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. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate#1-2480 Fax: (209)3841507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method:TPH-Diesel <br /> of Northern California Reference Number:4392 Instrument ID:HP-GC1 <br /> 837 Shaw Road Matrix: Sail Prepared: 01-29-02 <br /> Stockton, CA 95215 Analyst:Clari Cone Analyzed: 01-31-02 <br /> Attn:Tim Cuellar Reported: 02-08-02 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration: 5.0 <br /> ' units: mg/kg <br /> LCS Batch#: TPHDS-1292 <br /> LCS%Recovery: 78.8% <br /> ' Control Limits: 60-130% <br /> ' MSIMSD Batch#: TPHDS-1292 <br /> MS% Recovery: 104% <br /> ' MSD%Recovery: 79.8% <br /> Relative%Difference: 23.7% <br />' Please Note: <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 OC 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 /> Clad4- Ja e . Phillips <br /> boratory Director <br />