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. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (2091 384-2930 <br /> Certificate#2079 Fax (209) 384-1507 <br /> Advanced Geofnvironmental, Inc Client Project ID Cal Fuels Method TPH-Dresel <br /> of Northern California Reference Number 1316 Instrument ID HP GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 11-5-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 11-6-97 <br /> Attn Tim Cuellar Reported 11-12-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 50 <br /> Units mg/kg <br /> LCS Batch # TPHD N057 <br /> LCS % Recovery 927% <br /> Control Limits 60-130 % <br /> MSIMSD Batch # TPHD-N057 <br /> MS % Recovery 82 7% <br /> MSD % Recovery 893% <br /> Relative % Difference 667% <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 MS/MSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST (Iplucoal <br /> APPROVED BY <br /> Clan J Cone Japes hfl fps <br /> nwronmental Lab Director <br />