Century High School

  • Category:
  • Client: Alhambra Unified School District
  • Location: Alhambra, CA

Alhambra Unified School District (AUSD) demolished existing onsite buildings at the AUSD Transportation Facility in Alhambra in order to construct the New Century High School with a capacity for 230 students and 24 faculty and staff members. To assess potential releases of contaminants at the former Transportation Facility, UltraSystems completed a Preliminary Endangerment Assessment (PEA) to include soil matrix sampling near fuel underground storage tanks (USTs), a waste oil UST, clarifier, bus-wash area, maintenance area, chemical storage area, and other sources. Based on the findings, a Removal Action Workplan (RAW) was prepared and implemented to address contamination associated with former fuel Underground Storage Tanks (USTs), a clarifier, and chemical storage area. UltraSystems prepared a UST Closure Report for the Los Angeles County Fire Department (LACFD) and a Removal Action Completion Report (RACR) for the Department of Toxic Substances Control (DTSC) to obtain “closure.” A Human Health Risk Assessment (HRA), including a vapor intrusion analyses, was completed to demonstrate that residual contaminants were protective of school children and faculty health. Subsequently, UltraSystems prepared an Initial Study and Mitigated Negative Declaration (IS/MND) to assess potential impacts to biological resources, cultural resources, geology and soils, hydrology, water quality, and noise for the construction and operation of the New Century High School. Mitigation measures proposed by UltraSystems were adopted by AUSD as part the Mitigation and Monitoring Program (MMRP) and Final IS/MND to reduce potential environmental impacts to less than significant levels.