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11 Hieb Family 1990 Trust Pree Page 4 of 11 <br /> Our Project Number: E0714.2 <br /> December 17, 2007 <br /> No ground water was encountered by the staff of Neil O. Anderson & Associates, Inc. during <br /> the drilling to a maximum depth of 25 feet on December 13, 2007. <br /> 4,2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for <br /> the soil suitability study. A concurrent Surface and Subsurface Contamination Report by our <br /> ` firm is addressing this issue (NOA, 12/23/07). Please refer to this report for descriptions. <br /> Potential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm <br /> water infiltration. Agricultural activities and the use of septic systems in the area should be <br /> considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location <br /> There is one (1) agricultural well and one (1) domestic well on the site. Two (2) permits were <br /> found during file review at EHD on December 12, 2007. <br /> One water sample was taken on December 12, 2007 by Jessen Welch from the spigot of the on- <br /> site domestic well, near the existing residence. <br /> F1 4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. The analytical reports prepared by FGL (wN� <br /> Fi Environmental are still pending and will be submitted in a separate letter when they are ll <br /> available. (Z.I-- <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin <br /> County and other parts of the Central Valley. Nitrate in ground water occurs as a result of the <br /> application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and <br /> often accumulates in the shallow ground water zones. <br /> In.the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) <br /> 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 /> 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 /> reasonably be required to remove this contaminant should it occur in drinking water. <br /> F] <br /> n902 Industrial Way-Lodi,CA 95240-209.367.3701 -Fax 209.369.4228 ©2007 Neil 0.Anderson&Associates,Inc <br />