STORMWATER PRESENTATION 4-22
2 MB Posted
- Attached to
- Wayfinding and Gateway Monument Design
- Solicitation number
- 2022-020
- Issued by
- Dekalb County, Georgia
About this file
This is a stormwater presentation document related to the City of Stonecrest, Georgia's RFP 2022-020 for Wayfinding and Gateway Monument Design. The scope of work encompasses five primary tasks: inventory and assessment of current signage and destination points; recommendations for gateway and wayfinding policies and criteria; establishment of graphic design standards; development of a complete wayfinding plan with four design concepts for pedestrian, cyclist, and motorist audiences; and preparation of sign specifications and bid documents for fabrication and installation. Gateway monumentation designs must be detailed enough to serve as construction bid documents. The strategy will establish consistent standards adaptable to existing destinations and future development, expressed through community identity on signage, light poles, landscaping, and other visual elements within and adjacent to city entrances and public rights-of-way. Proposals were due December 21, 2022 at 2:00 p.m., with questions due by December 5, 2022 at 5:00 p.m. The contract award was anticipated for City Council approval on February 6, 2023, with notice to proceed on the same date.
The contract pricing structure is lump sum as proposed, with invoices paid within thirty days of receipt. The City does not impose sales taxes on contracted services. The contract term commences upon execution through the end of the calendar year, with automatic renewal capability for a total term not exceeding five years unless either party provides thirty days' written notice of non-renewal. Evaluation uses a 100-point scoring system: Project Personnel (25 points), Project Experience (25 points), Project Understanding and Approach (30 points), and Cost Proposal (20 points). Awards are evaluated on a best-value basis. Successful contractors must provide workers' compensation, general liability ($1,000,000), automobile liability ($500,000), and umbrella liability ($1,000,000) coverage, with the City named as additional insured. The City strongly encourages small business and minority and women-owned business participation. Contractors must comply with the Georgia Security and Immigration Compliance Act and register with the federal E-Verify program. MERJE was identified as the award recipient.
Text of this file
City of Tucker
Stormwater Asset Assessment
April 2022
• Review available data to assess the existing condition of stormwater system assets.
• Assets include detention ponds, pipes, stormwater structures and dams.
Purpose
• Local control and efficiency
• Fees collected in the city used for improvements in the city
• Concerns addressed sooner, before solutions become larger and more expensive
Introduction/Benefits
• 71 Detention Ponds with County Maintenance Responsibility.
• 2020 Inspection
Detention Ponds
Overall Condition
0 5 10 15 20 25
Unknown
Poor
Fair
Excellent / Good
• Unknown ponds were typically not found in GIS or in the field or the inspector could not gain access to the site.
Outlet Control Structure
(OCS):
8 of 54 (11%) inspections documented OCS concerns.
• DeKalb County stormwater database identified the following pipe types:
– Aluminized Steel
– Corrugated Metal Pipe (CMP)
– HDPE
– Reinforced Concrete Pipe
– Other
Pipes
Material Length (miles) Percent of Network Average Age Average Service Life
Aluminized Steel 2.8 2% 19 years 75-100 years
Corrugated Metal Pipe
90.5 60% 34 years 30-40 years
HDPE 6.5 4% 22 years 50 years
Reinforced Concrete Pipe
47.2 32% 33 years 70-100 years
Other 2.6 2% N/A N/A
Pipe Age Summary by Type
Corrugated Metal Pipe Age Summary 5%
15%
39%
36%
5%
<20 20-30 30-40 40-50 50+ Age in years
Pipes
Average Service Life of CMP Pipe: 30 to 40 Years
Condition Count
Good 4244
Low Priority 390
Medium Priority 260
High Priority 389
Other 263
Pipe inventory taken from 2007 to 2010
Corrugated Metal Pipe Condition Summary
Structures
• DeKalb County stormwater database identified the following structure types:
– Catch Basin
– Drop Inlet
– Headwall
– Junction Box
– Other
Structure Type # of Structures % of Total
Catch Basin 3,058 22.09%
Drop Inlet 2,893 20.90%
Headwall 3,806 27.49%
Junction Box 2,496 18.03%
Other 1592 11.50%
20.13%
21.99% 41.08%
16.79%
Age of Structures
< 20 Years 20-30 Years
30-40 Years >40 Years
68.91%
9.50%
5.18%
4.48% 11.94%
Condition of Structures
G - Good 3 - Low Priority
2 - Medium Priority 1 - High Priority
Other
• Kelley Cofer Dam
- Category II Dam at Kelley Cofer Park
- Dam also serves as N. Park Dr
• Twin Brothers Dam
- Two Dams in Johns Homestead Park
• Lake Erin Dam
- Category 1 Dam at Henderson Park
Dams
• Category II Dam – Not subject to state regulations
• 2021 United Consulting Lake Evaluation
– Addressed lake condition/water quality
– Most measures of water quality within acceptable ranges
– Silt deposits were primary concern
– Dredging would improve water quality, appearance and detention capacity.
Kelley Cofer Park Dam
Source: Tucker Observer, Photo by Dean Hesse. (October 13, 2021)
• Category II Dam – Not subject to state regulations
• Project established to improve both lakes/dams and to provide additional recreation opportunities
– Georgia DNR grant application in second-level application stage. Grant amount of $2.5 million.
Twin Brothers Lake Source: AECO
M Tw in Brothers Lake D am
Alternatives Study
Compliance Issues
• Portions of the auxiliary spillway walls require repair.
• Fallen trees at the toe of the dam have created holes in the embankment requiring repair.
• Instrumentation casings require replacement or repair.
• Soils in downstream face of the dam require evaluation, possibly requiring remediation.
Maintenance Issues
• Dam and adjacent areas overgrown.
• Seepage present. Requires monitoring for potential changes.
Lake Erin Dam at Henderson Park
Source: Letter from Georgia EPD to DeKalb County. (April 4, 2018)
Next Steps
• Review current stormwater fee and current level of investment by DeKalb County in Tucker stormwater maintenance.
• Establish general pricing estimates for deferred maintenance, particularly for Corrugated Metal Pipe.
• Research additional information regarding any dam concerns.
• Perform spot field investigations if needed.
Questions?
| Slide Number 1 |
| Purpose |
| Introduction/Benefits |
| Detention Ponds |
| Detention Ponds |
| Detention Ponds |
| Pipes |
| Pipes |
| Corrugated Metal Pipe Age Summary |
| Corrugated Metal Pipe Condition Summary |
| Structures |
| Structures |
| Structures |
| Structures |
| Structures |
| Structures |
| Dams |
| Kelley Cofer Park Dam |
| Twin Brothers Lake |
| Lake Erin Dam at Henderson Park |
| Next Steps |
| Slide Number 22 |
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