HomeMy WebLinkAboutFile Documents.219 N Monarch St.0179.2017 (24).ARBK
An Employee-Owned Company
Date: November 16, 2017
To: Jack Danneberg
Civil Engineer, City of Aspen
Phone 970/429-2750
jack.danneberg @cityofaspen.com
From: Daniel Dennison
High Country Engineering
1517 Blake Ave
Glenwood Springs, CO 81601
ddennison@hceng.com | 970-945-8676
Permit No. 0179.2017.ARBK, 219 North Monarch Street
On August 31, 2017, High Country Engineering, Inc. (HCE) received comments from the City of Aspen
Engineering Department relating to the constructions documents and drainage study for the site located at
219 North Monarch Street. A copy of the original comments is attached with responses.
All addressed comments by High Country Engineering shown in red below the City comment.
Land Surveying Civil Engineering
12/26/2017
Markup Summary
Page: 1
Author: jackd
File Name: 2171613 ISP-TOPO 24X36 04-18-17 (1).pdf
Surveyor's certificate must state
that the error of closure is less
that 1/15,000.
2171613 ISP-TOPO 24X36 04-18-17 (1).pdf (2)
Page: 1
Author: jackd
File Name: 2171613 ISP-TOPO 24X36 04-18-17 (1).pdf
Survey:
1. Survey must be tied to two
COA monuments.
2. Provide vicinity map.
Page: 11
Author: jackd
File Name: 219 N Monarch Drainage Study.pdf
Provide volume calculations for
each bioretention pond.
219 N Monarch Drainage Study.pdf (2)
Page: 11
Author: jackd
File Name: 219 N Monarch Drainage Study.pdf
Include pipes and trench drains
in Operation and maintenance
section of the drainage study.
Page: 1
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Show all roof drains and
downspout locations on the
plans.
CIVIL PERMIT SET_STAMPED 07-24-17.pdf (19)
Surveyor's certificate
must state that the
error of closure is
less that 1/15,000.
Survey:
1. Survey must be tied to two COA monuments.
2. Provide vicinity map.
BASIN BIORETENTION AREA WQCV (Watershed inches) WQCV (CF)
PR-1 NORTHWEST 0.082 28.3
PR-2 NORTHEAST 0.088 12.4
PR-3 SOUTHEAST 0.080 21.2 TOTAL 0.082 61.9
If the bioretention facilities surpass the WQCV, the system will allow runoff to overflow the pond weirs before entering the City of Aspen curb and gutter system, as it did
historically. Calculations for the proposed drainage facilities are included in the appendices of this report under the Facility Calculations section.
F. Operation and Maintenance
The proposed drainage facilities are to be constructed in conformance with the City of Aspen Urban Runoff Management Plan, dated April 2010 and revised thereafter.
The bio-retention basins will need to be inspected and maintained quarterly to make sure that the reservoirs have not become clogged and that the reservoirs are functioning properly. Debris and liter removal shall occur routinely. The owners of the property will be responsible for the maintenance and upkeep of the drainage facilities. The property owner shall dispose of sediment and any other waste material removed from a reservoir at suitable disposal sites and in compliance with local, state, and federal waste regulations.
This project includes “Low Impact Site Design” to mimic the natural pre-development hydraulic pattern. Storm water runoff is to be in contact with soils and plants prior to reaching
Provide volume
calculations for each
bioretention pond.
BASIN BIORETENTION AREA WQCV (Watershed inches) WQCV (CF)
PR-1 NORTHWEST 0.082 28.3
PR-2 NORTHEAST 0.088 12.4 PR-3 SOUTHEAST 0.080 21.2 TOTAL 0.082 61.9
If the bioretention facilities surpass the WQCV, the system will allow runoff to overflow
the pond weirs before entering the City of Aspen curb and gutter system, as it did historically. Calculations for the proposed drainage facilities are included in the appendices of this report under the Facility Calculations section.
F. Operation and Maintenance
The proposed drainage facilities are to be constructed in conformance with the City of Aspen Urban Runoff Management Plan, dated April 2010 and revised thereafter.
The bio-retention basins will need to be inspected and maintained quarterly to make sure that the reservoirs have not become clogged and that the reservoirs are functioning properly.
Debris and liter removal shall occur routinely. The owners of the property will be responsible for the maintenance and upkeep of the drainage facilities. The property owner shall dispose of sediment and any other waste material removed from a reservoir at suitable disposal sites and in compliance with local, state, and federal waste regulations.
This project includes “Low Impact Site Design” to mimic the natural pre-development hydraulic pattern. Storm water runoff is to be in contact with soils and plants prior to reaching the City of Aspen curb and gutter system. The plants and soil are to act as filters to remove
pollutants. The proposed plants and soils are present along the lengths of proposed graded swales and within the proposed bio-retention basins.
