Water Recovery

Water recovery is part of how RoofCleaning.org plans roof cleaning, pressure washing, and exterior cleaning work where runoff needs to be controlled. Crews may use discharge vacuums or a full water recovery unit depending on the job size, site conditions, and local requirements.

The goal is to keep wastewater away from storm drains when recovery is required, protect surrounding areas, and leave the site organized at completion.

Water Recovery Discharge Vacuums

Water Recovery and BMP Awareness

Full Water Recovery Unit

1. General Best Management Practices (BMPs) and Preparation of Work Area What should I do prior to conducting a job? The BMPs presented below are intended to help you comply with local and state regulations that prohibit wastewater from entering the storm drain system. The following BMPs must be followed by all mobile businesses or outdoor activities of a fixed business that generate wastewater, regardless of the type of surface to be cleaned or cleaning operation to be performed: • Evaluate the chemicals and compounds used for cleaning and reduce or eliminate the use of those that contain solvents, heavy metals, high levels of phosphates, or very high/very low pH that exceeds the local sewer agency requirements. • Walk through the area where the cleaning will occur prior to the start of the job and identify all area drains, yard drains, and catch basins where wastewater could potentially enter the storm drain system. • Block/seal off identified drains or catch basins using sand bags, plugs, rubber mats, or temporary berms. • Collect all trash and debris from the project area and place them in a trash bin for disposal. • Sweep all surface areas prior to cleaning to minimize the amount of suspended solids, soil, and grit in wastewater. • Identify the wastewater disposal option that will be used. Whether you are discharging to landscaping or the sanitary sewer, it is necessary that you meet all the requirements identified below. • Conduct mobile washing in accordance with all operating instructions provided by the equipment supplier. Maintain equipment in good working order and routinely check and test all safety features. What methods can be used to collect wastewater at a site? There is no specific containment method that must be used for wastewater collection/diversion. However, the system must be adequately designed so that the wastewater does not flow into an on-site or off-site storm drain inlet. All mobile and existing businesses should use one of the following methods, regardless of the surface to be cleaned or the type of cleaning operation to be performed • Portable containment areas can be made from waterproof tarps, heavy-duty plastic, or rubber matting equipped with berms to prevent wastewater from running into storm drain inlets or discharge off-site. Materials that can be used for berms include sand bags or water-filled tubing. Whatever containment material is used, it must seal tightly to the ground so that no wastewater can pass under or over the berms. • When power washing smaller pieces of equipment, containment devices to use may include portable vinyl swimming pools, plastic 55-gallon drums on casters, and flat metal or plastic containment pads. • Depending on the volume of wastewater generated, it may be necessary to use a pump system, which may range in size from a wet-dry vacuum to a sump pump. A natural basin from which to pump can also be set up by establishing a slightly sloped containment area. IC24 Disposal of Wastewater Generated by Mobile Businesses and Outdoor Activities

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Water Recovery

Water Recovery and BMP Awareness