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Peterson & Marquis Law Office <br /> 1227 First Street <br /> <br /> September 8, 2017 <br />Wenatchee, WA 98801 <br /> <br />Bill Cowan e-delivery <br /> <br />Re: Vantage Bay Water Budget <br /> <br />Dear Mr. Cowan, <br /> <br />You have asked us to opine on the sufficiency of the water rights that you have to execute <br />a development of the Vantage Bay property. We are providing you with quantity <br />estimates for various types of use so that if you change the mixture of these uses you will <br />be able to evaluate the relative impacts in a water budget. <br /> <br />Water Sources <br /> <br />: <br />Certificate 73029: 50.5 acre-feet (19 consumptive) at 158 GPM <br />Certificate 23192: 39.3 acre-feet (33.4 consumptive) at 99 GPM <br />Total: 89.8 acre feet (52.4 consumptive) <br /> <br />Consumptive use is use that does not return water to the aquifer or to the River. As an <br />example: irrigation applications are expected to consume 85%i <br /> <br /> of the water pumped <br />where potable uses typically consume less than 15%. <br />Overview <br /> <br />: <br />The Vantage Bay development plan seeks to connect 145 single family lots, a club house <br />(with pool), communal barn, a winery and a 40-unit condominium to its water system <br />supported by the above water right certificates. Any remaining water could be allocated <br />towards the development and maintenance of communal outdoor use (community garden <br />and public landscaping) and a 16-acre vineyard. <br /> <br />Assumptions <br /> <br />: <br />- A single ERU (Equivalent Residential Unit) is calculated at 200 gallons per dayii <br />- For purposes of this study it is assumed that potable uses are typically returned to <br />the sub soil at a rate of approximately 85%. <br />. <br />- One acre of vineyards requires 31.92 inches of water per irrigation season (May- <br />October)iii. This number will be higher due to application efficiencies of the water <br />delivery system. For example: if the vineyard used Solid-Set: Undertree Sprinkler <br />systems the application efficiency would be on average 75%iv <br />- Lawn and public spaces will be considered pasture/turf irrigated by pup-up impact <br />sprinkler systems for the following calculations. These areas will be irrigated <br />. This would <br />increase irrigation demands to 39.9 inches per acre or 3.33 acre-feet per season. <br />Index #7