Draft EA - San Diego International Airport

SAN DIEGO INTERNATIONAL AIRPORT – PROPOSED RUNWAY 9 DISPLACED THRESHOLD
4.6.2 PROPOSED ACTION
The Proposed Action would result in the relocation of the displaced threshold, which entails relocating
pavement markings, relocating the glide slope antenna, and relocating elements of the MALSR. All of these
actions would occur on the airfield on existing paved surfaces or at existing lighting stations; no new
impervious surface would be created and no new lighting stations would be installed.
Under the Proposed Action there would be no change to the impervious surface area and, therefore, no
potential for additional impact to aquifer recharge. The Proposed Action would not involve grading;
therefore, there is no potential for downstream erosion or sedimentation or modified drainage patterns.
There is no earthwork associated with the Proposed Action and accordingly no potential for pollution and
contamination impacts nor need for sediment and erosion control. The Proposed Action would not impact
any of the SDIA SWMP provisions. The Proposed Action would close and remove two MALSR light stations
located on ground to the west of the Navy Boat Channel. The existing cable connecting the MALSR light
station 21+00 in the water to the MALSR light station 23+00 on ground would be abandoned in place. The
existing marine power cable connecting the existing MALSR light stations 21+00 and 23+00 would be left in
place to avoid any adverse impacts to bottom sediments, marine communities, or eel grass. 27
4.6.3 MITIGATION MEASURES
If activities that will disturb the Navy Boat Channel floor are necessary, the FAA will specify the use of turbidity
curtains to deflect and contain sediment within a limited area around the construction site and provide
retention time for particles to fall out of suspension.
4.7 Wetlands
Executive Order 11990 requires federal agencies to minimize the destruction, loss, or degradation of wetlands
resulting from their actions. Section 404 of the CWA, as amended, requires regulation of discharges or fill
matter into waters of the U.S. The USACE has primary responsibility for implementing, permitting and
enforcing the provisions of Section 404. Consultation was initiated with the USACE regarding the proposed
project on November 30, 2012.
Wetlands are defined as those areas that are inundated or saturated by surface or groundwater at a frequency
and duration sufficient to support, and that under normal circumstances do support, a prevalence of
27
As part of Section 7 consultation undertaken as part of the Medium Intensity Approach Lighting System with Runway Alignment Indicator
Lights, San Diego International Airport, Final Environmental Assessment, (June 2012), the National Marine Fisheries Service noted that
damage to eelgrass and/or essential fish habitat may occur due to disturbance of the seafloor substrate from the removal/replacement of
cables. To minimize potential disturbance to the seafloor substrate, the FAA agreed to abandon cables in place, to the extent possible.
Environmental Consequences
[4-20]
Draft EA