Arlington County’s incredibly detail-oriented vacuum leaf collection effort (see the county-produced video, above) is slightly behind schedule due to rainy weather.

Arlington is now planning to begin its first leaf collection pass in ‘Zone 4′ neighborhoods on Friday, while Zone 5 (out of five) will have to wait until next Wednesday. Zone 3 collections are still underway, the Arlington Department of Environmental Services said via Twitter this morning.

A second and final round of vacuum leaf collection will take place in December.

Leaf bag collections are still proceeding as normal, on the day after residents’ normal trash collection.