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Home My WebLink AboutGrading Plans - 09/19/2018ADVANCED ENGINEERING STRUCTURAL September 18, 2018 Mr. Ed Schneider 324 Park, LLC 1013 Fossil Creek Pkwy Ft. Collins, CO 80525 DRAI NAGE LLC DRAFTI NG Lot 13 Blk 303 Capitol Hill B1803679 Accepted and permit released 9/19/2018 DJM RE: Site Drainage at 324 Park Street, Ft. Collins, Colorado Advanced Engineering, LLC Project Number 3235-01-01B.2 Dear Mr. Schneider: We have consulted with you regarding an addition project that is proposed at the above referenced site. The home is to have a two story addition at the southeast corner, over a basement. A detached garage will be constructed east of the house at a future date. Our office has reviewed the existing and proposed drainage conditions at the site. This review included visual observations, a limited elevation survey, and area calculations. The purpose for this review was to evaluate the impact of the proposed project on existing drainage conditions and to provide a Drainage Plan, Project Number 3235-01-O 1 B. Existing drainage conditions on the site are poor, similar to many hotnes in this area of town. The lot is generally very near flat at the west end, and has a slight slope to the alley at the east end. The site likely experiences ponding in some locations during precipitation events. The neighboring properties to the north and south have generally similar drainage conditions. It does not appear that any substantial flows cross over the property lines. The drainage in the alley is good, with a better than average slope of over 2% to the north adjacent to the property. We measured elevations 20' beyond the north property line in the alley, however we did not feel further survey work was required due to the significant slope which increased down to the north, where runoff is conveyed to Cherry Street. Based on our review of the existing conditions and proposed conditions, we found the follow•ing: 1. Existing impervious area at the site is 962 square feet, 11.3% of the site. 2. New impervious area for addition and patio is 1,176 square feet, 13.9% of the site. 3. Existing plus addition and patio is 25.2% of the site. 4. Future garage and parking pad impervious area is 1,056 square feet, 12.4% of the site. 5. Existing plus addition/patio AND future garage/pad is 37.6% of the site. Our drainage plan indicates that the majority of the increased runoff will be conveyed to the alley via downspouts at the h�use and swales in the back yard, as best possible. The good draina�e conditions in the alley will convey runoff to Cherry Street, similar to the existing runoff conditions. 229 12`h Street SW, Loveland, Colorado 80537 Telephone 970-278-1909 September 18, 2018 Mr. Ed Schneider 324 Park, LLC RE: Site Drainage at 324 Park Street, Ft. Collins, Colorado Advai�ced Engineering, LLC Project Number 3235-01-OlB.2 Page 2 of 2 Given these conditions, it is our opinion the existing drainage will not be significantly impacted and will continue to function as it has historically, with minimal impact on the adjacent sites from the proposed construction. The recommendations and conclusions presented in this letter are based on a review of portions of the described site/structures, your plans and your directions. Our review was limited to the items described in this letter, and is not intended to cover structural, mechanical, electrical, environmental, mold, or architectural features of the site/buildings. Discrepancies or deficiencies revealed during construction should be brought to the attention of the engineer. Thank you for the opportunity to serve you. If you have any questions, please feel free to call. Sincerely, ��:,�;.��t;' � � - � � titi��i��, ,.. .; J,, 4 i i'Z F(��'��ii��i Advanced Engineering, ��,.C��;`o-• ' • •. 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