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t <br /> 2. Insert bottom end of sampling tubing into large end of a rubber <br /> stopper. <br /> 3. Join perforated probe section to bottom section of probe pipe. <br /> 4 Cut sampling tubing to correct length and insert top end into small <br /> end of rubber stopper. <br /> C. Fabrication: <br /> 1. Do not use solvent cement to complete joints. <br /> D. Dimensions: <br /> 1. The depth and length of the pea gravel sampling zones may be <br /> adjusted by the Engineer, based on geologic data obtained during <br /> the drilling. <br /> 3.06 SOIL GAS WELL INSTALLATION <br /> A. Complete installations as promptly as progress of the Work permits. <br /> B. Set probe pipes vertically plumb in the borings. <br /> C. Backfilling: <br /> 1. Place backfill materials in a controlled manner to avoid bridging or <br /> overfilling the boring, or damaging the probe casings. Remove any <br /> loose vegetation from the area of the borehole and avoid placing of <br /> any organic materials into the borehole. <br /> 2. Minimize wetting of the sidewall of the boring, to avoid build-up of <br /> hydrated bentonite on the surface. <br /> 3. Add water after 2 feet of pea gravel has been placed over bentonite. <br /> Add 30 gallons of water to hydrate each bentonite lift. Do not add <br /> excessive water, which would flood the sample zone. <br /> 3.07 CEMENT SLURRY INSTALLATION <br /> A. Cement slurry shall be installed four hours or more after hydrating the upper <br /> bentonite layer. If left overnight, protect the bore hole from soil falling into <br /> the hole. <br /> Soil Gas Monitoring Well Specs San Joaquin County-Public Works <br /> Foothill Sanitary Landfill& 9 Solid Waste Division <br /> Corral Hollow Sanitary Landfill Printed 10/10/2007 <br />