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San Joaquin County Department of Planning July 16, 1990 Page 4 potentially further reduce the dust impacts from this site. However, the actual mitigation measure proposed is not to "require" but only to "recommend" that the applicant conform to the requirements of the new APCD regulation. At a minimum, the mitigation measure should be a requirement that the pending regulation for fugitive dust, as proposed by the San Joaquin County APCD, be complied with. The DEIR also documents that the e::isting predominant air flow causes significant air quality problems. Given the information that the proposed quarry site has announced a mitigation measure to stockpile the prime soil for replacement, it would appear appropriate to require a mitigation measure that determines the location, height, phasing, and maintenance of the proposed stockpile given the geography of the prevailing winds from the west which will carry dust and contaminates into the 5 adjacent inhabited and urbanized areas. The only affective mitigation to control the dust impact is the proposed utilization of 10, 000 gallons of water per day which must be obtained from an existing well at the adjacent processing facility and trucked to the quarry area via a proposed access road. Given the existing water resource impact in the County of San Joaquin, using 300, 000 gallons of water a month for ten years to control dust hardly qualifies for a rational mitigation measure. 4 . Geology And Soils -- The Notice of Preparation (NOP) identified a significant impact in the Initial Study regarding the potential for slope failure relative to any excavation near the foot of the adjacent bluff on the south and east side of the project area which could result in erosion. The DEIR validates that excavation may endanger the stability of adjacent terrace 6 slopes. The proposed mitigation measure is to minimize the potential for any impact to slope stability of the bluff areas by requiring minimum setbacks for excavation. The mitigation measure proposes that the minimum setbacks be established by a soils engineer or certified engineering geologist. This mitigation measure is incomplete if it does not require that the Department of Public Works approve of the proposed minimum setback.