HomeMy WebLinkAboutElizabeth Field Airport - Storm Damage Assessment Rept_Dec 2012 - Exhibit D1
December 20, 2012
Gordon Murphy
Fishers Island Ferry District
P.O. Box H
Fisher's Island, NY 06390
Re: Elizabeth Field Airport
Town of Southold, New York
Fishers Island, New York
Storm Damage Assessment
C&S File No.: 211
I.O
VERVIEW
Representatives of C&S Engineers, Inc. visited Elizabeth Airfield on 4 December 2012 to assess the
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conditions of the airfield as a result of Hurricane Sandy, which struck the Island on October 29. Conditions
reported during the event by local residents include sea swells of over 8ft, with the entire airfield
inundated with rain and sea water. Immediately after the storm surge had diminished, the airfield
pavements were observed to have upwards of 4in of standing water. The objective of this assessment was
to identify the extent of the damage, prepare a summary of repair recommendations, and furnish project
cost estimates to address the repairs. A summary of the findings is contained herein.
II.AP
IRFIELD AVEMENT
Runway 12-30
This Runway is currently open, but is closed to nighttime operations because upwards of 30% of the edge
lights are out of service. The approach category has been downgraded to visual only as the PAPIs and REILs
have been taken out of service. See Section III for discussion on the NAVAIDs.
Sand, cobbles, and other debris that had washed up onto the runway ends during the storm has since been
cleared and stockpiled near the limits of runway pavement overrun. The debris at the R/W 12 end is
approximately 6ft in height, for a width of 30ft, and extends the full width of the runway and at least 50 ft
beyond both edges of pavement. At the R/W 30 end, the debris varies in height from 2ft at the north end
to 6ft at the south end; 30ft in width, total length of approximately 800ft. A portion of the debris along the
southern side includes heavy stone from the seawall berm that has been compromised. Because the
material currently resides on a portion of the pavement overrun area and therefore violates the designated
Runway Safety Area (RSA) as well as the Runway Object Free Area (ROFA), the material should be removed
for safety and FAA compliance purposes. The total quantity of material that has been displaced at the R/W
12 and 30 ends is approximately 4,000 CY. At $30/CY, an estimated cost to remove/relocate the material is
$120,000.
Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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Runway 12 End - Looking North 1
Runway 30 End - Boulder Seawall & Debris
Runway 7-25
Sand, cobbles, and other debris has washed up at the R/W 7 end, upwards of 100ft onto the runway
pavement. Because of the amount of debris, estimated at 7,000 CY, has compromised the available runway
length, and a significant number of runway edge lights are out of service or have been exposed to sea
water, the runway has been closed at the direction of the FIFD.
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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Similar to the R/W 30 end, a portion of the debris along the southern side includes heavy stone from the
seawall berm that has been compromised. An estimated cost to remove/relocate the debris, at $30/CY, is
$210,000. There was no damage noted at the R/W 25 end.
Runway 7 End Extent of Debris Wash-up (6ft Max Depth)
Other Pavement Areas
No notable damage was observed to the shoulder pavement of either runway. The tie down apron adjacent
to the electric vault building had some random vegetative debris, but otherwise experienced no damage.
III.NAVAIDS
Runway Edge Lights
As discussed earlier, a significant number of edge lights were damaged or are out of service. In addition,
several of the runway threshold lights were damaged; three each at the R/W 12 and R/W 30 ends, three at
the R/W 25 end, all six have been buried at the R/W 7 end. Although the edge lights that remain could
remain functional, sea water has entered each of the junction cans. The corrosive effects of the salt water
will affect the integrity and performance of the light transformers and connector cables, either immediately
or eventually, resulting in inoperable light systems and overall unsafe runway conditions. An estimated
cost to remove and replace all runway edge lights is $45,000.
Guidance Signs
Four guidance signs were separated from their bases as a result of the storm. Since they were found lying
down, they were likely inundated with rain and seawater. The four remaining guidance signs were
observed to be intact, though it is likely they were inundated with floodwaters. It is recommended that all
guidance signs be replaced in kind. An estimated cost to remove and replace all eight signs is $32,000.
