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12430 E.ATKINSON ROAD Project No.2017-00002 Page 16 <br /> on January 27, 2017 by Tonya Scheftner. Each sample was obtained from a spigot attached to the ' <br /> well. Well locations are included in Appendix A,Plate 2. ' <br /> The samples were analyzed for nitrate as nitrogenand DBCP. The sample for nitrate was collected in <br /> a sterile plastic container;the sample for DBCP was collected in two sterile glass vials. The samples <br /> were then transported on ice and released under chain of custody to FGL Environmental,Stockton. <br /> DBCP was not detected in water samples for all three wells(N.Parcel Well at-29,S.Parcel W.Well at <br /> -36 and S. Parcel E. Well at -36). The two groundwater samples collected from each well on the <br /> southern parcel, -36, detected nitrate as nitrogen at 0.9 mg/L; the groundwater sample collected <br /> from the northern parcel,-29, detected nitrate as nitrogen at 1.0 mg/L.Nitrate results are below the <br /> MCL of 10 mg/L set by the United States EPA and California State.The analytical reports prepared by <br /> FGL Environmental are attached in Appendix C. ' <br /> Nitrate in groundwater is attributed to the application of fertilizers,livestock, and untreated septic <br /> tank waste.Nitrate is mobile and often accumulates in the shallow ground water zones.The presence <br /> of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County and other parts <br /> of the Central Valley. <br /> DBCP was not detected in any of the three (3) domestic well water samples.DBCP is a soil fumigant ' <br /> and nematocide used in the past for crops. It is thought to cause health problems consisting of kidney <br /> damage, liver damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental <br /> Protection Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) <br /> because the EPA believes that given present technology and resources, this is the lowest level to <br /> which water systems can reasonably be required to remove this contaminant should it occur in <br /> drinking water. ' <br /> S.0 GEOLOGIC AND SOIL PROFILE INFORMATION t <br /> The Site is depicted on the Preliminary Geologic Map of Cenozoic Deposits of the Bellota Quadrangle <br /> and falls within the Modesto Formation Upper member (Qmzf). Qm2f is a unit of foothill derived ' <br /> alluvial silt, clay, and minor sand forming terraces, upper fans, and following distributaries across <br /> lower fans; abundant volcanic detritus (Plate 6,Appendix A). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil ' <br /> Survey to be composed of Galt clay, and Devries sandy loam, 0-2% slopes (Plate 7, Appendix A) <br /> (USDA, 1992). The table below presents some selected properties of these soils: <br /> Table 3. <br /> San Joaquin County Soil Survey ' <br /> Elected Soil Properties of On-Site Soils <br /> Soil Name Depth Salinity Soil Perme- Septic tank ' <br /> and Map Unified Soil Classification mmhos/ Reaction ability absorption <br /> Symbol (�n) cm pH (in/hr) fields <br /> Devries 0-13: Sandy loam;SM <2 6.6-8.4 2.0-6.0 Severe: ' <br /> sandy 13-28: Sandy loam,fine sandy <2 6.6-8.4 2.0-6.0 cemented <br /> loam, loam; SM pan. <br /> Petalogix Engineemg,Inc <br /> 26675 Bmella Road,Gal,Ca 95632 ' <br /> (209HMS729 <br /> v .Mralogix.mm <br />