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F expansion plans includes enlarging the milk barn to accommodate an increase in A new restroom will also be constructed which is addressed in the Soil Suitability II. SOIL SUITABILITY STUDY SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION The subject property and surrounding area are zoned AG-40 with the General Plan designation as agriculture. Directly north of the Quaresma Dairy, is the Machado Dairy with the surrounding acreage consisting primarily of crop production for cattle feed. The surrounding housing to the south of the property is low density, single family houses and ranchettes. There are five dairies in the surrounding region which includes acreage south of West Ripon Road, between Manteca Road and Airport Way. The Quaresma Dairy site has been a dairy for more than 50 years. The topography of the dairy is comparatively flat as illustrated on the attached United States Geological Survey (USGS)map. Currently, the area designated for the future leachfield slopes to the west. This slope is less than five percent; therefore, it may not be necessary to accommodate for sloping effects in the septic system design. However, if there is a significant change in the final grade, sloping effects may have to be accounted for. This will be a determination made by the septic system contractor and the San Joaquin County Environmental Health Department. It can be assumed that City of Manteca water and sewer will not be installed in this area for decades, if ever. A review of Application Permits on file at the San Joaquin County Environmental Health Department reveals there have been 8 Applications for Repairs/Additions in the one-half mile diameter study area, two of which were for the subject facility. Most of these applications for modifications were for additional drainage to existing systems, including shallow sumps. This number of repair applications can be considered excessive for the study area,thus indicating the surface and subsurface soils are not overly conducive for shallow effluent percolation. SOIL PROFILE AND PERCOLATION TESTING Because the percolation test was conducted in an existing corral, the test was conducted in the extreme southwest corner of the corral so that the boring could be cordoned off to prevent disturbance by the cows. The surface soil structure in the proposed area of the leachfield consists of a silty clay for the top one foot. Below this layer exists a very fine sandy silt with some clay. The underlying soil profile down to perc test depth of 42 inches is found on the FIELD PERCOLATION TESTING REPORT. This fine sandy silt soil type is more conducive for septic effluent management than other soil types found on the subject ranch that consist of heavier clay-type soils. 2 Vaa!y Ag Research