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Cal October 24, 2013 B F Mr. Mike Tassano Project Manager City of Pleasanton ENGINEERS Engineering Department SURVEYORS 1500 Warburton Avenue PLANNERS Pleasanton,CA 94566 SUBJECT: Bernal Avenue @ I-680 Interchange Improvement Project Amendment No. 3 -Additional Scope of Services Dear Mr. Tassano: BKF Engineers(BKF)has cooperatively worked with the City of Pleasanton(City) in obtaining a Caltrans encroachment permit for the construction of the Bernal Avenue at I-680 Interchange Improvement Project (Project). Per Caltrans direction, the issued Caltrans encroachment permit is limited to the roadway elements of the Project in anticipation of a rider to the encroachment permit for the landscaping and gateway elements. Additionally, as part of the roadway encroachment permit, Caltrans has requested that the archaeological test program be conducted prior to the start of any construction related to the Project. In initial discussions with the City, it is preferred that the archaeological test program be performed prior to circulating the Project for bid and has asked for a proposal from BKF and its subconsultant, Basin Research Associates (BASIN) to perform the test program. Based on this request, the following is proposed for the archaeological test program for the work identified in the Caltrans encroachment permit: Archaeological Test Program An archaeological test program is proposed for the roadway, landscape, and gateway features construction. A review of the available archaeological site data suggests that prehistoric cultural deposits could be present within the Project footprint under varying depths of engineered fill ranging from 30 cm to 180 cm (1.0-6.0 feet) below the present grade. The following describes the mechanically assisted test program required in accordance with the approved Historic Resources Compliance Report dated April 2013. The archaeological testing program shall consist of six backhoe test units (BTU) and three auger bores (ATU) in compliance with the Historic Resources Compliance Report dated April 2013. The BTUs and ATUs will be placed in the areas to be potentially affected by the Project subsurface construction to determine if prehistoric archaeological deposits could be adversely affected. Unit locations will be adjusted to avoid impacts to the underground infrastructure based on USA and other utility location information. This test program will require an encroachment permit from Caltrans to perform the test program prior to construction. BKF will prepare the encroachment permit application for the work. It is anticipated that Caltrans will charge a fee for the permit that will not exceed $1,000. If the fee exceeds this estimate, BKF will notify the City and request an amendment for the amount over the estimate.