Panama City Marina City of Panama City, Florida

Transcription

1 Panama City Marina City of Panama City, Florida MARINA BULKHEAD ASSESSMENT October 3, 2011 Prepared For: Prepared By: 543 Harbor Boulevard, Suite 204 Destin, Florida DRAFT - 12/19/2011

2 Panama City Marina Marina Bulkhead Assessment 1.0. Introduction Panama City Marina (Figure 1.1) is one of the City of Panama City s (City) greatest assets which provide a mix of economic, recreational, and transportation opportunities and benefits to the community and its users. Located on St. Andrews Bay the Panama City Marina provides boaters with a calm and protected harbor. The upland public access points provide the general public with panoramic views of the scenic waters of St. Andrews Bay. However due to the age of the marina and upland infrastructure, attention is needed to increase the longevity of the facility and create additional opportunities and uses to benefit the City, residents, and businesses. The City is in the planning process to investigate cost-effective renovations and improvements to the existing Panama City Marina. MRD Associates, Inc. (MRD) has been tasked to perform a general Figure 1.1. Project Location assessment of the structural integrity of the existing concrete bulkhead. In addition, as a result of the proposed improvements to the marina uplands, this assessment will provide recommendations for the rehabilitation or replacement of the bulkhead and magnitude of cost Bulkhead Investigations The fundamental purpose of bulkhead investigation is to provide the information necessary to assess the condition (capacity, safety, and rate of deterioration) of the bulkhead, as well as to identify potential impacts to the bulkhead as a result of the proposed upland improvements. The entire length of the bulkhead will be assessed with special focus at the south-west end of T dock and the corner of the bulkhead near the Annex. Recommendations for required rehabilitation or replacement of the bulkhead and magnitude of cost will also be provided Site Overview and Existing Conditions The City owned and operated marina is located on the St. Andrews Bay adjacent to downtown. The marina is bounded to the north-east by the City buildings with adjacent parking. The remaining three sides of the marina are open to St. Andrews Bay. Existing 240-slip marina facility designed for all classes of vessels, from 30 feet to 120 feet October 3, 2011 DRAFT - 12/19/2011

3 Panama City Marina Marina Bulkhead Assessment The marina is open for business 7-days a week and offers full-service fueling. The marina can accommodate vessels with 110/220 power and cable TV service at the slips. The marina s uncovered and covered slips are timber docks supported on timber and precast concrete piles. Timber and concrete mooring piles separate the slips. On the north-west and south-east openings into the marina are protected by vertical concrete breakwaters which provide wave attenuation from minor wave and boat wakes. The bulkhead that forms the 5,635 foot upland marina perimeter was constructed in the late 1950s over 55 years ago. Figure 2-1 provides a general schematic of the bulkhead, anchoring system and immediate upland walkway and parking/driveway, and consists of: a concrete 12-inch to 16-inch thick and 30-inch wide reinforced concrete panels; keyed panels and secured together at the top of the panels by a continuous 24-inch by 18- inch concrete cap; panels with unknown lengths and embedment depths; and, a dead-man anchoring system. Based on limited information provided the City, the bulkhead is supported by in-earth anchors (tie-rods, concrete dead-man and concrete walers). Figure 2.1. Typical Bulkhead Cross-section 2.2. Assessment of Existing Bulkhead Structural Conditions The analysis was performed utilizing information: a) provided by the CITY; b) collected by students from NDSTC Class MEDO/UCTB/2C who performed a preliminary underwater inspections on June 22, 2011; and, c) an above water visual assessment performed by MRD on October 11, 2010 and August 30, 2011 which is the primary source of information. The documented conditions are October 3, 2011 DRAFT - 12/19/2011

