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' Emergency Remediation- 2480 Tracy Blvd., Tracy, CA. • Page 4 Following sample recovery, each sample tube was cleaned externally, its ends covered with aluminum foil and closed with tightly-fitting plastic caps. The caps were secured with adhesiveless tape. Each sample tube was then labeled for identification, entered into chain- of-custody control, and packed on chemical ice for transport to Chromalab Inc.'s laboratory in Pleasanton, California for analysis. Each soil sample submitted to the laboratory was analyzed for the following suite of analytes. Analyte Method of Analysis Total Petroleum Hydrocarbons EPA Method 5030/8015 (as Gasoline) Benzene EPA Method 8020 Toluene EPA Method 8020 Ethyl Benzene EPA Method 8020 Total Xylene Isomers EPA Method 8020 Methyltributilethylene EPA Method 8020 Chromalab's laboratory is licensed by the California Environmental Protection Agency, Department of Health Services (DHS)to perform the cited analyses. Benzene, toluene, ethyl benzene and xylene isomers are commonly referred to as the BTEX compounds. Methyltributilethylene (MTBE) is an oxygenator that reduces noxious vehicle emissions. It has been required to be included as an additive to gasoline sold in California since the winter season of 1992. A sampling port, installed in the riser from the existing basement-dewatering pump, was used to recover a sample of groundwater by opening the port and directing the port tubing into a pair of clean, laboratory-supplied sample vials so that the vials were completely ' filled and no head space was present after the vials were tightly closed. The vials were then labeled for identification, entered into chain-of-custody control, and shipped to Chromalab's laboratory in the same cooler used to transport the two soil samples. This ' first sample of groundwater was designated WATER 1. At the laboratory, the groundwater sample was analyzed for the same suite of analytes as are listed above for the soil samples. The recovery and preparation of the soil and groundwater samples described above was performed in the presence of Ms. Linda Turkatte, the representative of the SJCPHS.