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HomeMy WebLinkAboutFile Documents.517 Park Cir.0161.2018 (13).ARBK FROARING FORK j ENGINEERING From: Drew Wharton Roaring Fork Engineering 592 Highway 133 Carbondale, CO 81623 Danny Stewart Roaring Fork Engineering 592 Highway 133 Carbondale, CO 81623 To: Justin Foreman Civil Engineer City of Aspen Engineering Department 130 S. Galena Street 517 Park Circle Comment Responses Permit Number: 061.2018 July 27, 2018 Justin, Included in this document are the comments and corrections made by the City of Aspen's Engineering Department. In green,below each comment, is a written response to the comment from Roaring Fork Engineering. These responses explain the alterations to the proposed design for conformance to the state and local codes. Adjustments to the plans,calculations, and drainage report are all described in the responses.All alterations done in the drainage report are highlighted. 1. Please add general note for contractor to call in inspection to Engineering Department of structural stormwater BMPs prior to backfill to ensure proper installation. • General note provided. Cl 2. This layout will require removal of concrete curb&gutter. Please provide lengths. • Utilities have been rerouted. Demolition plan revised to sow all removed material. C3 3. Boulders should not be placed in the ROW as they are not traffic rated by AASHTO. Please remove boulders from ROW. • Per Section 4.2.9 Clear Zone of the City of Aspen Engineering Design Standards,clear zone is only designated by the city in sections of road with no curb and gutter. The design standards leave all other design to be evaluated by AASHTO standards.According to AASHTO Roadside Design Guide Section 10-1, obstacles located on the inside of a curve should be located a minimum of 4 feet from the edge of travel lane.With a 5-foot-wide sidewalk,this design is in accordance with AASHTO recommendations. This design was required due to the requirement by DRC review to protect the trees located behind this boulder wall. 4. What slopes in green space area leading to catch basin? • Slopes provided. C8 5. Please provide legend for each paver detail. Additionally,please update sheet L3.00 for coordination. • Paver legend is located on Notes and Legend sheet. Cl 6. No downspout information could be found. Please provide information,details,locations and if connecting to underground storm system. • Downspout locations provided. Storm system design revised. C8 RECEIVED 07/27/18 ASPEN BUILDING DEPARTMENT a517 Park Circle Comment Responses July 27, 2018 Page 2 of 2 7. Provide slopes in green space between sidewalk&curb/gutter. • Slopes Provided. C8 8. Pothole to verify exact depth of existing water line. Provide updated profile of sewer. Must be 18 inches of separation. Encasement maybe required. • Waterline depth field verified. Sewer design revised to meet standards. C11 9. Please provide overlay of utilities and landscape plantings to ensure future utility maintenance accounts proper tree separation. • Landscape plan shown on utility Plan. C12 10. Please provide type of water service line material. • Copper water service line called out. C12 11. Common trench detail not found, Provide detail. Ensure with utility providers that adequate separation is met.Additionally,please provide how slopes will be stabilized during and after construction. Special stabilization methods may be required due to the steepness of the slop these utilities are shown going through. • Typical utility trench section provided. Utility design revised,no longer located within roadside slope. C12 12. Please add note that new water service must be at least 18 inches from any existing water line feature (tap, bend, fitting, etc.). • Note added. C12 13. Please add note that work within City Right-of-Way will need ROW Permit and work must be done in shoulder seasons(April/May, Sept/Oct.)due to the amount of bus traffic on Park Circle. • Note provided. C12 14. It does not appear that any drywells should have grated lids,please mark appropriately. • Detail revised. C14 15. Remove detail not required. • Detail removed. C 15 16. Per section 3.6 and figure 3.10 in the new Smuggler Hunter Mudflow Masterplan,this property is no longer in a mudflow hazard area. Submit a variance to request that this property be reviewed under the new mudflow masterplan instead of the current mudflow section in the URMP. If this property is reviewed under the current URMP mudflow section,mudflow mitigation would be required to protect this property. • Variance submitted with submittal. 