Laserfiche WebLink
Table 1. Selected Properties of On -Site Soils (USDA, 1992) <br />Soil Name <br />Depth <br />Unified Soil <br />Salinity <br />Soil <br />Perme- <br />Septic tank <br />and Map <br />(in) <br />Classification <br />mmhos/cm <br />Reaction <br />ability <br />absorption <br />Symbol <br />pH <br />(in/hr) <br />fields <br />Bisgani <br />0-11: <br />Loamy coarse sand; SM <br /><2 <br />7.4-8.4 <br />6.0-20 <br />Severe: <br />loamy coarse <br />11-60: <br />Coarse sand, loamy <br /><4 <br />7.4-8.4 <br />6.0-20 <br />wetness, <br />sand, partially <br />sand, loamy coarse <br />poor, filter. <br />drained, 0- <br />sand; SM, SP -SM <br />2% slopes, <br />109 <br />Tinnin loamy 0-28: Loamy coarse sand; SM <2 6.1-7.8 6.0-20 Severe: <br />coarse sand, 28-53: Loamy coarse sand, <2 6.1-7.8 6.0-20 poor filter <br />0-2% slopes, loamy sand; SM <br />255 53-75: Loamy coarse sand, <2 6.6-8.4 6.0-20 <br />loamy sand, sand; SM <br />Note: The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for <br />composition and behavior characteristics of the map unit. <br />Soil Borings <br />On September 8 and 15, 2022, Live Oak excavated shallow borings near the existing or <br />proposed septic disposal areas of the new parcels of the Site for the purpose of <br />conducting percolation tests. The borings were four inches in diameter, 1.94 to 2.39 <br />feet deep, and were excavated by hand auger (Table 2). The locations of the borings <br />are indicated on Plate 12. <br />The soil in the borings was similar to that described by the Soil Survey. On Parcel 1, <br />silty, fine to medium sand was encountered to the full depth of the hole. Silty, very fine <br />sand was encountered to the full depth of the hole on Parcel 2. The soil on Parcel 3 <br />was silty, fine to coarse sand to the full depth of the hole. The soil logs are presented <br />on Plates 13 through 15. <br />Discussion of Soil Lithology <br />Based on the soil observed in the borings, there appears to be good potential for <br />percolation in the shallow soil zone. Sandy soils generally have a much greater <br />potential for percolation than fine-grained or cemented soils. However, a percolation <br />test is the only accepted method for determining the suitability of the soils for a septic <br />disposal area. Percolation test results are discussed in the following section. <br />Percolation Test <br />A shallow percolation test was conducted at each test location. The soil borings <br />discussed above were used for the percolation test holes. Percolation test procedures <br />conformed to San Joaquin County Environmental Health Department policy. <br />LOGE 2233 Page 6 <br />