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Replacement Costs. Although costs vary according to the size of the leach field, soils and costs of local permits, expect to pay between $5,000 and $20,000 for leach field replacement.It is the most expensive component of the septic system.eplacement Costs. Although costs vary according to the size of the leach field, soils and costs of local permits, expect to pay between $5,000 and $20,000 for leach field replacement.
Designing a leach field involves spacing the perforated pipe for proper drainage. Trenches for the pipes contain gravel and may be as long as 100 feet. Each trench is 1-3 feet wide with 6 feet between each trench.Place the pipes in the leach field a minimum of 6 inches and most likely between 18 to 36 inches deep according to the Clemson Cooperative Extension.Each leach field requires an individual design as soil and water tables vary from state to state and within states.esigning a leach field involves spacing the perforated pipe for proper drainage. Trenches for the pipes contain gravel and may be as long as 100 feet. Each trench is 1-3 feet wide with 6 feet between each trench.