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Soil Vapor Sampling SOP Page 4 of 11 <br /> Stantec Rev. 1.0 Apr 2019 <br /> • Stainless steel vapor implants <br /> • Portland cement or non-VOC caulking material <br /> • Three-way stop cock valves <br /> • One-liter Summa TM canisters <br /> • Stainless steel trowels, putty knives or similar soil working tool <br /> • Waterproof marking pens <br /> • Soil gas sample data forms/clip board <br /> • Nitrile gloves, or other specified chemical resistant gloves <br /> • Work gloves <br /> • Camera <br /> • Personal safety gear (hard hat, steel-toed boots, ear plugs, safety glasses, etc.). <br /> 6.0 SUB-SLAB VAPOR IMPLANT INSTALLATION <br /> Depending on the regulatory agency or individual client requirements sub-slab soil vapor <br /> sampling point installation may be completed as follows. <br /> Hand-constructed probes <br /> • Ensure that all sub-slab utility locations (public and private) are marked prior to <br /> installation; <br /> • Using a commercial rotary hammer drill, a small diameter hole (approximately 1-inch) <br /> will be advanced approximately 2 inches into the slab. A smaller diameter hole (1/2 to <br /> 3/4-inch) will then be drilled through the remainder of the slab and extended <br /> approximately 3 inches into the sub-slab material. Care will be taken during <br /> advancement of the bit to avoid creating cracks in the surrounding slab. Dust and <br /> loose cuttings generated during drilling will be collected using a small hand broom and <br /> dustpan. A vacuum may be used to remove concrete and dust but in no event shall the <br /> vacuum inlet hose be placed directly over the borehole; <br /> • A stainless-steel soil vapor probe fitted with a short length of 1/4-inch outer diameter <br /> Teflon tubing, will be inserted and centered into the bore hole; <br /> • Since movement of the tubing can create an annulus for entrance of ambient air into the <br /> sample train, measures will be taken to ensure that the tubing is immobilized. This <br /> includes the application of quick-dry Portland cement at the surface and a non-VOC <br /> caulking (e.g. EcoSafe). The temporary sub-slab implant will be completed with a tubing <br /> cap or ball valve fitted with an end cap and allowed to harden and equilibrate a minimum <br /> of 30 minutes if temperature and humidity are adequate to completely cure bentonite <br /> and cement grout. In most cases it is recommended that samples not be collected for 18 <br /> hours to ensure that an adequate surface seal has formed. <br /> Vapor PinT°" Installation <br /> Vapor PinsTm distributed by Cox-Colvin offer a simplified probe installation and are suited for <br /> temporary or semi-permanent probes. Basically, the probe assembly is fitted with the <br /> THIS INFORMATION FOR AUTHORIZED COMPANY USE ONLY <br /> STANTEC CONSULTING <br />