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09/10/2019 MINUTES 1 <br />COMMISSIONERS' MINUTES <br />KITTITAS COUNTY, WASHINGTON <br />COMMISSIONERS CONFERENCE ROOM (MOVED TO AUDITORIUM) <br />SPECIAL MEETING <br /> <br />TUESDAY 1:00 P.M. SEPTEMBER 10, 2019 <br /> <br />Board members present: Chairman Cory Wright; Vice-Chairman Brett <br />Wachsmith and Commissioner Laura Osiadacz. <br /> <br />Others: Mandy Buchholz, Deputy Clerk of the Board II; Mark Cook, <br />Public Works Director/Interim County Engineer; Jennifer Reiner, PE <br />Senior Land Acquisition Project Manager and 9 members of the public. <br /> <br />SPECIAL MEETING BLACKHORSE DEVELOPMENT UPDATE COMMISSIONERS <br /> <br />At 1:00 p.m. Chairman Wright opened a Special Meeting to receive an <br />update from the Blackhorse Development Project Manager and County <br />Staff. <br /> <br />Chairman Wright disclosed that if the Board will allow it he would <br />like to listen in on today’s meeting as it’s only a briefing with no <br />action. He stated as things move forward he will recuse himself from <br />any future meetings where action is being requested on the topic. <br /> <br />Mark Cook, Public Works Director/Interim County Engineer stated that <br />today’s meeting will only be an update and that no action is being <br />sought. He gave the Board a brief history on the Black Horse project <br />at Whiskey Creek flooding/stormwater. He explained that for the past <br />several years Public Works has been working with DR Horton, private <br />land owners and the WSDFW as well as the Ellensburg Water Company to <br />identify a flood solution resulting from pending installation of an <br />eighteen foot box culvert under Bender Road replacing the existing <br />48 metal culverts. He stated that the Flood Control Zone Dist., has <br />spent the past two years developing a two-dimensional flow model <br />that is in the final stage of FEMA acceptance for regulatory <br />remapping area floodplain and the flow model has been used to text <br />various flood alleviation alternatives at Black Horse. The most <br />recent attempt at restoring area conveyance centers on the creation <br />of a new flood channel parallel to Bender Road along the easterly <br />edge of the plat and for the past several years, DR Horton has been <br />working to remedy failed onsite stormwater facilities; high <br />groundwater and leaky stormwater conveyance systems are the most <br />likely contributing agents. He stated that DR Horton recognizing the <br />long term impact of seasonally high groundwater, and they are <br />electing to redesign the onsite stormwater ponds to “evaporation” <br />ponds. He stated that the decision requires more land for open water <br />storage and the bottoms of existing ponds are being raised to gain <br />separation from water table elevation. He stated that they are