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V HORIZON ENVIRONMENTAL INC. FIELD METHODS AND PROCEDURES SOIL GAS INVESTIGATION HYDRAULIC OR MANUALLY- DRIVEN SAMPLING PROBES The following section describes field methods and procedures that will be completed by Horizon Environmental Inc. (Horizon) personnel in .performance of soil gas investigations. 1.0 HEALTH AND SAFETY PLAN Fieldwork performed by Horizon and subcontractors at the site will be conducted according to guidelines established in a Site Health and Safety Plan (SHSP). The SHSP is a document that describes the hazards that may be encountered in the field and specifies protective equipment, work procedures,. and emergency information. A copy of the SHSP will be at the site and available for reference by appropriate parties during work at the site. The SHSP shall comply with health and safety guidelines in the Horizon Health and Safety Program Handbook. 2.0 UNDERGROUND UTILITY SURVEY Prior to commencement of work on site, Horizon will contact Underground Service Alert (USA) to set up an underground utility survey. USA contacts the owners of the various utilities in the vicinity of the site to have the utility owners mark the locations of their underground utilities. Work associated with borings and monitoring well installations will be preceded by manual hand augering to avoid contact with underground utilities. 3.0 SOIL GAS SAMPLING PROTOCOL Installation of probe rods and sampling for soil gas investigations will be performed under the supervision of. a Horizon geologist. All metal and non-metal tools and parts utilized during probe installation and soil gas sampling will be decontaminated or new, dedicated parts. A Post -Run Tubing (PRT) system consisting of a PRT expendable point holder, a PRT adapter and PRT Teflon or Nylaflow tubing will be used to insert, seal and convey soil gas from the target depth to the surface. The PRT expendable point holder will be driven into the ground using a truck -mounted direct -push sampling rig or by an electric hammer ahead of a one -inch outside diameter (OD) stainless steel probe rod until the PRT is advanced to the proposed target depth. The PRT adapter will be fitted at the end of an inert 118 -inch OD Nylaflow tubing approximately five feet longer than the embedded length of the probe rods. The Nylaflow tubing will be fitted inside a protective, disposable, 114- inch OD Teflon or polyethylene tubing, and will be fed down the inside of the probe rods and connected to the expendable (drop-off) drive point. A 50 -cubic centimeter (cc) syringe will be connected to the 1/8 -inch Nylaflow tubing at the surface via an on/off valve. Prior to opening the vapor sampling port, a