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[6] Continued. All recommended sewage disposal areas are to be in compliance with the regulations of the San Joaquin Department of Environmental Health. Any sewage disposal area must conform with all of the "distance" separation requirements from applicable objects. [7] CONCLUSIONS The results of the percolation tests indicate there is fast percolation of the shallow borings for both Parcel No. 1 and the DR at 1. 7 min/in and 2 . 7 min/in, respectively. Although these percolation rates translate to a recommended sewage disposal area of 6, 000 square feet, it is our recommendation that there be an 8 , 000 square foot leaching area, with a 50% expansion area. Depending upon the encountered leach field soil structure during leach line emplacement, and the number of bedrooms/occupants of the residence, between two and eight sumps should be placed at the ends of the leach lines. Recommendations for sewage disposal areas and related septic structures such as sumps are primarily a protection measure for the underlying groundwater and potentially the Calaveras River. Our recommendation for the installation of sumps is primarily based upon the fact that sumps have been placed in septic systems in the - surrounding area. In all probability, the leach field will be placed near the existing walnut orchard. Care must be taken during irrigation periods so as to not inundate the leach field area. However, brief time periods of water saturation in the leach field is not adverse, since denitrification is promoted. The nitrate molecule acts as an electron acceptor and is reduced to gaseous nitrogenous forms such as nitrogen and nitrous oxide. Additionally, any nitrogen fertilization of the adjacent walnut orchard must be carefully applied to prevent nitrate overloading of the area. 5 :f *°fit4 (-nnhol 'n P-1111: