Connections

Issue 2 • Volume 3 • April 10

ENVIRONMENT

Jack B. Parson Companies Donates Material for Parking Lot at New AGC Building

Jack B. Parson Companies donated 545 yards of pervious pavement for the new AGC parking lot in Salt Lake City.

Jack B. Parson Companies (JBP) recently collaborated with several contractors to donate materials, time, labor and equipment for an innovative pervious pavement parking lot at the new Associated General Contractors (AGC) building in Salt Lake City. JBP donated recycled road base and 1-1/2-inch rock, in addition to concrete for the pervious pavement, curb and gutter and approaches.

Pervious pavement is porous and permeable, which helps recharge ground water and prevents storm water runoff, making it an environmentally favorable alternative to standard pavement.

JBP developed the pervious pavement mix using 3/8-inch aggregates monitored to ensure adequate hydration. Trapping water in the mix not only prevented paste migration, but also kept voids in the mix at 20 percent – critical for a successful pervious mix.

Before placing the pervious pavement, JBP installed a retention pond under the parking lot to hold water that will filter through the pavement during rain or snow melt. A 6-inch perforated pipe directs overflow into the city’s storm drain system. Because pervious pavement helps to filter contaminants, water seeping back into the soil or into the city’s storm drain system is cleaner than water running off standard pavement. Filter Fabric

"This was a great project," said Lonnie Gray, quality control technician. "Everyone understood the complexity of coordinating the timing of each task and worked together to make it happen. The job went like clockwork, because the cooperation was flawless."

JBP completed its portion of the project early by using rock slinger trucks to place the rock for the retention pond. Additionally, JBP used a telebelt truck to place a roller screed to compact the pervious pavement, reducing placing and finishing time.

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