Leisnoi Diversified Service’s (LDS’s) partner KEMRON was awarded a task order for the remediation of the former Mississippi Phosphates Corporation (MPC) located in Pascagoula, MS. The site has been proposed to the National Priorities List (NPL). MPC began operations in the 1950’s manufacturing fertilizer and eventually expanding to encompass over 1000 acres and includes a phosphoric acid plant, a diammonium phosphate plant, a sulfuric acid plant, and associated storage warehouses. The facility also includes a wastewater treatment plant along with a series of support structures. Material storage areas include two phosphogypsum waste piles (gypstacks) covering over 340 acres and wastewater storage ponds containing over 700 million gallons of low pH wastewater. Contaminants include ammonia as nitrogen, arsenic, cadmium, chromium, copper, lead, nickel, and zinc. Requirements under this task order include operation and maintenance of wastewater storage units, operation, and maintenance of the wastewater treatment plant, pond management and repair and maintenance of all associated equipment.
KEMRON was recently awarded an additional fixed-price task order for the construction of the Phase 1A cap, which focuses on the closure of the western slope of the East Gypsum Stack (EGS). Closure activities include grading of side slopes, benching, and installation of the downslope channels; and placing geomembrane cover; access road construction; and temporary storm drainage culvert installation. LDS is supporting KEMRON in its work on temporary storm drainage culvert installations with staff and equipment.