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Fountaingrove Environmental Impact Report - City of Santa Rosa ...

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3.13 TRAFFIC AND TRANSPORTATION<br />

Springs Road leads to Old Redwood Highway and to an interchange with U.S. 101. Only 15<br />

percent <strong>of</strong> Project traffic is projected to travel to or from north <strong>of</strong> the Project site on U.S. 101 and<br />

Old Redwood Highway combined (see Table 3.13-3). In addition, the routing using <strong>Fountaingrove</strong><br />

Parkway to U.S. 101 and Old Redwood Highway is more direct than a Thomas Lake Harris<br />

Drive-Cross Creek Road-Mark West Springs Road routing (Crane Transportation Group, 2006).<br />

Therefore, only negligible levels <strong>of</strong> Project traffic would use Mark West Springs Road, and no<br />

measurable impact to operating conditions on Mark West Springs Road would occur.<br />

Mitigation Measure 3.13-1: Add a traffic signal on Thomas Lake Harris Drive.<br />

A three-legged signal shallwill be installed at Thomas Lake Harris (West) and <strong>Fountaingrove</strong><br />

Parkway. This traffic signal would alleviate the need for a westbound right-turn deceleration lane<br />

and an eastbound left-turn acceleration lane on Thomas Lake Harris Drive. In addition to the<br />

traffic signal, there will be a need to increase the radius <strong>of</strong> the curb return on the northeast<br />

quadrant <strong>of</strong> the intersection to improve the flow <strong>of</strong> the westbound to northbound right turn. The<br />

traffic signal would be interconnected (timed) with the existing traffic signals at the intersection <strong>of</strong><br />

<strong>Fountaingrove</strong> Parkway and Round Barn Boulevard, as well as the intersection <strong>of</strong> <strong>Fountaingrove</strong><br />

Parkway and Altruria Drive. This would result in an improvement over the existing LOS.<br />

It is important to note that drivers using Thomas Lake Harris Drive also have the option <strong>of</strong> using<br />

the nearby Fir Ridge Drive intersection for signalized access to <strong>Fountaingrove</strong> Parkway.<br />

After Mitigation: Less than significant<br />

<strong>Impact</strong> 3.13-2: The Project would add traffic trips to U.S. 101, potentially resulting in a<br />

degradation <strong>of</strong> peak hour LOS below Sonoma County Congestion Management Authority LOS<br />

E.<br />

Analysis: Less than significant<br />

Based on the distribution patterns shown in Table 3.13-3, the Project would be expected to add<br />

traffic to U.S. 101 and its ramps, as shown in Table 3.13-6. The additional traffic is less than 0.2<br />

percent <strong>of</strong> the capacity <strong>of</strong> the six-lane segment <strong>of</strong> freeway in central <strong>Santa</strong> <strong>Rosa</strong> now under<br />

construction. This is a negligible impact and would not affect the LOS on U.S. 101.<br />

Mitigation: No mitigation required<br />

<strong>Impact</strong> 3.13-3: The Project could result in an increase in hazards due to a design feature (e.g.,<br />

sharp curves or dangerous intersections) or incompatible uses.<br />

Analysis: Less than significant<br />

The posted speed limit on Thomas Lake Harris Drive near the Project site is 25 miles per hour.<br />

Based on criteria from the American Association <strong>of</strong> State Highways and Transportation Officials<br />

(Crane Transportation Group, 2006), the minimum required sight distance is 155 feet, which is<br />

lower than <strong>Fountaingrove</strong> Lodge’s driveway design (which ranges from 285 feet to 480 feet) on<br />

Thomas Lake Harris Drive.<br />

3-164 BAO\082970001

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