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Royal Gorge Water Plans - May 2007

These documents detail how much water the consultant says the new development will require (~235 acre-feet per year, compared to the 110-120 AFY currently used by Serene Lakes) and how this water could be provisioned by SLCWD. The documents include a quantitative analysis of the water demand, including a breakdown of the number and types of units in the proposed development (286 single family, 724 condos, and additional shared facilities). The analysis attempts a conservative estimate of the water needs based on a 46% occupancy rate.

Royal Gorge proposes that the primary source of water will be surface water from Ice Lakes. The documents confirm that the drilling sites did "not locate groundwater or were drilled into areas considered to be of very low potential productivity" and that, as a result, "groundwater supply identified by the exploratory drilling was deemed infeasible." Royal Gorge proposes building a new water treatment facility for SLCWD and dredging about half of the Ice Lakes perimeter.

More information on Royal Gorge LLC. plans has become available in January 2008 as part of preliminary design documents.

Cover Letter

Wade Freedle, President
Board of Directors
Sierra Lakes County Water District (SLCWD)
P.O. Box 1039
Soda Springs, CA 95728-1039

Dear President Freedle and SLCWD Board Members:

As you requested, Royal Gorge has assembled information concerning our water needs, as well as a description of some potential alternatives for meeting those needs.

Attached are two memoranda prepared by consulting engineers CDM. The first provides an estimate of water demand, based upon the proposed Royal Gorge development plan. The second memo describes alternatives for meeting those needs.

Our desire is to work closely with SLCWD to develop a solid plan to meet Royal Gorge's water needs while at the same time benefiting existing SLCWD customers and ensuring that the lakes remain the recreational jewel of the Serene Lakes community.

I would like to summarize several relevant points contained in the attached memos:

Demand:

The estimated Royal Gorge water demand of 235 acre-feet per year (AFY) is based upon a 46 percent occupancy rate greater than Serene Lakes' average and on par with recent relevant mountain resort projects in eastern Placer County.
• SLCWD's state water rights permit no. 14248 grants the district rights to 1,177 AFY of water for direct storage, and approximately 110-120 AFY is used today. Supplying Royal Gorge water needs would place the district at about 355 AFY, well below its permitted rights.

Supply:

• The second memo outlines alternatives for meeting Royal Gorge water demand through combinations of surface water, groundwater and creating additional storage.
• Because organic material is building up and reducing the capacity of Lake Serena, we understand that SLCWD has considered dredging portions of the lake to protect future water supply.
• An alternative described in the second memo would involve dredging a portion of Lake Serena to help the district recapture lake capacity lost to accumulated organic material, and would increase capacity enough to supply Royal Gorge water needs.
• Under this alternative, the current surface area of the lake, even under dry conditions would likely remain the same or larger as it is under current operating conditions. The water supply of the district would be protected for the future, but Royal Gorge would foot the bill instead of existing water district customers'and the lake's recreational role would be protected and enhanced.
• We would propose that water supplied to Royal Gorge be treated at a new water treatment facility, or that SLCWD's existing facility be upgraded.

You will find more detail in the attached memos.

In addition to the information contained in the attached memos, ancillary issues we hope will be part of our discussions include: 1) a proposal to exchange water tank sites for SLCWD's five-acre parcel along Soda Springs Road; and 2) the lake bottom ownership issue, which we understand the Board would like to discuss with us. We look forward to working together to serve Royal Gorge water needs and benefit the District's existing customers.

Sincerely,

Mike Livak
Project Manager

Demand Letter

Memorandum

To: Mike Livak, Royal Gorge
From: Andria Loutsch, Paula Hansen
Date: May 17, 2007
Subject: Royal Gorge -- Estimated Water Demand

Sierra Lakes County Water District (SLCWD) has asked for an estimate of water demand for the Royal Gorge project. SLCWD has also asked for a description of the methodology used to estimate this demand. In response to this request, we have prepared the following summary concerning the water demand estimated for the project and the methodology used to estimate demand.

Estimated Water Demand

Methodology Used for Estimating Water Demand

King used unit water rates developed in Placer County Water Agency's "Water System Facilities Plan for Martis Valley" (April 2001) for different types of residential land uses. The results of the PCWA study were used because this is the most recent and relevant development plan completed in the region. The PCWA study is considered an appropriate source of information for four reasons. First, the PCWA study involves a similar range of residential uses. Second, Martis Valley's climate is very similar to that of the Royal Gorge site. Third, the PCWA study was prepared relatively recently, and the information is considered representative of current conditions and practices. Fourth, both Martis Valley and the Royal Gorge site are located in Placer County; thus, the estimates set forth in the PCWA study are likely to be acceptable to the County for purposes of estimating demand for the Royal Gorge project.

