5A - Conditional Use Permit for the RV Resort Village at the Preserve (continued)

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r MEMO gMiTH Date: April 11,2006 OLTING To: Dan Helbling From: Mark Hallan Cc: Dave Reese,TfitM Ore Brian Ross Project Name: RV Resort Village at the Preserve Project No.: 0158B0001 Subject: Wastewater Flows and Strengths-Revision 2/23/06 Memo This memo dated April 11, 2006 is a copy of the original February 23, 2006 memo that has been updated to reflect the current proposed facilities and layout. This memo reviews the basis of design for the project's wastewater treatment system. The proposed RV resort village will contain 157 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 for the first year or two but then connected to the new treatment system. This structure may be occupied on a year-round basis but the sanitary sewer and water systems serving the resort will not operate over the winter period. Therefore,once this unit is connected to the new system the sanitary sewer service piping will be arranged to allow usage of a holding tank during the winter months. In addition to the 157 lots, the resort will have 4 laundry/shower/shelter buildings and an office/entrance gate building. Each of the laundry/shower/shelter buildings will contain two cloths washers, mens and womens bathrooms with two showers,two sinks and two water closets each. The mens area may utilize one urinal in place of one of the water closets. 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 60 gallons per person per day will be used for design. Utilizing an average occupancy of 2 persons per lot, the daily wastewater flow would be 120 gallons per day for each of the 157 lots, or 18,880 gpd total. As noted four buildings are proposed to house laundry facilities for use by resort lot owners and restrooms with showers for use by resort owner guests. Laundry facility water use is estimated at 2,250 gpd,which is based on 2 wash loads per week for each lot at 50 gallons per wash cycle. Note that Table 3-3 in the EPA manual indicates that 15 gallons per person per day is related to clothes washing in the average flow of 70 gallons per person per day. The figure of 60 gallons per day provided for some laundry water from the RV sites. How water usage for laundry events will be J:\158-Helbling\001-HelblingRVsiw\Cormsp\Lettm\dh041106-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 ENVIRONMENTAI CFRVIC' FC ee/FF