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r 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 this project. 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. 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 probes rods and sampling for soil gas investigation 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 in good working condition, 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 Geoprobe® direct- push sampling rig or by an electric hammer ahead of as many 1.0-inches outside until it is advanced to the proposed diameter OD stainless steel robe rods u p p ( ) p target depth. The PRT adapter will be fitted at the end of a selected length of an inert 118 inch OD Nylaflow tubing approximately 5 feet longer than the embedded length of probe rods. The Nylaflow tubing will be fitted inside a protective, disposable, outer t/4 inch OD Teflon or polyethylene tubing and will be threaded down the center of the probe rods and connected to a sampling port just above the expandable (drop off) tip. Project No.7076.15 B - 1 HORIZON ENVIRONMENTAL INC.