Item 6 - Applicant's Presentation rmg
Methodist
HosDite- 1
Detention Basin Replacement Project
Planning & Zoning Commission Presentation
ZA21-0016
0
Methodist LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rmg Objective & History
■ Seeking approval to undertake replacement of the existing underground
detention system installed in 2013.
■ Originally planned and approved circa 2009 as a surface detention basin.
■ Developer proposed underground detention system circa 2011 to address
additional parking structure to be constructed in Phase 1.
■ Underground drainage system proposed by Contractor and Civil Engineer
and presented to City of Southlake by ADS StormTech (mfg.) as a viable
underground detention system.
■ Use of system approved by City of Southlake and formally accepted in
January 2014 as an alternative to standard above ground detention.
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Methodist LANDPLAN
SOLITHLAKE HOSPITAL DEVELOPMENT
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Methodist LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rmg Problems & Investigations
■ Existing underground detention system has suffered a failure.
— Bed 3 and Bed 4 of the 4-bed system affected.
■ Damage includes:
— Settlement and cracking of Fire Lane and ground above.
— Buckled, wracked and breached chambers.
— Trapped water beneath impermeable layer and underdrain displacement.
■ Investigations determined the following:
— Complete removal required. Replacement with similar system not
feasible. Future development adversely impacted.
— Replacement with surface detention system best solution possible.
Presents least possibility of future issues.
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Methodist LANDPLAN
SOUTHLAKE HOSPITAL DEVELOPMENT
rmg Solution
■ Proposed solution includes:
— Removal of existing system, design and installation of new system.
— Installation of new pipe, gravity stone retaining wall and safety fence.
— Installation of new landscape per buffer yard requirements.
— Installation of enhanced landscape features for screening.
— Repair of affected fire lanes, landscape and irrigation.
■ Proposed solution conforms to approved Concept Plan and is permitted by
current zoning SP2.
■ Proposed solution improves existing area, enhances views from Highway and
screens views into basin structure.
■ City requires detention but does not mandate type of detention (above
(,ground vs underground). 4
Methodist LANDPLAN
SOUTHLAKE HOSPITAL DEVELOPMENT
rmg Approved Concept Plan
Location of proposed surface D.MXEDUSE
detention basin conforms to
PROPOSE - - - Approved Concept Plan.
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RGR'N L ANDP LAN
SOLITHLAKE HOSPITAL DEVELOPMENT
rmg Concept Plan — Existing Conditions
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� LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rmg Concept Plan — Master Plan Conditions
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Methodist �,°�
us€ LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rm Concept Plan Enlarged
POND OUTFACE JUNCTION BOX DETAILS
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Methodist LANDPLAN
SOUTHLAKE HOSPITAL DEVELOPMENT
rm Concept Plan Landscape
ST PLANT SCHEDULE
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Methodist -
L-200 LANDPLAN
SOLITHLAKE HOSPITAL DEVELOPMENT
rmg Landscape Material
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Methodist LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rmg Detention Basin Section A-A
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State Highway 114 aiatinq ft.,N. Key Map
t EAsting Thol Pedeshlan Sight Line Land—i a Screen landings along Property line
} Lineparty Vehicular Sight Line etention Pond ropoead Retaining Wall _
Enhanoetl Plantings F1.11 RailR~W
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! MSH - Southlake Detention Basin
Methodist Southlake Hospital,421 E.State Hwy 114
O l;6 Southlake,TX 76092
Methodist lili;
L ANDPLAN
SOUTHLAKE HOSPITAL DEVELOPMENT
rmg Detention Basin Section B-B
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! MSH - Southlake Detention Basin KKx
O j g Methodist Southlake Hospital,421 E.State Hwy 114 U)
Southlake,TX 76092
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Methodist
L ANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rmg Detention Basin Section C-C
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MSH - Southlake Detention Basin U
Methodist Southlake Hospital,421 E.State Hwy 114
Southlake,TX 76092
Methodist
L ANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT
rMg Detention Basin Rendering — View South, Frontage Rd .
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Before
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Methodist LANDPLAN
SOUTHLAKE HOSPITAL DEVELOPMENT
rmg Conclusion
■ Concept in keeping with the original approved Concept Plan.
■ Use of surface detention not prohibited by SP2 Zoning or Zoning Ordinance
No. 480-527.
■ Detention basin structure not visible from Hwy. 114 or Frontage Road.
■ Existing area will be improved and enhanced from its original Concept Plan.
■ Enhanced landscape will improve views from the Hwy. 114 and Frontage
Road.
■ Addresses the concerns of the Corridor Planning Committee.
0 4
Methodist LANDPLAN
SOLITHLAKE HOSPITAL DEVELOPMENT
rmg
Quest *ions
ZA21-0016
0
Methodist LANDPLAN
SOUTHLAKE HOSPITAL
DEVELOPMENT