06/08/2005 P&Z Packet - Laserfiche WebLink

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• • I -35E Corridor Draft AUAR June 2, 2005 The runoff volume into the receiving waters will likely increase with development due to the increased impervious area constructed in the AUAR area. However, with the stormwater management requirements outlined in this document, the peak runoff release rates will be decreased from storms of 1 -, 10 -, and 100 - year recurrence intervals. The recommended large area stormwater management elements will result in relatively small water level fluctuations, provide area to enhance the groundwater recharge necessary to provide base flow to the receiving streams, and provide the detention time necessary to cleanse the runoff of contaminants and meter the increased runoff volume to an amount within the receiving streams ecological carrying capacity. Regional Sanitary Sewer Infrastructure Capacity The city has met with Metropolitan Council Environmental Services (MCES) staff on several occasions from 2003 through Spring 2005 to discuss existing and future MCES service to Lino Lakes. The MCES is in the process of updating their comprehensive planning for the "Northeast Region," which includes Lino Lakes, Centerville, North Oaks, Forest Lake, Hugo, White Bear Lake, and White Bear Township. They anticipate the need to provide additional capacity in the Forest Lake Interceptor and downstream facilities to serve the future needs of those communities. Currently, MCES is engaged in plans to construct additional capacity support for the Forest Lake Interceptor. Following a series of meetings in early 2005, MCES agreed to construct an additional interceptor to serve the easterly portion of Lino Lakes. The MCES intends to construct this pipe in 2006, in conjunction with a planned county highway improvement project. The new interceptor should be designed to convey the excess flow not accommodated by the existing Centerville Interceptor. Assuming the existing interceptor can handle 1.7 MGD, the new pipe should be designed to convey flows ranging from 1.3 MGD for Scenario One to 2.5 MGD for Scenario Three (see full discussion under Item 18). Design of the new interceptor is now in progress. Lino Lakes provided flow estimates, based on the Comprehensive Sanitary Sewer Plan Scenario, to MCES in March 2005 (see Item 18 for additional information). MCES has directed the designers to provide capacity in the new interceptor for 2.0 MGD average daily flow. Discussions are currently underway between Lino Lakes and MCES regarding the capacity to be provided in the new interceptor. Assuming capacity remains at 2.0 MGD, the existing and new interceptors will have adequate capacity for projected development through at least 2030 under any of the three AUAR Scenarios. However, ultimate development as projected by Scenarios Two and Three could eventually exceed capacity. If the city chooses to amend its Comprehensive Plan to accommodate components of Scenarios Two or Three, then a subsequent revision to the Comprehensive Sanitary Sewer Plan will be required. The Comprehensive Planning process, including review by the Metropolitan Council, is the appropriate process to resolve any potential sewer capacity issues. Cultural Resources Ten precontact archaeological sites have been recorded in the north and western portions of the AUAR area, and numerous others have been documented in proximity to it (see Table 25 -1). For the most part, sites are located in proximity to water: Centerville Lake, George Watch Lake, Peltier Lake, Rondeau Lake, Clearwater Creek, Hardwood Creek, and Rice Creek. The undisturbed landforms adjacent to these bodies of water have the greatest potential for containing intact archaeological sites. Several sites have been identified on slight rises within the wetlands surrounding Rice Creek; therefore, those wetlands, and the northern portion of Peltier Lake, have high potential to contain intact archaeological resources. Further, those undisturbed areas adjacent to known sites are also considered to have high archaeological potential. Because of the high level of archaeological sites in the AUAR area, appropriate levels of historical and archaeological surveys in areas identified as having high potential for containing cultural resources will occur prior to future development. This is intended to mitigate any intentional or unintentional damage to, xii