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Soil Suitability / Nitrate Loading Study r ierracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> The presence of nitrates is not uncommon in shallow groundwater aquifers in San <br /> Joaquin County and other parts of the Central Valley. Nitrate in groundwater occurs as a <br /> result of the application of fertilizers, livestock waste, and untreated septic tank waste. <br /> Nitrate is mobile and often accumulates in the shallow groundwater zones. <br /> In the early 1900s, natural levels of nitrate in groundwater were measured in forty-three <br /> (43) wells throughout the Sacramento Valley by Kirk Bryan (1923). It was thought that <br /> groundwater at that time was close to "natural" conditions. Based on the work by <br /> Bryan, it is estimated that under "natural" conditions, groundwater concentration <br /> containing nitrate is no more than about 13.5 milligrams per liter (mg/L) nitrate (NO3) <br /> or (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more, are those in which <br /> nitrate concentrations may be increasing (Hull, 1984). <br /> DBCP (dibromo chloropropane) is a nematocide and soil fumigant for vegetables and <br /> grapes. It is thought to cause health problems consisting of kidney damage, liver <br /> damage, and cancer. The use of DBCP was discontinued in 1979. <br /> Based on the historical information, the past agricultural land use in the area should be <br /> considered potential groundwater contamination sources. According to the State Water <br /> Resources Control Board website, there were no nitrate impacted wells reported within <br /> 2,000 feet of the site. <br /> 1.4.3. Water Sample Location <br /> No well located on site. <br /> 1.4.4. Groundwater Sample Analysis <br /> No groundwater was collected on-site. <br /> 1.4.5. Groundwater Sample Handling <br /> No groundwater was collected on-site. <br /> 1.5. Soil Profile and Geologic Information <br /> The site is depicted on the Geologic Map of California website, as within generalized <br /> quaternary Pleistocene and Holocene deposits which are comprised primarily of <br /> unconsolidated and semi-consolidated alluvium, lake, playa, and terrace deposits. <br /> Terracon reviewed the United States Department of Agriculture (USDA) Natural <br /> Resources Conservation Service (NRCS) Web Soil Survey and USDA Soil Survey of San <br /> Joaquin County (1992) for information regarding soil properties. Based on information <br /> obtained from the USDA sources, site soils consist of the following seven soil types. <br /> Facilities I Environmental I Geotechnical I Materials 8 <br />