Leucadia Pump Station
Carlsbad, CA

The project consists of the expansion and renovation of the pump station.  The pump station is approximately 58’x32’x24’ deep, cast-in-place reinforced concrete below grade pump station with a one-story CMU building above. 

Our responsibilities included a study of the pump station.  The study was to determine whether to replace the existing engine generator, install a new access hatch in the wet well top slab and rehabilitate deteriorated portions of the wet well.  The study also included the addition of an overflow tank, a sewage grinder to the wet well, addition of an odor control system and evaluation of the bioxide storage inside the pump building. 

After the study was completed, we were asked to do the structural design for the expansion and renovation of the pump station.  The expansions and renovations included:

• A new emergency storage tank, approximately 70’ x 29’ by 23’ deep, with retaining walls. 
• A new concrete platform at a sewage grinder in the wet well.
• A new top slab over the valve vault adjacent to the west wall of the pump station.
• A new base slab for a jib crane located outside of the building. 
• Rehabilitation of the wet well access hatch at entry stairs. 
• New access hatch in wet well top slab above the sewage grinder and infilling opening at existing manhole. 
• New FRP stairs, landing, walkway and handrails in wet well.
• Support for roof mounted mechanical units. 

Other tasks included analysis of the pump station building to check adequacy of roof diaphragm and CMU wall anchorage to resist seismic loading; and design of retrofit details to upgrade roof diaphragm and CMU wall anchorage to comply with 1997 UBC seismic requirements if required.