HomeMy WebLinkAboutStaff Review 3
STAFF REVIEW COMMENTS NO. 1
Project: GREENS PRAIRIE CENTER PH.2C (FP) - 07-00500131
PLANNING
1. It is Staff's understanding that Phase 2C, the future realignment of Arrington Road, is no
longer being considered a separate phase but will remain part of Phase 2A. Please
confirm.
2. The current application may be revised such that it becomes a final plat of Phase 2A instead
of Phase 2C. If so desired, revise the application and plat and note future correspondence
as a final plat for Greens Prairie Center Ph. 2A, referencing project # 07-131. Due to the
magnitude of the revision, please submit all documents required for a final plat submittal.
3. Please state if it is your intent to be place the final plat on the July 19th P&Z meeting. If not,
please provide the anticipated meeting date and submit revisions that meet the deadline
date for it.
4. The construction documents and reports are still under review and may affect the plat.
Reviewed by: Jason Schubert Date: June 27, 2007
ENGINEERING COMMENTS NO. 1
1. The required 100' ROW for rural collectors is shown on the Final Plat, but is not reflected in
the construction plans. Please rectify.
2. Coordination will be necessary with the County. The City can issue a letter indicating
approval conditional upon the County Engineer's approval of the improvements beyond the
City Limits. The City will stamp the construction plans for the infrastructure within the City
Limits upon receipt of the mentioned County's approval.
3. Show revised alignment of proposed "Old Arrington Road" as discussed.
4. Final Plat shows 3.7 acres, Drainage Report 3.4. Please clarify.
5. How did you arrive at runoff coefficient of .55?
6. Define/delineate conveyance pathway.
7. Is there capacity in the existing bar ditch? You are discharging a 27" into an existing
downstream 18" culvert. Verify capacity in bar ditch down to Primary receiving stream.
County says there is a capacity issue and flooding problem.
8. What is depth of water into and end treatment for Pipe 3? Will all the water from the existing
ditch be routed through this pipe?
9. What is depth of water into culvert crossing Greens Prairie Road? Provide flowline all the
way to flowline of existing pipe.
10. What is status of regional detention pond?
Reviewed by: Carol Cotter/Alan Gibbs Date: June 26, 2007
ELECTRICAL COMMENTS REQUIRING IMMEDIATE ATTENTION
1. Developer provides temporary blanket easement for construction purposes.
2. Developer provides easements for electric infrastructure as installed for electric lines
(including street lights).
GENERAL ELECTRICAL COMMENTS
1. Developer installs conduit per City specs and design.
2. City will provide drawings for conduit installation.
NOTE: Any changes made to the plans, that have not been requested by the City of College Station, must be
explained in your next transmittal letter and "bubbled" on your plans. Any additional changes on these plans
that have not been pointed out to the City,will constitute a completely new review. 2 of 3
3. Developer provides 30' of rigid or IMC conduit for riser poles. City installs riser.
4. Developer to intercept existing conduit at designated transformers and extend as required.
5. If conduit does not exist at designated transformer, developer to furnish and install conduit
as shown on electrical layout.
6. Developer installs streetlights as per City specs and design.
7. Developer provides digital AutoCAD 2000 or later version of plat and/or site plan. Email to
bread@cstx.gov.
8. To discuss any of the above electrical comments please contact Brent Read at
979.764.5026.
Reviewed by: Brent Read Date: June 7, 2007
FIRE
1. No comments
Reviewed by: Steve Smith Date: June 12, 2007
SANITATION
1. Sanitation is ok with this project.
Reviewed by: Wally Urrutia Date: June 7, 2007
NOTE: Any changes made to the plans, that have not been requested by the City of College Station, must be
explained in your next transmittal letter and "bubbled" on your plans. Any additional changes on these plans
that have not been pointed out to the City,will constitute a completely new review. 3 of 3
Response to
STAFF REVIEW COMMENTS NO. 1
Project: GREENS PRAIRIE CENTER PH.2C (FP) — 07-00500131
PLANNING
1. It is Staff's understanding that Phase 2C, the future realignment of Arrington Road, is no
longer being considered a separate phase but will remain part of Phase 2A. Please confirm.
That is correct. Phase 2C is now part of Phase 2A.
2. The current application may be revised such that it becomes a final plat of Phase 2A instead
of Phase 2C. If so desired, revise the application and plat and note future correspondence
as a final plat for Greens Prairie Center Ph. 2A, referencing project #07-131. Due to the
magnitude of the revision, please submit all documents required for a final plat submittal.
Noted. Phase 3 has been added since the proposed detention ponds are located in it. All
documents are being resubmitted.
3. Please state if it is your intent to place the final plat on the July 19th P&Z meeting. If not,
please provide the anticipated meeting date and submit revisions that meet the deadline
date for it.
It is our desire to place the final plat on the next available P&Z Meeting agenda.
4. The construction documents and reports are still under review and may affect the plat.
Noted.
ENGINEERING COMMENTS NO. 1
1. The required 100' ROW for rural collectors is shown on the final Plat, but is not reflected in
the construction plans. Please rectify.
