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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Manteca Farm Improvement Manteca, California <br /> October 29, 2019 Terracon Project No. NA197073 <br /> agricultural land use and the existing and/or former septic systems on the site should be <br /> considered potential groundwater contamination sources. <br /> 1.4.3 Water Sample Location <br /> A groundwater sample was collected from a faucet connected to the private well located adjacent <br /> west of the classroom building (5298 E. Brunswick Road) and submitted on ice to McCampbell <br /> Analytical Inc. for analysis. Sample GW-1 was collected into a clean unpreserved plastic 125 <br /> milliliter(ml) bottle and analyzed for nitrate as N by EPA Extraction Method E300.1. Sample GW- <br /> 2 was collected into two clean glass 40 ml VOAs preserved with ascorbic and meleic acid and <br /> analyzed for DBCP (1,2-Dibromo-3-chloropropane) by EPA Extraction Method E524.3. Nitrate as <br /> N was reported at 32 mg/L in groundwater sample GW-1 above the MCL of 10 mg/L-N or 140 <br /> mg/L nitrate above the MCL of 45 mg/L nitrate. Groundwater sample GW-2 reported below <br /> laboratory reporting limits of 0.010 micrograms per liter(ug/L)for DBCP. <br /> 1.4.4 Groundwater Sample Analysis <br /> Refer to Section 1.4.3. <br /> 1.4.5 Groundwater Sample Handling <br /> Refer to Section 1.4.3. <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 4. <br /> USDA Soil Types. <br /> Map Symbol Map Unit Name Percent of Site Location <br /> Delhi fine sand, 0 to 5 Across the majority of the and <br /> 141 percent slopes 95 location of the proposed septic <br /> system. <br /> Tinnin loamy coarse <br /> 255 sand, 0 to 2 percent 4.0 Northeast corner <br /> slopes <br /> Responsive■ Resourceful ■ Reliable 9 <br />