Lower Kuskokwim School District stated purpose is to replace the Napaskiak School’s existing sewage treatment lagoon with a new facultative lagoon that will provide sufficient treatment capacity based on the future estimated population of students and faculty. Lower Kuskokwim School District proposes to construct a two‐cell sewage treatment lagoon for the treatment of domestic wastewater. The lagoon would measure approximately 120,000 square feet (2.8 acres) in area, and be situated entirely in wetlands. The lagoon would be bounded by berms built in 1‐foot lifts to create 3:1 interior slopes and 4:1 exterior slopes, with a final height 8 feet above the existing grade. This berm height provides a 3‐foot freeboard height above the liquid volume, and a 2‐foot depth for sludge storage, in accordance with the ADEC design criteria. With this geometry, the berm construction would require approximately 17,000 CY of granular silt. Approximately 1 foot of organic silt would cap the exterior slopes to be vegetated for erosion control and bank stability. Please contact Jason Berkner at (907) 753-5778, toll free from within Alaska at (800) 478-2712, by fax at (907) 753-5567, or by email at Jaosn.R.Berkner@usace.army.mil if further information is desired concerning this notice.
POA-2013-642, Kuskokwim River_PN
POA-2013-642, Kuskokwim River_PN Drawings