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Passive Soil Gas and Subslab Installation and Retrieval <br /> Standard Operating Procedure (SOP) <br /> Equipment List <br /> 1. Appropriate PPE r <br /> 2. Beacon PSG sampling kit <br /> a. Standard Operating Procedure <br /> b. PSG Samplers e_ g_ <br /> c. Screened caps (in container) e <br /> d. Empty container for solid caps e <br /> e. *Aluminum soil vapor wells (12-inch) and pipe <br /> cutter(when requested) r B SURE <br /> f. Tools (wire cutter, pliers, dowel) - � <br /> g. Gauze for cleaning samplers <br /> h. Sampler bags and bubble wrap for labeling and return shipment <br /> i. Chain of Custody and Field Report form. <br /> 3. Hammer drill (recommendation available from Beacon) <br /> 4. Augur or Drill bits 1"-to 1%2"-diameter and 1/2"to 1" diameter drill bit. Lengths of drill <br /> bits vary by target depth (1 to 15 feet). For depths greater than 36 inches, 1.5 or 2 inch <br /> auger may be preferred. <br /> 5. Quick patch ready set cement, tray, trowel and water. <br /> Soil Gas Investigation Design, Spacing and Objectives <br /> Sample spacing: The selection of sampling points is strongly dependent upon the need for high <br /> resolution coverage and budget. General grid patterns with 50 to 100 feet centers are typical for <br /> reconnaissance work,while closer spaced, source area investigations and high-resolution <br /> sampling are accomplished 15 to 30 feet spacing (depending on site conditions). <br /> Collection depth: Passive soil gas applications are placed at shallow depths when sub-slab <br /> sampling is done (less than 12 inches), shallow depths of 12-36 inches when investigating sites <br /> and deeper depths of 5 feet bgs or more when adhering to regulatory guidance or based on site <br /> investigation objectives. The following installation procedures are provided for different depth <br /> applications/objectives. <br /> A two-person team can install approximately 5 0-100 samplers per day depending on surface <br /> cover, depth of drilling, and sample spacing. For retrieval, one person can retrieve approximately <br /> 50 samplers per day and patch holes for temporary sample locations. More if permanent soil <br /> vapor wells are utilized. <br /> Page 1 of 8 <br />