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t QX-94-1: Revised Initial Study (cont.) Water 1.a. Although the site is shown within Flood Zone C, there may be localized flooding along Hospital Creek. This is considered to be a less than significant impact, however, as the creek banks will be bermed through the site to prevent flooding of the adjacent pits. b. The project has been designed to that all runoff from disturbed surfaces will remain within the pits, and process water will be stored in a sedimentation pond. No hazardous materials or heavy metals are USFId in the aggregate processing that could potentially contaminate ground or surface water. NO sedimentation is expected, as all runoff from disturbed slopes will be retained on the site. C. The excavation will result in the creation of three large pits approximately 100 to 130 feet deep, which will result in changes to the site's drainage. Hospital Creek is proposed to be bermed. Earth 2.a., b., c. The applicant is proposing to excavate 282 acres of the 501-acre site. The excavation will include four pits; one is to be reclaimed to "at grade" level, and the other three are to be reclaimed from 100 feet to 130 feet below surrounding grades. Approximately 202.4 acres will be composed of pit slopes or walls, with 80.3 acres remaining in the pit bottoms proposed to be reclaimed to open space for grazing. There will be a loss of approximately 202.4 acres of prime and nonprime agricultural land, which is considered to be a significant impact. It is also questionable whether or not it will be feasible or possible to reclaim the three pit bottoms to agricultural uses such as grazing, given the depth and steepness of the slopes. Excavation will occur to a final finished slope of 2:1, with no backfill required. The applicant is proposing 12-foot benches every 50 feet on the pit slopes. Given the depth of the pits, and the proximity to major transportation facilities, bridges, and utility conveyances(pipelines and transmission lines), it is not known if pit slopes will be stable. Air/Climate 4.a., 14. The Draft EIR prepared for the nearby Vernalis Interchange project identified short-term construction related air quality impacts as being significant and unavoidable. Excavation of this site will add incrementally to adverse air quality impacts. Revised Initial Study - 9 - CSX-94-1