Include pipes and trench drains in Operation and
maintenance section of the drainage study.
Show all roof drains
and downspout
locations on the
plans.
Surveyor's certificate has been
modified as requested.
Surveyor's certificate has been
modified as requested.
The calculations used in
bioretention pond design have
been added to the pdf of the
drainage report
The maintenace portions of the
drainage study now include the
pipes and trench drains.
The roof drain downspout
locations are now clearly
labeled on sheet C4 of the civil
set.
12/26/2017
Page: 3
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Move Utility pedistals onto
private property.
Page: 3
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
The utility pedistals on the SE
corner of the lot need to be
moved onto private property out
of the alley.
Page: 3
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Maintain 30" seperation between
gas and electric.
Page: 4
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
This access walkway will require
approval by the City of Aspen
Parks Department due to tree
conflicts.
Page: 4
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Show all roof drains.
Move Utility pedistals
onto private property.
The utility pedistals
on the SE corner of
the lot need to be
moved onto private
property out of the
alley.
Maintain 30"
seperation between
gas and electric.
This access walkway
will require approval
by the City of Aspen
Parks Department
due to tree conflicts.
Show all roof drains.
The utility pedastals have been
relocated into the property as
requested on sheet C3.
The utility pedastals have been
relocated into the property as
requested on sheet C3.
Gas and electric line layout
has been updated to provide a
minimum 30" separation.
Understood. We did the best we
could to stay beyond the tree drip
lines on both sides of the path.
Roof downspouts were shown, but
have been revised to be more
visible and called out in grading
plan.
12/26/2017
Page: 4
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Call out all inverts of perforated
pipes.
Page: 5
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Widen alley way to 16ft.
Page: 5
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Design ADA ramps at 2% to
minimize water in ramp.
Page: 5
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
When measured by point
elevations these Eastern ADA
ramps exceed 8.3% slope.
Please correct. Try to design
slope less than 8.3% slope to
help field install.
Page: 6
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Point elevations don't match
cross sections. Please correct.
Call out all inverts of
perforated pipes.
Widen alley way to
16ft.
Design ADA ramps at
2% to minimize water
in ramp.
When measured by
point elevations
these Eastern ADA
ramps exceed 8.3%
slope. Please correct.
Try to design slope
less than 8.3% slope
to help field install.
Point elevations don't
match cross sections.
Please correct.
The plans reflect a 16' driveway with
handicap ramps that narrows to the
existing alley width behind the
sidewalk. This would be installed if
the City requires the alley intersection
improvements made during this
permitting process must be removed.
The cross-sections have been
revised to reflect the
corrsesponding spot
elevations.
The ramp slopes have been
adjusted.
The ramp lengths have been
increased to reduce slope to 8.3%
max slope where necessary.
We have added call outs along
the swale perforated pipes.
12/26/2017
Page: 6
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Design positive drainage out of
the ADA ramp to prevent
ponding.
Page: 7
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
What is the turning radius of this
modeled fire truck?
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
Details:
1. Provide asphalt patching
detail.
2. Provide sidewalk detail.
3. Provide curb and gutter detail.
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
The City of Aspen bioretention
spec calls for 70% sand and
30% organics.
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
An impermeable liner is not
required for this swale.
Design positive
drainage out of the
ADA ramp to prevent
ponding.
What is the turning
radius of this
modeled fire truck?
Details:
1. Provide asphalt patching detail.
2. Provide sidewalk detail.
3. Provide curb and gutter detail.
The City of Aspen
bioretention spec
calls for 70% sand
and 30% organics.
An impermeable liner
is not required for this
swale.
Updated the Station 1+50 cross-
section.
We have added the Aspen Fire
Proptection District fire truck
specs to the exhibits of the
turning movements around the
narrowed Hallam/Monarch curve.
We have added these details to
the draings set.
Revised soils media in
detail per City of Aspen
specifications.
Impermeable liner is included
for swales with underdrain
due to the proximity of
house. This was going to be
allowed based on our
conversations with City of
Aspen Engineering Stafff.
12/26/2017
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
How will the pipe entering
bioretention pond B be
maintained?
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
These values for swale B(2)
seem inconsistent with the rest
of the drainage calculations.
Page: 8
Author: jackd
File Name: CIVIL PERMIT SET_STAMPED 07-24-17.pdf
A bioretention system that has
an impermeable liner requires an
underdrain. This liner is not
required.
How will the pipe
entering bioretention
pond B be
maintained?
These values for
swale B(2) seem
inconsistent with the
rest of the drainage
calculations.
A bioretention system that has
an impermeable liner requires
an underdrain. This liner is not
required.
Added maitenance description/
note to detail and drainage report
narrative
The calcuations and detail are now
matching.
Changed impermeable liner to filter
fabric within the bioretention
ponds.12/26/2017