The Aqua Chinon Creek Corridor (ACCC) encompasses an approximately 73-acre stretch of land bounded by Irvine Boulevard to the north and the Great Park Neighborhoods to the east, at the foothills of the Santa Ana Mountains.
A portion of the ACCC was daylighted by removing an underground culvert to create a riparian open-space corridor and mitigation area. ENGEO developed a water-balance study for the proposed ACCC. The purpose of the analysis was to manage the water resources for the proposed ACCC and to comply with the requirements of the United States Army Corps of Engineers (USACE) and the California Department of Fish and Wildlife (CDFW). The analysis identified surface and groundwater flow volumes that could be expected in the ACCC after the Heritage Fields Project was completed from upstream and development runoff. The flow volumes were used to develop an estimate of available water to sustain the various vegetation communities proposed for the channel and adjacent terraces as part of the mitigation area design.
ENGEO prepared Water Quality Management Plans (WQMPs) for the Heritage Fields Great Park Neighborhoods Project to treat urban runoff prior to discharge into the Greater San Diego Creek watershed. Furthermore, ENGEO designed the WQMP for the Orange County Great Park. As part of these plans, ENGEO also integrated approximately 10 Natural Treatment System basins and 1 Regional Bioretention Area into the redevelopment project in consultation with the City of Irvine and the Irvine Ranch Water District. Additionally, ENGEO incorporated infiltration Best Management Practices (BMPs) in park and low-density areas. Finally, ENGEO authored technical reports to support CEQA documentation associated with the overall water quality strategy for the project.