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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 pg/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 /> The laboratory analytical results are attached as Appendix 5 of this report. <br /> Soil Profile-and Geologic Information <br /> The Site can be found on the Preliminary geologic map of Cenozoic deposits of the Clay <br /> area, California (Bartow and Marchand, 1979). It is depicted within map units of the <br /> Modesto Formation upper member, the Riverbank Formation middle member, and the <br /> Laguna Formation (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 Bruella, Corning, Redding, Coyotecreek, Hicksville, San <br /> Joaquin, and Yellowlark soils (Plate 9) (USDA, 2014). The table below presents some <br /> selected properties of these soils: <br /> Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br /> Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map (in) Classification mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Bruella 0-18: Sandy loam; SC-SM, <2 6.1 - 7.3 2.0 - 6.0 Severe: <br /> sandy loam, SM peres slowly <br /> 0-2 % 18-31: Sandy clay loam, sandy <2 6.1 - 7.3 0.2 - 0.6 <br /> slopes, 111 loam; SC <br /> 31-67: Sandy clay loam, clay <2 6.1 - 7.3 0.2 - 0.6 <br /> loam; SC, CL <br /> Bruella 0-8: Sandy loam; SC-SM, <2 6.1 - 7.3 2.0 -6.0 Severe: <br /> sandy loam, SM peres slowly <br /> hard 8-42: Sandy loam, sandy clay <2 6.1 - 7.3 0.2 - 0.6 <br /> substratum, loam; SC <br /> 0-2 % 42-60: Sandy clay loam, sandy <2 6.1 - 7.3 0.06 - 0.2 <br /> slopes, 112 clay, SC <br /> LOGE 1419 Page 5 <br />