HomeMy WebLinkAboutFile Documents.533 W Hallam St.0285.2018 (111).ARBK0285.2018.ARBK_533 W Hallam
Page: [4] C1 Demolition Plan
File Name: Civil Plans. 533 W HALLAM.pdf It appears the sanitary sewer
service will be abandoned and
relocated as opposed to
removed and replaced as
indicated on the demo plan.
Civil Plans. 533 W HALLAM.pdf (10)
Page: [5] C2 Site Plan
File Name: Civil Plans. 533 W HALLAM.pdf Label for pervious gravel on Site
Plan is illegible.
Page: [5] C2 Site Plan
File Name: Civil Plans. 533 W HALLAM.pdf Label Rain Garden, pervious
pavers, grass buffer on Site
Plan.
Page: [6] C3 Utility Plan
File Name: Civil Plans. 533 W HALLAM.pdf Is the new electric line routed
from a transformer with
adequate capacity? Show trench
across the alley.
Page: [6] C3 Utility Plan
File Name: Civil Plans. 533 W HALLAM.pdf Specify Type K Copper for water
service
10"
4"
4"
6"
8"
It appears the sanitary
sewer service will be
abandoned and relocated as
opposed to removed and
replaced as indicated on the
demo plan.
Label for pervious gravel on Site Plan is
illegible.
Label Rain Garden, pervious pavers,
grass buffer on Site Plan.
Is the new electric line routed
from a transformer with
adequate capacity? Show
trench across the alley.
Specify Type K
Copper for water
service
LANDSCAPE RESPONSE
2019-09-05
ENGINEERING
10/16/2019
Page: [6] C3 Utility Plan
File Name: Civil Plans. 533 W HALLAM.pdf Show abandonment of existing
service line at the tap. Show
asphalt patches in Hallam St.
Patches must meet Engineering
Standards for work in the ROW.
Page: [7] C4 Grading & Drainage Plan
File Name: Civil Plans. 533 W HALLAM.pdf There appears to be a handful of
conflicts between drainage
components and tree driplines .
Work with Parks Dept to resolve.
Page: [7] C4 Grading & Drainage Plan
File Name: Civil Plans. 533 W HALLAM.pdf Per section 4.3 of the
Engineering Design Standards,
Curb and Gutter needs to be
replaced throughout the
property. Detail shall match City
of Aspen Mountable Curb
Standard Detail #ENG-201 B.
The detail can be found in the
Engineering Design Standards.
Page: [9] C6 Foundation Drainage Plan
File Name: Civil Plans. 533 W HALLAM.pdf Do not see this sump and pump
on the mechanical drawings.
Where does this outfall?
Page: [10] C7 Detail (1)
File Name: Civil Plans. 533 W HALLAM.pdf Provide a detail that shows the
pavers proposed on the west
side of the property.
Show abandonment of existing
service line at the tap. Show
asphalt patches in Hallam St.
Patches must meet Engineering
Standards for work in the ROW.
There appears to be a handful
of conflicts between drainage
components and tree driplines .
Work with Parks Dept to
resolve.
Per section 4.3 of the
Engineering Design Standards,
Curb and Gutter needs to be
replaced throughout the
property. Detail shall match City
of Aspen Mountable Curb
Standard Detail #ENG-201 B.
The detail can be found in the
Engineering Design Standards.
Do not see this sump
and pump on the
mechanical drawings.
Where does this
outfall?
Provide a detail that shows the
pavers proposed on the west
side of the property.
10/16/2019
Page: [1] Appendix A Basins & WQCV
File Name: Drainage Report.533 W Hallam.pdf What area drains to the
raingarden? This drainage map
show Basin 1 routed north and
the underdrain from the gravel
bed routed under the rain
garden.
Drainage Report.533 W Hallam.pdf (12)
Page: [1] Appendix A Basins & WQCV
File Name: Drainage Report.533 W Hallam.pdf Show major Drainage Basins A,
B, C and D on the Drainage
Map. Each sub-basin should be
labeled with its area and WQCV.
Also show roof downspouts
locations, and contours. Provide
finished floor and grade at
foundation elevations at all
building corners or transitions.
Also provide lot corner
elevations and any grade break
elevations critical to the grading
concept.
Page: [1] Appendix A Basins & WQCV
File Name: Drainage Report.533 W Hallam.pdf Hatching for no infiltration gravel
is different in the legend than
shown on the Drainage Map.
Page: 4
File Name: Drainage Report.533 W Hallam.pdf Please discuss soil types in
Section 1.2 of the Drainage
Report
Page: 4
File Name: Drainage Report.533 W Hallam.pdf Report indicates 260 SF of
pervious pavers while drainage
exhibit shows 216 SF.
A
What area drains to the
raingarden? This drainage map
show Basin 1 routed north and
the underdrain from the gravel
bed routed under the rain
garden.
Show major Drainage Basins A, B, C
and D on the Drainage Map. Each
sub-basin should be labeled with its area
and WQCV. Also show roof downspouts
locations, and contours. Provide finished
floor and grade at foundation elevations
at all building corners or transitions. Also
provide lot corner elevations and any
grade break elevations critical to the
grading concept.
