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color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. <br />Ingestion of high levels of nitrates over time can also lead to gastric problems. <br />DBCP is a nematocide and soil fumigant for vegetables and grapes. It is known to <br />cause male reproductive effects and is classified as a probable human carcinogen. <br />Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set <br />the MCL at 0.2 parts per billion (ppb, equivalent to ug/L) because it believes that given <br />present technology and resources, this is the lowest level to which water systems can <br />reasonably be required to remove this contaminant should it occur in drinking water. <br />The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. <br />Soil Profile and Geologic Information <br />The Site is depicted on the Preliminary geologic map of the Bellota quadrangle, <br />California (Marchand and Bartow, 1979). The Site is depicted within a map unit of the <br />Riverbank formation middle unit, described as "foothill -derived alluvial sand and silt; <br />contains abundant volcanic detritus" (Plate 8). <br />The surface and near surface soils located at the Site are reported by the USDA Web <br />Soil Survey to be composed of San Joaquin loam, thick surface (Plate 9) (USDA, 2021). <br />The table below presents some selected properties of this soil: <br />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 />San <br />0-12: <br />Loam; CL -ML, ML <br /><2 <br />5.6-6.5 <br />0.6-2.0 <br />Severe: <br />Joaquin <br />12-26: <br />Sandy clay loam, SC <br /><2 <br />6.1-7.3 <br />0.2-0.6 <br />cemented <br />loam, thick <br />26-35: <br />Clay loam, clay; CL <br /><2 <br />6.1-7.8 <br /><0.06 <br />pan, peres <br />surface, 0- <br />35-60: <br />Indurated <br />--- <br />--- <br />--- <br />slowly <br />2% slopes <br />240. <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 10, 2021, Live Oak excavated a shallow soil boring near the proposed <br />septic disposal area of the Site for the purpose of conducting a percolation test. The <br />shallow boring was four inches in diameter, 3.24 feet deep, and excavated by hand <br />auger. Based on initial percolation rates observed, Central Valley Septic Services was <br />retained to drill a deep boring; the deep boring was advanced on September 23, 2021 <br />with a Spiradrill LHD 50. The deep boring was 12 inches in diameter and 11.55 feet <br />deep (Table 2). The location of the borings is indicated on Plate 10. <br />LOGE 2147 Page 5 <br />