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• • <br />Chapter 4-Site-Spec Industrial Storm Water BMPs <br />[7 <br />What Are They <br />Excavation (i.e., removal of contaminated material) of released materials is typically conducted by <br />mechanical equipment, such as plows and backhoes. Generally, plowing and backhoeing can be <br />done using a specifically designed vehicle, tractor, or truck. <br />Excavation removes the materials of concern and any deposition of contaminants, thereby reducing <br />the potential for storm water contamination. Mechanical cleanup methods are typically less precise <br />than manual cleanup methods, resulting in reduced opportunities for recycle and reuse. <br />I When and Where to Use Them <br />Excavation practices are most useful for large releases of dry materials and for areas contaminated <br />by liquid material releases. In excavation, you want to be sure that all of the contaminated material <br />is removed. <br />Timing is an important consideration for all mitigative practices. To be effective as a storm water <br />control, cleanup must take place before a rainfall event. <br />• What to Consider <br />Conduct inspections and operations and maintenance in accordance with a manufacturer's <br />recommendations, which may include the following: <br />• A specified frequency for inspection, maintenance, and servicing of the equipment <br />• Parts replacement, rotation, and lubrication specifications <br />• Procedures for evaluating all parts. <br />As with any equipment used during cleanup, other considerations apply, including the following: <br />• Plows, backhoes, etc. should be stored appropriately with no exposure to precipitation <br />• Excavated materials should be properly handled or disposed of. <br />Advantages of Excavation Practices <br />• Are a cost effective method for cleaning up dry materials release <br />• Are common and simple <br />Disadvantages of Excavation Practices <br />• Are less precise, resulting in less recycling and reuse opportunities <br />4-31