Hatching for no infiltration gravel is
different in the legend than shown on the
Drainage Map.
ers the property. Existing peak flow ca
ause detention will not be required a
harging to the City of Aspen (COA) s
emolish the non-historic portion of th
provements include the addition of on
Please discuss soil
types in Section 1.2
of the Drainage
Report
Major Design 3
sidential development with have a footprint of 3160 square feet. The
of the property, which has a footprint of 900 square feet, will be moved
main intact. The main building will be located on the southern portion of th
nt of 2260 square feet.
lity improvements consist of 150 square feet of grass buffer, 260 square
ion pervious pavers, 315 square feet of no-infiltration pervious gravel an
rain gardens. The grass buffer will be located on the northern portion of
ation pervious pavers will be located on the western central portion of th
ation pervious gravel will be located on the eastern central portion of the
located on the northeast portion of the lot. No storm water generated on
oss the eastern property line onto the neighboring residential lot due to th
Report indicates 260 SF of pervious
pavers while drainage exhibit shows 216
SF.
10/16/2019
Page: 5
File Name: Drainage Report.533 W Hallam.pdf It appears your Word template
has a broken reference in
Section 3.1 of the Drainage
Report.
Page: 6
File Name: Drainage Report.533 W Hallam.pdf Impervious area to grass buffer
ratio must be 1:1. Refer to page
8-43 of the URMP.
Page: 6
File Name: Drainage Report.533 W Hallam.pdf In Table 2 the grass buffer area
is omitted, however sub basin 2
utilizes a grass buffer.
Page: 8
File Name: Drainage Report.533 W Hallam.pdf No rain garden is shown in basin
5.
Page: 8
File Name: Drainage Report.533 W Hallam.pdf Please check all areas in the
narrative for Basin C and ensure
they are consistent with the rest
of the Drainage Report.
of the site generally between the property line and the
h additional drainage from the front of the historic roof.
A. This basin is 1356 square feet of which 488 square
it is calculated per section 8.4.1 of the COA URMP, a
r! Reference source not found.. A 150 square foot
garden will be used to treat the remaining WQCV. See
n of BMPs in this basin.
It appears your Word template has a
broken reference in Section 3.1 of the
Drainage Report.
towards north-east corner of the property and has a total a
4 and 254 square feet, respectively. This corresponds to 37
e sub-basin. This area is mostly a grassed area with the no
uded. Storm water will be routed from the roof to a rain gard
ownspouts then north to the curb and gutter on W. Hallam S
at the very north-west corner of the property and has a tota
2 and 234 square feet, respectively. This corresponds to 35
e sub-basin. This area is mostly a grassed area with the no
uded. Storm water will be routed from the roof to a 150 squa
flow and then north to the curb and gutter on W. Hallam St.
, 6, & 7)
Impervious area to grass buffer
ratio must be 1:1. Refer to page
8-43 of the URMP.
1356
36%
8.39
0
0
107
0.0
6.5
230.9
17%
-1.7
10.13
In Table 2 the grass buffer area is
omitted, however sub basin 2 utilizes a
grass buffer.
f the, comprised solely of sub-basin 5
buffer, rain garden and pervious pav
n 5th St. This basin is 1312 square fe
r, pervious pavers, and a rain garden
d grass buffer is 161 square feet and
A rain garden is proposed to capture
ted by the reduction in effective
No rain garden is shown in
basin 5.
gravel. Drainage and grading will allow roughly 3.6 cubic feet of untreated runoff in this
basin will sheet flow into sub-basin 6, where there is excess available treatment volume
provided by the no-infiltration pervious pavers.
.3 Basin C (sub-basin 4)
Basin C is located on the north-west side of the site and will collect runoff from the back side
of the roof for the historic building and the north end of the proposed structure. Basin C
consists only of sub-basins 4. Storm water will be routed from both roofed areas to no-
infiltration pervious pavers and then to the curb and gutter on 5th St. This basin is 1312
square feet of which 720 square feet is impervious. Storm water runoff will be treated with
135 square feet of no-infiltration pervious pavers. Remaining WQCV is expected to be
treated by the reduction in impervious area provided by a 84.7 square foot tree canopy
credit. See Appendix A for the proposed location of BMPs in this basin. After water infiltrates
through the gravel and enters the slot drain, it is discharged by a reverse trench drain to
ensure runoff is leaving the site in the same manner it did historically.
Table 4
Basin C
Basin Area (sf) 796
% Impervious 33%
Required WQCV (cf) 4.56
Credits
Pervious Paver Area (sf) 0
Grass Buffer Area (sf) 0
Tree Canopy Credit Area (sf) 80.5
No-infiltration Paver Vol. (cf) 22.57
Rain Garden Vol. (cf) 0.0
Results
Please check all areas in the narrative
for Basin C and ensure they are
consistent with the rest of the Drainage
Report.
10/16/2019
Page: 8
File Name: Drainage Report.533 W Hallam.pdf Please check all areas in the
narrative for Basin D and ensure
they are consistent with the rest
of the Drainage Report.
