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i 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 TPN-Diesel <br /> of Northern California Reference Number 1151 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 6 19-97 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 6 20 97 <br /> Attn Tim Cuellar Reported 6-24 97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH Diesel <br /> Spike Concentration 50 <br /> Units mg/kg <br /> LCS Batch # TPHD 6197 <br /> LCS % Recovery 103% <br /> Control Limits 60-130 % <br /> MS/MSD Batch # TPHD 6197 <br /> MS % Recovery NA' <br /> MSD % Recovery NA <br /> Relative % Difference NA <br />' •Matrix used for Spikes interfered with spiking solution <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 limas and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> i <br /> ANALYST APPROVED BY <br /> C! J one Jam C P cps <br /> EXVironrnental Lab Director <br /> i <br /> i <br />