SU0011816 SSNL - Laserfiche WebLink

Home Browse Search

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 pg/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 Preliminary geologic map of Cenozoic deposits of the Bellota quadrangle, California (Marchand, D.E., and Bartow, J.A., 1979). It is depicted within a map unit of the Modesto formation upper member, described as "foothill-derived alluvial silt, clay, and minor sand forming terraces, upper fans, and following distributaries across lower fans; abundant volcanic detritus" (Plate 7). The surface and near surface soils located at the Site are reported by the Web Soil Survey (USDA, 2018) to be composed of Boggiano clay loam and Cogna loam (Plate 8). 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 (in) Classification mmhos/cm Reaction ability absorption Symbol pH (in/hr) fields Boggiano 0-23: Clay loam; CL <2 6.6 -7.8 0.2 - 0.6 Moderate: clay loam, 23-48: Loam, clay loam, silt <2 7.4 -7.8 0.6 -2.0 flooding, 0-2% loam; CL-ML, CL cemented slopes, 48-60: Cemented; --- --- --- --- pan, peres 110 slowly. Cogna 0-25: Loam; CL-ML, ML <2 6.1 -7.3 0.6 -2.0 Moderate: loam, 0-2% 25-64: Loam, clay loam, silt <2 7.4 - 8.4 0.6 -2.0 flooding, slopes, 129 loam; CL-ML, CL peres slowly. 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 November 19, 2018, Live Oak excavated shallow soil borings on the three proposed parcels parcel of the Site for the purpose of conducting percolation tests. The borings were four inches in diameter, 3.26, 3.30, and 3.33 feet deep, and were excavated by hand auger (Table 2). The locations of the borings are indicated on Plate 9. • LOGE 1845 Page 5