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J Hilvers Residence April 26, 1993 Page 4 f EFFLUENT DISPOSAL HISTORY Site Based on conversations with the current owner, the subject property was used as a dairy from approximately 1950 to 1970. The site has been used as an almond orchard from 1970 to the present. The home and septic system were placed on the property in 1969, with the septic tank being replaced in 1978. There have been no reports of poor performance of the system. LVicinity L The sewage handling in this area consists generally of septic tank use for single family houses. The density of houses in the area is low because of the current zoning status. In conversations with the San Joaquin County Planning Department, L they indicated that the property is zoned AG-40, which indicates that the minimum size of the parcels are to be no smaller than 40 acres. There are provisions that allow for the separation of smaller parcels to be subdivided for the purposes of a private dwelling. A review of the septic tank permits and repair orders file at the San Joaquin County Public Health Services-Environmental Health Department (PHS-EHD) indicate that there have been no failures in the site vicinity. A review of the PHS-EHD Site Data Base, File Location List, and available maps documenting releases of hazardous materials, indicates that there are no documented releases of hazardous materials on i the site or in the vicinity that would adversely impact the groundwater. {„s PERCOLATION TESTS Two percolation tests were performed (see Figure 2 for locations) and conducted in accordance with PHS-EHD practices. Percolation test results indicate that the soil in Parcel 1 (1 .5 acres) has a percolation rate of 9.2 minutes/inch and the soil in the remainder 39.3 acres has a percolation rate of 16 minutes/inch. The soil overall appears to be consistent throughout the area and has passing percolation rates. The data from the percolation tests are presented in the appendix. 4