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ANALYTICAL RESULTS NEI/GTEL Client ID: CES06CES06 Total Petroleum Hydrocarbons By GC Login Number: W7030026 Project ID (number): 97715 Method: GC Project ID (name): CITY OF STOCKTON-TAFT/MODESTO/CA Matrix: Solids NEI/GTEL Sample Number W7030026.01 W7030026-02 W7030026.03 W7030026.04 Client ID 81.3.0 82.3.0 83.3.0 84.3.0 Date Sampled 02/28/97 02/28/97 02/28/97 02/28/97 Date Prepared 03/10/97 03/10/97 03/10/97 03/10/97 Date Analyzed 03/13/97 03/13/97 03/13/97 03/13/97 Dilution Factor 1.00 1.00 1.00 1.00 Reporting Analyte Limit Units Concentration Wet Weight TPH as Gas 10. mg/kg < 10. < 10. < 10. < 10. TPH as Mineral Spirits 10. mg/kg < 10. < 10. < 10. < 10. TPH as Diesel 10. mg/kg < 10, < 10. < 10. < 10.. TPH as Lubricating Oil 10. mg/kg < 10. < 10. < 10. < 10. Percent Solids -- h 77.3 77.31 75.1 78.7 Notes: Dilution Factor: Dilution factor indicates the adjustments made for sample dilution. GC: Extraction by EPA Method 3550 (sonication). ASTM Method 03328(modified) is used for qualitative identification of fuel patterns. The method has been modified to include quantitation by applying calibration and quality assurance guidelines outlined in "Test Methods for Evaluating Solid Waste. Physical/Chemical Methods". SW-846. Third Edition including promulgated Update 1. This method is equivalent to the California LUFT manual OHS method for diesel fuel. Lubricating oil can not be qualitatively identified by type of oil because of chromatographic likeness of different oil types. Due to non-volatility of certain oils, much of the oil present may not be quantified by this method. Quantitation obtained for lubricating oil by this method should. therefore, be treated as an estimate. This method quantifies lubricating oil against 10-W-30 standards. Due to potential loss of volatile components during sample preparation. quantitation of gasoline by this method should be considered an estimate. NEI/GTEL Wichita, KS W7030026 Page: 1