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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 <br /> Fax: (209)384-1507 <br />' Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method:TPH-Diesel <br /> of Northern California Reference Number:6566 Instrument ID: HP-GC1 <br /> 837 Shaw Road Matrix:Water Extracted:01-28-04 <br /> Stockton,CA 95215 Analyst: Jim Phillips Analyzed: 02-02-04 <br /> Attn:Tim Cuellar Reported:02-03-04 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> 1 <br /> Spike Concentration: 180 <br /> Units: ug/1- <br /> Batch <br /> g/LBatch#: TPHDW-1284 <br /> Method Blank: ND <br /> LCSA%Recovery: 99.7% <br />'0 LCSB % Recovery: 103% <br /> Control Limits: 55-130% <br />' Relative%Difference: 3.29% <br /> MS/MSD Batch#: TPHDW-1284 <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 analyticalmethods 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 accept or <br />' reject batch results. <br /> ANALYST: , APPROVED BY: <br /> Clari J. Cone Ja s C. hillips <br /> Ldboratory Director <br /> 1 <br />