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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 µg/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. The laboratory analytical results are attached as Appendix 5 of this report. Soil Profile and Geologic Information The Site is mapped on the Geologic Map of California: San Jose sheet (Rogers, 1966). It is depicted within a map unit of the Modesto formation (Plate 7). The surface and near surface soils located at the Site are reported by the Web Soil Survey (USDA, 2017) to be composed of Archerdale clay loam (Plate 8). The table below presents some selected properties of this soil: Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank and Map (in) Classification mmhos/cm Reaction ability absorption • Symbol pH (in/hr) fields Archerdale 0 Severe: clay loam, 0-8: Clay loam; CL <2 6.6 - 7.3 0.2 - 0.6 8-35: Clay loam, clay, silty <2 6.6 - 7.3 0.06 - 0.2 peres slowly 0-2/o clay loam, CL, CH slopes, 107 35-60: Clay loam, clay, silty <2 6.6 -7.3 0.06 - 0.2 clay loam; CL, CH 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 March 13, 2017, Live Oak excavated shallow and deep soil borings on the proposed homesite parcel of the Site for the purpose of conducting a percolation test. The borings were four inches in diameter, 3.34 and 10.88 feet deep, and were excavated by hand auger (Table 2). The location of the borings is indicated on Plate 9. The soil in the borings was similar to that described by the Soil Survey. Fat clay was encountered to a depth of 4.5 feet, followed by sandy clay with organic material a depth of 10.5 feet, then clayey fine sand to the full depth of the deep hole, 10.88 feet. The soil log is presented on Plate 10. • LOGE 1710 Page 5