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Potential Groundwater Contamination <br /> Currently there are no existing septic disposal systems within the development area of the proposed <br /> parcel. However, County records indicate that adjacent properties have on-site septic systems. Historical <br /> use of the site is agriculture,though no data or records documenting these activities are available. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage for the Project will be from warehouse employee sanitation. Daily <br /> loads are not expected to vary considerably, as water demands (bathrooms, sinks) will be relatively <br /> constant. Diurnal peak flows may be present during break periods,which can be addressed with <br /> equalization. No other wastewater sources are proposed or anticipated. <br /> On-Site Wells <br /> No potable wells are proposed for the Project. The project will be served water through the expansion <br /> of SJ County CSA 31 which serves the development immediately west and south of the proposed project. <br /> Water Samples <br /> Test results from a nearby agricultural well indicate elevated levels of nitrate (11.7 mg/1). 1 The public <br /> water system located adjacent to the Project site requires treatment to remove nitrate. <br /> Section 2 Soil Suitability <br /> Soil Profile and Geologic Information <br /> Natural Resources Conservation Service (NRCS) data for the Project site include soil samples to <br /> approximately 62" bgs.Two (2) soil types were identified,Acompo sandy-loam (101) and Devries sandy- <br /> loam (149). Both descriptions include the presence of a cemented layer starting between 27" and 47" <br /> bgs, and ending between 47" and 60".According to the percolation test data,this cemented layer was <br /> not encountered (see Figure 2). <br /> Soil texture was analyzed by an independent laboratory.The soil sample was taken at the proposed <br /> leach field area from a depth of approximately 24". Soil texture sample test results were consistent with <br /> the NRCS data, defining soil as sandy-loam,with 71%sand, 16%silt, and 13%clay. The laboratory test <br /> results are provided in the attachments. Laboratory test results are shown in Figure 2. <br /> 1 Nitrate results from well water sample collected on May 12,2022.Additional constituents tested included arsenic <br /> (5.1 ug/1), DBCP(ND), hexavalent chromium (0.61 ug/1),and 1,2,3 TCP(ND). <br /> 21 Page <br />