Our Recent Projects

Mississippi Phosphates Corportation (MPC) Superfund Site Remediation

The Mississippi Phosphate Corporation (MPC) Superfund Site in Pascagoula, MS, is an abandoned diammonium phosphate fertilizer plant where KEMRON Environmental Services has been leading the remediation efforts since 2016. Under CERCLA, the EPA took over operations following MPC’s bankruptcy, with KEMRON managing the site’s extensive environmental challenges under a series of task orders, totaling in excess of $170M.

Water Treatment and Management: KEMRON’s primary task was to manage and treat the site’s highly acidic leachate and runoff, totaling 1.5 million gallons per day. The existing water containment system held approximately 500 million gallons of contaminated water, and rainfall added an additional 9 million gallons of wastewater per inch. KEMRON introduced an innovative in situ treatment process, using spent lime slurry to buffer low pH water. This method increased the treatment capacity from 1.5 million gallons per day (MGD) to over 4.0 MGD, improving efficiency by 20%. The process also resulted in annual cost savings of over $2.5 million due to reduced chemical usage, including lime and hydrochloric acid.

Infrastructure Improvements: Significant infrastructure improvements were essential for the site’s rehabilitation. KEMRON repaired and reinforced over five miles of levees and berms and dredged more than three miles of ditches to manage sediment accumulation, using the dredged material to strengthen the levees. Switching from diesel to electric water pumps, along with constructing new high-voltage lines, further enhanced system reliability and reduced operational costs.

Capping the East Gypsum Stack (EGS): To minimize contaminated water generation, the EPA awarded KEMRON contracts to cap the EGS, divided into phases 1A, 1B, and 1C. The innovative Closure Turf product was selected for its cost-saving and maintenance-reducing properties, marking its first application on a gypsum stack.

Phase 1A began with draining and dredging Ponds 3 and 4, utilizing approximately 200,000 cubic yards of stabilized spent lime for shaping the west slope of the stack. Engineering modifications, approved by the EPA, included creating pipe drops, terraces, and sediment ponds to manage water flow and replace traditional silt fences. This phase required 257,000 cubic yards of earthwork, completed ahead of schedule.

Phase 1B involved shaping the southern slope with 312,000 cubic yards of earthwork. Like Phase 1A, erosion control measures were implemented, and Closure Turf was used for capping the 51-acre site.

Phase 1C, awarded at $35 million, represents the largest HUBZone award in EPA history. KEMRON, in a joint venture with Leisnoi, managed the installation of a liner/closure turf system, stormwater diversion, surface impoundment dewatering, and a leachate collection system. This phase included 440,000 cubic yards of earthwork and the installation of 71 acres of Closure Turf.

Ongoing Operations and Maintenance: Routine infrastructure operations include pump and motor repairs, lime slaker maintenance, and effluent sample analysis for NPDES compliance. KEMRON’s enhancements were rigorously tested during a record rainfall year in 2017, successfully containing and treating the excess water without any release of untreated waters.

Since 2016, KEMRON has treated over billions of gallons of wastewater at the MPC site, significantly improving environmental health and safety. Their comprehensive approach to water treatment, infrastructure improvement, and innovative capping solutions demonstrates KEMRON’s expertise in managing large-scale remediation projects effectively and efficiently.


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