A few weeks ago, I drove down to Chollas Creek, downtown at the south end of Highway 15, to help with a "Clean Sweep" event. I thought it would be like the typical beach cleanup, where we pick up candy wrappers and cigarette butts. Instead, I filled perhaps a dozen trash bags with sneakers, wires, metal parts, spray cans, you name it. The place was a mess. The silty bottom was soft enough that my boots sank several inches with nearly every step. I had to hose down my boots and take three showers to get rid the organic chemical smell.