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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 />TPHd <br />PPM <br />Reporting Limit: 1.0 <br />QA/QC PARAMETER <br />Matrix Blank ND <br />PERCENT RECOVERIES <br />Matrix Spike 75% <br />Matrix Spike Duplicate 77% <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 />Spikes & Spike Duplicates were each spiked with 5000 ug of diesel standard. <br />ANALYTICAL PROCEDURES <br />01-03-96 <br />Soil <br />TPHd—Total petroleum hydrocarbons as diesel (high boiling points) are measured by extraction using EPA Method 3550, followed by modified EPA <br />Method 8015, with direct sample injection into a GC equipped with an FID. <br />Lao tory Repr entative <br />01-06-97 <br />Date Reported <br />F.XCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br />DEPARTMEN r OF HEALTH SERVICES ASA HAZARDOUS wASTETESI ING LABORATORY <br />(Certification No. 1760, 2119) <br />