For condominiums, town homes, duplex cabins, and employee housing, the average daily demand is estimated at 300 gallons per day (gpd) per unit. Single family residences are estimated to use 500 gpd per unit.

Table 1 Estimated Water Demand for the Royal Gorge Development
Type of Occupancy	Estimated Average Daily Unit Demand (gpd)	Number of Units		Average Annual Demand (gpd)	Average Annual Demand (AFY)
Single Family Residential	500 gpd/unit	286	units	65,800	74
Condominium, Town Home, Duplex Cabin, Employee Housing Unit	300 gpd/unit	724	units	99,900	112
Headquarters/ Summit Interpretive Center, Old Summit Station	250 gpd/restroom stall	28	stalls	3,200	4
Sales Pavilion & Yurt, Post Office, Library	250 gpd/restroom stall	14	stalls	1,600	2
Commercial/lodging/amenity placeholder				20,700	23
Restaurant	1.8 gpd/sqft	11,000	sqft	9,100	10
Swimming Pools, Ice Rink, Sports Complex, Wellness Center	250 gpd/restroom stall	40	stalls	4,600	5
Playground, Park, Campground, Lakes, Parking Lot Restrooms	250 gpd/restroom stall	28	stalls	3,200	4
Fishing Cabin	300 gpd/unit	1	unit	140	0.2
Lake House				1,100	1
Total Demand				209,340	235

Source: Adapted from King Engineering, May 14, 2007, "Summary of Domestic Water Demands for Royal Gorge Project"

The commercial/retail amenity water demand was developed using water use rates per square foot or per restroom stall for typical uses from a study done by the St. Johns County Utility Department in St. Augustine, Florida (October 2006). There are fewer studies available for reference regarding water use rates for commercial/retail land uses in comparison with residential land use; however, the St. Johns study is comprehensive.

Irrigation demand for lawn and common areas will be minimized by use of native drought tolerant plants and natural landscaping. The estimated demand presented above includes water needed for such uses. Royal Gorge will include low-flow facility design and conservation measures in the operations to the maximum extent feasible.

The estimated average annual demand is provided in gallons per day. This figure represents the average daily demand over the course of the year. This figure has been calculated by multiplying the number of units by the estimated daily demand per unit, multiplied by an initial average daily occupancy rate of 46%. In other words, this estimate assumes that, on average, a total of 46% of all residential units will be occupied over the course of a year. During certain times of the year, occupancy rates will be higher; at other times, occupancy rates will be lower. On average, however, the initial occupancy rate is expected to be 46%. Thus, average daily demand has been estimated by taking into account this initial average occupancy rate. In the last column of Table 1, the average daily demand in gallons per day is translated into average annual demand, expressed in acre-feet per year.²

The 46% initial occupancy rate is somewhat higher than existing use patterns for the Serene Lakes community and Donner Summit Public Utility District service area, which average about 40 percent full-time occupancy. This level is consistent with the 46% initial occupancy rate assumed for two recent Northstar residential/commercial developments approved by Placer County. The Northstar projects are considered appropriate projects for purposes of estimating occupancy rates because these projects also serve as examples of residential units located in a recreational setting in the Tahoe region.

The Royal Gorge initial occupancy rate assumption was used to calculate the 235 AFY total water demand presented in Table 1. Residential water use per unit, taking into account initial occupancy, is 230 gallons per day for single-family residential units and 138 gallons per day for condominium/town home units. The SLCWD existing water use, which is predominantly single family homes, was about 137 gallons per day per unit in 2006. Thus, the estimated residential demand for Royal Gorge for single-family residences at Royal Gorge is approximately 68% higher than it would be if usage were estimated based on existing water use at SLCWD. This higher figure has been used in order to take a conservative approach towards estimating anticipated water demand at Royal Gorge.

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¹ This figure on snowmaking demand was provided by Royal Gorge. CDM has not independently calculated a demand for snowmaking.

² Water demand does fluctuate seasonally, with peak usage in July in this area. Based on SLCWD's records of water use, approximately 70% of SLCWD water use occurs in period of July through February. The remaining 30% occurs March through June. This memo addresses water demand on an annual basis.

Supply Letter

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