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Brief Explanation of the Rationale for the Finding Pursuant to Public Resources Code Section 21081(a)(1),the Board of Supervisors finds that the project's adherence to the following mitigation measure will reduce the potential impact of this significant effect to a less than significant level: MM 4.5-5. The Project shall provide a worker changing facility(see Section 3.3.2). This facility will provide an area where all workers will be required to remove used Personal Protective Equipment(PPE) prior to leaving the biosolids landfill area, and where people entering the facility will have to change into their Personal Protective Equipment stored at the worker changing facility. The provision of the worker changing facility is to provide hygienic conditions to protect the safety of the workers while preventing the use of work clothes and boots outside of the biosolids work environment. The changing facility will include portable toilet and washing facilities, and a boot rinsing area for the workers. Potential Significant Effect Without appropriate mitigation,the project may result in future impact to the plugged and abandoned oil well, Blackwell# 1,API#02969767. Description of Specific Impact Located within the Pit"F/G Connection Area" is a plugged and abandoned oil well, Blackwell# 1,API# 02969767. The well was properly plugged and abandoned in 1983 and a recent inspection identified no indication of any oil and gas being present at the well location or in the immediate vicinity (Joe Austin, DOGGR- personal communication, 2004). An in situ well-indurated soil column, approximately 50 feet in diameter was left around the well casing when the pit was excavated. This in place soil column represents a buffer around, and protects the integrity of the well casing, corroborating a conclusion that the casing of the oil well remains intact. However, during construction and daily operational activities after implementation of the proposed Project, there is a possibility for accidental impacts to the well. Excavation and grading could disturb the well casing compromising the integrity of the well's abandonment. This could lead to the release of hazardous materials (i.e. liquid and gaseous hydrocarbons) into the environment. Fmdin Changes or alterations have been required in, or incorporated into the project that substantially lessen the potentially significant effect as identified in the Final EIR, so that environmental effects after such mitigation are reduced to a less than significant level. Brief Explanation of the Rationale for the Finding Pursuant to Public Resources Code Section 21081(a)(1), the Board of Supervisors finds that the project's adherence to the following mitigation measure will reduce the potential impact of this significant effect to a less than significant level: Findings of Fact—Section 15091 March 15,2016 H.M. Holloway Landfill Modification Project Final Board of Supervisors 31