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DBCP is a nematocide and soil fumigant for vegetables and grapes. It is known to cause male reproductive effects and is classified as a probable human carcinogen. Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set the MCL at 0.2 parts per billion (ppb, equivalent to ug/L) because it believes that given present technology and resources, this is the lowest level to which water systems can reasonably be required to remove this contaminant should it occur in drinking water. The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. Soil Profile and Geologic Information The Site is depicted on the Geologic map of the San Francisco-San Jose quadrangle, California (Wagner et. al, 1991). The Site is depicted within a map unit of the Modesto formation (Plate 9). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Chuloak coarse sandy loam and Delhi loamy sand (Plate 10) (USDA, 2021). The table below presents some selected properties of these soils: Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank and Map /cm Reaction ability absorption Symbol (in) Classification mmhos pH (in/hr) fields Chuloak 0-19 Coarse sandy loam, SM <2 5.6 -6.5 2.0 - 6.0 Severe: coarse 19-44 Sandy clay loam, sandy <2 6.1 - 7.3 0.2 - 0.6 peres slowly sandy loam, loam, SC-SM, SC 0-2% 44-55 Fine sandy loam, SM <2 6.6 - 7.3 2.0 - 6.0 slopes, 127 55-64 Loamy coarse sand, SM <2 6.6 - 7.3 6.0 - 20 Delhi loamy 0-16 Loamy sand; SM <2 6.1-7.8 6.0-20 Severe: sand, 0-2% 16-26 Loamy sand, loamy fine <2 6.1-7.8 6.0-20 poor filter slopes, 142 sand; SM 26-60 Sand, loamy sand, fine <2 6.1-7.8 6.0-20 sand; SP-SM, SM Note: The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for composition and behavior characteristics of the map unit. Soil Borings On February 23, 2021, Live Oak excavated a shallow soil boring near the existing septic system on each proposed parcel of the Site for the purpose of conducting percolation tests. The borings were four inches in diameter, 3.20 and 3.18 feet deep, and were excavated by hand auger (Table 2). The locations of the borings are indicated on Plate 11. LOGE 2111 Page 5