2006/09/20 Council Agenda Packet

"EXHIBIT A" 4 SCOPE OF WORK GEOTECHNICAL AND PIPELINE ENGINEERING 36TH STREET SEWER PROTECTION PROJECT SOUTH END INTERCEPTOR NORTH SEGMENT PROTECTION- PREDESIGN For City of Everett Department of Public Works July 31,2006 INTRODUCTION The City of Everett Department of Public Works requested that URS Corporation of Seattle to complete a pre-design evaluation of alternatives to protect an existing sewer pipeline (South.End Interceptor) from a proposed Burlington Northern Santa Fe(BNSF)rail crossing.The request was made by Mr_ Souheil Nasr, P.E. of the City during a meeting with Mr. Cecil Urlich, P.E. of URS on May 16, 2006. Following the meeting, URS reviewed a site plan the planned crossing area, a profile of the 36-inch pipeline,and the BNSF utility accommodation policy provided by the City. PROJECT BACKGROUND URS understands that the proposed rail road crossing is about 600 feet south of 36th Street. The pipeline is 36-inch diameter, Class 150,Concrete Cylinder Pipe(CCP)that was installed in 1992. The pipe is shown about 5 feet below the ground surface in the design drawings prepared in 1990. The pipeline crossing design must comply with rail design guidelines, AREMA Manual for Railway Engineering, and all applicable federal and state design codes. URS will perform a pre-design evaluation of the crossing design options to keep the pipeline along its current alignment. URS will evaluate the feasibility and cost of strengthening approaches to safely resist anticipated earth and live rail loading at the crossing while maintaining the existing pipeline alignment.The following strengthening approaches will be considered: o Bridge (Option 1): Protect the pipeline at the crossing using a bridge structure above the pipeline to safely transfer the rail road loading below the invert of the pipeline. o Case (Option 2): Protect the pipeline at the crossing by using oversized protective sleeves or casing installed around the pipe to resist the earth and live(rail road) loading. The City furnished geotechnical data from a nearby WSDOT HOV project site to the west for use in the pre-design evaluation. SCOPE On the basis of the reviews of the data furnished by the City and the May 16 meeting, URS developed the following scope of pre-design tasks to protect the south end interceptor pipeline: • Task 50201 — Site Reconnaissance and Data Collection • Task 50202—Crossing Pre-Design • Task 50203 —Cost Estimate • Task 50204—Review Meeting • Task 50205—Reporting • Task 50206— Undefined Work 18 URS Page 1 of 3 S:'•SNasr'36th St Sewer Protection 36th St Sewer Protection Scope July3 t Revised SNN.doc