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F1 Kooyman Property <br /> Our Project Number: E07197B Page 5 of 10 <br /> November 26,2007 <br /> Fi <br /> In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) <br /> k wells throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at <br /> that time was close to "natural" conditions. Based on the work by Bryan, it is estimated that <br /> under"natural"conditions, ground water concentration containing nitrate is no more then about <br /> 13.5 mg/L-NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in <br /> which nitrate concentrations may be increasing (Hull, 1984). <br /> DBCP is a nematocide and soil fumigant for vegetables and grapes. It is thought to cause <br /> t health problems consisting of kidney damage, liver damage, and cancer. The use of DBCP was <br /> discontinued in 1979. The Environmental Protection Agency (EPA) set the maximum <br /> contaminant limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes that given <br /> present technology and resources, this is the lowest level to which water systems can <br /> freasonably be required to remove this contaminant should it occur in drinking water. <br /> 4.5 Well Water Sample Collection, Handling, and Transportation <br /> The sample for nitrate was collected in a clean plastic container; the sample for DBCP was <br /> collected in two clean glass vials. The samples were then transported on ice and remanded <br /> under chain of custody to FGL Environmental, Stockton. <br /> Fj 4,6 Chain of Custody <br /> The Chain of Custody document has been included in the appendix of this report. <br /> F! 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> 0 The site is depicted on the USGS Preliminary Geologic Map as Quaternary Modesto Formation <br /> (lower member). This formation is classified as an arkosic alluvium, which forms Mokelumne <br /> River terraces and alluvial fans. It is considered to be chiefly composed of sand and probably <br /> glacial outwash (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County <br /> Soil Survey to be composed of Acampo sandy loam, with 0 to 2 percent slopes (Plate 8) (USDA, <br /> - 1992). The table below presents some selected properties of these soils: <br /> Fi Table 1. <br /> San Joaquin County Soil Survey <br /> Selected Soil Proerties of On-Site Soils. <br /> soil Name Depth Unified Soil classification Salinity Soil Perme- Septic tank <br /> 1 and Map (in) (mmhos/cm) Reaction ability absorption <br /> Symbol <br /> PH (in/hr) fields <br /> Acampo 0-19: Sandy loam; SM <2 6.1-7.8 2.0-6.0 Moderate: <br /> sandy loam, 19-47: Sandy loam, fine sandy loam; <2 6.6-8.4 2.0-6.0 cemented <br /> 0-2% coarse sandy loam SM pan. <br /> slopes, 101 47-49: Indurated ___ __- ___ <br /> 49-60 Cemented <br /> F! 902 Industrial Way-Lodi,CA 95240-209.367.3701 -Fax 209.369.4228 02007 Neil O.Anderson&Associates,Inc Y <br />