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a Environmental Consulting Services Approach for the City of Santa Ana General TRC provides on -site abatement construction administration and project monitoring services to ensure abatement contractor compliance with pertinent state and federal regulations. l Lead Survev a TRC provides surveys for the presence of lead in construction materials. This includes lead -based paint (LBP) and other lead- containing building materials. Department of Housing and Urban Development (HUD) and Los Angeles County Guidelines are used by California Department of Health Services (DHS) Lead Certified individuals to complete the survey. The XRF instrument indicates the lead concentrations in the painted surfaces in a non - destructive manner. The XRF model utilized provides a conclusive concentration range for lead d concentration in LBP and precludes the requirement for paint chip laboratory analysis. The results obtained from the XRF indicate whether painted orfinished surfaces contain lead in concentrations exceeding the HUD standard for LBP. This information can be used to determine the appropriate removal and disposal of the i building materials. Additional restrictions for demolition activities may be imposed, because although the d instrument reading may indicate a "negative" for lead, airborne lead concentrations may still exceed the lead I action levels of Cal /OSHAortheCal /OSHA Permissible Exposure Limit (PEL), depending on the site activities. Phase I Environmental Site Assessments TRC has completed ESA projects for the City on both the Patricia Lane Park Project and the Grand Avenue Widening Project, as well for the OCTA for the 1 -5 freeway widening. In addition, TRC routinely conducts Phase I assessments for buyers, sellers, developers, and financial institutions. A summary of this experience is detailed in Section C. Our approach to the ESA is to provide fast response to allow our clients to evaluate a course of action; maintain the schedule for property acquisition, development or sale; and work toward obtaining the investment goals for the property. The ESAs are performed in accordance with standards of the American Society for Testing and Materials (ASTM) as outlined in the Phase I Environmental Site Assessment Process. Specific elements include: • Conduct a physical site reconnaissance of the subject property and adjacent properties for indications of contamination or potential sources of contamination that may impact the subject property. In addition, qualitatively evaluate the building envelope (if applicable) for the possible presence of ACM, LBP, polychlorinated biphenyls (PCBs), and mold. • Interview the current property owner or other knowledgeable persons regarding the current and /or historical uses of the property. • Review an environmental database report of listings for the subject and adjacent properties located within the specified search distances indicated in the relevant Scope of Work and /orthe ASTM Standard. • Review historical information (including past ESAs done for the property and compliance records, if applicable, and aerial photographs, United States Geological Survey [USGS] Topographic maps, Sanborn Maps, and city directories) and building and safety department permits for details regarding the history of site developmentand use of the property. • Research and document local geology, hydrogeology, and site setting. • Contact city, county, and state regulatory agencies for information regarding the subject property and adjacent properties that may potentially impact the subject property. Regulatory agencies contacted typically include City Building and Safety Departments; County Offices of Environmental Health Services; California Regional Water Quality Control Board (RWQCB), California Environmental Protection Agency (Cal -EPA), Department of Toxic Substances Control (DTSC); SCAQMD; and the State of California Department of Natural Resources Division of Oil and Gas.