Laserfiche WebLink
2 Contractor shall place items within the boring in the presence of the EHD <br />inspector. <br />3 Any boring that collapses during well installation shall be re -drilled to the <br />specified depth at no additional cost to the County. <br />B Probe Pipe Installation <br />1 Measure the depth of the well drilled from surrounding grade in the <br />presence of the Engineer and EHD inspector before probe pipe installation. <br />2 Insert each probe pipe carefully in the well borehole. <br />3 Do not bend or kink the probe pipe. <br />4 Probe pipes shall be to a near -straight position in the borehole. Check the <br />the straightness of the probe pipe in the borehole with a flashlight. <br />5 Maintain probe pipe identification. <br />C Backfilling <br />1 The depth and length of the pea gravel sampling zones may be adjusted by <br />the Engineer based on geologic data obtained during drilling. <br />2 Place backfill materials in a controlled manner to avoid bridging, overfilling <br />the boring, or damaging the probe pipes. <br />3 Confirm with the Engineer the required depths of sampling intervals. <br />4 Periodically measure depths of pea gravel backfill from the existing grade <br />level with a weighted measuring tape. <br />5 Measure the final top pea gravel sampling interval depth of each pipe probe <br />from surrounding grade with a weighted measuring tape in the presence of <br />the EHD inspector and the Engineer. <br />6 Place the bentonite plug as identifed in the soil gas well construction <br />figures. <br />7 Measure the top depth of each bentionite plug from surrounding grade with <br />a weighted measuring tape in the presence of the EHD inspector and the <br />Engineer. Hydrate bentonite plug with 3 gallons of water. Allow 30 minutes <br />for bentonite plug to hydrate. Provide the quantity of bentonite bags used <br />for each bentonite plug to the Engineer. <br />8 Install well enclosure after hydrating the upper bentonite layer. If left <br />overnight, protect the bore hole from soil falling into the hole. <br />Corral Hollow Landfill 8 San Joaquin County -Public Works <br />Soil Gas Monitoring Well Specs Solid Waste Division <br />