NORTH BAY PUMP STATION FOR
THE LAKE ARROWHEAD COMMUNITY SERVICES DISTRICT
IEC was selected by the Lake Arrowhead Community Services District to provide preliminary design, final design, and construction phase services for the North Bay Pump Station. The existing North Bay Pump Station pumped raw water from Lake Arrowhead to the Bernina Water Treatment plant. The facility is comprised of two sets of pumps consisting of the off-shore Intake Pumps and the on-shore Booster Pumps. The off shore pumps consist of three (3) vertical turbine constant speed well pumps and are located about 600 feet off-shore at a depth of about 60 feet. The pumps are suspended vertically by a battery of floats and pump into the suction of the Booster Pumps. The Booster Pumps consists of three (3) constant speed well pumps that are installed horizontally in a below grade structure whose top is just above ground level. These pumps experienced excessive bearing wear which required frequent replacement at considerable expense.
IEC developed alternatives to upgrade the Booster Pump Station including using variable frequency drives for the new pumps. The upgraded Booster Pump Station alternatives would utilize submersible lake pumps that pumped to a new onshore wet well from which point new vertical turbine pumps would convey water up to the Bernina plant. A detailed preliminary design report, including approximately 30% level drawings and detailed cost estimates, was prepared, followed by final design plans, specifications, and cost opinions.
KEY PROJECT COMPONENTS &
• Developed alternatives for new pumping configurations
• Evaluated alternative pump types and configurations
• Developed preliminary/final drawings for new pump station considering the need to keep all new facilities within the footprint of the existing facilities
• Community coordination and acceptance