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EXC ECHEM <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: 00811/Stockton Unified School District <br />TPHd <br />PPM <br />Reporting Limit: 1.0 <br />QA/QC PARAMETER <br />Matrix Blank <br />PERCENT RECOVERIES <br />121-07 <br />Matrix Spike 89% <br />Matrix Spike Duplicate 84% <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 />01-06-97 <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 />(Lab �atorypresentative <br />01-07-97 <br />Date Reported <br />EXCELCI IEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br />DEPARTMENT OF HE 4,LTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br />(Certification No. 1760, 2119) <br />