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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Whitlow Property Stockton, CA <br /> November 20, 2019 Terracon Project No. NA197078 <br /> 1.4.3 Water Sample Location <br /> On October 1, 2019, two groundwater samples (GW-1 and GW-2) were collected from a faucet <br /> directly attached to the groundwater well tank. <br /> 1.4.4 Groundwater Sample Analysis <br /> Sample GW-1 was collected into a clean unpreserved plastic 125 milliliter(ml)bottle and analyzed <br /> for nitrate as N by EPA Extraction Method E300.1. Sample GW-2 was collected into two clean <br /> glass 40 ml VOAs preserved with ascorbic and meleic acid and analyzed for DBCP (1,2-Dibromo- <br /> 3-chloropropane) by EPA Extraction Method E524.3. <br /> 1.4.5 Groundwater Sample Handling <br /> The groundwater samples were immediately placed on ice and submitted to McCampbell <br /> Analytical Inc. for analysis. Nitrate as N was reported at 15 mg/L in groundwater sample GW-1 <br /> above the MCL of 10 mg/L-N. Groundwater sample GW-2 reported at 0.016 micrograms per liter <br /> (ug/L)for DBCP which is below the MCL of 0.20 ug/L. <br /> 1.5 Soil Profile and Geologic Information <br /> The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br /> Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- <br /> consolidated alluvium, lake, playa, and terrace deposits. <br /> Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br /> Conversation Service (NRCS) Web Soil Survey for information regarding soil properties. Based <br /> on information obtained from the USDA sources, the site consists of the following soil types. <br /> Table 3. <br /> USDA Soil Types. <br /> Map Symbol Name Percent of Site Location <br /> 160 Galt clay 15.4 Southwest corner <br /> Located across the majority of the <br /> 173 Hollenbeck silty clay 84.6 site with the exception of the <br /> southwest corner. <br /> Based on the USDA soil map, the proposed septic system will be developed within Hollenbeck <br /> silty clay soils. According to the USDA Soil Survey of San Joaquin County (1992), Hollenbeck <br /> silty clay soils consist of moderately well drained soils with 0 to 2 percent slopes. Typical soil <br /> profiles consist of 0 to 37 inches clay, 37 to 42 inches silty clay loam, and 42 to 60 inches <br /> cemented soils. The main limititations for this soil type include high shrink swell potential, slow <br /> permeablity and low strength. For homesites with septic systems, the slow permeability can be <br /> Responsive ■ Resourceful ■ Reliable 8 <br />