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' CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate No 2079 Fax (209)384-1507 <br /> Advanced GeoEnvrronmental, Inc Client Project ID California Fuels Method TPH-Diesel <br />' of Northern California Reference Number 3017 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 5-31-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 6-2-00 <br /> Attn Tim Cuellar Reported 6-8-00 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Units uglL <br /> LCS Batch# TPHDW-5310 <br /> LCSA% Recovery 826% <br /> LCSB%Recovery 818% <br />' Control Limits 55-130% <br /> Relative%Difference 1 01% <br />' MS/MSD Batch# TPHDW-5310 <br /> MS%Recovery See Note <br />' MSO% Recovery See Note <br />' Relative%Difference See Note <br />' Note Insufficient sample material to prepare MSIMSD 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 analvtes 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 /> 1 <br /> ANALYST CLLI, APPROVED BY dZI <br /> Clan J Cone Ja C Phr111ps <br /> vrronmental Lab Director <br />