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Home My WebLink AboutFile Documents.711 E Cooper Ave.0115.2018 (4).ACBK4/22/2019 April 15, 2019 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970)704-0311• Fax (970)704-0313 S OPRIS E NGINEERING • LLC civil consultants PJ Murray City of Aspen Engineering Department 130 South Galena Street Aspen, CO 81611 pj.murray@cityofaspen.com RE: 711 E. Cooper – Aspen City Market – Permit Comments – Civil Engineering Response Letter (SE Job #18080) Dear PJ, Please see below for responses by Sopris Engineering, LLC (SE) to the COA Engineering Department comments on the 711 E. Cooper Ave Building Permit submittal. PLAN SET. 711 E. COOPER AVE. 2018.10.08.PDF (17) ENGINEERING COMMENTS  Page: 1 of 2 ALTA PJM Comment: Tie to two COA GPS monuments. SE Response: The survey is showing ties to two COA GPS monuments. See sheet 1 of the ISP.  Page: C1.0 COVER & GENERAL NOTES PJM Comment: Include note that all asphalt patches shall be t top patches. SE Response: Note 19 was added to the Cover Sheet C1.0 and a detail is shown on the Detail Sheet C1.6.  Page: C1.1 SITE DEMOLITION PLAN PJM Comment: What is the interim for the drainage? SE Response: Please refer to CMP provided by the contractor for the interim drainage plan.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: 7ft SE Response: The correct dimension from the edge of the 24-inch light pole base to the edge of the wood furniture is 7.2ft. See dimension shown on Sheet C1.2 and on section 10-10 on Sheet C1.3.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: A revocable permanent encroachment will be required for the modular furniture in the ROW. This will be required prior to issuance of a letter of completion/CO. SE Response: A revocable permanent encroachment will be prepared before letter of completion/CO. 4/22/2019 711 E Cooper Ave – Building Permit Comment Response Letter, SE Job #18080 April 15, 2019 Page 2 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970)704-0311• Fax (970)704-0313 S OPRIS E NGINEERING • LLC civil consultants  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Is there room to provide a curb head rather than have the radius flat to protect the street light? SE Response: A curb head has been added. See sheet C1.2, section 10 on sheet C1.3, and detail on sheet C1.6.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Proposed pipe in ROW will require a revocable permanent encroachment prior to letter of completion. SE Response: A revocable permanent encroachment will be prepared before letter of completion/CO.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Provide a curb head at the apex of the corner in between the ADA ramps to protect street light. SE Response: A curb head has been added. See sheet C1.2, section 10 on sheet C1.3, and detail on sheet C1.6.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Provide a drainage narrative for this project that addresses how drainage will work under the proposed conditions. Include sizing calculations for the new inlets and pipes. SE Response: It was SE’s understanding in pre-design meetings and coordination with the COA Engineering Department that a drainage report/narrative would not be required for this project and that the existing curb inlet has the necessary capacity to handle flows that are tributary to the inlet. Proposed drainage patterns and flows being conveyed to the proposed dual grate replacement inlet are not changing from the existing conditions. The weir and orifice equations were analyzed to review the capacities of the existing inlet versus the proposed dual inlet to verify that the proposed dual inlet meets or exceeds the existing inlet capacity. Assuming 6 inches of depth and applying the necessary clogging factors from the URMP section 4.7.3, the proposed dual grate inlet has greater capacity than the existing curb inlet. The existing curb inlet capacity, based on the weir equation and a clogging factor of 0.12 applied, is 5.18 cfs. Weir Equation: Q = C*L*h^1.5 Where: Q = Runoff Flow Rate (cfs) C = Discharge Coefficient (3.33) L = Length of weir (ft) h = Head (ft) Q = (3.33) x (5.0 ft) x (0.5 ft)^1.5 = 5.89 cfs x 0.88 = 5.18 cfs 4/22/2019 711 E Cooper Ave – Building Permit Comment Response Letter, SE Job #18080 April 15, 2019 Page 3 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970)704-0311• Fax (970)704-0313 S OPRIS E NGINEERING • LLC civil consultants The proposed dual grate inlet capacity, based on the orifice equation and a clogging factor of 0.38 applied, is 7.39 cfs. Orifice Equation: Q = C*A*SQRT(2*g*h) Where: Q = Runoff Flow Rate (cfs) C = Runoff Coefficient (0.6) A = Open Area of Drain (sf) g = Gravitational Constant (32.2 ft/s^2) h = Head (ft) Q = (0.6) x (3.5 SF) x SQRT(2 x 32.2 x 0.5 ft) = 11.92 cfs x 0.62 = 7.39 cfs  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Show the proposed pipe from the parking lot connecting to the storm inlet. How does this new inlet tie into the existing storm main in the ROW? Se Response: The proposed 8” PVC pipe is already shown on the plans and is called out and labeled. The existing 15” storm pipe will be fitted into the proposed inlet as shown. See sheet C1.2.  