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RFP No. 18-043 Al - Environmental Site Assessment • Engage with the City's Public Works Agency to develop a clear understanding of all project objectives and obtain any available site information. After approval from the City, engage with the RWQCB, the lead regulatory agency overseeing the LUST cleanup site. • Complete a Phase I ESA to identify on- and off-site environmental concerns. As part of the Phase 1 ESA, research the SWRCB's GeoTracker and the DTSC's EnviroStor databases for information about the site and the neighboring properties. • Complete a Phase II ESA based on the results of the Phase I ESA (including a soil vapor survey to address the potential VEC for existing and proposed structures). Although the focus of the assessment will be to allow the City to redevelop the facility, it is expected that this work will be done under the oversight of the RWQCB who may require a more expansive assessment. • Conduct monitoring activities for existing groundwater wells as needed in conformance with the RWQCB's existing standards for the site. • Prepare summary reports of Phase II ESA activities and groundwater monitoring activities. • Recommend the engagement of the City 's legal department for determining liability of cleanup beyond the known extent of contamination. • Prepare an engineer's estimate of the cost to remediate and monitor, if necessary, any impacts to the site. • Support City's environmental counsel in successful liability negotiations with identified PRPs. • Work closely with the RWQCB and the City to achieve site closure. ENVIRONMENTAL CONCERNS AND CONSTITUENTS OF CONCERN The following is a list of the environmental concerns associated with this site: • Known gasoline fuel release to soil, soil vapor and groundwater. Contaminants of concern include total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and xylenes (BTEX), and fuel oxygenates. • Potential VEC/indoor air concerns from fuel releases to soil and groundwater. • Identifying the PRPs • Long-term liability associated with contamination from on-site and surrounding areas • Worker safety during long-term facility operations APPLICABLE REGULATIONS AND PERMITS A summary of the regulatory requirements and applicable permits is presented below: 1- Project Coordination 2 - Phase I ESA 3 - Phase II ESA • City of Santa Ana • RWQCB Inquiries • ASTM E1903 -11 • EPA SW 846 guidance • Title 8, CCR • Orange County Health Care Agency Drilling Permit • 29 CFR 1910.120 and 1926 • Occupational Safety and Health Administration (OSHA) 40 -hour HAZWOPER training for field staff • California Department of Toxic Substances Control (DTSC)/RWQCB (2015) Advi- sory Active Soil Gas Investigations soil gas sampling protocol • DTSC 2011 Guidance for the Evaluation and Mitigation of Subsurface Vapor In- trusion to IndoorAir (Vapor Intrusion Guidance) • Underground Service Alert ® Ninyo & Moore I City of Santa Ana - (Al) Environmental Site Assessment 1 05-00713 1 June 5, 2018