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Ms. Rachel Juba <br />July 7, 2017 <br />Page 2 <br />6. The remaining 0.73 acres of impervious area will be treated with the construction of a new <br />pretreatment and infiltration basin located in the northwest corner of the site. Staff will continue to <br />work with the applicant on the size and location of the stormwater facilities on site and determine if it <br />make sense to expand the existing basin rather than create an additional basin. <br />In the stormwater narrative, the applicant states that rate control for the site will be provided by an <br />existing downstream drainage system. However, the proposed infiltration basin outlets at 2.96 cfs for <br />the 100 -year storm as proposed. The City of Hugo limits the discharge rates to 0.1 cfs/acre of total <br />project size for the 100 -year event. The previously -approved Phase 3 submittal listed an overall <br />project area of roughly 12 acres, which would limit the 100 -year peak flow to 1.20 cfs. As or000sed. <br />the peak flow out of the proposed infiltration basin is not compliant with the City of Hugo's <br />Comprehensive Stormwater Management Plan (Section N.A.16), <br />Wetlands <br />8. No wetland impacts are proposed as part of the Phase 4 improvements. <br />Thank you for the opportunity to provide comments on this project. If you have any questions, please do <br />not hesitate to contact me at 651-286-8463. <br />Sincerely, <br />WSB & Associates, Inc. <br />Mark Erichson, PE <br />City Engineer <br />cc: Steve Duff, Senior Engineering Technician (email only) <br />Stephanie Hatten, Water Resource Engineer (email only) <br />