17. Provide maintenance of Contech system and level spreader. • Maintenance plan added to Drainage Report. Appendices Feel free to contact me if you have any questions about the responses to your comments. Sincerely, Drew Wharton Roaring Fork Engineering dreww@rfeng.biz RECEIVED 07/27/18 ASPEN BUILDING DEPARTMENT From: Parker Lathrop<parker.lathrop@aspenfire.com> Sent: Monday,July 23, 2018 11:41 AM To: Danny Stewart<dannys@rfeng.biz> Subject: Re: 517 Park Circle Letter I was able to review the plans for 517 Park Circle and found that all appropriate measures have been incorporated to mitigate the concerns of Aspen Fire. I understand that final design may change slightly as unforeseen challenges arise and ask that Aspen Fire be consulted on changes that may affect our response.Thank you for reaching out and being proactive about our concerns. Parker Lathrop Deputy Chief/ Fire Marshal Aspen Fire Protection District 420 E Hopkins Ave Aspen, Colo 81611 970.925.5532 Please do not print this e-mail unless you really need to. Under Colorado's Open Records Act (CORA) , all e-mails sent by or to us on this District-owned e-mail account may be subject to public disclosure. PRIVACY NOTICE -- This electronic message transmission contains information from the Aspen Fire Protection District that may be confidential or privileged. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is prohibited. If you have received this communication in error, please notify us immediately, and please delete the original message. RECEIVED 1 07/27/18 ASPEN BUILDING DEPARTMENT ROARING FORK -wife ENGINEERING From: Drew Wharton Project Engineer Roaring Fork Engineering (970)340-4130 dreww@rfeng.biz To: Justin Foreman Senior Project Manager City of Aspen Engineering Department (970)429-2783 517 Park Circle Variance Request Permit Number: 0161.2018 July 17,2018 Justin, I am requesting a variance for 517 Park Circle regarding the mudflow analysis. The current URMP states that the site would require a mudflow analysis.As per comment from Justin Forman dated June 6, 2018, a new Smuggler hunter Mudflow Analysis was conducted and the site is no longer located within the mudflow zone. This proposed variance is requesting that the project does not follow the current mudlow analysis requirement, and instead follows the more recent analysis. Criteria from which the applicant seeks a variance. As shown on Figure 7.1b—Smuggler Mountain Mudflow Zones in the current URMP (rev 11/2014),the site is within 200' of a slope greater than 30%. This would require the applicant to submit a 100-year mudflow event analysis. From the updated Smuggler Hunter Mudflow Masterplan, dated January 9th, 2015, Figure 3.4, Potential Geological Hazards,the site under evaluation is no longer in or below a potential unstable slope. This more recent analysis would exempt this site from a mudflow analysis. Justification for not complying with the criteria The updated Smuggler Hunter Mudflow Masterplan is a more recent and accurate analysis of the Neale Avenue and Oklahoma Flats Basin.A mudflow analysis is not required with the site not located in a mudflow hazard zone. Supporting Documentations Figure 7.1b—Smuggler Hunter Mudflow Zones,Page 7-7 of the City of Aspen URMP, 11-2014 Figure 3.4—Potential Geological Hazards of the Aspen Smuggler Hunter Mudflow Masterplan Potential adverse impacts for proposed variance and alternate criteria on downstream water bodies public and private. RECEIVED 07/27/18 ASPEN BUILDING DEPARTMENT �� 517 Park Circle Variance Request July 17, 2018 Page 2 of 2 Due to the site not being located in a mudflow hazard zone,there would be no adverse effects. Please call with any questions, I look forward to your response. Drew Wharton RECEIVED 07/27/18 ASPEN BUILDING DEPARTMENT City of Aspen Urban Runoff Management Plan N„__r', SMUGGLER MUD FLOW ZONES Legend Areas o n o r within ZONES fe et of —H ski IAII ®slo pe greater than 309E Structures Areas south of Durant St located Roads within the 2 ft mutlow depth on the 100 year mu dpl ain map _Water (see master plan) M City ofAspen®Slop reater than 30% 0 206 Feet Tha map/draNingrimage's a graphical representation of the features depicted and is not a legal representation. The accuracy may change depending onlhe enlargeme nt or reduction. 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Figure 7.1 b—Smuggler Mountain Mudflow Zones RECEIVED Chapter 7—Mudflow Analysis 7-7 Rev 11/2014 7 2 7 1$ ASPEN BUILDING DEPARTMENT — ,0,---it____\_ I / /7 ______, ' ' -_ yriLOPIIIIIIIP— VII / e / 8g000 �; 'po _�� y�o, / 7/ -------1----„,-------12-1-9900- , lilt ni o 99004.+4*V 4v4 A." - ' ' ' • I '•—•A'•A .49- / 7A 1 < . 4.♦�♦*6r4.♦*4 tee ♦♦♦♦♦♦♦♦♦♦♦♦♦♦�i4,0 o wz ,♦ �ote `♦♦♦� Hunter Creek Basin ao _ ♦ o ♦ ♦ o Hallam Lake t:+0♦♦♦;!'4 v�♦♦�♦4 ♦4♦-♦t���. �/ A o o 111116. *' v Gibson Avenue Basi/or 4..":"/ 0/ ,I 9400 Wp.'NG Hunter Creek Basin � �I Z ♦♦ � 11 �- S .•:�Mocklin I -gilt ♦�!♦i�♦♦ . �� �/ Oft \ . ♦A♦♦♦�� 1 o� it ♦♦♦♦' Neale Avenue and OK Flats Basin \ \ \ \ , ) / tatilAty.Liiiii :off f Sr • '1.It''1 2 L��O EFK787. 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Alluvial Fans Glacial Drift N Ditch,Open -•�� _ Flood Plains Granite s _ Major Basins THE CITY OF ASPEN WA Potential Unstable Slopes Gravel o t,000 P O T E a, Topographic Contour Limestone Feet �'''�� IVE D (feet NGVD29) Source:U.S.Geological Survey ' �' (WRC Engineering Inc.,2001) Shale GEOLOGIC AZAR D S y MS 07/27/18 3.4 ASPEN BUILDING DEPARTMENT