Warm Springs Hollow’s Street Storyboard Update (Jan 10,...
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Warm Springs Hollow’s Street Storyboard Update (Jan 10, 2018) 2017 Projects draft rev. b Introduction Warm Springs Hollow streets are private. We must maintain them - neither Boise City nor Ada County will. They have been and continue to rapidly degrade. Streets are typically designed for 25 year life. We’ve luckily enjoyed almost 40 years of life. A Road Committee has been investigating repair alternatives and communicating findings to the HOA board and Infrastructure committee for their input. In December (2017) KM Engineering was hired to survey, define needs and provide cost information for an efficient economical rebuild plan. Functioning streets are a basic necessity and important in order to maintain property values. Potential home buyers expect cars, bikes, and our feet to have functioning streets. Prospective buyers must be informed that additional funds will be required to rebuild the streets.
Transcript of Warm Springs Hollow’s Street Storyboard Update (Jan 10,...
Warm Springs Hollow’s Street Storyboard Update (Jan 10,
2018)
2017 Projects draft rev. b
Introduction
Warm Springs Hollow streets are private. We must maintain them - neither Boise City nor Ada County will. They have been and continue to rapidly degrade.
Streets are typically designed for 25 year life. We’ve luckily enjoyed almost 40 years of life. A Road Committee has been investigating repair alternatives and communicating findings to the HOA board and Infrastructure committee for their input.
In December (2017) KM Engineering was hired to survey, define needs and provide cost information for an efficient economical rebuild plan.
Functioning streets are a basic necessity and important in order to maintain property values. Potential home buyers expect cars, bikes, and our feet to have functioning streets.
Prospective buyers must be informed that additional funds will be required to rebuild the streets.
2017 Projects draft rev. b
Warm Springs Hollows Streets Storyboard
What’s this storyboard about?
The winter of 2016/2017 took a heavy toll on our streets. Snow, rain and ice combined with drainage issues and multiple freezing cycles caused severe asphalt cracking, breakup, heaving and sinking. It is rapidly degrading and requires rebuilding.
Rebuilding will require removal of streets and base down 12-1/2 inches. Curbing will be affected and perhaps driveway entries as well.
The cracked pieces resembling an alligator’s back are loose pieces and will break out.
The following pictures show the wide spread deterioration, drainage issues and what the future holds.
2015 Reserve Study PictureCoston Entry
January 2018 Picture
Coston Entry
ROADWAY CHANGES IN THE LAST 2-1/2 YEARS
ROADWAY CHANGES IN THE LAST 2-1/2 YEARS
2015 Reserve Study Picture Coston Entry
January 2018 Picture
Coston Entry
Road Surface Break-Up (2017)
Drainage Issues allowing water penetration Coston & Lentz Intersection (2017)
More standing water and cracking (“alligatoring”/2017)
Curbs & ValleysBreaking & Raising (2017)
Road Surface and Underlayment Sinking
(2017)
Going ForwardThere are so many bad areas that repairing will become extremely difficult and expensive. Sealing may help some but presents a tradeoff in spending vs saving to rebuild. We should save our money and put it towards rebuilding the roads ASAP.
What happens next Examples
What we know about our roads
2017 Projects draft rev. b
We have spoken to four engineering firms, one road construction company, and our past sealing company.
We learned that the underlayment base is compromised and will need to be rebuilt.
The reserve study provided costing for a 2” overlay but this is not viable. It would fail within a few years.
Rebuilding the base and road will be expensive and disruptive (need to be excavated down 12-1/2”)
Costs will be higher (2 – 3X?) than an overlay (Reserve study showed ($4439 per home for overlay).
Boise city requires that we contain water runoff within our boundary rather than into the south lateral.
Test holes and survey done fall’17/spring’18 will help generate a budget for rebuild costs.
A project cost estimate should be available so owners can determine how to fund construction in June 2018.
A Warm Springs Hollow Capital Projects Task Force has looked at the road issue as part of their project scope. See the March 14, 2017 report on the following page.
WSH Roads Geotek Evaluation & Drainage Recommendations (Nov.
3, 2017)
Key Takeaway – Based upon road & base samples taken, soil sample excavation, laboratory testing and geological constraints and engineering evaluation full depth reconstruction during dry season is recommended.
Layers Current Depth RequiredAsphalt 1-1/2 to 3” 2-1/2”Aggregate Base 2-1/2 to 9-3/4” 4” Subbase 8 to 22-1/2” 6”
Layers Current Material RequiredAsphalt Cracking, failing, etc.Aggregate Base ¾ “ crushed * ¾” minusSubbase ¾ - 6” ** 4” minus
Ground water will adversely affect water containment options as Boise has a more strict requirement than the state. Additional water level testing to be done (Nov./Mar./Apr./May./Jun.).
* Poorly graded ¾” with silt & sand**Mixture of silt, sand & ¾, 2, 3, & 6” rock – poorly graded
Warm Springs Hollow Roadway Project
Project Phase 1 – Estimate the Project Cost
Activity Status Cost
Geotechnical Evaluation
Examines Road & Base 10 - road base samples
Determine Ground Water Level 2 - water level holes monitored $6,640
Asphalt & base failures Water @ 7–8.5 feet.
Mar/Apr/May/Jun monitoring TBD
Engineer Partner Selection December KM Eng.
Survey (Road/Drainage Change) January ~ $12,000
Owner Meeting – Road Status (Kelly) January 24th NA
Develop Project Budget Estimate February – June ~ $6,000
Phase 1 budget $24,640
Funding Study (How/what to fund) March/April NA
Utility Renewal plan kickoff Oct - June
Boise Warm Sprs. Water Dist. March/April BWSWD board mtg.
Cable1, Id Pwr., Suez, Initiate contact
Century Lk., Intermtn. Gas,
Boise Sewer
Home Owners Input Collection April/May NA
and Communications
Funding Vote June
