HomeMy WebLinkAboutFile Documents.433 W Bleeker St.0170.2017.ARBKMarkup Summary
Page: 11
Author: jackd
File Name: 06.28.2017.433Bleeker.DrainageReport.pdf
Provide drain down calculations
for drywell.
06.28.2017.433Bleeker.DrainageReport.pdf (2)
Page: 11
Author: jackd
File Name: 06.28.2017.433Bleeker.DrainageReport.pdf
Drywell is not shown as 10ft
away from foundation on the
plan set. Rectify.
Page: SURVEY
Author: jackd
File Name: 45349B.pdf
Show water line associated with
the water valve shown on the
property.
45349B.pdf (1)
Page: [4] C3 GRADING AND UTILITIES
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
The survey shows a water valve
here. What is associated with
this water valve? How will the
existing water valve be
abandoned?
civil plans - 433 W Bleeker.pdf (7)
Page: [5] C4 LAYOUT
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
5'-1 1/16"
11
7.0 Operation and Maintenance
7.1 Drywell
Drywells must be inspected and maintained quarterly to remove sediment and debris that has washed
into them. A maintenance plan shall be submitted to the City in the Drainage Report describing the
maintenance schedule that will be undertaken by the owners of the new residence or building.
Minimum inspection and maintenance requirements include the following:
Inspect drywells at least four times a year and after every storm exceeding 0.5 inches. Dispose of sediment, debris/trash, and any other waste material removed from a drywell at
suitable disposal sites and in compliance with local, State, and Federal waste regulations. Routinely evaluate the drain-down time of the drywell to ensure the maximum time of 24 hours is
not being exceeded. If drain-down times are exceeding the maximum, drain the drywell via
(Name)(#)D (ft)H (ft)π*H*(D/2)2) (ft3)0.3*π*H*((D/2)+1.5)2 - (D/2)2) (ft3)(ft3)(ft3)
DRYWELL 1 6 9 254 95 350 327
Provide drain down
calculations for
drywell.
6.0 Proposed Facilities
6.1 Drywell
The proposed drywell collects all runoff from the site and is designed to have capacity for full detention.
The drywell is 6’ in diameter and 13’ deep, with 9’ of storage capacity. It is 10’ away from the structure
and will not affect the foundation. Given the extra 3’ within the drywell, although the system will back
up, it has a much higher capacity and will not overflow.
7.0 Operation and Maintenance
7.1 Drywell
Drywells must be inspected and maintained quarterly to remove sediment and debris that has washed
into them. A maintenance plan shall be submitted to the City in the Drainage Report describing the
maintenance schedule that will be undertaken by the owners of the new residence or building.
Pipe Design Flow
Rate
Proposed Pipe
Diameter Slope d/D Manning
Coefficient Rh/D Hydraulic Radius Exit Velocity
(ID)Qdes (ft3/sec) Dpro(in)(%)(from Chart)n (from Chart)Rh (ft) = (Rh/D) Dpro V (ft/sec) = [1.49/n] Rh2/3 √S
A1 0.068 4.0 1.50%0.35 0.01 0.19 0.19 6.11
A2 0.156 4.0 1.50%0.57 0.01 0.27 0.27 7.63
A3 0.178 4.0 1.50%0.62 0.01 0.28 0.28 7.80
A4 0.220 4.0 1.50%0.70 0.01 0.30 0.30 8.11
A5 0.248 4.0 1.50%0.75 0.01 0.30 0.30 8.21
A6 0.267 4.0 2.00%0.73 0.01 0.30 0.30 9.41
B1 0.051 4.0 1.50%0.31 0.01 0.18 0.18 5.72
B2 0.062 4.0 1.50%0.35 0.01 0.19 0.19 6.11
B3 0.074 4.0 1.50%0.37 0.01 0.20 0.20 6.20
B4 0.180 4.0 1.50%0.62 0.01 0.28 0.28 7.80
Drywell Storage
Drywell Basins Diameter Storage Depth Internal Volume External (18" of Screened Rock) Volume Total Capacity Required Capacity
(Name)(#)D (ft)H (ft)π*H*(D/2)2) (ft3)0.3*π*H*((D/2)+1.5)2 - (D/2)2) (ft3)(ft3)(ft3)
DRYWELL 1 6 9 254 95 350 327
Drywell is not shown
as 10ft away from
foundation on the
plan set. Rectify.
Show water line
associated with the
water valve shown on
the property.
The survey shows a water valve here.
What is associated with this water valve?
How will the existing water valve be
abandoned?
5'-1
1
/
1
6
"
1/15/18
Page: [5] C4 LAYOUT
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
8'-1 11/32"
Page: [5] C4 LAYOUT
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
No variance will be granted for a
drywell within 10ft of the
neighboring property line.
Page: [5] C4 LAYOUT
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
Drywell is shown within 10ft of
foundation which will require a
variance.
