Housing Authority City of Los Angeles | 2025 Tar Pit Assessment at 2600 Wilshire

Owner: Housing Authority City of Los Angeles (HACLA)
Period: 2025

The objective of this project is to evaluate the recurring tar issue in the elevator pits and adjacent areas of the lowest parking level, and to develop a cost-effective maintenance strategy that minimizes the need for frequent environmental remediation. 

Kewo Engineering is evaluating the tar intrusion issue, analyze environmental conditions (tar, water, and any vapors), and provide a comprehensive report with findings, potential solutions, and recommendations for routine maintenance. Our scope of services includes: 

• Data Collection and Review  
  • Coordinate with HACLA to obtain relevant documents relevant to this project.  
  • Review documents to assess ongoing issues, past remediation activities.  
  • Conduct workgroup sessions with HACLA engineers and maintenance personnel to discuss historical tar management practices, operational constraints, and potential solution preferences.  
• Site Inspection and Tar, Water, and Ambient Indoor Air Sampling and Analysis  
  • Conduct site inspections of areas of interests (e.g., elevator pits, sump vaults, and ventilation ducts), as-needed.  
  • Collect and analyze tar, water, and air samples to evaluate contaminants (e.g., hydrocarbons, VOCs, metals).  
  • Use field instruments to screen for methane gas. Analysis will inform safety considerations and design recommendations.  
• Reporting, Recommendations, and Containment Alternatives  
  • Prepare a comprehensive engineering assessment report summarizing site findings, lab results, and feasible solutions.  
  • Include descriptions of proposed solutions and an evaluation of each alternative’s feasibility, operational impact, and cost estimates.  
  • Provide recommended alternatives with cost estimates, maintenance plans, and immediate safety recommendations if applicable.