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EXCELCHEM <br /> ENVIRONMENTAL LABS <br /> 500 Giuseppe Court, Suite 9 0 <br /> Roseville, CA 95678 <br /> Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br /> QA/QC REPORT <br /> Attention: Mr. Gary Barker Sulfate Analyzed: 04-14-97 <br /> Horizon Environmental Nitrite-N Analyzed: 04-06-97 <br /> 5011 Golden Foothill Pkwy, Ste 7 Nitrate-N Analyzed: 04-06-97 <br /> El Dorado Hills , CA 95762 Iron Anlayzed: 04-10-97 <br /> Calcium Carbonate Analyed: 04-10-97 <br /> Project : 3001.1 l/Discovery Chevrolet Matrix: Nater <br /> Calcium <br /> SULFATE Nitrite-N Nitrate-N Iron Carbonate <br /> %REC %REC %REC %REC %REC <br /> PERCENT RECOVERIES <br /> Matrix Spike 113% 100% 112% 97% 101% <br /> Matrix Spike Duplicate 107% 100% 112% 96% 99% <br /> 04-16-97 <br /> ab ratory Representative Date Reported <br /> EXCELCHEKI ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Certifitafion No.1760) <br />