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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Runway 7-25 Guidance Sign Panel Runway 7-25 Sign Base
Runway End Identifier Lights (REIL)
The south REIL at the R/W 30 end is buried in up to 6ft of sediment and debris, and both REILs at the R/W 7
end are buried in as much as 2ft of the same. The visible portion of the light fixture for the R/W 7 southern-
most REIL was damaged. Given the damage to the units, and the probable exposure to floodwaters, it is
recommended that all REIL units be replaced in kind. An estimated cost to remove and replace the REIL
systems is $60,000.
Runway 7 REIL (buried)
Precision Approach Path Indicator (PAPI) Systems
The Master Unit for the R/W 30 PAPI was toppled from its supports and would appear to have been
exposed to rain and sea water. Although the remaining PAPI units were intact, it is likely they were exposed
to salt water. It was observed within the main distribution panel of the vault that the circuit breakers for
the PAPIs and REILS had tripped, indicating rain or seawater had entered the power supply control cabinet
and or the light units. It is recommended that all PAPI units be replaced in kind. An estimated cost to
remove and replace the PAPI systems is $80,000.
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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Runway 25 PAPI Condensation Developed on Lens
Runway 25 PAPI Control Unit Evidence of Corrosion
Runway 30 PAPI Control Unit Knocked Over Runway 30 PAPI Floodwater Draining from Unit
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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Obstruction Lights
Three obstruction lights were affected as a result of the storm; two at the R/W 30 end were broken at the
base of the foundation, and one light at the end of the R/W 7 pavement is buried. The light foundation
structures remain intact, however the cable and conduit adjacent to the foundations has been damaged
beyond repair. It is recommended that the damaged obstruction lights be replaced in-kind, along with
replacement of the portion of damaged power cable and conduit; estimated cost $14,500.
Runway 30 End Double Obstruction Light No. 2 Runway 30 End Double Obstruction Light No. 3
Wind Cone
It was reported that the wind sock had apparently become detached and went missing, however it was
retrieved and the wind cone is in working condition.
With the exception of the wind cone and R/W 12-30 edge lights, the FIFD has taken all NAVAIDS out of
service. Although a NOTAM has been issued indicating the airfield is closed during nighttime, the remaining
operable edge lights should remain in service in the event that planes need to land on the runway.
It should be noted that in the cost estimates for the respective NAVAIDS, it was assumed that the existing
wiring could be re-used. Wiring that has been exposed to floodwaters may or may not be required to be
replaced, depending on the type of wire or cable, and whether other contaminants are found within the
floodwaters. In the instance of airport lighting cable, it is not uncommon to find airfield electrical
components that operate as intended where the cable has been routinely exposed to groundwater. If it is
determined that the integrity of the cables is questionable, an additional cost to install new cable would
need to be considered.
IV.S
EAWALLS
Seawalls comprised mostly of heavy boulders were constructed at the R/W 7 and R/W 30 ends to protect
against coastal erosion. The R/W 30 end appeared to generally remain intact, and was subsequently buried
with sand, cobbles, and other debris during the runway clearing operation. The original R/W 30 seawall
measures approximately 275ft in length, with an elevation upwards of 10ft above MSL. It is suggested that
the length of the wall is extended at least 150ft from the eastern end, at an elevation of no more than 6ft
above MSL, using similarly sized large boulders in-filled with smaller cobbles to prevent sand and other
debris from penetrating through and onto the airfield pavement. The heavy boulders would be keyed into
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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the native materials to protect against undermining. The elevation at the top of the berm would need to be
verified so as to not introduce an obstruction and violate FAR Part 77 Approach Surfaces. The exact length
of wall addition also requires further investigation. As a means of planning and programming repairs, it is
estimated that at least 500 CY of heavy stone would be required to extend the wall at the R/W 30 end.
Runway 30 End - Boulder Seawall & Debris
Runway 30 End - Boulder Seawall & Debris
The seawall at R/W 7 end did not fare well against the storm and as a result has compromised the integrity
of the means to protect this end against coastal erosion.
