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10 LC DBM Above A geotextile fabric separates the subgrade from the various sections of rock – a layer of #2 crushed rock, followed by a layer of #57, and a layer of #8 setting bed. "The different gradations of rock sit on top of one another without migrating," explained Hays. "They're all compacted, and drains are placed into it. There was a lot of time and engineering put into it." Left According to the manufacturer, the pavers have the capability to generate aver- age permeability flow rates of up to 100 inches per hour. On Allston Way, a storm that produced 1.75 inches of rain in 19 hours had its runoff reduced by 94 percent. derground utilities and trees along the street. In addition, a system of berms and sub-drains manages water entering the pavement to maximize infiltration into the subgrade. During the six-month, two-phase project, seven-man crews installed Eco- Priora pavers, which feature an inter - locking joint and a micro-chamfered top edge profile that can generate an initial average permeability flow rate of as high as 100 inches per hour. Custom yellow and white pavers were installed to create a bold contrast with the darker reddish orange and charcoal pavers so driving lanes, pedestrian crossings and other required roadway markings are permanent and do not require restrip - ing. According to Randy Hays, CEO of EPD, the two-phase installation approach allowed for some give-and- take with the location of the stripes to accommodate last minute shifts in alignment. The expert installation, which fea - tured quarter-inch joint and interlock- ing spacer bars, created an extremely smooth surface for bicyclists and skate - boarders to safely enjoy. "In fact, the permeable paver surface is likely safer for cyclists to traverse in wet conditions because it prevents standing water," ac - cording to Don Irby, P.E., supervising civil engineer with the city of Berkeley Public Works Department. An initial stormwater monitoring report found that Allston Way reduced 94 percent of runoff during a storm that produced 1.75" of rain over a 19-hour period. The success of the project helps vali - date the value of PICP systems for mu- nicipalities and offers a blueprint for re- newing streets with tangible long-term cost, maintenance and environmental benefits. "The city of Berkeley is really committed to the environmental aspects of construction," said Hays. "Sustain - ability in the construction industry, es- pecially with regard to water conserva- tion, is very important. Building streets that actually return water to an under - ground system is a pretty cool thing." LC DBM (Continued from page 8)