4 Panama City Marina Marina Bulkhead Assessment relied solely on visual observations of the bulkhead and did not include detailed testing, capacity analysis, or forensic investigation. This investigation did not include below grade excavation or geotechnical coring; therefore, the conditions of a significant portion of the marina infrastructure remains unknown. This report serves as a preliminary baseline investigation to assist the City in the assessment of potential opportunities and/or impediments. Appendix A summarizes and itemizes original field notes with location identifiers and photographs Recommendations and Opinion of Probable Costs The following section of the report indentifies, summarizes, and provides preliminary opinions of probable costs for the marina bulkhead improvements, maintenance needs and/or replacement Summary of Repair and Replacement The bulkhead repair and replacement recommendations are included in this assessment to provide the CITY with sound engineering options to plan and budget for the future of this structure. A number of maintenance and repair items that may be necessary to sustain and improve the marina facility and upland improvements were identified. Based on this investigation, two types of corrective action is presented to increase the integrity of the parameter retaining (bulkhead) structure. The first would be to repair segments of bulkhead to minimize costs while increasing the longevity and aesthetics of the structure. The second is to replace entire 5,635 linear feet of concrete bulkhead with new parameter wall (bulkhead). The following provides a list of structural improvements for the bulkhead replacement and repairs to meet the project goals. The parenthetical reference point (S) is respective to the Sheet Numbers found in Appendix A, which further depicts the noted condition Repairs to the Existing Bulkhead Periodic maintenance on the existing bulkhead has occurred a number of times over the past 25 years to repair damage and prolong further deterioration of the structure. These efforts have increase the life of structure to over 55 years. Maintenance and repair items were identified during the recent site visits to correct current structural deficiencies and further increase the life of the structure. Based on these field assessments and the desk-top structural analysis of the existing bulkhead and anchoring system, the repairs identified below and the implementation of a maintenance program it is possible that the repairs will increase the life of the structure for another 10 years. However, even with this the structure is approaching the end of its life and will need to be replaced. The repairs to the bulkhead will include: Replace all loose, disconnected, or missing concrete walers Replace all failed anchor ties Replace cracked, damaged bulkhead concrete panels Seal all gaps between bulkhead panels Replace cracked and damaged concrete pile cap In addition, approximately 150 linear feet of bulkhead will need to be replaced due to the extensive deterioration of the structure October 3, 2011 DRAFT - 12/19/2011

5 Panama City Marina Marina Bulkhead Assessment Bulkhead Replacement The existing concrete bulkhead was designed and constructed in mid 1950's making the structure over 55-years old. This structure has exceeded the expected lifespan for a concrete bulkhead located in the saltwater environment. Based on documentation provided by the CITY, segments of the wall have been repaired several times due to damage and deterioration of the steelreinforced concrete structure. A new steel sheet-pile bulkhead will increase the longevity of the parameter retaining structure for another 50+ years. Steel over concrete, aluminum or composite is recommended due to the cost, performance, stability and ability to drive the sheet into the bay bottom. Maintenance of the new bulkhead will still be required, However, maintenance costs will be minimized over the life of the new structure with the implementation of a long-term annual inspection and repair program. The replacement of the bulkhead and tie-back system would include the following sequence: Removal of existing waler system; Removal existing steel-reinforced concrete pile-cap; Placement of clean fill and compaction; Installation of new sheet-pile just waterward (in front) of the existing bulkhead; Installation of tie-back (wall anchoring) system; and, Installation of a steel-reinforced concrete pile-cap Opinion of Probable Costs Preliminary opinion of probable costs are presented to assist the CITY in developing an implementation strategy and budgetary framework for the capital improvements to either continually repair or replace the existing bulkhead. It should be noted that the preliminary opinions of probable cost are based on limited information and the best judgment of MRD as a professional design firm familiar with the types of work proposed. While the Panama City is considering a number of upland site changes which would impact the upland area and the marina facility, the preliminary opinion of probable costs presented in this section are only for the repair or replacement of the parameter bulkhead without making significant changes to the marina configuration or in-water facilities. Appendix C provides a detailed, itemized breakdown of the opinions of probable costs. The reader should note, as an added buffer against price uncertainty at this level of analysis, the "Total Opinion of Probable Cost" in Appendix C include a +/- 15% range. Table 3.1 summarizes the preliminary opinion of probable cost figures and "Annual Cost". Table 3.1. Summary of Opinion of Probable Cost and Annual Cost Alternative Opinion of Probable Cost Annual Cost Repairs to the Existing Bulkhead $2,072,754 (1) $845,000 $19,480,695 Bulkhead Replacement $19,480,695 $795,000 (1) Assumes the replacement of the bulkhead in the 10th year October 3, 2011 DRAFT - 12/19/2011

