Published on Wednesday, 30 November -0001 00:00
Minnesota Pollution Control Agency, Municipal Division, has issued a public notice of intent to reissue State Disposal System (SDS) Permit MN0052647 for the city of Kimball - Kimball Wastewater Treatment Facility, 83rd Avenue, T121N, R29W, Sections 1 and 12, Maine Prairie, Stearns County. Public comment period begins: Jan. 28, 2008. Public comment period ends: Feb. 26, 2008. The current permit was issued Dec. 16, 2002, and the current permit expiration date is Nov. 30, 2007. Facility description The Kimball Wastewater Treatment Facility is located in the SW 1/4 of Section 1 and the NW 1/4 of Section 12, Township 121 North, Range 29 West, city of Kimball, Stearns County. This is a Class D facility. Existing facility The existing facility consists of a three-cell stabilization pond system and three center pivot spray irrigation sites totaling 120 acres. The facility is designed to treat an annual average influenct flow of up to 82,000 gallons per day (gpd) with a five-day carbonaceous biochemical oxygen demand strength of 203 milligrams per liter. The facility has two primary ponds and one secondary pond that have surface areas of 5 acres each. The wastewater is land applied via spray irrigation across 120 acres of land near the stabilization pond system. At design flow, the facility has a detention time of 210 days. There are two existing ground water monitoring wells at this facility that are sampled three times per year. There are no known bypass or overflow points known to exist at this facility. Proposed facility The city of Kimball (City) will increase the operating depth in each of the stabilization ponds by utilizing an additional foot of storage capacity within each pond. Each of the pond cells was designed and built to a depth of 10 feet, rather than the more common depth of nine feet. The city also proposed to add supplemental mixing/aeration to the primary ponds to ensure proper treatment of the wastewaster. Since the stabilization ponds at this facility are 10 feet in depth, the operational depth can be increased from the 2-6 foot capacity to the 2-7 foot capacity. In order to use this increased depth, the city must utilize mixing and aeration in each of the primary ponds that contain greater than 6 feet of water. Adding this additional foot of operational depth allows this facility to adjust the design flow up from 82,000 gpd to 120,335 gpd with the same detention time of 210 days at design flow. Preliminary determination
on draft permit The MPCA commissioner has made a preliminary determination to reissue this SDS permit for a term of approximately five years. A draft permit is available for review at the MPCA office at Detroit Lakes; at the St. Paul office: 520 Lafayette Road; and online at www.pca.state.mn.us/news/data/index.cfm?PN=1. A copy of the draft will be mailed out if the MPCA receives written or oral requests at any of these offices. For more information, call Holly Christensen at (218) 846-0775.