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E CELCHEM <br /> rj ENVIRONMENTAL LABS <br /> 500 Giuseppe Court, Suite 9 <br /> Roseville, CA 95678 <br /> Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br /> I <br /> I <br /> QA/QC REPORT <br /> --- Attention: Mr. Noel Lerner Date Analyzed: 12-23-96 <br /> Helmick&Lerner, Inc. Matrix: Soil <br /> 1620 Executive Court <br /> Sacramento, CA 95864 <br /> Project: Stockton Unified School District <br /> -' Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPM PPM PPM PPM <br /> Re ortin Liniit: 0.005 0.005 0.005 0.005 <br /> is QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Laboratory Control Spike 85% 86% 87% 87% <br /> o a o a <br /> Laboratory Control Spike 89% 90/0 90/0 91/o <br /> i Duplicate <br /> ppm=parts per million=mg/Kg—milligram per kilogram <br /> ND —Not detected. Compound(s)may be present at concentrations below the reporting limit. <br /> =.� All surrogate recoveries were within 30%of target values. <br /> Spikes&Spine Duplicates were each spiked with 250 ng BTEX standard. <br /> ANALYTICAL PROCEDURES <br /> BTEX--Benzene,toluene,ethylbenzene,and total xylene isomers(BTEX)are measured by extraction using EPA Method 5030 followed by analysis <br /> using EPA Method 8020 which utilizes a gas chromatograph(GC)equipped with a photoionization detector(PID). <br /> I <br /> 01-06-97 <br /> ab ratory Representative Date Reported <br /> -I <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THESCATE OF CALIFORNIA <br /> DEPARTMENT OF HLOLTH 5ER410E5 A5 A HAZARDOUS WASTETESTING LABORATORY <br /> (Certification No.1760,2119) <br /> f <br />