Permits & Development - Encroachment(EP)/Driveway(DW) Permits - 2012_DRIVEWAY PERMITS_PS-12001501 thru PS12002000_ - PS-12-01914

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Phone 209-948-0333 Direct 209-444-3119 Cell 209-986-6207 mo Fax 20'1-948-0423 STOCKTON EAST WATER E-mail: jbejarano@sewd net DISTRICT 6767 East Main Street www.sewd net Stocktor, CA 9521S TO: SJC Public Works—Permitting Division Jacob Bejarano Post Of-ice Box 5157 From: Jacob Bejarano-Stockton East Water District Assistant Engineer I Stockton. CA 95205 cc: Date: 8/3/2012 Re: Driveway Approach Permit Stockton East Water District(SEWD)is planning on constructing a construction entrance approach approximately 650 feet east of the Stockton Diverting Canal. Attached is a driveway encroachment permit and per our conversation, below are the answers to your department's previous comments. Project Specifics: • Construction hours will be Monday—Friday lam to 4pm. • The number of trucks utilizing the temporary driveway approach will be approximately 20 trucks per day during various operations throughout the project • Trucks are not planned to exit the driveway onto the eastbound lane. • The driveway will be removed and drainage swale reconstructed at the end of the project which is estimated at approximately 14 months of commencement of construction. Traffic Analysis: Using the above stated 20 trucks per day over an expected 6 hour delivery window, it is estimated that 3-4 trucks will utilize the driveway approach per hour. The analysis looked at queuing 1 to 8 trucks, turning left across Main Street,to determine the shortest sighting distance. Sighting distance is plotted on the Main Street profile with 4 trucks queued on the east bound lane(critical condition)and compared to the required Stopping Sight Distance of a vehicle traveling 55 mph,on a downgrade of -11.5%with a coefficient of friction of 0.35(wet conditions). It should be noted that a vehicle will actually travel upgrade through to a 0%grade for the most part of the stopping distance reducing the amount of clear roadway required to come to a full stop, however a conservative approach was taken which the analysis uses a downgrade of-11.5%throughout the entire stopping distance. A summary of the results is shown below. Table 1. Sighting Distance vs. ruck Queuing #of Trucks Queued 1 2 3 4 5 6 7 8 Line of Sight(ft.) 956 843 751 696 708- 723 759 1728 Required Stopping Sight Distance 631 ft. Source:Civil Engineers Reference Manual Eqn.78.43b The limiting sight distance(696 ft.)occurs when 4 trucks are queued at the driveway. Under this condign the sight distance is greater than the required Stopping Sight Distance by 65 feet. Based on the analysis,there is enough distance between the bridge and construction entrance to provide for safe stopping in wet weather conditions while trucks are queued. However,this is the worst t case scenario which when trucks are actively using the construction entrance,there will be some form Lffc control to warn oncoming traffic prior to arriving at the sighting distance. 1 -