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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Wednesday,April 20,2005 <br /> Attention: Doug Heard <br /> Kleinfelder, Inc. Report Page 14 of 26 <br /> 2825 Myrtle St. <br /> Stockton, CA 95205 <br /> Volatile Organic Compounds by EPA Method 82608-Quality Control <br /> Precision Enviro-Tech <br /> Reporting Spike Source %REC RPD <br /> An Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AD51911-Volatiles <br /> Matrix Spike Dup(AD51911-MSDI) Source:5041907-01 Prepared&Analyzed: 19-Apr-05 <br /> Benzene 16.0 2.00 ug/kg 20.0 ND 80 70-124 2 15 <br /> Chlorobenzene 17.0 2.00 20.0 ND 85 70-117 2 15 <br /> I,1-Dichloroethene 16.2 2.00 20.0 ND 81 70-133 3 15 <br /> Toluene 16.0 2.00 20.0 ND 80 70-122 2 15 <br /> Trichloroethene 18.0 2.00 20.0 ND 90 70-117 2 15 <br /> Surrogate:DibromoJluoromethane 50.0 50.0 100 86-118 <br /> Surrogate:Toluene-d8 47.8 50.0 96 88-110 <br /> Surrogate:4-Bromofluorobenzene 51.1 50.0 102 86-115 <br /> mg,L=milligmms per Liter=ppm DLR=Detection Limit for purpose of Reporting. ' <br /> ug/L=microgmms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> (�5/Otr� <br /> Jonathan Le,Laboratory Director <br /> 7743.N. iVest Lane. Suite B2 Stockton C.A. 952.10 phone: (209) 477-8.10.5 Fax: (20.9) 477-8148 <br />