As subconsultant, CEI provided construction management, inspection, and surveying services for improvements to this 5-mile long group of flood retarding structures (FRS) that protect 72 square miles of residential, commercial and agricultural land in both Pinal and Maricopa counties from being flooded. The project runs along Ironwood Drive, from Vineyard Road to Rittenhouse Road, and involves extensive materials testing for clearing, grubbing and excavation of borrowed material to build up the existing canal for flood retardation purposes. CEI’s survey team also completed the QA topographic survey for mapping and verification of quantities on all channel excavation final as-builts, and check of all elevations of the stockpiles for the future dam construction.

The first phase of this CMAR project stockpiled over a million yards of material to raise the Vineyard FRS by 15 feet along with the installation of a sand filter and improvements to the auxiliary spillways. The rehabilitation of the FRS, combined with the changes at Powerline and Rittenhouse Road, will improve dam safety and address flooding concerns for the East Valley. The majority of the work was earthwork, over 1.2M CY was excavated and stockpiled in Phase 1, which will be used in Phase 2 of the project to build up the FRS dam. Also, Phase 1 included low flow channel excavation; installing new range fence; clearing and grubbing site, installing a waterline and grouting the irrigation pipes.