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Soil Suitability /Nitrate Loading Study Irerracon <br />JPM o Lathrop, California <br />May 24, 2022 a Terracon Project No. NA227026 <br />the west side of the residence located at the pond. The water faucets were allowed to run for <br />approximately 5 minutes. <br />1.4.4 Groundwater Sample Analysis <br />Groundwater samples were collected into a clean unpreserved plastic 125 milliliter (ml) bottle and <br />analyzed for nitrate as N by EPA Extraction Method E300.1. An additional groundwater sample <br />was collected into two clean glass 40 ml VOAs preserved with ascorbic and maleic acid and <br />analyzed for DBCP (1,2-Dibromo-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 below laboratory reporting limits of 0.20 <br />milligrams per liter (mg/L) in both groundwater samples GW -1 and GW -2, below the Maximum <br />Contaminant Level (MCL) of 10 mg/L-N. DBCP was reported below laboratory reporting limits of <br />0.010 micrograms per liter (Ng/L) in both groundwater samples GW -1 and GW -2, below the MCL <br />of 0.2 pg/L. <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California website, 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 />Conservation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County <br />(1992) for information regarding soil properties. Based on information obtained from the USDA <br />sources, site soils consist of the following seven soil types. <br />130 - Columbia fine sandy loam, drained, 0 to 2 percent slopes, MLRA 17 <br />144 - Dello sand, partially drained, 0 to 2 percent slopes, occasionally flooded <br />145 - Dello loamy sand, drained, 0 to 2 percent slopes. <br />148 - Dello clay loam, drained, 0 to 2 percent slopes, overwashed. <br />153 - Egbert silty clay loam, partially drained, 0 to 2 percent slopes, MLRA 16 <br />167 - Grangeville clay loam, partially drained, 0 to 2 percent slopes <br />261 - Valdez silt loam, organic substratum, partially drained, 0 to 2 percent slopes, MLRA 16 <br />Responsive ■ Resourceful ■ Reliable 9 <br />