I-10 Twin Peaks Traffic Interchange, Environmental Assessment

Affected Environment and Environmental Impacts October 2005
of these homes may be protected by a wall between Bald Eagle Drive and Manatee
Drive that would be 773 feet in length and 5.5 feet in height. The approximate
overall cost for the wall would be $85,030. The wall would protect 6 receivers at a
cost per benefited receiver of $14,172; therefore, this wall would be constructed.
Receiver LVR13 – This receiver is located in the southeast corner of Linda Vista
Boulevard and Manatee Drive and is predicted to experience traffic noise levels of
64 dBA. According to STAMINA, the residence immediately south of LVR13
(LVR13A) does not approach the NAC. To mitigate noise, a wall that begins 51
feet south of Linda Vista Boulevard, moves north to Linda Vista Boulevard and
then turns to the east for 101 feet was examined. The 51-foot length of wall would
begin at 9.5 feet in height and increase to 12.5 feet in height as it reaches Linda
Vista Boulevard. The entire 101-foot length would be 12.5 feet in height. The
approximate overall cost for this wall would be $36,480 and only receiver LVR13
would receive a 5 dBA benefit; therefore, this wall would not be constructed.
Receivers LVR14 – LVR15 – These receivers, from the drainage channel east of
LVR13 to the southwest corner of Linda Vista Boulevard and Waterbuck Drive,
are predicted to both experience traffic noise levels of 64 dBA. In addition to
LVR14 and LVR15, an additional 3 residences experience noise levels in excess of
the NAC in this area. All of these homes may be protected by a wall between the
drainage channel and Waterbuck Drive that would be 463 feet in length which
connects to the existing walls on the both ends to the south. The wall would be 10
feet in height and would be constructed at an approximate cost of $92,600. The
wall would protect 5 receivers at a cost per benefited receiver of $18,520;
therefore, this wall would be constructed.
Receiver LVR16 – This receiver is located on the southeast corner of Linda Vista
Boulevard and Waterbuck Drive and is predicted to experience traffic noise levels
of 64 dBA. According to STAMINA, the residence immediately south of LVR16
(LVR16A) does not approach the NAC. A 12.5-foot wall that begins 60 feet south
of Linda Vista Boulevard, moves north to Linda Vista Boulevard, turns to the east
for 150 feet, then turns south for an additional 13 feet to tie to the existing fence
along the drainage channel to the east of LVR16 would be required. The
approximate cost for this wall would be $55,750 and only LVR16 would be
benefited; therefore, this wall this wall would not be constructed.
Receiver LVR21 – This receiver is located on the Arthur Pack golf course west of
Mountain View High School on the south side of Linda Vista Boulevard. Noise
levels are predicted to reach 67 dBA in this area because of the proximity of the
golf course to the roadway. However, mitigation was not considered for this
receiver because golfers are exposed to traffic noise for relatively short periods of
time on the course and walls would impose a visual restriction on views to the
north and east from the golf course.
Interstate 10 Traffic Interchange at
Twin Peaks/Linda Vista
4-61
Project No.: NH-010-D (AIW)
TRACS No.: 10 PM 236 H5838 01D