Means of preventing the uncontrolled release of metallic degradation products into the environment, as well as ballast for the execution of the method

摘要

Uncontrolled discharge of metallic degradation products into the environment is prevented by using a bullet backstop (1) for a shooting range. Prevention of uncontrolled discharge of metallic degradation products into the environment involves using a bullet backstop for a shooting range. The bullet backstop comprises inclined parallel material layers (3, 4) including a watertight bottom layer that conducts percolating leachate to an intercepting device located beneath the bullet backstop, e.g. a drainage pipe (5) emerging in a container (10), and a projectile-stopping layer, e.g. sand located above the bottom layer where the projectile-stopping layer is of thickness to intercept shot projectiles. The metal-ion-enriched rainwater collected in the projectile-stopping layer has been provided with pH-neutralizing material and is in direct contact with the atmosphere, is able in the form of leachate to percolate into an underlying water-permeable layer of gravel or crushed stone material of coarse fraction, mixed with pH-neutralizing material, e.g. crushed limestone so that pH-neutralized leachate is able to run off via the watertight bottom layer and the intercepting device. The pH-value of the leachate in the intercepting device is checked at least intermittently by means of a measuring member.