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MAN T E a- I'\ptnjcct\263-075\sawkpl be placed by tremie pipe. As the sand is placed, the driller will measure the depth to top of sand periodically to ensure that the materials are at the correct depth and that the sand has not bridged. During placement of sand, the driller will surge the well casing with a surge block or casing to allow the sand pack to settle. The well will be sealed by placing a Moot thick layer of bentonite pellets. During placement of the bentonite pellets, the driller will measure the top of the pellets to ensure that those materials are at the correct depth. If the depth interval for the bentonite pellet seal is above ground-water level, the driller will add at least 5 gallons of water to the bentonite pellets and allow them to hydrate for at least 1/2 hour before placing the remaining well seal. If the depth interval to be sealed by bentonite is below ground-water level, the driller may tremie a slurry prepared with bentonite powder and water. The top seal will consist of a bentonite/cement grout slurry. This slurry will be placed through tremie pipes, from the top of the bentonite pellets to ground surface. After preliminary well completion, each well location will be secured by placing a locking metal monument over the well casing. The well monument will be placed in concrete. For the well to be located on the nursery property, the driller will place three metal posts filled with concrete around the well. The posts should be at least 5 feet long, and be set at least 2 feet in the ground. The driller will paint all the well monuments and posts bright yellow. ESE will stencil the corresponding well number on each monument in 1-inch high Ietters. Task 6. Analyze Soil Samples for Petroleum Hydrocarbons-ESE will submit four soil samples from each boring for analysis. Unless a specific depth is noted,the samples to be submitted will be selected based on the results of head-space analyses. The four samples are: One sample, to be selected from the depth interval corresponding to the extent of the former tank excavation (0 to 18 feet) 6