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

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MEMO January 16,2007 Page 2 of 3 value was reduced based from the 60 gallons per person figure based on further review of typical peak weekend flows seen at other facilites within Crow Wing County. Utilizing an average occupancy of 2 persons per lot, the daily wastewater flow would be 110 gallons per day for each of the 168 lots, or 18,480 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 2,400 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. How water usage for laundry events will be spaced out over the week is an unknown. However, it would be expected that during peak weekend occupancy with guests being entertained laundry water use would be below average with most of this water usage during the week. Restroom and shower water usage in the four buildings will be directly related to the guests that are visiting for a day or weekend. With 168 sites it is estimated that 25% ('/a or 42 units) would have 2 to 4 guests visiting at any given time. With an average of 3 guests a total of 126 guests would be utilizing the restroom and shower facilities on any given day. At 20 gallons per day for each guest the wastewater flows would be 2,520 gallons. This figure provides for 252 (2 per person)water closet flushes (1.5 gallons per flush),252 hand washing events (1/2 gallon each wash) and 80 -ten minute showers at 2.5 gpm shower head water usage rate. Clubhouse wastewater flows will be comprised from a variety of activities. The community room with warming kitchen flows are based on cycling two meal events at 50 person per meal for a total of 100 meals at 2.5 gallons per meal or 250 gpd. Lounge area is shown to have seating for 35 persons that would be utilized over a day. Utilizing 20 gallons per day per seat provides a flow of 700 gallons per day. Note: Published data shows figures in the.30 to 35 gallon per day per seat under a"lounge definition". However this area of the clubhouse should be used more as a gathering or gaming area and the 20 gallon per day figure is more in line with this type of facility. Exercise room are is proposed to have one shower in each locker room. Flows for this area are estimated at 450 gpd based on 30 persons at 15 gpd per person for water use. Total wastewater flow for the clubhouse is 1,400 gpd. The collection system will utilize a 1,000 septic tank to receive flows from the warming kitchen area as a grease and large solids trap. The plumbing layout for this building shall utilize separate drain system for the warming kitchen from the rest and locker room areas. The entrance building will house a couple of offices with restroom. A flow of 50 gpd will be used for this building which allows for 3 or 4 employees over a 24 hour period. Average Daily Design Flow=24,850 gallons (18,480 +2,400+2,520+50 + 1,400) This average daily flow is expected to occur over a 16-hour period. Treatment plant manufacturers will require diurnal flow equalization with a tank capacity around one third of the daily average flow or 8,300 gallons. The current design has an 8,600 gallon capacity(5.5' x 1,564 gallons per foot) between the float elevations of 1247.5' and 1253.0' in the 10,000 gallon dosing tank as shown on sheet 11. No changes are required for the preliminary or dosing tank sizes.