April 10, 2015 Mr. Bobby Assil ETCO HOMES 9560 Wilshire Blvd., #2000 Beverly Hills, CA 90212

SUBJECT:

MARIPOSA APARTMENTS SIGHT DISTANCE EVALUATION

Dear Mr. Bobby Assil: This Sight Distance Evaluation for the Mariposa Apartments residential development (referred to as “Project”) located on the southeast corner of Lakeview Avenue and Mariposa Avenue in the City of Yorba Linda, provides a sight distance assessment at Lakeview Avenue/Mariposa Avenue/Project driveway intersection.

SIGHT DISTANCE EVALUATION A sight distance analysis has been performed for the Project access point on Lakeview Avenue based on the visibility limitations due to the horizontal and vertical curves along Lakeview Avenue, south of the proposed Project entry at intersection of Lakeview Avenue/Mariposa Avenue. The sight distance analysis has been utilized to determine whether acceptable stopping/intersection sight distances are provided based on the minimum distances defined by the County of Orange roadway standards. It should be noted that City of Yorba Linda uses the County’s sight distance criteria, which are consistent with the requirements outlined in the Caltrans Highway Design Manual (HDM).

SIGHT DISTANCE CRITERIA The County of Orange, OC Public Works Department (Standard Plan No. 1117) requires the assessment of stopping sight distance. As defined by the Caltrans HDM, sight distance is the continuous length of highway ahead visible to the driver. Stopping sight distance is the minimum sight distances provided at interchanges and at-grade intersections. At unsignalized intersections, intersection sight distance must provide a substantially clear line of sight between the driver of the vehicle waiting on the minor road (driveway) and the driver of an approaching vehicle. For the purposes of this analysis, a 7 ½ second criterion has been applied to the outside travel lanes in either direction to provide the most conservative sight distance. The 7 ½ second criterion allows waiting vehicles to either cross all lanes of through traffic by turning left or cross the near lanes by tuning right without requiring through traffic to radically alter their speed.

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Mr. Bobby Assil ETCO HOMES April 10, 2015 Page 2 of 3

COUNTY OF ORANGE SIGHT DISTANCE STANDARDS Project driveway on Lakeview Avenue has been assessed for stopping sight distance assuming the “object” in the road is another vehicle. Per Standard Plan No. 1117, intersection sight distance calculations assume a driver eye height of 3 ½ feet to the top of an object 4 ¼ feet above the pavement. In determining intersection sight distance, a set-back distance for the waiting vehicle on the minor road must be assumed. Set-back for the driver on the minor road shall be a minimum of 10 feet behind the edge of traveled way. Lakeview Avenue is designated as a Primary arterial. Standard Plan No. 1117 states that the minimum sight distance on a Primary is 610 feet for unsignalized intersections and 500 feet for signalized intersection. SIGHT DISTANCE ASSESSMENT AT LAKEVIEW AVENUE/MARIPOSA AVENUE/PROJECT DRIVEWAY There are no limited use areas identified in the northerly direction of the Project driveway due to the horizontal curvature of Lakeview Avenue. It is anticipated that the minimum 610 foot sight distance could be accommodated for vehicles traveling in the southbound direction towards Project driveway. The sight distance lines at Project driveway in the southerly direction are illustrated on Exhibit 1 for an unsignalized intersection. Per Standard Plan 1117, the limited use area is determined by the graphical method using appropriate distances given in the table. It shall be used for the purpose of prohibiting or clearing obstructions in order to maintain adequate sight distance at intersections. Adequate visibility for vehicular and pedestrian traffic can be provided at the intersection of Project driveway and Lakeview Avenue by limiting sight obstructions within the limited use area. Any landscaping within the limited use area shall be of the type that will grow no higher than 12 inches above the ground and shall be maintained at a maximum height of 12 inches above the ground. Installation of a traffic signal at the Lakeview Avenue/Mariposa Avenue/Project driveway intersection is recommended in The Mariposa Apartments Project Focused Traffic Analysis (Urban Crossroads Inc., February 25, 2014). As such, sight distance lines and limited use area for a signalized intersection is shown on Exhibit 2. Due to the roadway’s vertical curve, a profile of the sight lines for Project driveway on Lakeview Avenue has been provided on Exhibit 3. Exhibit 3 identifies the line of sight for the driver’s eye height of 3 ½ feet (waiting vehicle) represented by a red line, an object height of 4 ¼ feet (approaching vehicle) represented by a green line, and the vertical profile of the roadway is represented by the black line. As shown on Exhibit 3, it is anticipated that a vehicle waiting to exit Project driveway on Lakeview Avenue can see an approaching vehicle at a height of 4 ¼ feet from beyond the minimum sight distance required under both unsignalized and signalized conditions. Since the green line

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Mr. Bobby Assil ETCO HOMES April 10, 2015 Page 3 of 3 (representing the approaching vehicle) clears the vertical alignment of the roadway to the south of Project driveway, it is therefore visible to the waiting vehicle at the Project driveway. If you have any questions, please contact me directly at (949) 660-1994 x 205. Respectfully submitted, URBAN CROSSROADS, INC.

Pranesh Tarikere, P.E. Senior Engineer

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