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Soil Suitability / Nitrate Loading Study Irerracon <br /> Ernst Property ■ Tracy, CA <br /> February 21, 2019 revised April 9, 2019 ■ Terracon Project No. NA197000 <br /> Boring Depth Interval (feet) Soil Type Unified Soil <br /> Classification <br /> Silty sand with clay, fine <br /> 2.5 to 3.0 to medium grained, SM <br /> brown <br /> 0 to 2.5 Lean clay, fine grained, CL <br /> brown <br /> B2 Silty sand with clay, fine <br /> 2.5 to 3.58 to medium grained, SM <br /> brown <br /> 1.5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow silty sandy soils with clay points to favorable conditions for <br /> shallow septic disposal areas between approximately 3.0 and 3.5 feet bgs. Generally speaking, <br /> coarse-grained soil has a greater potential for percolation than fine-grained or cemented soil. <br /> Terracon searched the Department of Water Resources online Well Completion Records for <br /> additional information regarding soil lithology within 0.5 miles of the site. The following four water <br /> supply wells were identified nearest the site. <br /> WCR Number Latitude Longitude Depth Approximate Distance/Direction <br /> from Site <br /> WCR0181249 37.744965 -121.513773 340 550 feet/Northwest <br /> WCR1985-002634 37.743611 -121.503889 400 2,200 feet/East <br /> WCR2017-007307 37.738056 -121.511667 200 1,650/South <br /> WCR2000-001395 37.743889 -121.515556 455 835 feet/West <br /> Based on a review of the Well Completion records, the soils within the vadose zone (40 to 60 feet <br /> bgs) are comprised of alternating sand and/or clay strata which extends to depths of 455 feet bgs. <br /> Refer to Appendix G for copies of the Well Completion records. <br /> 1.6 Percolation Test Information <br /> 1.6.1 Percolation Test Locations <br /> Refer to Section 1.5.1 and Appendix A, Exhibit 2. <br /> 1.6.2 Number of Percolation Tests <br /> One percolation test (B1) was performed. <br /> Responsive■ Resourceful ■ Reliable 9 <br />