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San Joaquin County Department of Planning July 16, 1990 Page 3 mitigation is to create alternate view corridors with the planting of Evergreen trees or similar landscape materials. The proposed mitigation is intended to help block views of the quarry activities and site. The proposed mitigation also provides that the excavation be phased to start at the base of the knoll to allow multiple years of plantings growth for the outlying areas . This impact cannot be reduced to a level of insignificance by new plantings which are not quantified and are not depicted by any graphic to provide a specific plan. On a corollary, the DEIR at page 135, proposes a physical noise barrier at the top of the bluff and in front of the residences which are anticipated to be affected by the noise of the proposed quarry site. This barrier would eliminate the option of or necessity to protect the view corridor(s) at all . On a separate note, the project description and presentation in the DEIR consistently refers to the phasing concept which would provide mitigation by processing the excavation in a gradual movement across the face of the site and restoring the land as the percentage resources are utilized. However, at page S-1, the Summary indicates that the proposed project would involve two phases over an estimated ten-year period of operation. Therefore, the visual resource impact would not necessarily be mitigated on an ongoing basis. These conflicting statements are confusing without a phasing schedule and a specific mitigation plan which requires that a percentage of mitigation be connected with each phase or percentage of impact. 3 . Air Ouality -- The DEIR documents that sources of air emissions from the proposed project would potentially impact air quality as a result of fugitive dust emissions which are associated with aggregate extractions and transportation. The proposed mitigation measures include a recommendation that the applicant conform to the requirements specified under the San Joaquin County Air 4 Pollution Control District ' s Proposed Regulation No. VIII. This new APCD regulation relates to fugitive dust and was proposed in January of 1990. The purpose of the proposed regulation is to reduce the amount of particulate matter entrained in the ambient air as a result of emissions generated from fugitive dust sources. The DEIR documents that the requirement to comply with the new regulation would, in turn, require mitigation measures that would