THE SAN ELIJO LAGOON DOUBLE TRACK AND BRIDGE REPLACEMENT PROJECT John P. Eschenbach Sr. Project Manager Jacobs Engineering, Inc. 401 B Street, Suite 1560 San Diego, CA 92101 (619) 321-0009
[email protected] Irfan Kalhoro, PE Construction Manager AECOM 999 W. Town & Country Orange, CA 92868
[email protected] NUMBER OF WORDS: 2,966 ABSTRACT The San Elijo Lagoon Double Track and Bridge Replacement Project (SELDT) is located in Encinitas, CA between MP 238.0, CP Swami and MP 242.2, CP Valley on the North County Transit District (NCTD) railroad and is a part of the Los Angeles to San Diego rail corridor (LOSSAN). The LOSSAN corridor is the second busiest rail corridor within the Amtrak system. NCTD operates Coaster commuter trains and hosts Amtrak’s Intercity Pacific Surfliner trains, as well as BNSF freight operations. The SELDT project adds 1.5 miles of class 5 second mainline track on the LOSSAN rail corridor between the cities of Encinitas and Solana Beach. The new track extends between Cardiff-by-the Sea (CP Cardiff) and the southern border of the San Elijo Lagoon, resulting in 4.2 miles of continuous double track. The existing single track timber bridge, built in 1945, was replaced with a new double track concrete bridge. The new concrete bridge is an 8-span precast pre-stressed box girder bridge supported on concrete pile caps. The bridge foundation consists of cast-in-steel shell (CISS) piles that reach up to 110’ deep within the lagoon channel. The construction of the foundation utilized a pile driving analyzer (PDA) to measure the nominal resistance in real time during the pile driving operation.