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_~ , <br />Applegate <br />' Group, ~~~. <br />May 24, 2005 <br />Mr. David Nettles, PE <br />Division of Water Resources <br />810 9`h Street, 2na Floor <br />Greeley, Colorado 80631 <br />RE; Request for approval of Wellington Downs Reservoir Liner <br />Dear Mr. Nettles: <br />We have completed the 90-day test period for the Wellington Downs Reservoir and offer the <br />following information and supporting data regarding the seepage into the reservoir. <br />The testing period began on February 4, 2005 and ended on May 4, 2005. The Wellington <br />Downs Reservoir is located in Larimer County at the southwest corner of the intersection of <br />Interstate 25 and Harmony Road, north of Lazimer County Road 36 (S3 T6N R68W). A vicinity <br />map has been included. <br />Procedure <br />A rain gage was placed on site and data collection began on February 4, 2005. Precipitation data <br />was also gathered at a nearby weather station. There was a small amount of water remaining on <br />site from previous construction (see attached map). This initial amount of water was estimated <br />from a survey performed directly prior to commencing the test. Readings were taken every few <br />days, specifically after precipitation events. A survey was performed after the 90-day period to <br />determine the final water amount in the reservoir. A water balance equation was applied to the <br />data to determine the amount of water that was seeping into the reservoir. The seepage <br />calculation was then compared with the allowable seepage calculation derived from the equation <br />provided by the state. <br />Data <br />Data was collected for 90 days and is included with this letter. Rain gage readings were taken <br />every few days, and a8er precipitation events. Weather data was collected from a weather <br />station located in southwest Fort Collins neaz the project site. The weather station is located at <br />Lat: N 40° 31' 30" (40.525°), Lon: W 105° 7' 36" (-105.127°), and Elevation: 5100 8. The <br />soWCe for this data is www.weatheruudereround.com/weatherstation/WXDailyHistory.asp~ID=KCOFORTC4. <br />The on-site rain gage data was used in calculating precipitation during this time, the weather <br />1499 West 120th Avenue, Suite 200 (303) 452-6611 • Fax (303) 45~ 2759 <br />Denver, Colorado 80234-2759 www.applegategroup.com <br />