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I <br />' CASTLE ANALYTICAL. CAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (2091 384-2930 <br />' Fax (209) 384-1507 <br /> Certificate #2079 <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 6-23 97 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 6-24 97 <br /> Attn Tim Cuellar Reported 6-24-97 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE TPH-Diesel <br /> 1 <br /> Spike Concentration 50 <br />' Units mg/kg <br /> LCS Batch # TPHD 6237 <br /> 1 LCS % Recovery 79 2% <br /> Control limits 60-130 % <br /> lie MSIMSD Batch # TPHD-6237 <br />' MS % Recovery 67 5% <br /> MSD % Recovery 61 6% <br />' Relative % Difference 7 67%fl <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 /> 1 ANALYST APPROVED BY <br /> Gan J Cone mes Phrllrps <br /> Environmental Lab Director <br /> • <br /> 1 <br />