /> analyzed using the same reagents,preparation and analytical methods employed for the samples The LCS%recovery is used for validation <br /> J 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 /> 1�l <br /> IANALYST APPROVED BY <br /> Clary J Cone Ja s dlrps <br /> L oratory Director <br />