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PRKWOH W p TC] CERTIFICATE OFANALYSIS <br /> Analytical Laboratory <br /> 3935 N.Coronado Ave,Stockton CA.95204 Phone:(209)477-8105 <br /> Associated Tractor Service,Inc Project Number: Clean Up <br /> 1323 W.Chater Way Project Name: Clean Up Work Order No.: <br /> Stockton,CA 95206 <br /> Project Manager. Larry Borell <br /> Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Reporting Spike Source <br /> Analyte Result Limit Units Level Result %REC RPD Notes <br /> Reference(AC00904-SRMI) <br /> Silver 9.30 0.0500 mg/kg 8.90 104 <br /> Thallium 0.444 0.100 0.422 105 <br /> Zinc 106 0.100 90.5 118 <br /> (�4/4w� <br /> Approved By <br /> Precision Enviro-Tech. — California D.O.H.S.Cert.#2387 <br /> Page 8 of 12 <br />