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Soil Suitability /Nitrate Loading Study Irerracon <br />JPM a Lathrop, Califomia <br />May 24, 2022 ri Terracon Project No. NA227026 <br />Terracon included the below descriptions for Dello loamy sand and Dello clay loam soil types as <br />the proposed septic system(s) will be located in these soil types. Refer to the USDA NRCS <br />Custom Soil Resource Report (Appendix D) and the USDA Soil Survey of San Joaquin County <br />for additional information regarding the remaining soil types associated with the site. <br />Based on a review of the site plan, Dello loamy sand is located on the northern portion of the site <br />and Septic System 1 is anticipated to be located within this soil type. Dello loamy sand consists <br />of drained soils with 0 to 2 percent slopes. Parent material consists of alluvium derived from <br />granitic rock sources. Typical soil profiles consist of 0 to 7 inches loamy sand and 7 to 60 inches <br />sand. <br />Dello clay loam is located on the southern and western portions of the site and consists of 0 to 2 <br />percent slopes. Septic System 2 is proposed to be located in this soil type. Parent material <br />consists of alluvium derived from granitic rock sources. Typical soil profiles consist of 0 to 12 <br />inches clay loam and 12 to 60 inches sand. <br />Permeability is rapid and runoff is slow for both Dello loamy sand and Dello clay loam. The main <br />limitations for both soil types are low available water capacity and the high-water table and <br />perching. The soil is subject to flooding during high precipitation. Irrigation water should be light <br />and frequent. <br />1.5.1 Soil Boring Locations <br />Based on a review of the site plan, the proposed Septic System 1 leach field will be located north <br />of the pond (Exhibit 2). Three percolation test borings B1, B3, and B6 were advanced in the vicinity <br />of the proposed leach fields. <br />Table 5. <br />Soil Boring Information <br />Percolation Test <br />Depth (Feet) <br />Latitude <br />Longitude <br />B1 <br />6.5 <br />37.846732 <br />-121.316546 <br />(Soil profile) <br />B3 <br />3.5 <br />37.846394 <br />-121.316561 <br />135 <br />5.0 <br />37.843144 <br />-121.314713 <br />(Soil profile) <br />136 <br />3.0 <br />37.843137 <br />-121.314576 <br />1.5.2 Soil Boring Dimensions <br />Four borings were advanced using a hand auger with a 4 -inch diameter auger. Refer to Section <br />1.5.1 for boring depths. <br />Responsive ■ Resourceful ■ Reliable 10 <br />