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II. SOIL SUITABILITY FINDINGS This Study presents our investigative results of the soil strata and groundwater under the subject dairy facility to find out if the subject property is acceptable for traditional septic systems. This Msection of the entire study is in compliance with the requirements of Section 9-1110 item (c) of the San Joaquin Ordinance Codes. The structures on the subject property applicable to the Soil Suitability Study are the Milk Barn, and three single family residences, and three mobile homes. Each structure has a septic system composed of one septic tank, leachlines and sumps at the ends of the leachlines. It is anticipated these structures will remain as the only on-site structures which will have septic systems. STUDY AREA DATA The surrounding study area consists mainly of irrigated agriculture. History of the subject property is irrigated row crop. The soil profile in the study area consists of a high percentage clay content soil. Hydrometer test results indicate the indigenous soil to be over 42 percent clay throughout the soil profile. In addition, the soil is extremely consolidated and is not loose as are other types of clays. Soil profile information was obtained from the Soil Conservation Service in Stockton. From the published soil maps, the subject property soil is determined to be a Capay Clay, Willows Clay and Columbia Fine Sandy Loam Description. This high clay content and "tight" soil structure is not conducive for sewage effluent percolation. Information regarding the underlying groundwater was obtained from an investigation conducted in the summer of 1994. The results of this study show the water table elevation is variable throughout the subject property. Four borings illustrated the static water table varied from 12 feet to over 25 feet below existing grade. The elevation of grade did not change dramatically over the relatively small area where the groundwater study was performed. This area was primarily around the proposed site for the wastewater ponds, before earthwork procedures. The density of the surrounding study area to a one mile radius can be considered low. According to the attached USGS topographical map, there are approximately eleven structures per square mile. Population density is an important factor to consider when assessing the 2 vaffey Ag Research