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EXCEL HEM ENVIRONMENTAL LABS 500 Giuseppe Court, Suite 9 Roseville, CA 95678 Phone#: (916) 773-3664 Fax#: (916) 773-4784 ANALYSIS REPORT Attention: Mr. Noel Lerner Date Sampled: Helmick & Lerner, Inc. Date Received: 1620 Executive Court MTBE Analyzed: Sacramento, CA 95864 BTEX Analyzed: TPHg Analyzed: Project: 00811/Stockton Unified School District Matrix: 01-03-97 01-03-97 01-06-97 01-06-97 01-06-97 Ethyl- Total MTBE Benzene Toluene benzene Xylenes TPHg PPM PPM PPM PPM PPM PPM ReDortine Limit: 0.005 0.005 0.005 0.005 0.005 1.0 SAMPLE Laboratory Identification: 0605-0608 ND ND ND ND ND ND 50197014-017 0609-0611 ND ND ND ND ND ND 50197018-020 0633 ND ND ND ND ND ND S0197042 0634 ND ND ND ND ND ND 50197043 0636 ND ND ND ND ND ND S0197045 0637 ND ND ND ND ND ND S0197046 Soil ppm = Parts per million = mg/Kg = milligram per Kilogram ND = Not detected. Compound(s) may be present at concentrations below the reporting limit. ANALYTICAL PROCEDURES 1NITBE-- Methyl tert-Butyl Ether is measured by extraction using EPA Method 5030 followed by analysis using EPA Method 8020 which utilizes a gas chromatograph (GC) equipped with a photoionization detector (PID). BTEX-- Benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) are measured by extraction using EPA Method 5030 followed by analysis using EPA Method 8020 which utilizes a gas chromatograph (GC) equipped with a photoionization detector (PID). TPHg—Total petroleum hydrocarbons as gasoline (low to medium boiling points) are measured by extraction using EPA Method 5030, followed by modified EPA Method 8015 which utilizes a GC equipped with a FID. 01-07-97 ab atory resentative Date Reported EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY (Certification No. 1760, 2119)