LocationHollywood, St. Mary's County, Maryland
MarketWater Storage and Tanks
500,000-GALLON PEDESPHERE FOUNDATION, SITEWORK, WATER MAIN, ELECTRICAL & INSTRUMENTATION SYSTEMS.
Johnston Construction Company
- Johnston Construction Company served as Civil Subcontractor to Caldwell Tanks, Inc. for the civil, foundation, utility, electrical and instrumentation work supporting the new 500,000-gallon Hollywood elevated water storage tank and water station in St. Mary’s County, Maryland. The overall facility incorporated a new 400 GPM well, water-station equipment and connections to the existing distribution system.
- Performed project mobilization, erosion and sediment controls, construction staking, excavation, grading, underground utilities, site development and restoration associated with the Hollywood tower and water-station site.
- JCC constructed and coordinated the pile-supported foundation system required for the new elevated tank, with Hollywood foundation earthwork specifically designed around augered pressure-grouted piles in accordance with the project geotechnical recommendations.
- Incorporated augered piles recommended at approximately 16 inches in diameter, extending to a minimum tip elevation of +71 feet, with a design compression capacity of 150 kips per pile.
- Coordinated the required pile-installation plan, quality-control procedures and static pile load testing prior to installation of production piles. The project specifications required load testing in accordance with ASTM D1143 and Engineer approval before production pile installation.
Concrete Services Division
- Performed the forming, concrete placement, finishing and curing work required for the tank foundation in accordance with the project drawings, Caldwell tank-foundation requirements and applicable MetCom concrete specifications.
- CSD completed approximately 973.5 square feet of concrete formwork, including footing forms, slab-on-grade forms and the curved-wall forming system required for the tank foundation.
- Constructed approximately 604.8 square feet of curved-wall formwork, representing the largest single formwork component of CSD’s subcontract.
- Furnished and installed approximately 284.8 square feet of slab-on-grade formwork and approximately 84 square feet of footing formwork.
- Placed approximately 110.7 cubic yards of concrete across the footing, slab-on-grade and curved-wall portions of the foundation.