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Ll 4.03 BACKFILLING A The depth and length of the pea gravel sampling zones may be adjusted by the Engineer based on geologic data obtained during drilling. B Place backfill materials'in a controlled manner to avoid bridging, overfilling the boring, or damaging the probe pipes. C Periodically measure depths of pea gravel backfill from the existing grade level with a weighted measuring tape. D Measure the top of pea gravel depth of each pipe probe from surrounding grade with a weighted measuring tape in the presence of the EHD inspector and the Engineer. E Place the bentonite plug as identified in the soil gas well details on the plans. F Measure the top depth of each bentionite plug from surrounding grade with a weighted measuring tape in the presence of the EHD inspector and the Engineer. Adequately hydrate bentonite plug per manufacturer's recommendations. Allow 30 minutes for bentonite plug to hydrate. G Provide the quantity of bentonite bags used for each bentonite plug to the Engineer. H Install well enclosure after hydrating the upper bentonite layer. If left overnight, protect the bore hole from soil falling into the hole. I Maintain probe pipe spacing inside the well enclosure as shown in the plans. 4.04 PROBE PIPE COCK VALVE INSTALLATION. A Probe pipe cock valve shall be installed after the well enclosure. B Cut probe pipes to install probe pipe cock valves. When installed, probe pipe cock valves shall have clearance from the top of the well enclosure lid as specified in the well enclosure details. C Install color coded Polyethylene tubing inside the corresponding probe pipe. D Install PVC fittings on probe pipe as shown on the soil gas well figures. Apply Teflon tape on all threaded fittings. All fittings shall be secure and tight. E Connect Polyethylene tubing to the cock valve and then install cock valve on probe pipe. FH-LFG System Upgrade Phase 1 Section 01730 Page 26 Technical Specifications Soil Gas well