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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Souza Property Tracy, CA <br /> February 28, 2020 Terracon Project No. NA207011 <br /> DBCP (dibromo chloropropane) is a nematocide and soil fumigant for vegetables and grapes. It <br /> is thought to cause health problems consisting of kidney damage, liver damage, and cancer. The <br /> use of DBCP was discontinued in 1979. <br /> Based on the historical information, the past agricultural land use, former onsite septic system, <br /> and septic systems in the area should be considered potential groundwater contamination <br /> sources. According to the State Water Resources Control Board website, there were no nitrate <br /> impacted wells reported within 2,000 feet of the site. <br /> 1.4.3 Water Sample Location <br /> A domestic groundwater well is not currently located on the site. <br /> 1.4.4 Groundwater Sample Analysis <br /> No samples were collected. <br /> 1.4.5 Groundwater Sample Handling <br /> No samples were analyzed. <br /> 1.5 Soil Profile and Geologic Information <br /> The site is depicted on the Geologic Map of California 2010.0, as within generalized quaternary <br /> Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- <br /> consolidated alluvium, lake, playa, and terrace deposits. <br /> Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br /> Conversation Service (NRCS) Web Soil Survey for information regarding soil properties. Based <br /> on information obtained from the USDA sources, the site consists of the following soil types. <br /> Table 5. <br /> USDA Soil Types. <br /> Map Symbol Name Percent of Site Location <br /> 252 Stomar clay loam 10.00% All of site <br /> Stomar clay loam soils consist of well drained soils with 0 to 2 percent slopes. Parent material <br /> consists of alluvium derived from sedimentary rock. Typical soil profiles consist of 0 to 17 inches <br /> clay loam, 17 to 47 inches clay loam and clay, and 47 to 60 inches clay loam and silty clay loam. <br /> According to the USDA Soil Survey of San Joaquin County (1992), Stomar clay loam soils are <br /> very deep. For septic system development, the main limitation of this soil type is slow percolation <br /> rates. <br /> Responsive■ Resourceful ■ Reliable 8 <br />