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Passive Soil Gas and Subslab Installation and Retrieval <br /> Standard Operating Procedure (SOP) <br /> Drilling and Installation of Passive Soil Vapor Well <br /> (by surface type) <br /> At each survey point, clear vegetation as necessary and, using a hammer drill and drill bit (or <br /> comparable equipment), create a 1"- to 1'/z"-diameter hole <br /> Sampling Depth: 12-36 inches <br /> Subslab or Asphalt Covered Passive Soil Vapor Well Installation: <br /> Drill a 1'/2" diameter hole through the slab and into the <br /> underlying soil or fill matrix. Recommend a minimum of 6 Aft <br /> inches depth. If sample placement depth is not extended to 3ft <br /> or deeper, use a 'i/2" to 1" diameter drill bit to extend the hole <br /> i <br /> to a three- to five-foot depth, as desired, to create ahigh <br /> permeability pathway beneath the sampler. Place 12" <br /> aluminum pipe provided in the BeSure Sample Collection Kit <br /> or longer 1"PVC pipe (i.e. Soil Vapor Well) cut to desired - <br /> length into the hole and insert completely. Use a tapping <br /> dowel and hammer to push pipe a 'i/2" to 1"below grade. <br /> 1-1.5 inches Concrete seal min. 1/4-inch thickness <br /> Ground surface Flush with grade <br /> Asphalt or Aluminum foil <br /> Concrete slab <br /> Blank casing <br /> 1 -inch diameter <br /> Schedule 40 PVC or aluminum <br /> Depth: min 12-in (18cm). No max depth <br /> Subsurface <br /> soil ---------------- <br /> RECOMMENDED <br /> For sample depths less than 36-in (1 m), <br /> advance 1/2-inch to 1.0 inch drill hole to a <br /> min. depth of 36-in (1 m) <br /> Page 2 of 8 <br />