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RFP No. 18-043 Al - Environmental Site Assessment collected on March 16, 2012. This exceeds LTCP criteria of 100 mg/kg, which may hinder the ability to close the site. As such, the RWQCB may require that soils in known hot -spot areas be excavated and removed between approximately 5 and 10 feet logs, or to first encountered groundwater. • The HHRE conducted during the Phase II ESA may determine a VEC for future residential occupants. Because of this, future residential site structures may require vapor mitigation measures. The most cost-effective mitigation measure for this site will likely be to install a vapor barrier as part of the foundation system of new structures. The additive construction costs for such a system is estimated to be approximately $3-$7 per square foot of foundation. Once the RWQCB agrees to case closure and termination of the groundwater monitoring program, Ninyo & Moore will obtain permits from OCHCA to abandon the groundwater monitoring wells in accordance with California Well Standards Bulletin 74-90 and OCHCA permit regulations and requirements. The RWQCB will send the RP a correspondent letter notifying when it is appropriate to proceed with well abandonment/decommissioning activities. Additionally, a "no further action" letter will be issued for the site to document case closure after all necessary administrative/procedural processing and public notification requirements have been completed in accordance with agency guidance/protocol and applicable law. ANTICIPATED DELIVERABLES Ninyo & Moore anticipates the following deliverables will be prepared for this work: • Scoping Document for the City and RWQCB • Phase I ESA Report including VEC evaluation • Phase 11 ESA Work Plan (including SAP, QAPP, HASP, and CHASP) • Permit applications • Phase 11 ESA Report (including HHSE, geophysical survey report, analytical laboratory reports, and waste manifests) • Groundwater Monitoring Report • Site Closure Report • Permit closeout submittals • Cost to Closure Estimate PROPOSED SCHEDULE Ninyo & Moore's proposed schedule to perform Tasks 1 through 6 at the ARCO Service Station #5147 in Santa Ana includes the following: Preparation of Phase I ESA 4 weeks Develop a Phase 11 ESA Work Plan based on the results of the 3 weeks Phase, IESA Implementation of the Phase 11 ESA Work Plan 1 week Preparation of the Phase ll ESA Report 3 weeks Annual Groundwater Monitoring Event 1 week Preparation of the Annual Groundwater Report and upload to 3 weeks GeoTracker Permit closeout submittals & Cost to Closure Estimate 12 weeks Ninyo & Moore I City of Santa Ana - (A1) Environmental Site Assessment 105-00713 1 June 5, 2018