Page: C1.3 CROSS SECTIONS PJM Comment: Cross section 22 shows bike parking on the site plan. Revise for consistency. SE Response: Vehicles were removed from sections 21 and 22 on sheet C1.3  Page: C1.3 CROSS SECTIONS PJM Comment: Ensure bike parking meets ABPA (American Bike and Pedestrian Association) requirements for bike parking dimensions. SE Response: Bike parking has been adjusted as necessary to meet ABPA dimensional requirements. See landscape plans for details  Page: C1.3 CROSS SECTIONS PJM Comment: Site plan calls out 7.4’ width and my measurement shows 7’ width. Revise for consistency. SE Response: The correct dimension from the edge of the 24-inch light pole base to the edge of the wood furniture is 7.2ft. See dimension shown on Sheet C1.2 and on section 10-10 on Sheet C1.3.  Page: C1.3 CROSS SECTIONS PJM Comment: Will the negative slope cause ponding/drainage issue? SE Response: No, positive drainage is to the north. Additional slope labels added for clarification on sheet C1.2. 4/22/2019 711 E Cooper Ave – Building Permit Comment Response Letter, SE Job #18080 April 15, 2019 Page 4 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970)704-0311• Fax (970)704-0313 S OPRIS E NGINEERING • LLC civil consultants  Page: C1.4 UTILITY PLAN PJM Comment: Have utility locates been called in for this electric line? SE Response: Utility locates were called in and additional survey information was collected. Sheet C1.4 has been revised to reflect the additional survey information.  Page: C1.5 SITE DETAILS PJM Comment: Since this wall is greater than 4’, it will require a design by a structural engineer for Building Department to review. SE Response: See attached letter and detail drafted and stamped by Bob Oddo of Oddo Engineering. The wall design has been verified by Oddo Engineering and the detail has been revised on sheet C1.5.  Page: C1.6 SITE DETAILS PJM Comment: Provide curb head at the corner to protect the street light. SE Response: A curb head has been added. See sheet C1.2, section 10 on sheet C1.3, and detail on sheet C1.6. PLAN SET. 711 E. COOPER AVE. 2018.10.08.PDF (4) BUILDING COMMENTS  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Will there be any snowmelt? If so provide drawings and a CREMP worksheet. SE Response: There will not be any snowmelt.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: One of the parking spaces must be a van accessible space. (2015 IBC 1106.5). This requires an 11’ wide space or 8’ wide access aisle per ICC A117.1-2009 section 502.2. SE Response: The accessible space on the north side of the parking lot has been revised to meet the requirements of a van accessible space. In order to add the additional width required, the three spaces furthest to the west in the north parking aisle have been designed as compact car spaces. See revisions in landscape plans, sheets L200 and L300.  Page: C1.2 GRADING, DRAINAGE AND EROSION CONTROL PJM Comment: Please consider Wheel stops to help keep the accessible route from the public way clear. SE Response: The client does not want to install wheel stops due to the maintenance and the trouble they cause in the winter with plowing the parking lot. The striping of the lanes is consistent with the parking lot for the City Market in El Jebel which has shown to work well. 4/22/2019 711 E Cooper Ave – Building Permit Comment Response Letter, SE Job #18080 April 15, 2019 Page 5 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970)704-0311• Fax (970)704-0313 S OPRIS E NGINEERING • LLC civil consultants  Page: G0.1 COVER SHEET & DRAWING INDEX PJM Comment: Revise to 2017 NEC. SE Response: N/A Not civil scope. If you have any questions or need any additional information, please call (970) 704-0311. Sincerely, Sopris Engineering, LLC Kyle Sanderson, PE Project Engineer 4/22/2019 4/22/2019 28085 04/15/2019 4/22/2019 28085 04/15/2019 4/22/2019