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syndrome, which results in reduced oxygen supply to vital tissues. Pregnant women and certain others can also develop methemoglobinemia. Symptoms include a bluish color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. Ingestion of high levels of nitrates over time can also lead to gastric problems. 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 Preliminary Geologic Map of the Lodi 30' x 60' Quadrangle, California (Dawson, 2009). The Site is depicted within a map unit of the Riverbank formation middle unit (Plate 11). The Riverbank formation is described as "arkosic alluvium, sand ... and silt, forming terraces, and alluvial fans along the Consumnes and Mokelumne Rivers." The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of the San Joaquin-Urban Land complex (Plate 12) (USDA, 2019). 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) Class Reaction ability absorption Symbol Classification mmhos/cm pH (in/hr) fields San Joaquin- 0-16 Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: Urban 16-26 Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented Complex, 26-60 Indurated --- --- --- pan, peres 0-2% slopes, slowly 242 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 In January 1995, Armstrong Engineering & Development, LTD. (Armstrong) performed a Soil Suitability Study for a minor subdivision separating the Site from the adjacent land to the east (Appendix 4). As part of the study, Armstrong advanced a soil boring on the Site for the purpose of percolation testing. The boring was 12 inches in diameter and 14 feet deep. The location of the boring is indicated on Plate 13. LOGE 1931 Page 5