Habitat Rock for Abiquiu Dam

• Large Rocks for this project must be blocky in shape, not round, with at least two parallel sides. The project requires large rocks with a nominal size of 3 - 5 ft. and the typical weight per rock is 2-5 tons. Typical dimensions for the boulders are shown in the illustration below, with the "Long Axis" dimension ranging from 4 - 6 ft, the "Intermediate Axis" ranging from 3 - 5 ft, and the "Short Axis" ranging from 2 - 3 ft. The rock material must have a minimum specific gravity of 2.60. The rock material must be sufficiently durable to withstand freeze-thaw cycles, and must demonstrate conformance with the NMDOT spec for riprap hardness. Final approval of all boulders shall be made prior to any rocks being furnished to the project site. (See appendix A)

• The Contractor is advised that small and/or awkwardly shaped rocks will make the construction of rock habitat structures much more difficult than large blocky rocks would. Careful selection of the large rocks at the supply pit will be an important step to ensure a timely and efficient process of constructing the fish habitat structures.

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