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Environmental Laboratories_.. or. <br /> Working To Restore Nature <br /> QUALITY ASSURANCE/QUALITY CONTROL REPORT <br /> Attention: Greg Stahl Date Analyzed: 04-26-93 <br /> RESNA G.C.#: 2 <br /> 1710 Main Street Matrix: Water <br /> Escalon, California 95320 <br /> Project: 11020.OL, Project W0195.00 <br /> Western Stone Products, Tracy <br /> Ethyl Total <br /> Benzene Toluene Benzene Xylenes <br /> Ppb ppb _ ppb ppb <br /> Detection Limit: 0.5 0.5 0.5 0.5 <br /> Blank ND ND ND ND <br /> Standard 95 95 99 97 <br /> -:':- MS 104 110 190 108 <br /> MSD 103 110 110 106 <br /> RPD 0.97 0.00 0.00 1.87 <br /> Ppb=parrs per billion=ug/L=6cmgrama per liter <br /> ND=Not detected. Compound(s)may be present at concentrations below the detection limit <br /> NR=Analysis not requested. <br /> MS=Matrix Spike <br /> MSD=Matrix Spike Duplicate <br /> RPD=Relative Percent Difference <br /> Acceptable Range <br /> Standard 85-115% <br /> Blank ND <br /> MSIMSD 70-130% <br /> RPD Q5% <br /> &_LoLj May 5,1993 <br /> Laboratory Rep ntative Date Reported <br /> RESNA ENVIRONMENTAL LABORATORY IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Certification No.1211) <br /> 42501 Albrae Street• Fremont, CA 94538 9 Phone: (510) 623-0775 • (800) 247-5223 • FAX: (510) 651-0754 <br />