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irrigation related to agriculture. Following the installation of streets (approximately 3000' of 60' wide and 50' wide right-of-way), 4.10 acres of farm land will be paved and thereby removed from culti- vation. The walnut trees will remain, but the installation of lawns and walkways and driveways will affect soil utilization. While garden beds allow rain water percolation, sodden lawn surfaces will provide for a larger increment of runoff. A large amount of soil will also be removed from production of food by the houses that will be built upon the site. Total land coverage amounts to about 1.5 acres exclusive of driveways and fences, tool sheds and chicken coops, or swimming pools. The Uniform Building Code requires adequate site preparation in areas with plastic soils with high shrink -swell characteristics (Sec. 2904 UBC 1973 Edition) in conjunction with the Uniform Building Code and the State Subdivision Map Act, the local Subdivision Ordinance Section 9.075 requires a preliminary soil report. If this report indicates "Critically expansive soils or other soil problems which, if not corrected, would lead to structural defects, the subdivider shall provide for and sub- mit the findings of a soil investigation of each lot in the subdivision." The determination of the need for a lot -by -lot soil analysis is made by the Building Inspector. Any appeal of a decision requiring a soils report would be made before the Planning Commission. The present subdivision is proposed on Capay Clay Loam and Landlow Adobe Clay (See Section on Soils, P.3). Portions of the site may be subject to expansive action. 2. Water is affected by the addition of 43 homesites. While it is true that more water is pumped from the groundwater for irrigation, it is also true that more water percolates into the ground in agricultural sites. Drainage for the proposed subdivision is channelled into a drainage system that is emptied by pump into the drainage swale shown on the Plot Plan of the subdivision. Since water runs off of all housing and pavement, it is likely to pick up some oils, detergents, insecticides and other contaminants. For the present, Walnut Acres proposes to use a containment basin with the subdivision. Eventually, a drainage system planned for Cherryland Avenue could be connected to drain this subdivision. When that occurs, contaminants would be washed into the Calaveras River and ultimately into the Sacramento -San Joaquin Delta. Until the drainage system planned is -23-