I can't get the map thing to come up with the new location for the local dump, but if you go on the Cycletrack to Balloch (it runs next to the River Leven and is called Woodyard Road on the map), when you get to the overbridge with the A82, you will see a road that forks off the A82 to your left and joins with Renton Road to.... well, Renton. Well, there is a path up to the A82 at that bridge and is only a short distance from where the road forks off. As you come down this road off the A82, you cross over the railway and past the farm and the dump is there at the junction to your right, you can't miss it really.
Alternately AND PROBABLY SAFER, just take Renton Road from the junction at Dalreoch railway station. Basically, it is between Dalreoch station (Dumbarton) and Renton, but the dump is before it, the railway and the cycletrack run under the A82, if that makes sense.
If looking at it on the map provided, it is next to what looks like a large white silo.
Hope that makes sense!