Subsurface system aids in Pennsylvania redevelopment project
Located in Horsham Township, Pennsylvania, is the Horsham Business Park District. The district allows for mixed-use development via a zoning overlay. This overlay recently allowed for a redevelopment project at 200 Witmer Road. The project entailed the removal of a commercial office building centered around a new 256-unit residential complex and a 400-space parking lot. As a redevelopment project, the site’s need to meet current storm water management regulations presented the challenge of maximizing development space while incorporating new facilities.
To meet the new regulations, the design incorporated best management practices (BMPs). These BMPs included some pervious pavement parking stalls. Intermixed rain gardens provided further storm water treatment. Finally, a subsurface storm water storage system provided rate control. For the subsurface system, the land development engineer specified Brentwood Industries’ StormTank Module.
During the bidding phase of the project, the resulting design was over cost. The initial specification was for the Module 25 Series. As with most over cost projects, the question of whether to pursue other manufacturers arose. Instead, Brentwood offered a new alternative product. Released in early 2020, the Module 20 Series became an instant solution to reduce project costs.
Brentwood has a history of creating multi-industry products. This includes the Module 25 Series, which features a fully-factored HS-25 load rating. This load rating exceeded the strength required for many everyday applications. With the Module 20 Series, Brentwood leveraged their plastics expertise to deliver a second solution designed to help project professionals lower costs while still meeting site-specific requirements.
The Module 20 Series has a fully-factored HS-20 load support. Compared to the original StormTank Module 25 Series, the new Module 20 Series optimizes the layout of its structural members, reaping material cost savings around 15%. It also features quicker assembly and installation times. The time reduction comes from two areas: the roughly 30% larger footprint per unit and the relocation of support columns to the perimeter of the product.
The StormTank Module 20 Series was installed, providing a total storage volume of 69,770.66 cubic feet. This substitution provided the developer with the savings in material and labor needed to complete the redevelopment project. The engineer supported the use of a HS-20 product in the parking lot, and the construction team appreciated the reduced installation costs and time.