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I Preliminary Storm Drainage Study Proposed Industrial Park Newton Road, Stockton California The proposed development will occupy approximately 140 acres in a triangular shaped property bounded by Newton Road, Cherokee Road, the Diverting Canal, and the Central California Traction Rail Road. The property is located east of Wilson Way, approximately% mile from State Route 99. Presently, no organized storm drainage facilities exist on the site or adjacent Newton Road. Properties which have developed along Newton Road have installed on-site storm water retention basins to meet their storm water needs. The natural slope of the site is from the intersection of Newton Rd, and Wilson Way southerly to the diverting canal. There is about three feet of elevation change across the property. According to San Joaquin County Assessors Maps, the Sacramento & San Joaquin Drainage District holds an easement across the south side of the property, adjacent to the Diverting Canal. Two basic drainage options exist and are 1) handle all drainage on site, in retention basins and 2) convey water to a point on the south side of the property and discharge it into the Diverting Canal, Handling ali drainage on site would consist of constructing a pond, or ponds to retain storm water. Based on retention pond calculations (as required in San Joaquin County Improvement Standards), a single pond to serve the site would have to hold 60.8 acre feet of storm water. The pond would have a surface area of approximately 7.1 acres of land and would be 11.5 feet deep. With security fencing and room for maintenance around the pond, the total area needed for a retention pond is about 7.5 acres. The layout of the proposed development of the site will, to some extent, dictate the method of providing storm drainage. If there are a few, large parcels, . drainage'could be provided by on-site basins. there are a numer o collection systemowfi smaller a drains parcels, drainage would be provided by g leads to a storm retention pond, or ponds. The proposed development of 25 acres in the northern and of the site will require the construction of a 10.9 acre ebeconsidered ed t mporary and might be d which uses about 1.5 acres. With proper planning, this pond c replaced at a later date by another pond located elsewhere on the site, or storm drainage system. Page I i