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Mr. Chris Dressel March 4,2014 Page 12 of 18 well screen will be exposed beneath the groundwater. The groundwater sample will be collected by using an inertial WaTerra pump. The pump consists of a riser tube with a one-way valve at the foot and a surface pumping mechanism. The valve allows water to enter the tubing as it is pushed downwards, and retains the water when the tube is pulled upwards again. The inertia of the water itself provides the force to carry it up to the surface whenever the tube is being pumped up and down. The water travels in a continuous column, with little disturbance, thus retaining volatiles. Laboratory-certified sampling containers will be filled (and preserved) in appropriate order. Generally, the most volatile parameters are containerized first. Groundwater samples that are to be analyzed for volatile parameters will be collected in 40 ml vials sealed with Teflon-lined lids. The samples will be placed into a cooler, packaged with ice to maintain a shipment temperature of approximately 4 degrees Centigrade, documented with a chain-of-custody form, sealed, and shipped overnight or hand-delivered to the analytical laboratory. The proposed Scope of Work for each area of concern is described in the following sections. I) Transformer Room #3 Two (2) soil probes will be advanced to a depth of the water table adjacent to the former subgrade transformer room where the concrete floor has been documented to be impacted with PCBs. According to Hull, the groundwater flow direction in the area is towards the St. Joseph River, or to the north-northeast. As a result, the soil probes are to be located as shown on Figure 3, immediately downgradient. Soil and/or ground water samples will be collected from each probe. 2) Chemical/Petroleum Releases from Historical Usage Four (4) probes will be advanced north of Buildings 112 and 84 and one (1) soil probe will be advanced to the south of Building 84 in the courtyard (see Figure 3). The soil probes will be advanced to the depth of the water table. Only groundwater samples will be collected from these borings unless there are field indications of a soil impact. 3)Former UST Location Four (4) probes will be advanced using the step-out procedure discussed in Chapter 3 of the Remediation Closure Guide. These probes will be advanced to the depth of the water table. Soil