HomeMy WebLinkAboutCorrespondence (\ttt--
f4 25
February 23, 2004
Bridgette George
COCS- Development Services
P.O. Box 9960
E SP E rn College Station, TX 77840
o
+' c Re: Waterwood Condos Phase 2-A
c -v c E os Dear Bridgette,
O a p 0 , U
= a ' WI c
dS c € As requested we are submitting one complete set of construction documents with
• 8 ▪ = cox the revised site and landscaping plans and the easement dedication sheet has already
c � c
En = c o been submitted with the first phase and has not been relinquished. The following are
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751`" o. > our responses to Staff Review Comments #1 for the Waterwood Condos project.
�c u a .0 Please note that due to additional client driven changes we are submitting only
_ to Phase 2 -A with this resubmittal.
ui Planning:
a Comment: ease note that no more units may be constructed on this lot
c id without the construction of Central Park Lane. (Refer to note 6 on
Ca L a the plat of this property.)
CT L. y Answer: Acknowledged.
Xa uc
n . a Comment: .'ecause of the level of detail provided, review and approval of this
lo site plan will be for Phase 2 only.
x =' Answer: Acknowledged.
c 8
cu" p Comment: :/1 lease provide a curb and pavement detail.
Answer: -See sheet 06.
n. et Comment: ' 7.5.C.1.d states that the phase line must be drawn 20 feet
N o bend any new site amenity in that phase.
Z ji oS Answer: This has been added to the landscape plan.
a N
W V f H Comment: , Qfie interior parking island (minimum 180 s.f) is required for every
O ui a m Vgroup of 15 (or fewer) parking spaces. This island area may be
G configured as you wish, but must be located within the interior
1 parking area. All parking spaces shown in phase 2 are interior
J .4.11 2 3 0 , 1 parking spaces, except the 9 spaces that are adjacent to the eastern
W 1 t N,$ 9r6perty line.
X , ( h Answer: 'Phase 2 -A meets the ordinance requirement for interior islands.
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Comment: FYI: building separation is a minimum of 15' feet with out additional
fire protection.
Answer: All buildings have interior & exterior 1 hour fire walls.
Comment: v /Please show all building setbacks on the Phase 2 site plan. (they are
alr ady shown on the site plan showing all phases.)
Answer: vS are now shown.
Comment: V ,Jf a parking space is only 18 feet in length and hangs into a sidewalk,
the sidewalk must be a minimum of 6 feet wide.
Answer: ;/Sidewalks (adjacent to the parking areas) have been increased to 6
feet.
Comment: avirnimum drive aisle width in a parking area is 23 feet. The aisle
width called out in the smaller eastern most parking area is 22.7
Answer: drive aisles are now 23 feet.
Comment: ,,?'lease call out dumpster screening. (( i�,,y1, ;
Answer: Dumpster screening is no longer in Phase 2A. Phase 2A wil ot utili y r(�. ' , l {1 �:� U
Phase 1 dumpsters.
-- Comment: please call out all easements on the phase 2 site plan.
` Answer: A blanket easement has been provided on the property. A general
n ote stating the public waterline & public sewerline will be covered
f C?) with an easement upon completion of construction has been added.
` � ce,� 1,c, Comment: ' meters, utilities, transformers must be located in the public ROW
;` or in a PUE.
c j� \�� Answer: They will be contained in a PUE.
/It Comment: I/'Please label the 2 proposed fire hydrants. (Some symbols can not be
because of other lines on the plan.)
Answer: The fire hydrant in Phase 2A has been labeled.
Comment: All fire hydrants and fire lanes are public and must be in an
easement.
Answer: Acknowledged.
✓Comment: The maximum depth allowed for the area provided for backing
maneuvers is 4'. (In the parking area at the eastern property line.)
1, wer: This area has been reduced in size.
��
.; \ V
Comment: /The adjacent property is zoned R -4 and not R -5 as indicated on the
,1 an.
Answer: V/ Corrected.
1 Comment: A 120' hammerhead (or approved alternative) is needed at the east
end of Phase 2 for the fire truck turnaround.
, g Answer: We provided a temporary turnaround at the end of Phase 2A.
U`,., _n
�� Comment: Provide a general note that all roof and ground- mounted mechanical
∎ a ' u p ) equipment shall be screened from view or isolated so as not to be
visible from any public right -of -way or residential district within 150'
of the subject lot, measured from any point five feet above grade.
