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Cleanup in Vulnerable Communities'Initiative Final Project Reference:Bobson Cleaners Discovery and Enforcement Discovery Project Number:60688620-5.1 Investigation Work Plan either waste oil and/or petroleum. It is unknown if both were stored in the UST or if there were two USTs on site.The USTs were listed as inactive on the EDR report and contained waste oil and petroleum. No other information is available on the EnviroStor or GeoTracker websites for this facility. Due the unknown historical information from the case closure of the USTs, regulatory status, and hydrogeological position relative to the Site(i.e., up-gradient),this facility presents a REC to the Site. • Manteca Tire(201 West Edison Street)is located approximately 235 feet to the west of the Site and listed on the EDR as RCRA NonGen/NLR, CERS Haz Waste, CERS, HTWS. This facility is listed as a chemical storage facility and has had several violations related to its business plan, uploading of documents and emergency response plans. The facility was also found in violation of nor accurately reporting hazardous materials stored onsite. A bulk 200-gallon oil AST, bulk 200-gallon waste oil AST, 55-gallons of new antifreeze, and 55-gallons of waste antifreeze were found onsite and not properly reported in 2015. Due to unknown historical information regarding the stored chemicals on the facility,this facility presents a REC to the Site. No controlled RECs(CRECs), historical RECs(HRECs), or de minimis conditions(DMCs)were identified in connection with the Site during the ESA. Based on the above-described activities,AECOM recommended conducting a limited Phase II ESA to further assess the following RECs and items of concern: • Conduct a site investigation around the former dry cleaner to assess potential chlorinated solvent impacts to media of concern at the Site. • Conduct soil vapor sampling onsite to assess potential for vapor encroachment condition (VECs)from off-site sources, i.e.the historical USTs and automotive repair located to the west,southwest and north of the Site. • Although not a REC, impacts resulting from the presence older structures built before 1973 the potential for asbestos containing materials(ACMs), lead-based paint, and pesticides is likely.This is a potential item of concern and therefore AECOM recommends collecting soil samples throughout the Site and analyze for asbestos, lead-based paint,and pesticide(termiticide)impacts. Aside from the 2023 AECOM Phase I ESA, no other reports have been prepared in connection with the Site. 2.7 Future Water Supply The Site is located within the Eastern San Joaquin Valley subbasin of the San Joaquin Valley aquifer system and is covered by the Eastern San Joaquin Groundwater Authority. 2.8 Observations from Site Reconnaissance As part of the Phase 1 ESA, a site reconnaissance was conducted by AECOM on August 9th, 2022,with the intent of contacting the Site owner/manager.The site visit methodology consisted of walking over accessible areas of the Site, the perimeter, and portions of the surrounding area.At the time of the site visit,the Site was a commercial building occupied with two commercial businesses. AECOM did not have access to the interior of the structure. AECOM was able to access the entry way of each business upon arrival and made visual observations and documented what was seen. No features of the former dry cleaner could be seen inside either business during the site visit. The Site is developed with a rectangular-shaped single-story building on the eastern portion of the Site and the remainder of the Site is asphalt-paved parking lot,with the exception of the southwestern corner which is a dirt lot. The building is occupied by two businesses, Best Foot Massage and His Will Insurance. There is a PG&E pad- mounted transformer and a natural gas meter near the northwest corner of the of the building. PG&E supplies the building with natural gas and electricity. Utility poles run east and west along the northern and southern boundaries of the site. No visual evidence of present aboveground storage tanks(ASTs)or underground storage tanks(UST's), irrigation or potable water wells, monitoring wells, dry wells, clarifiers, septic systems,discolored soil, standing surface water, stressed vegetation, or unusual odors was observed on the Site. Prepared for: Department of Toxic Substances Control AECOM 9