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Work Plan – Mitigation of Trash and Debris from Private Property Site Private Property – 19133 East Liberty Road, Clements, California August 31, 2022 Project No. 21-899 1 1.0 INTRODUCTION This Work Plan discusses the mitigation actions that are considered necessary for the removal of trash and construction/demolition debris described in the Site Characterization Report (Sharp Environmental, 2021). Specifically this Work Plan describes the procedures for the excavation, screening, stockpiling, loading, transportation and disposal of trash and debris at the Private Property located at 19133 East Liberty Road, Clements, California (the Site). This Work Plan was prepared in response to comments from the San Joaquin County Environmental Health Department (EHD) in their March 2, 2022 inspection report (Appendix A) following their review of the Phase II Subsurface Soil Investigation. The EHD noted Hayward Environmental plans to remove the site debris including documentation of debris disposal. The inspection report states after the Area of Concern (AC) is mitigated, the EHD will remove the AC comment on future inspection reports. The intent of the work proposed in this Work Plan is to close the Site and request the EHD to change the property (Mulhair Disposal Site) status as an unpermitted solid waste disposal site, remove the Site from the Solid Waste Information System (SWIS) database and restore the Site to an unrestricted land use scenario with a Clean Closure. 1.1 SITE LOCATION AND BACKGROUND The Site is located at 19133 East Liberty Road, Clements, California. The Site is bounded on the north by residential property 19155 East Liberty Road, on the east by residential properties 19199 and 19211 East Liberty Road, and on the south by East Liberty Road. On the south side of Liberty Road is residential property 19412 East Liberty Road. Along the western side of the property is residential property 19019 East Liberty Road and undeveloped land to the west of the Site’s mid to northern west side. Currently there is one residential house on the property and a groundwater well. The Mokelumne River channel is approximately 3,000 feet southeast of the Site. Figure 1 presents a site location map of the subject area. A Phase I Environmental Site Assessment (ESA) dated July 10, 2020 and prepared by Hayward Environmental Consulting indicated that the property had been previously undeveloped land except for a small structure from approximately 1909 to approximately 1936. The current residential structure was built in the late 1970s. A permit for a 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