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Passive Soil Gas and Subslab Installation and Retrieval <br /> Standard Operating Procedure (SOP) <br /> Sampling Depth: 12-36 inches <br /> Soil Vapor Well Installation in Soil or Uncovered Surfaces: <br /> Drill a 1-inch diameter hole into the soil to desired depth. The ��-- <br /> �+; <br /> following figure illustrates it is important to get beneath the =__ ___ .4 . <br /> top soil layer to the underlying sediments below. If sample <br /> placement depth is not extended to 3ft or deeper, use a ''/z- { <br /> inch to 1-inch diameter drill bit to extend the hole to a three- <br /> to five-foot depth, as desired, to create a high permeability <br /> pathway beneath the sampler. Place 12-inch aluminum pipe . <br /> provided in the BeSure Sample Collection Kit OR longer f- <br /> inch PVC pipe (i.e. Soil Vapor Well) cut to desired length <br /> r. <br /> into the hole and insert completely. Use a tapping dowel and <br /> hammer to push pipe a '/2 to 1-inch below grade. �,,,.. <br /> Lod <br /> 1-1.5 inches Concrete seal min. 1/4-inch thickness <br /> Ground surface / Flush with grade <br /> •/ Top soil or grass <br /> Aluminum foil <br /> Blank casing <br /> 1 -inch diameter <br /> Schedule 40 PVC or aluminum <br /> Subsurface Depth: min 12-in (18cm). No max depth <br /> soil <br /> OPTIONAL <br /> For sample depths less than 36-in (1 m), <br /> advance a 1/2-inch to 1.0 inch drill hole <br /> to a min. depth of 1 meter(36 inches) <br /> Page 3 of 8 <br />