HomeMy WebLinkAboutFile Documents.675 S Alps Rd.0222.2018 (7).ARBK FROARING FORK
j ENGINEERING
To: Jack Danneberg
Aspen Engineering
Jack.Danneberg@cityofaspen.com
970-429-2750
From: Josh Juron
Roaring Fork Engineering
592 Hwy 133
Carbondale, CO 81623
JoshJ@,rfeng.biz
(970) 404-1144 Reviewed by Engineering
07/03/2019 9:06:35 AM
Richard Goulding "It should be known that this review shall not
relieve the applicant of their responsibility to
Roaring Fork Engineering comply with the requirements of the City of
592 Hwy 133 Aspen.The review and approval by the City is
offered only to assist the applicants
Carbondale, CO 81623 understanding of the applicable Engineering
requirements."The issuance of a permit based
richardg@,rfeng.biz on construction documents and other data shall
(970) 948-7474 not prevent the City of Aspen from requiring the
correction of errors in the construction
documents and other data.
605 and 675 S. Alps Road Drainage Memo
Jack,
The project is located at 605 and 675 South Alps. It is a landscaping effort around the residence with
minor grading at the southside of the residence.The project site is located at the base of Aspen
Mountain at the end of South Alps Road in Aspen, Colorado. The purpose of the project is to improve
the landscaping of the home and add screening for privacy.
The landscape work and minor grading at 605 and 675 South Alps Road does not adversely affect the
drainage patterns onsite or offsite.This report addresses the changes from existing conditions to design
improvements of the landscaping and grading.The residence was completed in 2017 and all runoff
meets the requirements of the URMP.
Prior to improvements:
Under current conditions, 675 South Alps is a single-family residence on a 1.37-acre property located
near the base of Aspen Mountain.The property is surrounded by a large slope on the southwest side of
the home with an average of 2:1 slope coming off the mountain. 605 South Alps is an unoccupied 1.39-
acre just east of the home,this lot is used for open space recreation and landscaping. properties are
surrounded by extensive landscaping, including sodded lawns, shrubs, and trees. Adjacent to the
northeast of the properties there is South Alps Road, a dead end that is used for access by a half-dozen
homes.There are stone steps on the southside, adjacent to the residence. The residence does see some
runoff from Aspen Mountain, however, a storm collection system was designed previously to convey
runoff around the home during large storm events and seasonal runoff.
RECEIVED
08/30/18
ASPEN
BUILDING DEPARTMENT
Q 605 and 675 S. Alps Drainage Memo August 21, 2018
Page 2 of 2
Landscape and Grading Improvements:
The proposed work to be done is improved landscaping to the northeast and south of the existing
residence and minor grading to the south of the residence. The owner is going to replace stone steps
adjacent and south of the home with sodded steps. Improved landscaping to the north and east of the
residence will be implemented. See the landscape architect plans for a planting plan.There are no
design improvements planned that would increase the impervious area on site.
Erosion Control:
The property sits at the base of Aspen Mountain with average slopes of 2:1 and therefore will require
extensive erosion BMP's to mitigate a significant storm event. During previous construction of the
property, a swale was constructed at the toe of slope just upstream of the home to convey flow away
from the footprint of the home.The contractor will implement a stabilized construction entrance and
use the access easement that lies on the northeast side of the property, adjacent to South Alps Road.
Sod will be placed over topsoil immediately after the new grading, so an erosion control blanket will not
be required. During grading, a silt fence will be trenched and placed downstream of the grading, as well
as staggered soil control logs on the slope of the newly graded area. The planting beds will have soil
control logs staggered along the slope until finished planting is achieved. Soil control logs will be
installed and maintained at the downstream perimeter of 605 and 675 South Alps to prevent any
disturbed soil from leaving site during a storm event. See sheet C3 of the civil drawings for the overall
stormwater management plan.
Lic
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If you have any questions, feel free to contact us at Roaring Fork Engineering.
Sincerely,
Richard Goulding
RECEIVED
08/30/18
ASPEN
BUILDING DEPARTMENT