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On April 3, Woodley Park resident Stephanie Clipper joined dozens of other eco-minded volunteers to scour Rock Creek Park for trash in the annual Potomac River Watershed Cleanup. The next day, as Clipper took a two-mile jog through the park, she realized that she and her cohorts ought to have waited a few more days: More than a dozen trash bags, apparently holding refuse from the Credit Union Cherry Blossom 10-Mile Run that morning, had opened up, strewing Gatorade bottles, energy-bar wrappers, and disposable cups along Rock Creek Parkway. A pair of rain slickers were wrapped around park trees. “Why the post-race trash was left by the roadside in that condition is baffling,” Clipper wrote in a letter to race director Phil Stewart, of Bethesda-based Road Race Management. Stewart says his group cleans up every year. “I’m guessing that some of the bags, because of wind, may have been ripped open,” he says. “That’s obviously beyond our control.” —Dave Jamieson