> In article <
irg0v7h3ih35jdgo9...@4ax.com>,
> "(PeteCresswell)" <x...@y.Invalid> wrote:
>
>> We're on a shale ridge: about 4" of topsoil and then solid shale
>> as discovered in
http://tinyurl.com/6u672oj
>>
>> I want to run some 2" PVC conduit to a new shed and don't think
>> 4" is going tb deep enough.
>>
>> Has anybody used a small Ditch Witch on shale? I was able to
>> bore through several feet of the stuff using a pry bar, so it's
>> not like it's solid rock. OTOH, I don't want to blow $150 on
>> the rental only to find it can't handle the job.
>
> It'll probably EVENTUALLY do the job, but I wouldn't expect much in the
> way of speed, and I don't think I'd want to be the one running it.
>
> DWs were designed with the concept of "Mostly dirt with a few rocks" in
> mind. Despite the visual resemblance, they're not really the "chainsaw
> for rock" that some people seem think they are.
>
> As long as it's just "dirt with some rocks and roots", a DW can save you
> a helluva lot of time. Get into a situation where you've got more rock
> than dirt, and you're going to be doing a lot of bitching about how slow
> it is - if it makes any progress at all.
>
> If you decide to try it, make sure the kids and the dog aren't anywhere
> near, and stay *VERY* alert - while one of the bigger units might be
> able to do the job you're talking about, it wouldn't surprise me to see
> one of the little ones jump around like something that belongs in a
> rodeo while trying to handle what you're trying to get through.
>
I have used a smaller unit with some success. but you often need to be
ready to manually assist. One job was mostly dirt but with some rocks. The
smaller rocks got tossed out with the dirt. The larger rocks kept falling
Shale comes in various styles. Is it pretty flaky? The flakier the better
tough spots, but I would imagine it would be worth the money.