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Revised Work Plan – Mitigation of Trash and Debris from Private Property Site Private Property – 19133 East Liberty Road, Clements, California May 26, 2023 (Rev June 27, 2023) Project No. 21-899 2 groundwater well was issued by the EHD in 1977 and a permit for the installation of a septic sewer at the Site was issued by the EHD in 1978. Around 1993, based on aerial photo review, the Site was disturbed by site activities especially to the north of the existing house. In the 2005 to 2016 aerial photos continued site disturbance was noted in the area north of the house. The area of disturbance generally matches the outline of the area with debris at the Site. The property during the time the debris appears to be placed on-site occurred while Mr. Mulhair owned the property from at least 1996 to until 2017. The EHD received a report from an adjacent landowner to the Site in 1996 of illegal dumping at the Site and directed Mr. Mulhair to remove the debris from the Site. Evidence in aerial photos indicate debris was continued to be placed on the Site since 2005 and later. The EHD received another complaint from an adjacent landowner in 2017 and noted during a site inspection in 2017 of debris on the Site. EHD requested the debris be removed from the Site and documented where the waste and debris be disposed of. The EHD inspection report dated November 12, 2021 noted an on-site meeting was held on July 29, 2021 to discuss future site requirements. A work plan was submitted and approved by the EHD for performing a Phase II site investigation to establish waste characterization of the debris. A Phase II site investigation was performed at the Site from August 10 through 12, 2021 including advancing five trenches to collect soil samples and document the type and extent of trash and debris in the dump portion of the Site located primarily north of the residence. The area marked on Figure 2 indicates the approximate limits of trash and debris to be removed as part of the proposed remedial activities. The trench depths ranged from approximately four to 15 feet below ground surface (bgs) with a total of fifteen soil samples collected from each of the trenches. Select soil samples were analyzed for total petroleum hydrocarbons (TPH), polychlorinated byphenyls (PCBs), asbestos, heavy metals and semi volatile organic compounds (SVOCs). Soil in the field was also screened for volatile organic compounds (VOCs) with a photo ionization detector (PID). A water well sample was collected and analyzed for chemicals of concern and soil samples of stockpiled material from the excavations were collected for analysis. An additional eight potholes were advanced around the Site to establish the approximate contact of the undisturbed portion of the Site with the debris. The EHD November 12, 2021 inspection report states the majority of the debris has been delineated except for a portion along the west side of the property. Laboratory analytical results indicated minor concentrations of TPH as diesel and motor oil, SVOCs and heavy metals. No VOCs were detected with the PID during the site characterization activities. Asbestos was not detected in any of the soil samples analyzed. The laboratory data indicated that minor amounts of contamination found in site soil surrounding the debris do not pose a significant environmental health risk or hazard. The well sample analytical results did not indicate any chemical constituents exceeding California drinking water standards, Title 22 of the California Code of Regulations (CCR) dated July 22, 2021 maximum contaminant levels (MCLs). Based on the soil stockpile sample analytical results, this soil was characterized either as non-Resource Conservation and Recovery Act (RCRA), California-designated hazardous waste or non-hazardous waste.