Been up and down Hewitt Station rd many times. After you make the left towards Queen Valley, and the the right on to HS Road,cross the tracks, and everybody shoots there guns into the hills and mountains north of the road.
Of course there are a few strange souls out there also.
If you go to the dam, there are usally about a dozen or more out there in that area as well.
Be carefull of that area as you have just found out.