Brine Line Project – Harmony Grove to Broadway

WHB Engineers was selected to provide full construction management and inspection services for the City of Escondido’s $5,587,420 Gravity Sewer/Brine disposal pipeline.

The 15-inch diameter-PVC and 16-inch HDPE pipeline, will convey Brine produced from the Recycled Member Plant to a connection upstream of the City’s HARRF treatment facility. The project will construct 12,200 lineal feet (2.3 miles) of pipeline using a combination of open trench and trenchless construction including jack and bore and microtunneling. 

WHB Engineers is overseeing the projects State Water Resources Board, State Revolving Fund Loan construction requirements and environmental mitigation measures. WHB Engineers is also overseeing and enforcing the compliance with all permits, including the Caltrans Encroachment Permit and the NCTD Right of-Entry Permit. 

WHB Engineers is proactively addressing many construction challenges with the contractor CCL Contracting including four trenchless tunnel sections along the alignment. The alignment begins at the Harmony Grove crossing of the Escondido Creek channel, and continues east to the intersection of Broadway and Woodward generally following along the Escondido Creek and includes: 

• A 180 foot jack and bore section under Auto Parkway near the Kia Dealership and Auto Park Wash. 
• 340-foot trenchless tunnel through the Civic Center Plaza Shopping Center parking lot. 
• Micro-Tunnel section under the North County Transit District (NCTD) railroad tracks. 
• 100 foot jack and bore section under Center City Parkway. 
• Open Trench across Escondido Creek Near the NCTD facility.  
    

The alignment will be open trenched requiring dewatering across the Escondido Creek with siphons on either end. Pipeline will cross the Reidy Creek channel using open cut methods, and backfilled with CLSM. Siphons will be installed on either side of the creek crossing.