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171010-SGM Memo-EnclavePrelOnsiteDrainageReport - OK.pdf I:\1991\91004\A\64‐MinorPUD‐EnclaveImprovements\2017‐10‐10‐Memo‐EnclavePrelOnsiteDrainageReport.doc  118 W. 6th St, Ste 200 Glenwood Springs, CO 81601 Phone: 970-945-1004 Fax: 970-945-5948 MEMORANDUM TO: Anne Martens, Public Works Director amartens@tosv.com CC: Ryan Gordon, SGM FROM: Dean Gordon, SGM DATE: October 10, 2017 RE: Enclave Preliminary Onsite Drainage Report I have reviewed the revised Drainage Report from Roaring Fork Engineering, dated September 29, 2017. In that report, they have quantified the impact of the changes in the Enclave site plan on the downstream Base Village drainage facilities. There calculations indicate that the impacts are within the capacity of the 24” diameter storm drain in Upper Wood Road, the 72” interceptor storm drain running through Base Village and the water quality control facilities below Base Village adjacent to Brush Creek. I have briefly reviewed their calculations and find them to be acceptable. Therefore, this drainage report is accepted for the Preliminary Plan application. Even if there are no changes, a subsequent drainage report should be issued with “final” substituted on the title page.