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RFP No. 18-043 4 -Groundwater ` DWR Monitoring • RWQCB 5 - Prepare Reports City of Santa Ana + RWQCB 6 Responsible Parties • ASTM E-2137-17 Determination and Estimate City of Santa Ana legal counsel of Cost to Closure RWQCB Al -Environmental Site Assessment PROJECT UNDERSTANDING AND TECHNICAL APPROACH Ninyo & Moore will perform the following tasks to successfully meet the objectives: Task 1 - Project Coordination Ninyo & Moore will work closely with the City's project manager regarding project schedule, coordination with site contacts and subcontractors, budget tracking, preparation and submittal of invoices, and compliance with the scope of work. The project manager will track and optimize project scope and schedule on a weekly basis using internal Ninyo and Moore tools, and will receive updates from personnel involved with the project. An important aspect of successful performance is the implementation of an initial meeting with the project team to strengthen collective understanding of the project objectives. Thus, prior to field implementation, Ninyo & Moore will conduct a project kick-off meeting with the City and an in-house kick-off meeting with staff to discuss health and safety at the site, pre -field planning, scope of work, project objectives and assumptions, and project schedule. After authorization from the City, Ninyo & Moore will meet with the RWQCB to ensure their requirements for site assessment are met. Task 2 - Phase I ESA Ninyo & Moore will perform a Phase I ESA as follows: • Conduct the Phase I ESA in a manner consistent with the ASTM 2013 guidance (Designation Number E1527-13) and the EPA All Appropriate Inquiry rule. The objective of this assessment was to evaluate whether past or current activities resulted in RECs as defined in ASTM E1527-13. • Review and document the environmental history of the site including: review of utility plans showing historical equipment/structure locations; historical aerial photographs to assess past and present uses of the site and adjacent properties; facility reports including business contingency plans, spill prevention, control and countermeasures plans (SPCCs), SWPPPs; clarifier and hoist records; and site assessment and clean-up reports (including the UST removal documentation). • Review regulatory agency databases including those available on EnviroStor, GeoTracker, and on- line databases. • Interview parties familiar with the site environmental history and historical operations and performed a site walk with personnel knowledgeable about the site operations and history. • Prepare a summary of this historical research and include preliminary scoping for Task 3 - Phase II ESA. Task 3 - Phase 11 ESA Ninyo & Moore will perform a Phase II ESA as follows: To investigate the AOCs/RECs identified in the Phase I ESA we will advance 12 exploratory borings. The goal is to evaluate the presence of contamination on site among multiple media (soil, soil vapor, and groundwater), waste types, and chemical characteristics; and to evaluate the inhalation risk from existing site contaminants to future occupants. The laboratory analytical and survey data will be uploaded to the SWRCB GeoTracker database along with the final Phase II ESA report to comply with RWQCB requirements. To complete the Phase II ESA, the following tasks will be performed: ® Ninyo & Moore I City of Santa Ana - (Al) Environmental Site Assessment 1 05-00713 1 June 5, 2018