East Branch Shipbuilder’s Creek Remediation Engineering Alternatives Analysis PREPARED BY: BARTON & LOGUIDICE
July 3, 2024
Agenda I.
Shipbuilder’s Creek and Infrastructure Condition
II.
Alternatives Analysis
III.
I.
In-Place Sewer Rehab with Localized Stream Restoration
II.
In-Place Sewer Rehab with Comprehensive Stream Restoration
III.
15” Sewer Realignment with Localized Stream Restoration
IV.
8” Sewer Relocation with Localized Streambank Stabilization
Recommendations
EAST BRANCH SHIPBUILDER’S CREEK
Alternative 1: In-Place Sewer Rehab with Localized Stream Restoration Summary: • CIPP lining of 150 LF of 15” and 385 LF 8” pipe with concrete encasement of pipe within stream extents • 650 linear feet of stream channel restoration and bank stabilization with minor alignment changes; use combination of ‘soft’ and ‘hard’ restoration techniques to protect infrastructure Draft Costs: • Sewer: $150,000 • Stream: $530,000 • Total: $670,000
Alternative 1: In-Place Sewer Rehab with Localized Stream Restoration
Alternative 1: In-Place Sewer Rehab with Localized Stream Restoration Permitting: • Joint Application for Section 404 and Article 15 Protection of Water Permits (USACE and DEC) Funding: • (WQIP) Non-Agricultural Nonpoint Source Abatement and Control • Maximum Award of $1,000,000 requiring 25% local match Other Implications: • Requires access to manholes for lining (least intrusive alternative) • Repairing existing infrastructure – most likely easiest permitting alternative • Hydraulic analysis of floodplain to confirm ‘no rise’ in Base Flood Elevations
Alternative 2: In-Place Sewer Rehab with Comprehensive Stream Restoration Summary: • CIPP lining of 150 LF of 15” and 385 LF 8” pipe with concrete encasement of pipe within stream extents • 1,800 linear feet of geomorphic stream restoration and floodplain reconnection between Five Mile Line and Lindsey Circle; uses natural restoration techniques and limits ‘hard’ bank protection to critical infrastructure locations Draft Costs: • Sewer: $150,000 • Stream: $940,000 • Total: $1,090,000
Alternative 2: In-Place Sewer Rehab with Comprehensive Stream Restoration
Alternative 2: In-Place Sewer Rehab with Comprehensive Stream Restoration Permitting: • Joint Application for Section 404 and Article 15 Protection of Water Permits (USACE and DEC) Funding: • (WQIP) Non-Agricultural Nonpoint – Multiple Project Categories • Maximum Award of $4,000,000 requiring 25% local match Other Implications: • Requires access to manholes for lining (least intrusive alternative) • Repairing existing infrastructure – most likely easiest permitting alternative • Hydraulic analysis of floodplain to confirm ‘no rise’ in Base Flood Elevations
Alternative 3: 15” Sewer Realignment with Localized Stream Restoration Summary: • Install new 15” sewer across Shipbuilders Creek and two new manholes • 650 linear feet of stream channel restoration and bank stabilization with minor alignment changes; use combination of ‘soft’ and ‘hard’ restoration techniques to protect infrastructure Draft Costs: • Sewer: $390,000 • Stream: $530,000 • Total: $920,000
Alternative 3: 15” Sewer Realignment with Localized Stream Restoration
Alternative 3: 15” Sewer Realignment with Localized Stream Restoration Permitting: • Joint Application for Section 404 and Article 15 Protection of Water Permits (USACE and DEC) Funding: • (WQIP) Non-Agricultural Nonpoint Source Abatement and Control • Maximum Award of $1,000,000 requiring 25% local match Other Implications: • Does not meet 3’ cover over pipe – would require NYSDEC variance • Confirm extents of Town’s easement • Hydraulic analysis of floodplain to confirm ‘no rise’ in Base Flood Elevations
Alternative 4: 8” Sewer Relocation with Localized Streambank Stabilization Summary: • Install new 8” sewer along Five Mile Line, two new manholes, and two re-aligned laterals • 250 linear feet of in-place stream stabilization focused on protecting 15” sewer and manhole; includes protection of upstream streambanks to mitigate future erosion towards infrastructure Draft Costs: • Sewer: $780,000 • Stream: $170,000 • Total: $950,000
Alternative 4: 8” Sewer Relocation with Localized Streambank Stabilization
Alternative 4: 8” Sewer Relocation with Localized Streambank Stabilization Permitting: • Joint Application for Section 404 and Article 15 Protection of Water Permits (USACE and DEC) Funding: • (WQIP) Non-Agricultural Nonpoint Source Abatement and Control • Maximum Award of $1,000,000 requiring 25% local match Other Implications: • Storm Sewer and Water Main on W. side of Five Mile Line Rd. • Existing sewer ~14’ deep requiring deep excavation • Hydraulic analysis of floodplain to confirm ‘no rise’ in Base Flood Elevations
Alternatives Summary Alt. 1
Cost
Alt. 3
Alt. 4
CIPP and Local Stream Rehab
CIPP and Comprehensive 15” Sewer Realignment and 8” Sewer Relocation and Stream Rehab Local Stream Rehab Streambank Stabilization
$670,000
$1,090,000
$920,000
$950,000
Most Funding Potential
Intermediate Funding Potential
Least Funding Potential
Fundability Intermediate Funding Potential Notes
Alt. 2
• Least • Least Intrusive • Requires NYSDEC Intrusive • Lowest cost per linear variance • Highest cost foot of stream length • Highest cost per linear per linear • Reconnects floodplain foot of stream length foot of at lower elevation stream length
• Removes 8” from stream entirely • Deep sewer excavation/utility coordination • Limits streambank protection to areas immediately adjacent to infrastructure
Questions?
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