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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH-Dresel <br /> of Northern California Reference Number 3172 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 8-24-00 <br /> Stockton,CA 95205 Analyst Clair Cone Analyzed 8-29-00 <br /> Attn Tim Cuellar Reported 9-7-00 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE TPM-Diesel <br /> Spike Concentration 500 <br />' Units mg/kg <br /> LCS Batch# TPHDS-8240 <br />' LCS%Recovery 877% <br /> Control Limits 60-130% <br /> lie MS/MSD Batch# TPHDS-8240 <br /> MS%Recovery 741% <br /> MSD%Recovery 656% <br /> Relative%Difference 800% <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 QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clary one Ja e C hllhps <br /> nowronmental Lab Director <br /> I <br />