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RFP No. 18-043 Al - Environmental Site Assessment SAMPLE PROPOSAL FOR PHASE I AND PHASE II ESA ARCO SERVICE STATION #5147, 2245 S. MAIN STREET, SANTA ANA, CALIFORNIA (GLOBAL ID NO. T0605900621) LUST CLEANUP SITE The Arco Gasoline Station #5147 is located at 2245 South Main Street, at the northeast corner of Main Street and Warner Avenue, in Santa Ana, California. The site is known to be contaminated from former leaking underground storage tanks (USTs) containing gasoline fuel. The site has an open leaking underground storage tank (LUST) case with the RWQCB. Should the City decide to purchase this Arco property and demolish the existing structures, the scope, schedule, and fee for the pre -demolition hazardous building materials survey would be the same as that described under our Proposal No. 05- 00713 A2 for Hazardous Materials Survey Services for the property at 2246 Orange Avenue. Ninyo & Moore assumes the City intends to purchase the property for future residential redevelopment. We also assume the current gasoline service station will be abandoned after conducting the Phase I and Phase II ESA. Based on the assumed planned purchase of the property, and following completion of the Phase I and Phase II ESA, Ninyo & Moore would recommend the performance of a hazardous building materials survey. Ninyo & Moore is providing our qualifications to the City under our Proposal No. 05- 00713 A2 for Hazardous Materials Survey Services for the property at 2246 Orange Avenue. If Ninyo & Moore is retained to perform services under both contracts, the City would benefit with the cost savings associated with us using cross -trained personnel to perform both services (one site visit) and other sav- ings associated with efficiency of one team on the project. SITE BACKGROUND INFORMATION - This site is an active gasoline service station in Santa Ana, Cali- fornia. A summary of the environmental activities that have been conducted at the site since the discovery of leaking USTs is included as Appendix B, and can be found on the following State Water Re- sources Control Board (SWRCB)'s Geotracker website: (httl2s:Hgeotracker.waterboards.ca.gov/profile reoort.asp?global id=70605900621) Ninyo & Moore's objective is to evaluate the impact of contaminants on environmental media, involve the appropriate regulatory agencies, determine the human and environmental health risks, develop the most appropriate and cost effective remedial action, and address environmental concerns to safely redevelop the property. Based on a review of documents on GeoTracker, Ninyo & Moore believes that the site is eligible for consideration for closure under the Low -Threat Underground Storage Tank Case Closure Policy (LTCP). The criteria for the LTCP, and the site's application for these criteria are summarized in Appendix B. The greatest threat to the site's ability to apply for LTCP is the potential for a vapor encroachment condition (VEC) as a result of off -gassing from contaminated soil and groundwater. As such, Ninyo & Moore would recommend a Phase 11 ESA that would involve the drilling of borings around the site to assess soil contamination and soil vapor encroachment to site structures and nearby residences. The RWQCB indicate concern over vapor encroachment conditions to nearby residences in a letter dated January 5, 2012. In response, a soil vapor survey and health risk assessment was conducted in 2013 that found insignificant health risks to on-site workers and nearby residences. Our proposed scope of services to perform a Phase I and Phase II ESA at the Arco Gasoline Station #5147 located at 2245 South Main Street, will include the following: SUMMARY OF TASKS Ninyo & Moore proposes the following scope of services to meet the objectives of the scenario while addressing the environmental concerns at the site: • Engage with the City's legal department and regulatory agency overseeing the fuel release case (because groundwater was impacted, the oversight agency will be the RWQCB). ® Ninyo & Moore I City of Santa Ana - (At) Environmental Site Assessment 1 05-00713 1 June 5, 2018