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I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Wanton, CA 95388 Phone (209) 384 2930 <br /> ICertificate #2079 Fax (209) 384 1507 <br /> Advanced GeoEnvironmental, Inc Client Protect ID Joe's Truck Stop Method TPH-Dieset <br />' of Northern California Reference Number 990 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 1-16-97 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 1-16-97 <br /> Attn Kevin M`Grbben Reported 1-17-97 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 5 0 <br />' Units mglkg <br /> LCS Batch # TPHD 1 167 <br /> LCS % Recovery 866% <br /> Control Limits 60130 % <br /> MS/MSD Batch # TPHD 1167 <br /> MS % Recovery 86 7% <br />' MSD % Recovery 76 7% <br /> Relative % Difference 104% <br /> 1 <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 /> refect batch results <br />' ANALYST APPROVED BY <br /> Clary J Cone i4fnes C Phl7ps <br /> Environmental Lab Director <br /> 1 <br /> 1 <br />