In a shallow dish, cover eight 10-inch bamboo skewers with water and set aside to soak.
In a small bowl combine the tarragon, thyme, oregano, garlic powder, pepper, and oil. Add the scallops and toss to coat. Cover the bowl and refrigerate for 2 - 10 hours.
When ready to cook, prepare the grill.
Divide the scallops between the skewers, threading them through the sides. Season with salt. Grill until the scallops are golden brown on both sides and opaque in the center, about 4 min per side. Serve with lemon wedges.