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F y SSS 3. Parcel areas and orientations are denoted on the attached Site Plan Map, found in Appendix A. The e fire p� e y is vacant,with no residential structures°existing on the property as of this date. SSS 4.3-4.5 o wells exists on the property that could have been sampled for analysis. It is unknown ether municipal sewer will serve this area of Tracy at some time in the future. Irrigation pipelines currently traverse the property to irrigate the remaining acreage of each individual Parcel. /As depicted on the attached USGS Map and the Tentative Map, the topography of the site ranges from 40 ft MSL in the southwest corner of the project to 30 ft MSL in the northeast corner. This gives a land declination toward the northeast of. (40 - 30 = 10 ft) _ --2,640 ft= 0.4%. , Therefore, septic system design criteria for slopes do not have to be considered. f x� . , d SSS§',3.2t7,(; 3 5 3.7 A review of Application Permits on file with the Environmental Health Department reveals there have been four Applications for Repairs/Additions/Replacements to septic systems within the one-half mile study radius area. This can be considered a medium number of Repairs/'Additions/Replacerrients, and can be attributed to the surrounding housing and commercial facility density within the study area. i. The property is in an area designated as "High Water Table"by EHD's colored map, which I denotes the various soil types and septic system requirements throughout the County. Therefore, since the water table is shallow in this area at approximately 8.5 feet and the fact that the shallow soil structure throughout the property is acceptable for effluent fnanagement by leachlines as demonstrated by the percolation test results, seepage pits and sumps are not allowed to be installed in this area of San Joaquin County. The total number of potential on-site septic systems may be 22, with second unit dwellings. This is one system for every five acres on the site, which can be considered a low density. III. SOIL PROFILE AND PERCOLATION TESTING NLS§ 1.1 As noted on the USDA Soil Survey map, the property soils consist of Capay clay(#118), This soil type is moderately drained with slow-to-medium permeability. Because of this high clay € /Well soil, a soils engineer should assess the on-site-soils for foundation recommendations. j/Well Driller's Logs were found for nearby wells, as noted in Appendix G. Underlying soil morphology under the study area consists of clay, sand and gravel. It appears the Corcoran Clay layer is found from approximately 200 ft to 300.ft. SSS§-(�j) 3 Logs of Boring using the Unified Soil Classification System (USCS) as observed from each of the shallow.perc test borings, are found on the respective EHD Percolation Test Data Sheets. Since two water table borings were completed on Parcels 10 and 17, the Logs of Boring for these Parcel also include soil classifications down to the encountered water table. Generally, the on-site surface soils (0 to 42 inches) are a lean clay with varying percentages of sand and silt E content. The deeper subsurface soils show variability from a clay soil at the southwest area of the property, to a sandy clay loam in the northeast area of the property. Page -3- Chesney Consulting