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I Suitability Study Fl Irerracon Flag City#4 Lodi, California February 14, 2019 Terracon Project No. NA187043 4.4 Groundwater Sample Analysis Based on a review of the NLS, two groundwater samples (GW-1 and GW-2) were collected from a tank connected to the onsite groundwater well (Section 4.3)and submitted on ice to McCampbell Analytical Inc. for analysis. Sample GW-1 was collected into a clean unpreserved plastic 125 milliliter (ml) bottle and analyzed for nitrate as N by EPA Extraction Method E300.1. Sample GW- 2 was collected in a clean glass 40 ml amber VOA preserved with ascorbic and meleic acid and analyzed for DBCP (1,2-Dibromo-3-chloropropane) by EPA Extraction Method E524.3. Both groundwater samples GW-1 and GW-2 reported below laboratory reporting limits of 0.10 mg/L for nitrate as N and 0.010 micrograms per liter (ug/L) for DBCP. 4.5 Groundwater Sample Handling Refer to Section 4.4 for further discussion. 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION The site is depicted on the Geologic Map of California 2010, as within generalized quaternary Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- consolidated alluvium, lake, playa, and terrace deposits.. Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources Conversation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County (1992) for information regarding soil properties. Based on information obtained from the USDA sources, site soils consist of two soil types including Acampo sandy loam and Devries sandy loam. Acampo sandy loam Acampo sandy loam soils are located across the majority of 5484 W. Highway 12 (APN 055-160- 23) and consist of 0 to 2 percent slopes. Parent material is alluvium derived from granite. Typical soil profiles consist of 0 to 47 inches sandy loam and 47 to 60 inches cemented soils. Drainage class is considered moderately well drained with low runoff and very low permeability. The USDA Soil Survey of San Joaquin County indicated the main limitation is depth to hardpan. Water may be perched above the hardpan. For sites with septic systems, permeability can be improved by ripping the hardpan layer which improves the suitability of the soil for septic absorption fields. Devries sandy loam Devries sandy loam drained soils are located on the eastern portion of the site primarily comprised of 5198 W. Highway 12 (APN 055-160-25). Parent material consists of coarse loamy alluvium derived from igneous, metamorphic and sedimentary rock. Typical soil profiles consist of 0 to 27 inches sandy loam, 27 to 47 inches cemented sandy loam, and 47 to 62 inches sandy loam. The soils are somewhat poorly drained with very low runoff and very low to moderately low permeability. Water may be perched above the hardpan. For sites with septic systems, Responsive ® Resourceful ® Reliable 8