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A4OM • Clean out the dust using a shop vacuum. Note: Do not use a shop vacuum to clean out the dust from drilling if the hole extends all the way through the sub-slab. • Continue drilling down using a 5/16"diameter concrete bit to below the slab. • Use the drill bit to measure the thickness of the slab and record the value. Note: If the slab is very thick(e.g., 18"),the 5/16"drill bit may not be long enough to reach the bottom of the slab. In this case, use a larger, longer drill bit for the entire length of the slab. • Hand auger to 5 feet below slab to install vapor probe. Vapor Pin® Installation: Drill down into the slab approximately 1 to 2 inches using a rotary hammer drill with a 1'/2-inch diameter drill bit. • Clean out the dust using a shop vacuum. Note: Do not use a shop vacuum to clean out the dust from drilling if the hole extends all the way through the sub-slab. • Continue drilling down using a 5/8"diameter concrete bit to below the slab. • Use the drill bit to measure the thickness of the slab and record the value. • Assemble the Vapor Pin® sampling device and Vapor Pin® sleeve. • Place the lower end of the Vapor Pin sampling device assembly into the drilled hole. Place the small hole located in the handle of the Installation/Extraction tool, over the Vapor Pin®to protect the barb fitting and tap the Vapor Pin® into place using a dead blow hammer. Make sure the Installation/Extraction tool is aligned parallel to the Vapor Pin® to avoid damaging the barb. • During installation,the Vapor Pin® sleeve may form a slight bulge between the slab and the Vapor Pin® sampling device shoulder. • Place the Vapor Pin® cap on the Vapor Pin® to prevent vapor loss prior to sampling. • Allow 20 minutes or more for the sub-slab soil-gas conditions to re-equilibrate prior to sampling. 4.3 SEALING,MARKING,RECORDKEEPING Sub-slab monitoring probe installation use modeling clay to seal the hole until the sampling train configuration is set(Step 4 under Sampling Procedures below). Label the SSMP with indelible marker or paint pen on removable duct tape. Record all measurements in the project logbook, including: • Slab thickness; • Borehole diameter; and • Time when clay seal was installed