B08_Attachment_1_-_Enclosure_1.pdf
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- Solicitation number
- 140P3021Q0046
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This document provides an analysis of woody debris accumulation and tree management needs at multiple aqueduct structures along the Chesapeake and Ohio Canal National Historical Park. Site visits and observations were conducted at the Seneca, Monocacy, Catoctin, and Conococheague Aqueducts identifying full and partial debris obstructions reducing water flow and access. Eight trees are recommended for removal with debris removal and wood chipping at Catoctin Aqueduct.
The related federal contract opportunity is soliciting proposals for woody debris management along the C&O Canal National Historical Park Aqueducts. The Department of the Interior National Park Service is seeking debris removal and tree management services to address accumulated wood and vegetation obstructing the Seneca, Monocacy, Catoctin, and Conococheague Aqueduct structures as detailed in the analysis. Proposals are due by the listed solicitation number and closing date.
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Enclosure 1: Aqueduct Debris Overview
UPDATED BY JASON GILLIS 30 APR 21
Debris Analysis: Seneca Aqueduct 1 of 2
Boat ramp
Debris Analysis: Seneca Aqueduct 2 of 2
OBSERVATION: Full obstruction just below the waterline creating logjam.
Partial access constriction for watercraft accessing the Potomac River.
Comprehensive debris field “delta” developing against jam with adjacent shoreline accumulation w/ potential for rapid expansion. Invasive vegetation on stone structure.
Aqueduct Analysis: Monocacy Aqueduct 1 of 3
Aqueduct Analysis: Monocacy Aqueduct 2 of 3 Maryland 28 Bridge Upstream Debris Field (1.70 Miles)
OBSERVATION: Large upstream debris field accumulated at MD DOH HWY 28 bridge.
Highwater has high probability of moving the debris field downstream to the partially obstructed aqueduct barrels. THIS IS NOT PART OF THE
WORK REQUIREMENT, BUT SERVES TO INFORM
THE CONTRACTOR OF NEAR VICINITY DEBRIS IN
ORDER TO INFORM ANNALYSIS OF
ACCUMULATION POTENTIAL AT THE MONOCACY
AQUEDUCT.
Aqueduct Analysis: Monocacy Aqueduct 3 of 3
OBSERVATION: Developing logjam and delta effect with broad submerged obstruction (tip of iceburg comparison). Potential for rapid expansion during high water events exacerbated by the proximity of MD 28 HWY bridge debris field.
Aqueduct Analysis: Catoctin Aqueduct 1 of 2
Access Point: Must cross CSX tracks off Lander Rd.
Aqueduct Analysis: Catoctin Aqueduct 2 of 2
OBSERVATION: Two of three barrels have complete obstruction diverting all hydrological action through the partially obstructed center barrel.. Accumulation of subsurface debris field and biomass.
Aqueduct Analysis: Catoctin Tree Management 1 of 8
Remove Tree and all debris from park.
Haul all wood chips Grind stump to a minimum depth of 8 inches.
Safety Standard: ANSI Z133 (most current)
Aqueduct Analysis: Catoctin Tree Management 2 of 8
Haul all wood chips. Cut stump flush 2-3 ft above grade.
Aqueduct Analysis: Catoctin Tree Management 3 of 8
Haul all wood chips. Cut stump flush 2-3
Aqueduct Analysis: Catoctin Tree Management 4 of 8
Haul all wood chips. Cut stump flush 2-3
Aqueduct Analysis: Catoctin Tree Management 5 of 8
Haul all wood chips. Cut stump flush 2-3
Aqueduct Analysis: Catoctin Tree Management 6 of 8
Haul all wood chips. Cut stump flush 2-3
Aqueduct Analysis: Catoctin Tree Management 7 of 8
Haul all wood chips. Cut stump flush 2-3
Aqueduct Analysis: Catoctin Tree Management 8 of 8
Haul all wood chips. Cut stump flush 2-3
OPTION Aqueduct Analysis: Cononcocheague Aqueduct 1 of 2
Aqueduct Analysis: Catoctin Aqueduct 2 of 2
OBSERVATION: There are submerged pieces of the aqueduct structure that appear to be supporting the center debris field. There are multiple pieces of large submerged wood and bank accumulation.
Large piece of debris on Potomac side of structure.
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