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<br /> <br />TST. INC. CONSULTING ENGINEERS <br /> <br />R~Ci:.1Vr-:\DI <br />St.\' 0 2. 2005 <br /> <br />August 30, 2005 <br /> <br />ColoradO Water Conservation Board <br /> <br />Mr. Tom Browning. PE <br />Colorado Water Conservation Board <br />1313 Sherman Street, Rm 721 <br />Denver, CO 80203 <br /> <br />RE: Wilson Ranch - Little Thompson River Hydrologic Study <br />Project No_ 0972.0013.02 <br /> <br />Dear Mr. Browning: <br /> <br />Recent communications between our office, yours, and your consultant (HDR) <br />related to the rainfall data have resulted in an impasse regarding completion of <br />the work. The Wilson Ranch project in Berthoud that we are working on has <br />progressed to a point that we must move forward. I know that you are also eager <br />to have this work completed to assist Larimer and Boulder counties with their <br />map update program. We would like to offer the following solution: <br /> <br />1. TST would need to get electronic files of the raw rainfall gauge data <br />collected by HDR within the study area. We would like the information for <br />both the USGS rain gauges and for any others that might be available <br />from local governments. We would like the 15 minute data but can use <br />the 5 minute data if that is all that is available. We already have the <br />gauge locations for the USGS stations but would also need coordinates <br />for the supplemental gauges. <br /> <br />2_ The original scope of services called for rainfall coverage for the 10. 50. <br />100, and 500 year event storms. We have the thunderstorm event (5- <br />hour) coverage for only the 100 and 500 year event from HDR. We still <br />need HDR to provide the 10 and 50 year coverage. It is assumed that <br />only the thunderstorm event will be used in the hydrologic modeling and <br />that the "calibration" storm referred to in the previous HDR <br />communications has been dropped. <br /> <br />3. TST will use this data to complete the rainfall component of the scope <br />and then incorporate it into our HEC-HMS model. In exchange for this <br />additional work CWCB will agree to reimburse TST for $5,000 of this <br />effort_ The Wilson Ranch development will absorb the remainder of the <br />cost of the work. <br /> <br />748 Whalers Way. Bldg, D <br />Fort Collins, CO 80525 <br />970_226_0557 <br />metro 303.595.9103 <br />fax 970.226.0204 <br /> <br />Our team will be ready to re-engage on this project on Monday September 12. If <br />you can have the information requested above sent to us by then we can <br />complete our work. We anticipate the remainder of the tasks left to us will take <br /> <br />info@tstinc.com <br />www.tstine.com <br /> <br />. <br />