The roadway is being constructed to the standards of a major collector, which requires an
80 ft ROW and 54'pavement. The plat has been changed to match the construction plans.
2. Coordination will be necessary with the County. The City can issue a letter indicating
approval conditional upon the County Engineer's approval of the improvements beyond the
City Limits. The City will stamp the construction plans for the infrastructure within the City
Limits upon receipt of the mentioned County's approval.
Noted. The plans are being submitted concurrently to the City of CS and Brazos County for
review.
3. Show revised alignment of proposed "Old Arrington Road" as discussed.
The alignment has been changed.
4. Final Plat shows 3.7 acres, Drainage Report 3.4. Please clarify.
The new preliminary plat that is being resubmitted covers Phases 2A and 3. Phase 2A is
31.593 acres and Phase 3 is 16.894 acres. The drainage report was prepared to only
address the street and its associated appurtenances, including the detention ponds that
have been added with this submittal. The total area associated with these features
encompasses approximately 5 acres (street & ROW = 3.4 acres, ponds = 1.6 acres). The
remaining area in the two phases will be analyzed as they develop.
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5. How did you arrive at runoff coefficient of .55?
This has been a standard coefficient used on many residential development projects.
However, it was incorrectly used on this project. The runoff coefficient used for purposes of
modeling the storm drain system has been changed to 0.90 for the road right-of-way. Two
small drainage areas near the intersection with Old Arrington Road were left at 0.55
because they encompass portions of the site that will be a combination of grass cover and
asphalt pavement.
6. Define/delineate conveyance pathway.
While it is not entirely clear what is requested here, note that the design of the drainage
system has significantly changed as described in the following comment response. Runoff
from the streets is conveyed to the detention ponds, then into clearly defined outfall
systems. The revised design should address the conveyance pathway question presented
with this comment.
7. Is there capacity in the existing bar ditch? You are discharging a 27" into an existing
downstream 18" culvert. Verify capacity in the bar ditch down to Primary receiving stream.
County says there is a capacity issue and flooding problem.
In order to address this comment, as well as the subsequent three comments, the drainage
design has been altered to include detention ponds on the north and south ends of the
project. The pre-development flows and post-development flows are shown in the drainage
report. The post-development flows are greatly reduced from the existing condition. The
bar ditch along Old Arrington Road is the only access this property has to an outfall. As you
will see, the outfall pipe from the pond is a 4'x 2'box culvert that will replace the 18"culvert
and allow water to pass to the natural channel south of South Oaks Drive.
An analysis of the stream's capacity down to the Primary receiving steam was not
conducted, and no channel modifications to the tributary are being proposed. It is assumed
that by significantly lowering the volume of water leaving the site, no additional flooding will
occur as a result of this construction. Instead, flooding problems should be greatly reduced
as a result of these drainage improvements.
8. What is depth of water into and end treatment for Pipe 3? Will all the water from the existing
ditch be routed through this pipe?
The piping system has changed. Please refer to the revised construction plans and report.
9. What is depth of water into culvert crossing Greens Prairie Road? Provide flowline all the
way to flowline of existing pipe?
The piping system has changed. Please refer to the revised construction plans and report.
10. What is status of regional detention pond?
Construction of the regional detention pond was not required for the first development
project. The ponds shown in this submittal are intended to be temporary, although it is not
known how long they will be in place. As users of the surrounding property are identified
and plans for the land become better defined, permanent locations of the detention ponds
that will ultimately serve this area can be determined.
A revised Engineer's Estimate is provided that reflects the modifications noted above.
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ENGINEERING COMMENTS NO. 2
1. Provide slopes of design grades (Profile-Old Arrington Road).
2. Provide design curve data for vertical curve around Stat 3+00 (Profile-Old Arrington
Road).
3. K value is below minimum for crest at Stat 1+50 (Profile-Old Arrington Road).
4. Provide design curve data for vertical curve around Stat 1+00 (Profile-Old Arrington
Road spur).
5. Vertical curve data is missing from Arrington Road after Station10+00.
6. Open ditch slope is 4:1 maximum for rural collector.
7. Show hydraulic grade lines in profile view.
8. Your Reference Statement on Page 3 of Drainage Report is not complete.
9. Construction will need to be coordinated with the County. I have not had any comments
back from Gary.
Reviewed by: Carol Cotter Date: February 4, 2008
STAFF REVIEW COMMENTS NO. 2
Project: GREENS PRAIRIE CENTER PH 2A & 3(FP) - 07-00500131
PLANNING
1. Please revise the plat by identifying the Volume and Page of all easements dedicated
through a separate instrument.
Reviewed by: Jason Schubert Date: January 21, 2008
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STAFF REVIEW COMMENTS NO. 2
Project: GREENS PRAIRIE CENTER PH 2A & 3 (FP) - 07-00500131
PLANNING
1. Please revise the plat by identifying the Volume and Page of all easements dedicated
through a separate instrument.
2. The construction documents and reports are still under review and may affect the plat.
Reviewed by: Jason Schubert
Date: January 21, 2008
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