Such screening shall be coordinated with the building architecture
d scale to maintain a unified appearance.
Answer: V Note added to sheet 2.
/
Comment: V Please provide a water and sanitary sewer legend that includes water
emands and sewer loadings.
Answer: / Notes added to sheet 2.
Comment: 1/ P ase call out material of retaining walls or provide detail. All
le
concrete retaining walls must be screened.
Answer: Retaining wall is not in Phase 2A. Note will be added with Phase 2B
plans.
Landscaping/ treetscapinp/Buffer:
Comment: T he Phase line must be drawn 20 feet beyond any new site amenity,
f9r landscape area requirements
Answer: t/This line has been drawn.
Comment: ease check landscape legend. The number of plants does not add
up or match what is shown on the plan for both canopy and non -
i c opy trees. The difference changes the calculations and total
oints provided.
Answer: Corrected.
Comment: !Non- canopy trees are measured by a single trunk. Please call out the
minimum single trunk caliper.
Answer: ✓ Call out added.
Comment: Please show all utility connection points and show that they are
screened or provide a note that they will be screened from adjacent
properties and right -of -way.
Answer: Note added.
Comment: A 10 -foot planted buffer and screening fence is required betwenn
phase 2 of this multifamily development and the R -1 zoned property
that is currently developed as a church.
Answer: Buffer & screening fence added.
Engineering:
Comment: Please provide scale on each sheet.
Answer: Added.
Comment: Please note, all private sewer must meet building code. The only
public line you have chosen to do is the Sanitary Sewer #1. A few
comments have been provided in order for plans to meet code.
Please revise plans accordingly.
Answer: Plans have been revised and note added that private sewer to meet
building code.
Comment: Minimum slope on private 6 -in. building sewer is 1.04% with
minimum 12 -in. bury.
Answer: Slope corrected.
Comment: Cleanouts require every 100 -ft. or change in direction. Please show
or add note.
Answer: Cleanouts were there but not labeled. Labels have been added.
Comment: Please show future easement on public utilities.
Answer: Future easements have been called out as a general note. When
easements are written we will provide an as built sheet w/
easements.
Comment: The public sewer should remain 10 -in. and not 12 -in.
Answer: The 12 inch is necessary to provide the same capacity.
Comment: Records show the upstream, off -site; NE /SW sewer lines are 8 -in.
and not 10 -in. as shown.
Answer: Corrected to 8 -in. We have conflicting data that shows 10 -in.
Comment: The 4 -in. water lines are public and require a plan and profile. Please
note, the entire water system is public up to the meter unless you
wish to "isolate" the public side from the private. The entire public
line to be installed with this project must have a profile drawing
accompany the plan view.
Answer: Profiles added.
Comment: Provide 8x4 MJ tees in lieu of saddles. 4 -in. line not in service.
Answer: 8x4 MJ tees have been added.
Comment: In relation to a previous comment, the water design provides only
one water main to serve both sides of the parking lot instead of a
dual line system. The result is numerous very long service lines on
the public side under pavement. The design burdens the City
maintaining lines under pavement rather than the private sewer.
Please discuss other options.
Answer: This will be changed with Phase 2B plans.
Comment: Does the Utility Crossing Detail apply to where the private sewer
has been designed over the public water line? If so, does the detail
alleviate concerns the City may have with the proximity of the
building sewer line to the public waterline and the fact that the sewer
is over the waterline?
Answer: Encasement has been added on the waterline where sewer crosses
over the waterline.
Comment: A blow -off is required on the end of the 4 -in. public line.
Answer: In Phase 2A the 4" line will be connected to the 4" in Phase I.
Comment: A blow -off is required on the east end of the Waterline #1.
Answer: Waterline #1 now ends in a new location. It will be extended with a
new set of plans for Phase 2B in approx. 2 weeks. At the end of the
Phase 2B waterline we will provide a blowoff.
Comment: A blow -off is shown on the west end of Waterline #1. However, the
blow -off shown does not comply with City standards/details.
Answer: Blowoff detail has been changed.
Comment: The drainage flume on the southwest corner of the property should
not discharge off -site unless the off-site impact after development is
equal to or less than predevelopment. Otherwise, it should drain to
the detention pond.
Answer: The flume is not in Phase 2A. It will be changed and the flume will
not be in Phase 2B.
Comment: Only two inlets on storm sewer have been provided to drain the
entire developed area. Is this sufficient to provide less than 10 -in. of
ponding in parking lot?
