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HomeMy WebLinkAboutFile Documents.975 King St.0043-2020-BRES (31)P.O. Box 3901 Eagle, Colorado 81631 YARNELL CONSULTING & CIVIL DESIGN, LLC (970) 323-7008 · 8/27/2020 229 Midland Ave. Basalt, Colorado 81621 975 King Street (Parcel 3, Boundary Agreement Plat [Book 13, Page 35]) Page 1 of 2 Jack Danneberg City of Aspen Engineering Department 201 N. Mill Street, Suite 101 Aspen, Colorado 81611 Jack.Danneberg@CityOfAspen.com Subject: 975 King Street (Parcel 3, Boundary Agreement Plat [Book 13, Page 35]) Variance Request for Water Service Depth Jack: I have been in discussions and meetings with the city’s engineering and parks departments regarding the redevelopment of 975 King Street (Parcel 3, Boundary Agreement Plat [Book 13, Page 35]). This project requires new wet (sanitary sewer and water) and dry (natural gas, electric, communication, and cable) utilities be constructed within a 20-foot utility easement across an adjacent property (Lot 1). Unfortunately, numerous large trees on Lot 2 immediately adjacent to said easement limit the ability to utilize the full 20-foot-width due to root zones. An extensive quantity of correspondence has occurred between me, city parks, city engineering, and Aspen Consolidated Sanitation District (ACSD) to develop utility designs that strive to accomplish every stakeholder’s requirements. The current horizontal layout reflects these discussions. The depth of the private sanitary sewer main has been maximized based upon the depth of the existing public main in King Street, to which the private main must drain. The depths of the dry utilities are governed by jurisdictional standards. In accordance with Section 3.2.5 of the city’s Water Distribution Standards, water pipes shall be buried with a minimum seven (7) of cover between the top of pipe and finished grade. In an email received from Mike Horvath, I was directed to construct the water services 18 inches above the sanitary sewer main since it is not possible to obtain the requisite 10 feet of horizontal separation. Given the depth of the private sanitary sewer main, this would put approximately 4.25 feet of cover over the water services. Since the water services provide both domestic and fire suppression demands, they are also governed by the International Fire Code which trumps city standards and says water services must be buried at least 12 inches below the frost depth. In Aspen, the frost depth is 48 inches; therefore, the pipes must be buried with 60 inches (5 feet) of cover. Since the cover over the proposed water services is less than that mandated by city standards, I am hereby requesting a variance for this project so that we can follow the city’s request. The following reflect the “Variances” procedure identified within Section 29.01.060 of the City of Aspen Municipal Code. 1. Identify the criteria from which the applicant seeks a variance. Due to the constraints being imposed on this project site and to meet the request of the city’s water department, I am seeking a variance from Section 3.2.5 of the city’s Water Distribution Standards which says water pipes must be buried with a minimum seven (7) feet of cover. P.O. Box 3901 Eagle, Colorado 81631 YARNELL CONSULTING & CIVIL DESIGN, LLC (970) 323-7008 · 8/27/2020 229 Midland Ave. Basalt, Colorado 81621 975 King Street (Parcel 3, Boundary Agreement Plat [Book 13, Page 35]) Page 2 of 2 2. Provide a written justification outlining why the criterion cannot be met. As stated previously, the requisite 10 feet of horizontal separation between water and sewer utilities cannot be accomplished. City staff requested the water services be as high as possible in an effort to be above the sewer utility. The depth is governed by the International Fire Code. 3. Identify an alternate criteria or standard that is proposed to comply with the intent of the criteria from which the variance is sought. I understand the minimum burial depth is an effort to ensure the pipes do not freeze in the cold months of the year. We propose to insulate the pipes where there is less than seven (7) feet of cover to ensure they do not freeze. 4. Provide supporting documentation, including necessary calculations. Typically, one (1) inch of insulation is equivalent to one (1) foot of soil cover. We are proposing not less than two (2) inches of insulation to account for the two (2) feet of reduction in soil cover. 5. Provide an explanation of any potential adverse impacts of the proposed variance to adjacent landowners. I do not foresee adverse impacts of this construction for adjacent landowners. I appreciate your understanding of the difficult constraints imposed by this site and your willingness to grant this variance request so we might meet the water department’s request for construction. Do let me know if you have any questions. Sincerely, Justin J. Yarnell, PE Colorado PE Number 47241 Reviewed by Engineering 12/17/2020 1:40:40 PM "It should be known that this review shall not relieve the applicant of their responsibility to comply with the requirements of the City of Aspen. The review and approval by the City is offered only to assist the applicant's understanding of the applicable Engineering requirements." The issuance of a permit based on construction documents and other data shall not prevent the City of Aspen from requiring the correction of errors in the construction documents and other data.