RecDoc 2014-041378 SWTM 1300 Maple St

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Exhibit C utes for the�vater to stop flowing are clogged to some degree(Figure 4). " P'��'"�"'� � : , During the site visit, the inspector can scout for u � weed growth and trash deposition. If the permeable e ; pavement is underdrained,the underdrain outlet should - �� • �`�� be checked to verify it is not blocked. If the visit occurs �� after a storm, a trickle of water would be expected from � � �� ' '��s� the underdrain. � �. �� � � ,' � STREET SWEEPiNG ,�'� � ,� � d3*� u i '�� dl�a Street sweeping is the most important maintenance task ��. � �,�, �� " associated with permeable pavement. Street sweeping �` `{' � � can serve one of two purposes: preventive maintenance F� ��~�' �f� � �-� �`�' ;� and restorative maintenance. Preventive street sweeping �� f��f'��` " � �' 'a� ��r°� is preferred. Preventive sweeping is regular scheduled �� ' �' � e'Ft.,z4,....�..a��Cr..�� :. .„�.d�.ah�2�3�,.: «tl�.� �.,.�, . . ,n,s passes by a street sweeper during a calendar year. While the exact frequency has yet to be determined, it appears � two to four visits er ear for most ermeable avement - � �� P Y P P �:. �.N��_. applications is sufficient. If the permeable pavement has x� ` � � been neglected for several years, however, preventive � ` '� �..;�N. ' ii` maintenance will not be sufficient, so restorative street y� '�" �� ° � sweeping will be required to restore a pavement's abil- � �� ity to infiltrate water. The type of equipment needed to � � achieve either preventative maintenance or restorative maintenance is not the same. F, .. ,, � Types of Street Sweepers ' �' � ' _.�, � _ � �� , "� There are three main classes of street sweepers: (1) m � � �°�� �4<�"' � °� �� mechanical, (2) regenerative air, and(3)vacuum. Exam- ° ° - � ° ples of ineChaniCal and vacuum sweepers are shown in Figure 5.A small mechanical street sweeper(top)and the Figure 5. underpinnings of a vacuum sweeper(bottom). Mechanical street sweepers are the most com- mon street sweeper on the market. By some accounts, percent of street sweepers in the U.S. They function by approximately 70 percent of street sweepers in the U.S. applying a strong vacuum to a re(atively narrow area are mechanical street sweepers (Mark Kinter�). Mechan- that lifts particles both at and below the surface of the ical sweepers employ a multiple brush approach to first pavement. Vacuum sweepers have demonstrated their move sediment and trash to the middle and then lift the ability to suction 3 to 4 inches of gravel from PICP and deposits onto a conveyor belt for temporary storage. The have the ability to restore infiltration to some types of brush bristles can penetrate some types of permeable pavements that have been grossly neglected. pavements,but not most. Regenerative air street sweepers are the second most Where do permeable pavements clog? common street sweeper, accounting for roughly 20 per- permeable pavement systems clog at different locations cent of street sweepers in use in the U.S. They work by in their cross-section. Because of this, not one type of shooting air at an angle to the pavement, which effec- street sweeper is recommended for all types of perme- tively loosens dust and other fine particles at and near able pavements. Based upon anecdotal observation the surface of the pavement. Because air is blown across and research, here are the observed zones or depths of the carriage of the truck, a relatively minor vacltum is surface clogging. created,which then (ifts the loosened particles into a Concrete grid pavers, because their gaps are filled hopper. This system removes surface-deposited sedi- with sand, act like a sand filter and trap most of the fine ments from all pavement types. V1CUUm StCeet SWeepOPS aCe th0 Ie1St COmmOl1 1rid �Mr.Kinter is an Elgin Street Sweeper marketing director.Conver- most expensive type of sweepr, and account for 10 sat�on took p�a�e�n 1�tay 2009. 4 Urban Waterways