A property i service has a parking lot in the back side and a ditch at the back of it (i will get a picture soon of it to better explain). But hillside of the parking lot is getting washed out and has gotten close to washing out the corner of the parking lot, the owner asked me if i could do that and i said i would look into it for him. He said he just wants a nice layer of rip rap over the whole hillside and where its getting close to the parking lot. I was wondering how would you go about charging for that i mean of course materials+delivery+labor/install but i honestly have no idea how long it may take. I feel like if I had someone at the truck parked near the hillside he could toss me rocks and i lay them pretty quickly, but not sure. Thanks for any and all the help I may get.