Page: [6] C5 FOUNDATION DRAINS
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
Surface drainage can not be
routed to foundation drywell.
Page: [7] C6 DETAILS
Author: jackd
File Name: civil plans - 433 W Bleeker.pdf
Show pervious paver underdrain
on plans.
8'
-
1
1
1
/
3
2
"
CK 37 No variance will be
granted for a drywell
within 10ft of the
neighboring property
line.
ALLEY
B
L
O
C
K
3
7
Drywell is shown
within 10ft of
foundation which will
require a variance.
Surface drainage can
not be routed to
foundation drywell.
Show pervious paver
underdrain on plans.
1/15/18
From: Jay Engstrom
Roaring Fork Engineering
592 Highway 133
Carbondale, CO 81623
Jaye@rfeng.biz
(970) 404-1144
Richard Goulding
Roaring Fork Engineering
592 Highway 133
Carbondale, CO 81623
richardg@rfeng.biz
(970) 948-7474
To: Jack Danneberg
Civil Engineer
City of Aspen Engineering Department
130 S. Galena Street
970-429-2776 (Office)
970-920-5081 (Fax)
433 West Bleeker Comment Responses
Permit Number: 0170. 2017.ARBK
January 10th, 2018
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.
---------------------------------------------------------------------------------------------------------------------
ENGINEERING REVIEW COMMENTS AND CORRECTIONS
Drainage Report and Plan
The drainage report and plan set is not in compliance with the City of Aspen Grading and Drainage
Requirements for Major Design. The following items from the Checklist for Grading and Drainage
Requirements for Major Design need to be included, addressed or discussed:
DRAINAGE PLANS SHALL INCLUDE:
1. The survey shows a water valve here. What is associated with this water valve? How will the
existing valve be abandoned?
The valve shown on the survey is an irrigation valve. An existing water line appears to run
onto the property and has been installed for irrigation purposes. Water service will be
1/15/18
433 W Bleeker Comment Responses January 10th, 2018
Page 2 of 3
abandoned as per City of Aspen Water Department Specifications and irrigation and water
lines will be removed. Notes have been added to the utilities design on page C3.
2. Revise dimensions of the distance between the drywell and the foundations and property line.
The proposed drywell size and location has been revised. A smaller diameter and deeper
drywell was used to infiltrate the groundwater below the foundation. The edge of the drywell
is now 10’ from the neighboring property and 5’ from the Alley Block 37 Right of Way. A
variance has been submitted to have the drywell within the 10’ setback from the alley and the
structure foundations. This design was approved by HP Kumar, and a description of the
agreed drywell is included in the attached letter. See Sheet C2 for updated calculations and
C4 for layout and information within the plan set, along with updates in the drainage report.
3. No variance will be granted for a drywell within 10ft of the neighboring property line.
See previous comment response. The drywell is now 10’ away from the neighboring property
line, but 5’ away from the alley right-of-way. A variance to allow a drywell within the 10’
Right-of-Way setback from the Alley Block 37 has been submitted to approve the new
location of the drywell.
4. Drywell is shown within 10ft of foundation which will require a variance.
A detailed cross section has been provided to show the feasibility of a drywell within 10 feet
of the foundation without affecting the foundation. The foundation of the lightwell is within 5
feet of the drywell, however the footer from the main foundation wall is almost 12 feet away.
A variance has been submitted to allow the placement of a drywell within 10 feet of the
structure. This design was approved by HP Kumar, and a description of the agreed drywell is
included in the attached letter. See Sheet C4 of the plan set.
5. Surface drainage cannot be routed to foundation drywell
A lightwell detail has been included on page C5 of the civil set. Lightwells have snowmelted
concrete, where a center drain conveys runoff into a screened rock bed beneath the concrete
base.
6. Show pervious paver underdrain on plans.
The location of the underdrains of the pervious paver patios and tie in locations have been
shown on Sheets C3 & C4 of the plan set.
DRAINAGE REPORT SHALL INCLUDE:
1. Provide drain down calculation for drywell.
A percolation test was performed on December 19th, 2017. Draw down time has been
calculated using the determined rate of 6 inches per hour. See page 11 of Drainage Report.
HP Kumar approval
of drywell location
must be included in
the variance request.
1/15/18
433 W Bleeker Comment Responses January 10th, 2018
Page 3 of 3
2. Drywell is not shown as 10ft away from foundation on the plan set. Rectify.
Drywell location has been updated in Drainage Report with explanation of placement and
feasibility. See page 11 of Drainage Report.
---------------------------------------------------------------------------------------------------------------------
Feel free to contact me if you have any questions about the responses to your comments.
Sincerely,
Jay Engstrom
Design Engineer
Roaring Fork Engineering
(970) 404 – 1144
jaye@rfeng.biz
1/15/18