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Gordon Murphy
Elizabeth Field Airport
December 20, 2012
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enough or high enough to protect the storm surge from breaching the runway pavement. The large
boulders were undermined and relocated during the storm event. Several tons of debris has since covered
the Runway 7 end and overrun area. Similar to the R/W 30 end, the replacement seawall at the R/W 7 end
should be reconstructed using large heavy boulders, and keyed into the native subgrade material. The total
required length of the wall is estimated to be 300ft, with a maximum top elevation of 6ft above MSL to
avoid impacting the Part 77 Surfaces. The proposed dimensions would need to be verified as part of a
detailed analysis. To reconstruct the R/W 7 seawall, an approximate quantity of 600 CY of material would
be required. At an approximate unit cost of $100/CY, the total estimated cost to repair/reconstruct both
seawalls, using the unverified limits defined earlier, is $110,000.
Runway 7 End Remnants of Boulder Seawall & Debris
It should be noted that the current (2011) Airport Layout Plan (ALP) indicates future relocation and
modification to both R/W 7 and R/W 30 seawalls. The primary reason for the proposed actions was based
on the intent to increase the airport classification from A-1 (small planes exclusively) to A-1 & B-1 aircraft
for the entire airport, and also improve the approach category to allow for GPS-aided navigation (R/W 30
end only). Improving the aircraft classification requires a wider Runway Object Free Area, which would
require relocation/reconstruction of the seawalls. Improving the approach category requires displacing the
threshold to provide for a longer runway, also requiring modifications to the seawall. Justification and FAA
concurrence for changing the aircraft designation has not been completed at this time. In addition, a recent
inquiry into NYSDEC requirements for coastal repairs from the storm event indicated that there exists a
General Permit for shoreline reconstruction efforts applicable to coastal areas impacted by the Hurricane,
in effect through October 31, 2013. Based on the impending time limit to complete the work, and in the
interest of being able to open both runways and provide means of protection against severe coastal storm
events, it is advised that any improvements to the existing seawalls only account for the current airport
classification (A-1).
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Exhibit 1
OPINION OF PROJECT COST SUMMARY
ELIZABETH FIELD AIRPORT211
FISHERS ISLAND, TOWN OF SOUTHOLD
STORM DAMAGE REPAIR WORKDecember 20, 2012
revJanuary 17, 2013
UNIT
ITEMFAA
NOSPECQUANTITYUNITSPRICETOTAL
DESCRIPTION
1P-15211,000CY$30.00$330,000.00
UNCLASSIFIED EXCAVATION
4,000SF$0.20$800.00
2D-710STABILIZATION FABRIC
3D-7121,100CY$100.00$110,000.00
STONE SEAWALL BERM
9,000SY$2.00$18,000.00
4T-906BEACH GRASS
5L-1084,500LF$1.00$4,500.00
NO. 8 AWG, 600V, 1/C AIRPORT LIGHTING CABLE
1,500LF$8.00$12,000.00
6L-1102 IN DIA PVC CONDUIT
7L-1191EACH$750.00$750.00
SINGLE AIRPORT OBSTRUCTION LIGHT
2EACH$900.00$1,800.00
8L-119DOUBLE AIRPORT OBSTRUCTION LIGHT
9L-12550EACH$900.00$45,000.00
MEDIUM INTENSITY R/W LIGHTS, ON EXISTING BASE
8EACH$4,000.00$32,000.00
10L-125TAXIWAY GUIDANCE SIGN, 4 CHARACTERS
11L-1254EACH$20,000.00$80,000.00
PRECISION APPROACH PATH INDICATOR (PAPI) SYSTEM
24EACH$900.00$21,600.00
12L-125THRESHOLD LIGHTS ON EXISTING BASE
13L-1254EACH$15,000.00$60,000.00
RUNWAY END IDENTIFIER LIGHT (REIL) SYSTEM
40EACH$100.00$4,000.00
14L-125REMOVAL OF EXISTING R/W LIGHTS
15L-12540EACH$15.00$600.00
I.D. TAGS FOR LIGHT UNITS
1LS$5,000.00$5,000.00
16M-150PROJECT SURVEY & STAKEOUT
17M-2001LS$28,950.00$28,950.00
MOBILIZATION (4% MAXIMUM)
$755,000.00
TOTAL CONSTRUCTION COST
$76,000.00
ENGINEERING & ADMINISTRATION (10%+/-)
TOTAL ESTIMATED PROJECT COST$831,000.00