6 Panama City Marina Repairs to the Existing Bulkhead Marina Bulkhead Assessment The recommended repairs to the existing bulkhead may increase the longevity of the structure by another 10 years or so. The preliminary opinion of probable costs are estimated between $1,761,841 (-15%) and $2,383,667 (+15%), with a mean value of $2,072,754 (Table C.1). However, due to the age of the structure (55 years+) the on-going annual maintenance of the structure will be required. Although these improvements will prolong the need to replace the entire bulkhead for the next 10 years, it is anticipated the 5,485 linear feet (the 150 feet repaired was deleted) bulkhead will eventually need to be replaced at an additional cost of $19,480,695 (in year one cost, see Section 3.2.2). In order to achieve the desired 50 year life for the new bulkhead, a yearly maintenance program should be developed and implemented. The Annual Cost of $845,000 (50 years, 8.0%) includes the initial repairs, construction of the replacement bulkhead and maintenance (assuming $10,000 per year for this assessment) Bulkhead Replacement The preliminary opinion of probable costs for the replacement of the entire 5,635 linear feet of bulkhead with a new steel sheet-pile wall is estimated between $16,558,591 (-15%) and $22,402,800 (+15%), with a mean value of $19,480,695 (Table C.2). As discussed in Section 3.2.1, in order to achieve the desired 50 year life for the new structure, a yearly maintenance program should be developed and implemented. The assessment assumes an annual maintenance budget of $10,000. The Annual Cost of $795,000 (50 years, 8.0%) includes construction of the replacement bulkhead in the first year and maintenance. Although a maintenance program is a capital investment and requires a dedicated funding and implementation strategy, not conducting such a maintenance program would reduce the Annual Cost. However, not maintaining the new bulkhead would require extensive and costly repairs in 20- to 25-years as historically experienced for this structure Conclusions The following provides a brief summary of findings: The concrete bulkhead is currently supporting the marina perimeter; however, some of these key component structures are showing signs of age, deterioration and require repair or replacement. The bulkhead was constructed in the mid 1950's and at this time it exceeds its life expectance which on an average runs approximately 30+ years. The field assessment and the review of the structural conditions of the bulkhead system did not indicate any problems that would require immediate remedial action. The marina facility can continue its current operations; however, the analysis of the site conditions suggest that the bulkhead will continue to deteriorate and may have less than five (5) year of life remaining before significant capital investments will be required. Based on this investigation, two types of corrective action is presented to increase the integrity of the parameter retaining (bulkhead) structure. The first would be to repair segments of bulkhead to minimize costs while increasing the longevity and aesthetics of the structure. The second is to replace entire 5,635 linear feet of concrete bulkhead with new parameter wall (bulkhead) October 3, 2011 DRAFT - 12/19/2011

7 Panama City Marina Marina Bulkhead Assessment The preliminary opinion of probable cost for the partial bulkhead replacement and repair is approximately $2,072,754 and $19,480,695 to replace the entire 5,635 linear foot bulkhead. It is recommended that the CITY replace the existing bulkhead rather than repairing sections. First, the Annual Cost for the replacement bulkhead is less than that for the repair (and eventual replacement) option. Replacing the bulkhead now rather than in the future (within the next 10 years) will minimize the disruption of activities along the new upland improvements, minimize costs associated with restoring the new upland facilities, and reduce further damage to the marina facility. However, a phasing plan can be developed to replace the bulkhead in the immediate area of need where upland improvements will be constructed and to meet any budget constraints October 3, 2011 DRAFT - 12/19/2011

8 Panama City Marina Marina Bulkhead Assessment APPENDIX A Survey of Existing Conditions October 3, 2011 DRAFT - 12/19/2011

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35 Panama City Marina Marina Bulkhead Assessment APPENDIX B NAVY Underwater Inspection Report October 3, 2011 DRAFT - 12/19/2011

36 Panama City Pier Inspection Report of Findings from 20JUN2011 DRAFT - 12/19/2011

37 Inspections focused on locating areas of discoloration, cracking, rusting, detection of any misalignments or movements of the seawall, and undermining at the wall s base. Overview On 20 June 2011, students from NDSTC class MEDO/UCTB/2C conducted Level I and II training inspections at the Panama City Marina. DRAFT - 12/19/2011 As per city s request, certain areas of the structure were keyed in as primary and secondary points of interest. Inspection results of these areas are detailed in the following slides.

