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Surrounding property use'consists nredominntal.._„ __,r_._ -__<,,� -md, extremely low Fes. density single f� el tow Ging operations, a cattle ranch, refuse di; , � An old, dilapidc iortheast corner of the property. As nc �Si that the septic tank and 5 seepage pit mus 4 :ly is currently zoned Agriculture 40. 1 =:ast not for several decades. + Parcel area and orientations are denoted ori - id in Appendix A. The vast majority of the property is vacant. Pi elines traverse the sub'e _r including but ma f not be limited to,proposed parcels 1. 2. 3 and 4. These pipelines include a Chevron-Texaco oil pipeline, a PG&E natural gas pipeline (both near the Delta Mendota Canal), and underground irrigation pipelines. Any.lessee of a respective parcel must contact the lessors andmore importantly, Underground Service Alert (USA) before digging. As depicted on the attached USGS Map and the Tentative Map, the topography of the site ranges from 220 ft MSL in the southwest corner of the project to 140 ft MSL in the northeast corner. This gives a land declination toward the northeast of. (220 - 140 = 80 ft) - -5,280 ft= 1.5%. Therefore, septic system design criteria for slopes do not have to be considered. A review of Application Permits on file with the Environmental Health Department reveals there has been one Application for Repairs/Additions to septic systems within the one-half mile study radius area. This can be considered a very low number of Repairs/Additions/Replacements, and can be attributed to the extremely low housing density. The subject property is in an area designated as "Hardpan"by EHD's colored map denoting the various soil types and septic system requirements throughout the County. Therefore, since the water table is deep in this area at approximately 78 feet, and the fact that the shallow soil structure throughout the property is poor for effluent management by leachlines, seepage pits and sumps are allowed to be installed in this area. III. SOIL PROFILE AND PERCOLATION TESTING As noted on the USDA Soil Survey map, the property soils predominately consists of Capay clay (#118), with the remaining portion of the property soils in the northeast corner and center of the subject property composed of El Solyo clay loarn (#156) and Vernalis Clay loam (#269). These three soil types have a high surface soil clay content percentage which is favorable for the retention of ammonium molecules emanating from septic effluent, and therefore suppression of nitrification. Page-3- Chesney Consulting