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Work Plan—PEA Page 8 Former Haley Flying Service GPE Project 474.2 by a possible past release. As shown on the detailed site map (Figure 3), a total of 14 targeted shallow soil sample points have been selected. The map also shows the proposed sample ID designations. The numbering convention described above for shallow screening samples will be carried through to these targeted samples. One of the samples (S-IOB) will also be tested for the possible presence of VOC's and petroleum hydrocarbons that may have been released from a surface spill from two drums of waste liquid documented by the San Joaquin County Environmental Health Department Groundwater Samples The single installation believed most likely to have impacted the soil is the area of the washout pit. A groundwater sample will be collected from points near each end of the washout pit. Geo-Probe soil borings (designated B-1 and B-2) will be installed and advanced to a depth sufficient to penetrate the groundwater surface, and a sample of the shallow groundwater will be collected from each of the two borings. 2.1.2 Shallow Soil Sampling and Analysis The shallow soil samples will be collected using hand auger soil boring tools. Where needed, asphalt or other surface obstructions will be penetrated by use of a small roto-hammer. Once native soil is encountered, the first 6-inches of soil will be collected as a discreet sample, and a second discreet sample collected from 6 to 12 inches will be collected as a second sample. These two, stacked samples will be collected for the purpose of obtaining information regarding the vertical distribution of any contaminants that may be detected. In this way, two discreet samples will be collected from each sample point. The samples will be collected by use of a slide-hammer driven soil-sampling tool equipped with a new, 2-inch diameter, 6-inch long brass or stainless steel sample sleeves. In cases where dry, loose soil prevents retention in the soil sampler, sample material may be collected directly from the auger bucket. Excluding the single VOC sample, the expected contaminants have low volatility; and this sample method should not result in a material degradation of sample quality. One sample will be collected for VOC testing. In order to assure adequate preservation of volatile compounds, an Encore sampling device will be inserted into the sample sleeve and the resulting sample will be kept separate from the remainder of the sample material. Upon retrieval, each sample tube will be sealed with aluminum foil (or Teflon patches) and plastic end-caps. The caps will be secured with duct tape, and the sample labeled. The labeling information will include the sample identification number as well as the date and time of collection (See Section 2.1.5 for additional details). After labeling, the samples will be placed in a cooler chilled with water ice pending transport to the analytical laboratory under chain-of-custody protocol. Chain of custody (CofQ forms are documents used to track the handling of samples. All dates, times, persons and companies handling the samples are listed from the time the sample is collected to its ultimate disposal. Sampling equipment will be double washed using a non-phosphate detergent after every use and rinsed with de-ionized water. 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, Ca 95356 Fax: (209) 569-0295