38 Inspection Areas

39 General Inspection Results Wharf s depth averaged 15 with sand, mud, and shell bottom. Marine growth covered majority of the wall and was approximately 1-2 inches thick in most areas. The wharf was in overall good condition with some cracks, discoloration markings from rusting rebar, damage to concrete, and detached fender pieces (marked areas to follow). DRAFT - 12/19/2011 Exposed joints along concrete seams were identified in numerous locations In several areas, fenders were broken or hanging off the pier. These locations can be seen from the surface.

40 Damaged Areas Reference Point 11 DRAFT - 12/19/

41 Damaged Areas Problem Description 1 Concrete Jet Out Must confirm Jet out is in as-built; SE wall 2 Crack 2.5" wide crack at 1174' from reference point 3 Exposed Joint Runs 5' below surface at 1153' from reference point 4 Concrete Fender Concrete fender laying on the ground; where it came from not found 5 Crack 3 crack 2' from surface at 747' from reference point 6 Crack 2 wide at 735' from reference point 7 Exposed Joint Waterline to seafloor at 710' from reference point 8 Concrete Wearing Concrete is broken off in areas on NW wall of wharf 9-11 Broken Fenders Fenders are hanging and broken off DRAFT - 12/19/2011 *Note: Once exposed joints were found in several locations it was noted as a problem area in general and not marked as damaged area

42 Crack #2 Exposed Joint #3 DRAFT - 12/19/2011 Concrete Fender #4 Crack #6

43 Concrete Wearing #8 Concrete Wearing #8 Broken Fenders #9 Broken Fenders #9 DRAFT - 12/19/2011

44 Typical exposed joints along concrete seams

45 The student led Level I and II inspection of the City Pier revealed that the structure was in overall good condition. Further investigation is recommended on areas previously noted to determine extent of damage. Conclusion DRAFT - 12/19/2011 Level III or destructive testing is recommended to ensure structural concrete is within design parameters.

46 Panama City Marina Marina Bulkhead Assessment APPENDIX C Opinion of Probable Costs October 3, 2011 DRAFT - 12/19/2011

47 Panama City Marina Marina Bulkhead Assessment Table C-1. Preliminary Opinion of Probable Costs for Bulkhead Repair and Replacement Item Item Item Description Quantity Unit Unit Cost Total Sub-Total 1.0 Mobilization/Demobilization (1) 1 % 10.0% $188, General Conditions Item Sub-Total: $188, Demolition and Site Preparation 1 L.S. $125, $125, Item Sub-Total: $125, Replacement of Bulkhead, Cap, and Tie-Back System 3.1. Steel Sheetpile Bulkhead a) AZ-40 46' x 150' x LBF/FT². 135 T $1, $243, b) Epoxy Coating 25' x 150' x 2 7,500 S.F. $2.00 $15, c) Labor and equipment cost 150 L.F. $ $75, Item Sub-Total: $333, Reinforced Concrete Cap (150') a) Concrete 60"Wx24"D x 150'L 56 C.Y. $ $5, b) #6 Rebar 12 T $1, $21, c) #3 Rebar 2 T $1, $3, d) Labor and equipment cost 150 L.F. $ $18, Item Sub-Total: $48, Tie-Back System a) Con. Deadman 20"Wx6'D x 150'L 375 C.Y. $ $37, b) #5 Rebar 1 T $1, $1, c) 1-3/4" dia. 100ksi All-Thread Bar 1,000 L.F. $1.00 $1, d) 6"x6"x1" Steel Plate 45 EA. $26.00 $1, e) Hex Nut for 1-3/4" Bar 45 EA. $4.85 $ f) Bevel Washer for 1-3/4" Bar 45 EA. $28.00 $1, g) Coupling 24 EA. $26.00 $ h) Labor and equipment 150 L.F. $ $75, Item Sub-Total: $118, Repair of Existing Bulkhead 4.1. Concrete Bulkhead a) Bulkhead Repair with New Waler 600 L.F. $ $174, b) Bulkhead Repair 1,770 T $ $256, Item Sub-Total: $430, Reinforced Concrete Cap (2,545') a) Concrete 60"Wx24"D x 2,545'L 945 C.Y. $ $94, b) #6 Rebar 204 T $1, $367, c) #3 Rebar 34 T $1, $61, d) Labor and equipment cost 2,545 L.F. $ $305, Item Sub-Total: $828, L.S. = Lump Sum; C.Y. = Cubic Yard; L.F. = Linear Foot -15% $1,761,841 S.F. = Square Foot; FT = Foot; EA = Each; % = Percentage Total $2,072,754 W = Width; D = Depth; T = Ton; LBF = Pounds +15% $2,383,667 Table C-2. Preliminary Opinion of Probable Costs for Bulkhead Replacement October 3, 2011 DRAFT - 12/19/2011

