4A - Amendment to the Conditional Use Permit for the RV Resort Village at the Preserve

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MEMO WIDSETH SMITH Date: January 16,2007 NOLTING To: Dan Helbling From: Mark Hallan Cc: Tim Moore,Charles Marohn Project Name: RV Resort Village at the Preserve Project No.: 0158B0001 Subject: Wastewater Flows and Strengths This memo dated January 16, 2007 replaces the April 11, 2006 and February 23, 2006 memos. The proposed RV Resort preliminary plat is being revised to reflect changes associated with additional land acquisition. The number of lots has increased to 168 and a clubhouse (6130 square feet) has been added with community room, warming kitchen, lounge area, exercise room, locker rooms, rest -- rooms, storage and mechanical rooms. During 2006 reviews of wastewater flows for other projects where completed. These included the CORPS campground in Crosslake and other facilities in Crow Wing County. In addition, a meeting was held with MPCA staff on how they review flow design figures with respect to the NPDES permit that is issued for facilities with flows greater than 10,000 gpd. This memo reviews the basis of design for the project's wastewater treatment system. The proposed RV resort village will contain 168 lots (5,000 square feet each) for which seasonal water and sanitary sewer service will be provided. Lot owners in the resort may occupy their site anytime during the proposed operational season of April through October. There will be no occupancy of units/lots during the winter season of November through March. It is anticipated that lots will typically be occupied from mid May through mid September. The proposed resort manager's residence will remain connected to the existing septic treatment system as this facility may be used year round and therefore must utilize an ISTS system. In addition to the 168 lots,the resort will have 4 laundry/shower/shelter buildings, a clubhouse and an office/entrance gate building. The laundry/shower/shelter buildings are 1,024 square feet in size and contain two cloths washers, mens and womens bathrooms with two showers, two sinks and two water closets each. The mens restroom will utilize one urinal in place of one of the water closets. Office/entrance building will contain a single restroom and area for coffee maker,microwave and wash sink. Club house has a community room with seating for 60 to 70 people depending on table arrangements,warming kitchen with preparation area, lounge area with seating for 35 people, office and reception rooms, exercise room and associated locker/restrooms. EPA Onsite Wastewater Treatment Systems manual (EPA/625/R-00/008) and Tennessee Valley Marina and Campground Wastewater Characterization Screening Study documents were reviewed to characterize the wastewater flows and strengths. The referenced EPA manual (Tables 3-1 and 3-2) provides data on average daily wastewater flows and water usage. Mean (average)water use per person is 70 gallons per day with a median water use of 60 gallons per day per person from these tables. These values include 8 to 9 gallons per day for leaks in plumbing, fixtures and appliances. Systems in the RV units should be fairly leak-free and the number of bedrooms/bathrooms will be similar to a smaller home. A value of 55 gallons per person per day will be used for design. This J:\158 HELBLING\001-HelblingR Vsite\Corresp\Letters\dh011607-MEMO.doc 7804 Industrial Park Road■PO Box 2720• Baxter,MN 56425-2720•TEL:218.829.51 17■FAx:218.829.2517■WEB:www.wsn-mn.com ENGINEERING ARCHITECTURE LAND SURVEYING ENVIRONMENTAL SERVICES AA/EEO