Page: 20
File Name: Drainage Report.533 W Hallam.pdf Use Figure 3.3 of the URMP as
opposed to Urban Drainage
Tables for runoff coefficients.
Page: 2
File Name: Excavation Stabilization Plan.533 W Hallam.pdf Soil nails extend in dripline and
directly below trees. Verify with
Parks Dept if this is permissible.
Excavation Stabilization Plan.533 W Hallam.pdf (2)
Page: 2
File Name: Excavation Stabilization Plan.533 W Hallam.pdf Soil nails extend below a
significant tree. Verify with Parks
Department this is permissible.
Page: 4
File Name: Landscape Plans. 533 W HALLAM.pdf The existing gravel parking area
must be removed and replaced
with sod. The parking area is not
permitted int he City ROW.
Landscape Plans. 533 W HALLAM.pdf (3)
s 33%
Required WQCV (cf) 4.56
er Area (sf) 0
Area (sf) 0
Credit Area (sf) 80.5
on Paver Vol. (cf) 22.57
Vol. (cf) 0.0
pervious Area (sf) 178
mperviousness 22%
cf) -19.1
Available WQCV (cf) 23.68
b-basin 5)
ocated along the west-central portion of the, comprised solely of sub-basin 5.
r will be routed from the roof to a grass buffer, rain garden and pervious pavers.
hen sheet flow to the curb and gutter on 5th St. This basin is 1312 square feet of
square feet is impervious. A grass buffer, pervious pavers, and a rain garden will
treat runoff from the roof. The proposed grass buffer is 161 square feet and the
ervious pavers cover 80.8 square feet. A rain garden is proposed to captured
eet of runoff. Remaining WQCV is treated by the reduction in effective
area provided by the 104 square foot tree canopy credit. See Appendix A for the
ocation of BMPs in this basin.
Please check all areas in the narrative
for Basin D and ensure they are
consistent with the rest of the Drainage
Report.
jk ,extent of property from South to North
@? ;D F@HDℎ 8?B < 3_8:;DC@? ;D ?@9Dℎ 8?B
jk
ID < 7912.54 ID
100 ID
}
k, & >•kk
, and 100-year storm return period runoff coefficients can
e Urban Drainage and Flood Control District (UDFCD)
eria Manual (USDCM)
>~ 0.86Ck.^^ 0.4621 >•k 0.81C T 0.057 0.5147 >•kk 0.47C T 0.426 0.6916
ntration, =€
Use Figure 3.3 of the URMP as opposed
to Urban Drainage Tables for runoff
coefficients.
25' - 5 1/2"
4
PROPERTY LINE
10' SETBACK
Soil nails extend in dripline and
directly below trees. Verify with
Parks Dept if this is permissible.
L
5' SETBACK
PROPERTY LINE
4' - 5 1/2"
1
"
Soil nails extend below a
significant tree. Verify with
Parks Department this is
permissible.
7915
Sod
MH
Gravel Alley
avel Alley
2" Fence
ncrete Pavers Set In Grass
ac Shrub
The existing gravel parking area
must be removed and replaced
with sod. The parking area is
not permitted int he City ROW.THE EXISTING GRAVEL
PARKING AREA HAS BEEN
REMOVED ON ALL
LANDSCAPE PLANS.
10/16/2019
Page: 4
File Name: Landscape Plans. 533 W HALLAM.pdf A raingarden is shown on the
civil sheets but not the
landscape plans. Verify all
sheets are consistent.
Page: 4
File Name: Landscape Plans. 533 W HALLAM.pdf The Civil plans show the
pervious pebble section
extending to the property line.
The landscape plans show about
half of the area pebbles and the
other half creeping speedwall.
The full area is used for WQCV
in the civil plans. Ensure both
sets align and the required area
and volume is provided for
WQCV. The depth of the "paver"
section cannot exceed what is in
the URMP.
Page: 2
File Name: Shoring Plans. 533 W HALLAM.pdf Soil nails extend in tree drip lines
and below tree trunks. Verify
with Parks Dept this is
permissible.
Shoring Plans. 533 W HALLAM.pdf (1)
FA
DLDL
DLCS
Sod
A raingarden is shown on the
civil sheets but not the
landscape plans. Verify all
sheets are consistent.
791
4
CS
Pervious Paver
Proposed Grou
Proposed Lilacs
Existing Trees O
Property Line
Mexican Beach Pebbles For Civil's Drainage
The Civil plans show the
pervious pebble section
extending to the property line.
The landscape plans show
about half of the area pebbles
and the other half creeping
speedwall. The full area is used
for WQCV in the civil plans.
Ensure both sets align and the
required area and volume is
provided for WQCV. The depth
of the "paver" section cannot
exceed what is in the URMP.
25' - 5 1/2"
PROPERTY LINE
Soil nails extend in tree drip
lines and below tree trunks.
Verify with Parks Dept this is
permissible.
RAINGARDEN IS SHOWN ON
ALL LANDSCAPE PLANS.
PLANTS HAVE BEEN REMOVED
AND COORDINATED WITH CIVIL
PLANS.
10/16/2019