Answer: Yes, we have revised the drainage report to show the ponding depth
and revised storm sizes.
Comment: Provide Structural Area detail or label individual structural backfill
sections on public infrastructure.
Answer: Structural area detail is on detail sheet.
Comment: Does the note "Provide Trench Grate" apply to the upstream
sidewalk crossing as well?
Answer: We have removed the trench grate detail and provided an
underground storm line instead.
Electrical:
Comment: Developer installs conduit per city specs and design.
Answer: Acknowledged.
Comment: Developer provides 30' of rigid conduit for riser poles. Developer
installs first 10'. City installs remainder.
Answer: Acknowledged.
Comment: Developer pours transformer pad(s) per city specs and design.
Answer: Acknowledged.
Comment: Developer installs pull boxes as per city specs and design. (Pull
boxes provided by the city.)
Answer: Acknowledged.
Comment: Developer provides digital AutoCAD 2002 version of plat and/or
site plan. Email to rbolin @cstx.gov.
Answer: Site plan will be emailed to R Bolin.
Comment: Developer provides load data for project.
Answer: Load data for Phase 2A will be emailed to R Bolin.
Comment: Developer provides temporary blanket easement for construction
purposes.
Answer: Temporary blanket has already been provided.
Comment: Developer provides easements for electric infrastructure as installed
for electric lines.
Answer: Acknowledged.
Miscellaneous:
Comment: Irrigation system must be protected by either a Pressure Vacuum
Breaker, a Reduced Pressure Principle Back Flow Device, or a
Double -Check Back Flow Device, and installed as per City
Ordinance 2394.
Answer: Acknowledged.
Comment: All Backflow devices must be installed and tested upon installation
as per City Ordinance 2394.
Answer: Acknowledged.
Thank you for your help on this project. If you have any question please give us a
call.
7At cerely,
Att 1 4 1
Veronica J. . M g , P.E.
Managing Partne
Cc: Jim Stewart, Waterwood Condos
File
2\ 3.04
a
di, February 24, 2004
Spencer Thompson
City of College Station
E" o Development Services
L rn 3 P.O. Box 9960
O
u „ " = College Station, TX 77840
ZY3t °1
vi c N Re: Waterwood Condominiums Drainage Addendum – Phase 2A
C • c c oif ix, ? M - c Dear Spencer,
is a
vi . c :ip ots
s. c g , a The purpose of this letter is to detail the design changes in the proposed Waterwood
.0)5" • ` •_ § Condominiums Phase IIA improvements and the subsequent effects on the proposed drainage
C _0 c . infrastructure detailed in the Waterwood Townhomes Drainage Analysis, Mitchell & Morgan,
.� W 2003. Phase IIA includes the proposed recreational amenities along with the 3 -unit building
C' 2
W v = N rn and associated parking adjacent to Phase I. Per the original drainage analysis, changes to the
site layout are to be addressed in an addendum.
ui Proposed storm drainage infrastructure additions for this phase include the addition of
CZ approximately 4001f of storm sewer detailed in the original report and 200 if of storm sewer
C W that has since been added to accommodate drainage of the parking lot and the future
vi w a recreational area. The proposed Phase IIA storm sewer consists of 85 if of 30" RCP from the
C — existing inlet labeled PA1A north to the proposed junction box (PA7) to be located near the
X If .c 45 a� proposed Phase IIB parking area, which will be constructed at a later date. The proposed line
c p 5 was reduced from a 36" RCP due to a potential sanitary sewer conflict. From there, 129 if of
g E o f . 24" RCP runs east along the main driveway to the junction box labeled J2, which collects the
v ri flow from the system leaving drainage area PA8 as well as the upstream lots. Service for the
future phases (III and IV) will be accommodated by a 21" RCP that will be partially
O completed (approx. 15610 and tied into when construction on the future phases begins.
> Finally, 32 if of 18" RCP will be tied into junction box PA7, which will be constructed with
Phase IIA. The 18" line (5OUT) will run from PA7 to a proposed inlet PA5 that will be
constructed as part of Phase IIB at a later date. At that point, the remaining 73 if of 18" RCP
will be added to complete the 105 If specified in the attached drainage analysis addendum
summary.
