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EXCELCHEM <br />ENVIRONMENTAL LABS <br />500 Giuseppe Court, Suite 9 <br />Roseville, CA 95678 <br />Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br />QA/QC REPORT <br />Attention: Mr. Noel Lerner Date Analyzed: <br />Helmick & Lerner, Inc. Matrix: <br />1620 Executive Court <br />Sacramento, CA 95864 <br />Project: Stockton Unified School District <br />12-23-96 <br />Soil <br />Ethyl- Total <br />Benzene Toluene benzene Xylenes <br />PPM PPM PPM PPM <br />Reporting Limit- 0.005 0.005 0.005 0.005 <br />QA/QC PARAMETER <br />Matrix Blank <br />PERCENT RECOVERIES <br />ND ND ND ND <br />Laboratory Control Spike 85% 86% 87% 87% <br />Laboratory Control Spike 89% 90% 90% 91% <br />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 & Spike 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 />Itratory Representative <br />01-06-97 <br />Date Reported <br />EXCELCHEM EN VIRONME\IAL L\BS IS CERTIFIED BY THE STATE OF CALIFORNIA <br />DEPARTMENT OF HE,\I.TH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br />(CertffiC—on No. 1760, 2119) <br />