Excavation of rock in sensitive area 8-10′ cut Blue Granite Autostem resivoir excavation 48′ x 16′ x 12 deep excavation of a rock 4′ x 4′ pattern 1-2 550g cartridges per hole 5′- 8′ deep 1-550g, 8-12′ deep 2 550g cartridges decked at 12′ & 6′.