PMI’s team of Professional Engineers has received the following American Council of Engineering Companies (ACEC) Engineering Excellence awards:
PMI designed and provided construction management for a recirculating media filter for the Riviera Utilities wastewater treatment facility. The design incorporated much of the existing infrastructure, including conversion of the existing intermittent sand filters to recirculating media filters, and installation of four Orenco Advantex pods and two 30,000-gallon buried fiberglass tanks. An operations building with new chemical feed equipment, automation and controls was constructed. By utilizing an attached growth system, long-term O&M costs are significantly less than a mechanical plant. The plant has been in compliance with all effluent limitations since construction.
The Ed Banks Bridge, the central crossing for the Cossatot River State Park, was closed in 2015 due to severe damage from high water flows and deterioration from age. In order to restore the crossing point, PMI demolished the former bridge, poured and anchored new piers into bedrock, and connected precast concrete bridge decking units to the piers and new approaches. Parking bumpers were placed along the edges of the bridge for safe vehicular travel and information signs were installed as safety warnings. High-river flows have occurred since project completion without hindering the low water bridge. The bridge replacement reopened access to public amenities offered by the park, including restoring the most popular paddling access point and reconnecting the river trail.
The City of Hot Springs was one of the first municipalities in Arkansas to issue a stormwater fee to its residents. Though the City first issued a flat rate, it soon became clear that this was not appropriate, as some parcels had a larger impervious area and, therefore, generated a larger stormwater runoff than others. PMI partnered with EFS GeoTechnologies to utilize proprietary GIS software to determine and delineate the impervious area of the entire City of Hot Springs. The data was cross-referenced to assign a residential or commercial designation and an impervious area size. As a result, the City of Hot Springs developed a rate schedule that properly reflects the impact each property has on the watershed and the City can continue to fund necessary repairs and uphold best management practices.
ACEC Arkansas Chapter Engineering Excellence Award
ACEC National Recognition Award
Category – Environmental
Lion Oil Company had three acid tar pits with historic refinery wastes in them that required closure under an EPA permit. PMI engineers partnered with FTN Associates to design an alternative closure system for the pits that could protect human health and the environment. Based on the study of alternatives, PMI found the solution to be a water cap using lightweight materials of rice hulls and HDPE liner to isolate the waste from the water cap. Now stormwater flows through the closure system and is discharged. The closure system blends with the natural environmental and requires very little operation and maintenance.
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