This cache is beside a quarry operated by Mountain View Quarries. Web information is that they extract building material for use in housing developments in the region. Basalt is extracted and crushed in one of several crushing plants on site, so expect it to be busy and noisy at times. You will not be visible from the quarry at the cache location.
I can see the discussion now -
"Boss, I think I know where all those rocks are coming from."
"I reckon you are right."
You are looking for a small container. Unless you have a 4WD or an AWD this one is best approached from the south due to the ford to the north.