ng of ParkingGarages
are much quieter but do not have the same mechanical suction ability, so that it requiresmoving the vacuummore fre- quently, because of shorter vacuum hoses, so that it will achieve the maxi- mumeffectiveness.
Other contractors will block off
drains using specifically designed drain balloons. The drain cover is removed, and the balloon is inflated to prevent any contaminated water from going into the
Continued on Page 36
ing when the garage is going to be cleaned, so that electronicmonitors can be set up to verify there is nothing but rainwater going down the stormdrain. There are many ways of accom-
plishing a thorough garage cleaning while remaining in compliance with the local regulations. All of the methods described here
are going to require a filtration system that is used by the contractor to remove sediment, debris, oils or other chemi- cals fromthewater to prepare it for dis- posal down a sanitary sewer or through a wastewater interceptor. The first method is a vacuum
recovery system. This involves a sur- face cleaner similar to a lawn mower that is hooked up to a pressure washer and a vacuum motor. Different types of vacuum motors are commonly used by contractors. Some are mechanical roots-type
blowers driven by a gasoline engine. These provide the most suction, thus reducing the possibility of leaving any dirt or debris on the floor or walls of your garage. Others are electric, which
DECEMBER 2009 • PARKING TODAY •
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