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land. The topography of the site is relatively flat, therefore, a proposed septic system design would not have to be altered to accommodate slopes. Both parcels are currently in alfalfa and grain. According to San Joaquin County Environmental Health Department records, there have been five recorded cases of septic system modifications (Repairs/Additions) occurring in the 2 1/2 mile radius study area. This study area was extended to 2 %2 miles from the regular one mile radius to obtain sufficient data due to the low density housing. Two of these applications were for replacement of the existing septic systems and the other three applications were for additional leachlines and pits. [31 PROPOSED DEVELOPMENT OF THE SUBJECT SITE As referenced earlier, it is proposed to divide a 128 Ac parcel into two parcels: Parcel 2 will be 87.93 Ac and Parcel 3 will be 40 Ac gross. It is our understanding parcel 1 consists of 87 Ac and will be purchased by the McCarty Company. Each subject parcel is proposed to have a single family residence as indicated on the attached plot map where the percolation tests were performed. 141 SOIL PROFILE AND PERCOLATION TESTING The Soil Survey of San Joaquin County indicates the soils of the subject parcels as Archerdale clay loam for the top five foot horizon: Typically, the top 8 inches is a dark grayish brown clay loam. The lower 16 inches to 60 inches of the subsoil is a brown clay. This soil description is what was encountered in our subsurface soil investigation. In fact, during the course of drilling, high clay content soil was encountered the entire length of the 24 foot borings. A change in structure occurred at approximately 20 feet below grade in which a heavy gravel/cobble content was encountered, although the soil still consisted of a high percentage of clay. Our percolation tests were performed according to San Joaquin County Department of Environmental Health regulations. The Field Test Data Sheet with the percolation test results can be found in the Appendix. The perc tests performed on parcel 2 and parcel 3 were conducted in the anticipated location of the leachfield area for both of the proposed residences as denoted by Mr. Andy Van Dyk. No shallow percolation tests were performed on the two subject parcels since there would have been little or no percolation due to the high clay content soil at the 42 2