N O
Z di a The final design for Phase IIA of Waterwood Condominiums includes minor changes to the
W 2, n storm sewer infrastructure and the recreational amenities location. These changes include a
OC w• H revision of the drainage area boundaries provided in Exhibit B2. Drainage area PA -1 has been
ui subdivided into several smaller drainage areas including PA -1A, -1B, -IC and -1D. PA -1D
C F.. M includes a majority of the recreational amenities center and its associated parking. Updated
,� C I drainage area maps have been included with this letter. These changes do not have a
�.r+ 2 M significant impact to the post - development runoff peak flow rate. Infrastructural changes
W C 2 N 3 include the addition of approximately 2401f of 12" PVC pipe connecting the parking lot and
U . � IA n N recreational amenities to the detention pond inflow junction box. Grate inlets will also be
6 ' 4 n
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pl in the recreational area and in the parking. The attached maps include approximate
in V u.
ponding limits for all of the proposed parking areas and grate inlets for the 10 -, 25- and 100 -year
rainfall events as well as the approximate depth for each rainfall event. These ponding limits account
for the aforementioned infrastructure changes. Below are peak flowrate results for the culvert at
Krenek Tap Road, which serves as the drainage system study point, and water surface elevation
comparisons for the natural channel adjacent to the proposed Waterwood development.
Culvert Flow @ Krenek Tap Road (cfs)
Development 10 Year 25 -Year 100 -Year
Existing 169.62 204.03 262.37
Proposed 165.20 191.05 244.28
Proposed Revised (Phase IIA) 157.86 187.45 230.62
Peak Flow Change (Proposed) -4.42 -12.98 -18.09
Peak Flow Change (Proposed Rev) -11.76 -16.58 -31.75
10 -Year Upstream Water Surface Elevations (ft)
Development Existing Proposed Proposed Revised
Krenek Tap 266.37 266.32 266.24
1 +14 267.07 267.17 267.13
1 +38 270.70 270.63 270.65
2 +41 272.39 272.41 272.40
3 +89 277.14 277.14 277.14
25 -Year Upstream Water Surface Elevations (ft)
Development Existing Proposed Proposed Revised
Krenek Tap 266.78 266.63 266.58
1 +14 267.16 267.25 267.27
1 +38 270.75 270.68 270.70
2 +41 272.51 272.52 272.52
3 +89 277.27 277.28 277.28
100 -Year Upstream Water Surface Elevations (ft)
Development Existing Proposed Proposed Revised
Krenek Tap 267.40 267.21 267.05
1 +14 267.33 267.35 267.41
1 +38 270.81 270.76 270.73
2 +41 272.66 272.66 272.66
3 +89 277.45 277.45 277.45
Updated drainage area maps and spreadsheets have been included for your convenience. In
addition, a node and link location map of the Phase IIA is provided as Exhibit C and includes
identification of storm sewer that will be constructed as part of this phase. These storm sewer
lines are identified in red. If you have any questions or comments, please feel free to contact me.
Sincerely,
Terry M. Barr, EIT
Graduate Engineer
Cc: File
Jim Stewart, Owner
Attachments:
Drainage Area Maps
Node and Link Identification Map
Conduit Results Summary
JOE OF TF L 1
L �-`P • ••......, ..t,
� / * i N S
f VERONICA J. B. MORGAN
9 : 77689 ,
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ebibECA
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a C - 3- D S - 04
DLL Z 3
February 24, 2004
Spencer Thompson
City of College Station
c a, Development Services
i ? - I N
O P.O. Box 9960
t ,. c College Station, TX 77840
2 Y3 as tg
y ? N Re: Waterwood Condominiums Drainage Addendum — Phase 2A
V • � c 210
_ E ~ c Dear Spencer,
es i , 5 ca a The purpose of this letter is to detail the design changes in the proposed Waterwood
8 c • = a a Condominiums Phase IIA improvements and the subsequent effects on the proposed drainage
C c D. infrastructure detailed in the Waterwood Townhomes Drainage Analysis, Mitchell & Morgan,
C Q E 2003. Phase IIA includes the proposed recreational amenities along with the 3 -unit building
{Y 1.) fN cn and associated parking adjacent to Phase I. Per the original drainage analysis, changes to the
site layout are to be addressed in an addendum.
ui Proposed storm drainage infrastructure additions for this phase include the addition of
D• approximately 4001f of storm sewer detailed in the original report and 2001f of storm sewer
C` W that has since been added to accommodate drainage of the parking lot and the future
t) L D. recreational area. The proposed Phase IIA storm sewer consists of 85 if of 30" RCP from the
� c =
O existing inlet labeled PA1A north to the proposed junction box (PA7) to be located near the
F g z v proposed Phase IIB parking area, which will be constructed at a later date. The proposed line
c d E' was reduced from a 36" RCP due to a potential sanitary sewer conflict. From there, 1291f of
rim f a 24" RCP runs east along the main driveway to the junction box labeled J2, which collects the
its F , flow from the system leaving drainage area PA8 as well as the upstream lots. Service for the
.v E "' future phases (III and IV) will be accommodated by a 21" RCP that will be partially
O completed (approx. 15610 and tied into when construction on the future phases begins.
an
Finally, 32 If of 18" RCP will be tied into junction box PA7, which will be constructed with
Phase IIA. The 18" line (5OUT) will run from PA7 to a proposed inlet PA5 that will be
constructed as part of Phase IIB at a later date. At that point, the remaining 73 if of 18" RCP
will be added to complete the 105 if specified in the attached drainage analysis addendum
a. V' summary.
..1 N e0��
Z QO The final design for Phase IIA of Waterwood Condominiums includes minor changes to the
�
4 3 n storm sewer infrastructure and the recreational amenities location. These changes include a
O AX revision of the drainage area boundaries provided in Exhibit B2. Drainage area PA -1 has been
to dl subdivided into several smaller drainage areas including PA -1 A, -1B, -IC and -1D. PA-1D
4‘ Q F.. � includes a majority of the recreational amenities center and its associated parking. Updated
drainage ,� �b� area maps have been included with this letter. These changes do not have a
J + O $ M s impact to the post - development runoff peak flow rate. Infrastructural changes
include the addition of approximately 2401f of 12" PVC pipe connecting the parking lot and
1 1 t " recreational amenities to the detention pond inflow junction box. Grate inlets will also be
W 0 km placed in the recreational area and in the parking. The attached maps include approximate
IT ii‘ wi O e K
ponding limits for all of the proposed parking areas and grate inlets for the 10 -, 25- and 100 -year
rainfall events as well as the approximate depth for each rainfall event. These ponding limits account
for the aforementioned infrastructure changes. Below are peak flowrate results for the culvert at
Krenek Tap Road, which serves as the drainage system study point, and water surface elevation
comparisons for the natural channel adjacent to the proposed Waterwood development.
Culvert Flow @ Krenek Tap Road (cfs)
Develo . ment 10 -Year 25 -Year 100 -Year
Existing 169.62 204.03 262.37
Proposed 165.20 191.05 244.28
Proposed Revised (Phase IIA) 157.86 187.45 230.62
.` Tom. . ..., „.aeIT'V'.e
Peak Flow Change (Proposed) -4.42 -12.98 - 18.09
Peak Flow Change (Proposed Rev) -11.76 -16.58 -31.75
10 -Year Upstream Water Surface Elevations (ft)
Development Existin: Pro. osed Proposed Revised
Krenek Tap 266.37 266.32 266.24
1 +14 267.07 267.17 267.13
1 +38 270.70 270.63 270.65
2 +41 272.39 272.41 272.40
3 +89 277.14 277.14 277.14
25 -Year Upstream Water Surface Elevations (ft)
Development Existing Pro. osed Pro Revised
Krenek Tap 266.78 266.63 266.58
1 +14 267.16 267.25 267.27
1 +38 270.75 270.68 270.70
2 +41 272.51 272.52 272.52
3 +89 277.27 277.28 277.28
100 -Year Upstream Water Surface Elevations (ft)
Develo. ment Existing Pro. osed Pro osed Revised
Krenek Tap 267.40 267.21 267.05
1 +14 267.33 267.35 267.41
1 +38 270.81 270.76 270.73
2 +41 272.66 272.66 272.66
3 +89 277.45 277.45 277.45
Updated drainage area maps and spreadsheets have been included for your convenience. In
addition, a node and link location map of the Phase IIA is provided as Exhibit C and includes
identification of storm sewer that will be constructed as part of this phase. These storm sewer
lines are identified in red. If you have any questions or comments, please feel free to contact me.
Sincerely,
Terry M. Barr, EIT
Graduate Engineer
Cc: File
Jim Stewart, Owner
Attachments:
Drainage Area Maps
Node and Link Identification Map
Conduit Results Summary
rS�P� �' .....TT 9
/ *. . * g
VERONICA J. B. MORGA
C . 77689 , :'
t � �F ` S .0.... TE� I /
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