The bits of ground up debris have a tendency to look like piles of broken shells on a beach and they can be pushed up into little drifts. You might see tiny green weeds poking up through the dirt. There might be remnants of cement slabs. The debris can be quite colorful, although in kind of somber tones (rusty bits of metal, brick, sand and dirt, cement, dried broken off wood chunks and saw dust shavings, tar and black top from the street, bits of white ceramic from bathroom tiles and toilets and sinks, random nails, screws, washers, mixed with dried up bits of paper and plastic sheeting and lots of dust and occassional bugs.) You might also see garbage left over from the workers lunches: aluminum soda cans, plastic soda bottles, fast food bags and greasy french fry wrappers, empty used ketchup packets, straws. A piece of garbage might be blowing around in the breeze, caught up in a little whirlwind. There is likely to be severa dented dusty old trash cans sitting around and maybe a broom or an old shovel or a hammer and maybe a big rusty old dumpster (with the remnants of the dumpster company logo chipping away from the paint). The scent would be mainly of dust, and if there has been some rain, it might have a similar smell to when rain first hits hot cement in the summertime. There can be that stinky garbage smell if there are any muddy pools of water that have been sitting there for awhile. Those pools (although likely to be shallow) will be dark and murky with a kind of oily rainbow looking swirl sitting on the surface. You might actually be able to see the reflection of the sky and clouds above in the tiny pools. You might see a few pieces of rusty gnarled rebar sticking up out of the dirt, looking like a broken metal human spine. If the site is in a hot area, you might see a scurrying lizard. If there is a bit of a breeze, you might hear and see some gritty dust being swirled around.