IPG Photonics Corp, a world leader in fiber lasers, is headquartered in Oxford, MA. Their business headquarters required additional parking to support the expanding employee workforce. The existing site constraints included Riverfront Area, bordering vegetated wetlands and 100 Year Flood Plain. Eaglebrook designed a surface parking facility to accommodate IPG’s growing infrastructure needs. A stormwater mitigation system was required to meet the Massachusetts Stormwater Management Requirements and the town of Oxford Stormwater Bylaws. An underground stormwater infiltration system utilizing Contech Chambermaxx chambers was designed to provide mitigation for peak flows and volumes of runoff to simulate the existing condition runoff characteristics. Pretreatment measures were implemented to meet stormwater regulatory requirements and to extend the useful life of the underground infiltration system. Some of the pretreatment included deep sump catchbasins, hydrodynamic separators, isolator rows of chambers.