Pine Ridge

THE TREATMENT FACILITY FOR PINE RIDGE S.D. WAS CONTRACTED THROUGH INDIAN HEALTH SERVICES IN CONJUNCTION WITH THE OGLALA SIOUX TRIBE FROM MARCH 2008 TO AUGUST 2008. THE PROJECT ENTAILED MOVING 732,000 CUBIC YARDS OF EXCAVATION AND INSTALLING APPROXIMATELY 8000 LF OF PIPING WHICH RANGED FROM 4 INCH TO 12 INCH IN DIAMETER. NUMEROUS VALVES AND STRUCTURES WERE ALSO INSTALLED FOR ISOLATING AND TRANSFERRING THE WASTE WATER TO AND FROM CONTAINMENT CELLS SO TREATMENT OF RAW SEWAGE COULD TAKE PLACE NATURALLY. INCLUDED IN THESE STRUCTURES WERE FLOW CONTROL VALVES CALLED THIRSTY DUCKS WHICH WOULD LIMIT FLOW FROM ONE CELL TO 710 G.P.M. BETWEEN MAIN CONTAINMENT CELLS. IN ADDITION TO THE FLOW CONTROL VALVES, DISTRIBUTION HEADERS WERE PLACED ON LOWER CELLS TO CONTROL AND FURTHER TREAT EFFLUENT. THE MAIN CONTAINMENT CELLS ALSO HAD IN EXCESS OF 10.000 CUBIC YARDS OF RIP RAP PLACED FOR EROSION CONTROL AND STRUCTURAL SAFEGUARDS FOR WILDLIFE. THE FINAL CONTAINMENT AREAS AND OUTLET STRUCTURE WILL HAVE WATER QUALITY PURE ENOUGH TO MEET EPA STANDARDS FOR DISPERSION BACK INTO NATURAL SURROUNDINGS.