transitive. 1  To reverse the winding or twisting of: unwind a ball of yarn. 2  To separate the tangled parts of; disentangle. 3  To free (someone) of nervous tension or pent-up energy.
A leach field is an important part of a septic system. It disperses fluid from the septic system over a large area of soil adjacent to the building it services.he distribution box has another pipe that leads to the leach field. From this pipe, you will dig the trenches. Decide where to dig your trenches. You will need to dig three trenches, each about 12 inches wide and 20 feet long.
Leach Field Replacement Costs. Two variables determine the cost of replacing a leach field: its size and the presence of contaminated topsoil. If the pipes that deliver gray water -- the nonpotable water flushed from a septic tank -- to the leach field are merely cracked, you need only replace them.Budget about $5,000 for this fix.Costs are considerably higher if sewage has leaked through the septic system and contaminated the soil below the leach pit.In this scenario, you must excavate the contaminated soil and build a new a leach pit, which can cost up to $10,000.udget about $5,000 for this fix. Costs are considerably higher if sewage has leaked through the septic system and contaminated the soil below the leach pit. In this scenario, you must excavate the contaminated soil and build a new a leach pit, which can cost up to $10,000.