SU0011321 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 ltg/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 8). The surface and near surface soils located at the Site are reported by the Web Soil Survey (USDA, 2017) to be composed primarily of Hollenbeck silty clay, with small areas of Archerdale clay loam, Galt clay, and Vignolo silty clay loam (Plate 9). 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 Archerdale 0-8: Clay loam; CL <2 6.6 - 7.3 0.2 - 0.6 Severe: clay loam, 8-35: Clay loam, clay, silty <2 6.6-7.3 0.06- 0.2 peres slowly 0-2% 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 Galt clay, 0- 0-25: Clay; CL, CH <2 6.6-7.3 0.06-0.2 Severe: 2% slopes, 25-34: Clay, silty clay; CL, CH <2 6.6-8.4 0.06-0.2 cemented 160 34-60: Cemented --- --- --- pan, peres slowly. Hollenbeck 0-10: Silty clay; CH, CL <2 6.6-8.4 0.06-0.2 Severe: silty clay, 0- 10-37: Clay, silty clay; CH, CL <2 6.6-8.4 0.06-02 peres slowly 2% slopes, 37-42: Silty clay loam, clay <2 6.6-8.4 0.2-0.6 173 loam; CL 42-60: Cemented --- --- --- Vignolo silty 0-14: Silty clay loam; CL, ML <2 7.4-7.8 0.2-0.6 Severe: clay loam, 14-30: Clay loam, silty clay <2 7.4-7.8 0.2-0.6 cemented 0-2% loam; CL, ML pan, peres slopes, 30-60: Cemented --- --- --- slowly 271 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. i LOGE 1704 Page 5