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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 TPH-Diesel <br /> ' of Northern California Reference Number 5494 Instrument ID HP-GC1 <br /> 837 Shaw Road Matrix Water Extracted 02-28-03 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 03-04-03 <br /> Attn Tim Cuellar Reported 03-05-03 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> I <br /> Units ug/L <br /> I <br /> LCS Batch# TPHDW-2283 <br /> LCSA%Recovery 922% <br /> LCSB%Recovery 773% <br /> Control Limits 55-130% <br /> Relative% Difference 177% <br /> MSlMSD Batch# TPHDW-2283 <br /> MS%Recovery See Note <br /> MSD%Recovery See Note <br /> Relative% Difference See Note <br /> i <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 GC 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 /> 0/ , ""�Z <br /> Clan J Cone Jame^ PtWps <br /> La story Director <br />