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Soil Suitability /Nitrate Loading Study 1rerracon <br />Munsch Property ■ Lodi, California <br />January 7, 2022 ■ Terracon Project No. NA217092 <br />of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and often <br />accumulates in the shallow groundwater zones. <br />In the early 1900s, natural levels of nitrate in groundwater were measured in forty-three (43) wells <br />throughout the Sacramento Valley by Kirk Bryan (1923). It was thought that groundwater at that <br />time was close to "natural" conditions. Based on the work by Bryan, it is estimated that under <br />"natural" conditions, groundwater concentration containing nitrate is no more than about 13.5 <br />milligrams per liter (mg/L) nitrate (NO3) or (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L- <br />N) or more, are those in which nitrate concentrations may be increasing (Hull, 1984). <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 and septic systems in the area <br />should be considered potential groundwater contamination sources. According to the State Water <br />Resources Control Board website, there were no nitrate impacted wells reported within 2,000 feet <br />of the site. <br />1.4.3 Water Sample Location <br />No groundwater was collected as a groundwater well was not currently located on the site. <br />1.4.4 Groundwater Sample Analysis <br />No groundwater sample were collected. <br />1.4.5 Groundwater Sample Handling <br />No groundwater was sampled. <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California website, 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 />Conservation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County <br />(1992) for information regarding soil properties. Based on information obtained from the USDA <br />sources, site soils consist of Tokay fine sandy loam which consist of well drained soils and nearly <br />Responsive ■ Resourceful ■ Reliable 8 <br />