Spring Lake Site-Specific Eutrophication Standard Justification

The purpose of this document is to provide justification for assigning site-specific eutrophication water quality standards for Spring Lake (Lake ID 70-0054-00) in Scott County, Minnesota (Figure 1). The current lake eutrophication water quality standards and the site-specific standards for total phosphorus (TP) and the associated response variables, chlorophyll-a (Chl-a) and Secchi disk depth (SD), are provided in Table 1. The current standards correspond to those for deep lakes in the North Central Hardwoods Forests ecoregion. The basis for the proposed standard is discussed later in this document.