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Hogan Residence Page 4 EFFLUENT DISPOSAL HISTORY Site Based on conversations with the current owner the subject property has been used as an almond orchard exceeding 10 years. The mobile home and septic system were placed on the property in 1985. There have been no complaints regarding the performance of the system since its installation. Vicinity 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 - they indicated that the property is zoned for AG-40. Which indicate s that the minimum size of the parcels are to be no smaller than 40 acres. In conversations with Aspen Survey they indicated that the area is zoned AG-20 which is no parcel smaller -- than 20 acres. In either case there are provisions that allow for the separating of not less than a 5 acre parcel to be subdivided for the purposes of a private dwelling Additionally, a review of septic tank permits and repair orders file at the San Joaquin County Public Health Services-Environmental Health Department (PIIS-EHD) indicate that although there were some failures in the vicinity they seemed to be more from older systems than problems due to inadequate percolation rate. 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 the site or in the vicinity that would adversely impact the ground water. PERCOLATION TESTS Two percolation tests were performed the locations of which are approximately located on figure 2. The percolation tests were conducted in accordance with PHS- EHD practices. Percolation test results indicate that the soil in Parcel 1 (5 acres) has a percolation rate of 2.1 min/inch and the soil in the remainder 20 acres has a percolation rate of 3.5 min/inch. The soil appears overall to be consistent throughout the area and has excellent percolation rates. The data from the percolation tests are presented in Appendix A.