48 Panama City Marina Marina Bulkhead Assessment Item Item Item Description Quantity Unit Unit Cost Total Sub-Total 1.0 Mobilization/Demobilization (1) 1 % 10.0% $1,402, General Conditions Item Sub-Total: $1,402, Demolition and Site Preparation 1 L.S. $250, $250, Replacement of Bulkhead, Cap, and Tie-Back System Item Sub-Total: $250, Steel Sheetpile Bulkhead a) AZ-40 46' x 1,394' x LBF/FT². 1,394 T $1, $2,509, b) AZ-25 37' x 4,241' x LBF/FT². 4,241 $1, $7,633, c) Epoxy Coating 7,500 S.F. $2.00 $470, d) Labor and equipment cost 5,635 L.F. $ $2,817, Item Sub-Total: $13,431, Reinforced Concrete Cap a) Concrete 60"Wx24"D x 5,635'L 2,087 C.Y. $ $208, b) #6 Rebar 25 T $1, $44, c) #3 Rebar 4 T $1, $7, d) Labor and equipment cost 5,635 L.F. $ $676, Item Sub-Total: $937, Tie-Back System a) Con. Deadman 20"Wx6'D x 5,375'L 1,991 C.Y. $ $199, b) #5 Rebar 29 T $1, $53, c) 1-3/4" dia. 100ksi All-Thread Bar 35,652 L.F. $1.00 $35, d) 6"x6"x1" Steel Plate 1,618 EA. $26.00 $42, e) Hex Nut for 1-3/4" Bar 1,618 EA. $4.85 $7, f) Bevel Washer for 1-3/4" Bar 1,618 EA. $28.00 $45, g) Coupling 809 EA. $26.00 $21, h) Labor and equipment 5,375 L.F. $ $2,687, Item Sub-Total: $3,091, L.S. = Lump Sum; C.Y. = Cubic Yard; L.F. = Linear Foot -15% $16,558,591 S.F. = Square Foot; FT = Foot; EA = Each; % = Percentage Total $19,480,695 W = Width; D = Depth; T = Ton; LBF = Pounds +15% $22,402,800 Notes: (1) Cost based on 10% of all direct construction costs (Item 1.0) (2) This Preliminary Opinion of Probable Cost is based on the results of the field investigations, and it is for budget purposes only. These estimates may be refined during value engineering and final design. (3) This Preliminary Opinion of Probable Cost does not include associated upland features not listed herein (i.e.. access roadways, parking, upland utility infrastructure, lock boxes, etc.) (4) The estimated materials and unit costs represent MRD Associates, Inc. (MRD) best judgment as a professional design firm familiar with the type of proposed construction. MRD has no control over the availability or cost of labor, equipment or materials, market conditions, or the Contractor s methods of pricing. Accordingly, MRD makes no warranty, express or implied, that the actual bids or negotiated prices will not vary from this Preliminary Opinion of Probable Costs. October 3, 2011 DRAFT - 12/19/2011